- Double Stars -

And (17) Cep (13) Cyg (18) Leo (11) Peg (9) UMa (5)
Aql (9) CMa (1) Del (2) LMi (4) Per (4) UMi (1)
Ari (5) Cnc (2) Dra (8) Lyn (9) Psc (1) Vir (6)
Aur (15) Com (1) Equ (5) Lyr (8) Ser (3)
Boo (8) CrB (4) Eri (1) Mon (1) Sex (1)
Cam (2) Crv (1) Gem (9) Oph (1) Tau (6)
Cas (17) CVn (2) Her (12) Ori (8) Tri (3)

1 Ari (**)

Name: 1 Ari, STF174
Type: **
Constellation: Ari
Coordinates: 01h50m08.60s / +22°16'29.50"

Components:
m1 m2 ρ θ Year
6.3 7.2 2.9" 165° 2018
63mm f/13.3, 46x, Bortle 6-, SQM-L 19.0
Clearly split, but tight with noticeable difference in brightness.

70mm f/5.7, 100x, Bortle 6-
Very nice view. Both Well split, relatively tight with noticeable difference in brightness.

8" f/6, 100x, Bortle 4, NELM 5.9+, SQM-L 21.0
SQM-L 20.8: Nice double star with big difference in brightness.

15 Aql (**)

Name: 15 Aql, SHJ286
Type: **
Constellation: Aql
Coordinates: 19h04m57.67s / -04°01'53.10"

Components:
m1 m2 ρ θ Year
5.5 7.0 39.6" 211° 2018
70mm f/5.7, 22x
Striking, pretty wide, uneven pair. Primary component gleamed in shiny orange, the companion appeared slightly orange.

8" f/6, 37x, Bortle 5-, SQM-L 20.4
SQM-L 19.9: Easy to split, evident. Both components appeared slightly orange colored.

16/17 Dra (**)

Name: 16/17 Dra
Type: **
Constellation: Dra
Coordinates: 16h36m13.72s / +52°55'27.80"

Components:
m1 m2 ρ θ Year
STFA30, 16/17 Dra AC 5.4 5.5 90.0" 193° 2017
STF2078, 17 Dra AB 5.4 6.4 3.3" 104° 2018
55mm f/9.1, 27x
STFA30 (AC): Rather wide pair with almost equal components. C component appeared slightly yellowish-orange.

55mm f/9.1, 71x
STF2078 (AB): Grand sight!

../sketches/2019-05-18_16_17_dra.jpg

41 Lyn (**)

Name: 41 Lyn, S598
Type: **
Constellation: UMa
Coordinates: 09h28m39.99s / +45°36'06.50"

Components:
m1 m2 ρ θ Year
AB 5.5 7.8 69.7" 160° 2017
This star has the designation 41 Lyn but is assigned to UMa. At the time, when Flamsteed numbered the stars, the constellation boundaries were not exactly defined. Another example is 10 UMa, which is located in Lyn today.

B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.2
Fairly well split with fainter component.

52 Her (**)

Name: 52 Her
Type: **
Constellation: Her
Coordinates: 16h49m14.20s / +45°59'00.40"

Components:
m1 m2 ρ θ Year
A1866 BC 9.5 9.6 0.3" 266° 2012
BU627 A-BC 4.8 8.4 2.1" 43° 2017
102mm f/11, 280x, Bortle 6
BU627 (A-BC): At 160x the faint component is already beginning to be visible as brightening in the first diffraction ring. At 280x the brightening is quite clearly visible and appears partly clear as a small knot in the first diffraction ring.

59 And (**)

Name: 59 And, STF222
Type: **
Constellation: And
Coordinates: 02h10m52.83s / +39°02'22.40"

Components:
m1 m2 ρ θ Year
6.0 6.7 16.6" 37° 2018
B 40mm, 8x, Bortle 7, SQM-L 19.0
Separated, but very tight. I used a tripod.

120mm f/5, 18x, Bortle 6, SQM-L 19.3
Well split with noticeable difference in brightness.

8" f/6, 100x, Bortle 4, NELM 6.0, SQM-L 20.9
SQM-L 20.4: Nice and evident double star, easy to split. About 12 arcminutes NE there is NGC828 (v12.3m),

70 Oph (**)

Name: 70 Oph, P Oph, STF2272
Type: **
Constellation: Oph
Coordinates: 18h05m27.37s / +02°29'59.30"

Components:
m1 m2 ρ θ Year
AB 4.2 6.2 6.4" 124° 2017
8" f/6, 80x, Bortle 5, SQM-L 20.7
SQM-L 20.1: Well split at 80x. Brighter component appeared white, fainter one slightly orange.

164 And (**)

Name: 164 And, STF79
Type: **
Constellation: And
Coordinates: 01h00m03.56s / +44°42'47.70"

Components:
m1 m2 ρ θ Year
6.0 6.8 7.9" 195° 2018
55mm f/9.1, 25x, Bortle 7, SQM-L 19.0
Beautiful double star, relatively tight with visible difference in brightness.

beta Cyg (**)

Name: beta Cyg, 6 Cyg, Albireo, STFA43
Type: **
Constellation: Cyg
Coordinates: 19h30m43.29s / +27°57'34.90"

Components:
m1 m2 ρ θ Year
AB 3.2 4.7 34.7" 55° 2018
B 40mm, 8x, Bortle 5, NELM 5.5
Well split, but I didn't recognised any color.

80mm f/6.25, 25x
One of the most beautiful double stars in the northern hemisphere. Differences in brightness and color (orange-blue) are brilliant! Even under urban conditions with small aperture an enjoyment!

beta Lyr (**)

Name: beta Lyr, 10 Lyr
Type: **
Constellation: Lyr
Coordinates: 18h50m04.79s / +33°21'45.60"

Components:
m1 m2 ρ θ Year
STFA39 AB 3.6 6.7 45.7" 149° 2017
BU293 AE 3.6 10.1 67.2" 317° 2015
BU293 AF 3.6 10.6 86.0" 18° 2015
70mm f/5.7, 22x
At 22x and 57x the components A, B, E and F were easily seen. The B component appeared slightly bluish-silver at 22x, but at 57x the color was difficult to tell. All four components form a slightly curved 'Y' with the bright A component in the center.

102mm f/11, 62x, Bortle 6
Components A, B, E and F are easily visible. The two southern stars on the drawing do not belong to the system.

../sketches/2019-06-23_beta_lyr.jpg

BU1 (**)

Name: BU1
Type: **
Constellation: Cas
Coordinates: 00h52m49.22s / +56°37'39.50"

Components:
m1 m2 ρ θ Year
AC 8.6 8.9 3.9" 134° 2017
AD 8.6 9.7 9.0" 194° 2017
70mm f/5.7, 57x, Bortle 7
AC: Easy to split with little difference in brightness.

70mm f/5.7, 57x, Bortle 7
AD: Relatively large angular distance with obviously fainter component.

BU32 (**)

Name: BU32, 6 Ser
Type: **
Constellation: Ser
Coordinates: 15h21m02.00s / +00°42'55.20"

Components:
m1 m2 ρ θ Year
AB 5.5 8.8 3.4" 22° 2008
102mm f/11, 224x
Not split. Tried at 224x and 280x. Companion probably too faint. I had sidewalk lighting in the immediate vicinity.

BU67 (**)

Name: BU67
Type: **
Constellation: Cyg
Coordinates: 20h50m36.05s / +30°54'45.70"

Components:
m1 m2 ρ θ Year
6.8 9.9 1.5" 310° 2015
152mm f/5.9, 270x, Bortle 6
Not split.

BU130 (**)

Name: BU130, 90 Her
Type: **
Constellation: Her
Coordinates: 17h53m18.03s / +40°00'28.60"

Components:
m1 m2 ρ θ Year
5.3 8.8 1.6" 110° 2009
120mm f/5, 300x, Bortle 6
Not split at 200x and 300x. I used a 120/600mm achromat.

BU167 (**)

Name: BU167
Type: **
Constellation: Cyg
Coordinates: 21h36m13.98s / +30°03'19.50"

Components:
m1 m2 ρ θ Year
6.4 9.9 1.7" 88° 2005
152mm f/5.9, 360x, Bortle 6-
The much fainter component was only occasionally visible as a clear brightening of the first diffraction ring. The diffraction ring itself was only indicated and not visible all around. Difficult.

BU483 (**)

Name: BU483
Type: **
Constellation: And
Coordinates: 00h09m03.67s / +40°50'34.30"

Components:
m1 m2 ρ θ Year
AC 7.0 7.7 158.5" 268° 2015
B 40mm, 8x, Bortle 7, SQM-L 19.0
Large distance with significant difference in brightness.

CSN12 (**)

Name: CSN12
Type: **
Constellation: Aql
Coordinates: 19h16m55.23s / +05°10'07.10"

Components:
m1 m2 ρ θ Year
AN 4.7 5.8 9.1" 285° 2000
70mm f/5.7, 22x
2019-07-03: Absolutely no star with the given magnitude visible at this position. An error in the WDS or is this a variable one?

delta Cep (**)

Name: delta Cep, STFA58
Type: **
Constellation: Cep
Coordinates: 22h29m10.25s / +58°24'54.70"

Components:
m1 m2 ρ θ Year
AC 4.2 6.1 40.7" 192° 2018
55mm f/9.1, 27x, Bortle 6
At 27x easy to separate, rather wide apart with clear difference in brightness. At 38x the colors are slightly better visible: A shines in bright orange, B appears rather gray-blueish.

80mm f/6.25, 25x
Obvious difference in brightness and color. Brighter component slightly orange, weaker bluish. Could be Albireo's little brother ;)

EHR16 (**)

Name: EHR16, lambda Aql, 16 Aql
Type: **
Constellation: Aql
Coordinates: 19h06m14.95s / -04°52'56.40"

Components:
m1 m2 ρ θ Year
AB 3.5 7.5 12.5" 30° 2009
70mm f/5.7, 133x
2019-07-03: The faint B component could not be seen for sure.

epsilon Lyr (**)

Name: epsilon Lyr
Type: **
Constellation: Lyr
Coordinates: 18h44m20.34s / +39°40'12.40"

Components:
m1 m2 ρ θ Year
STFA37 AB-CD 4.7 4.6 209.5" 172° 2016
STFA37 AI 5.2 10.1 149.5" 137° 2015
STF2382, 4 Lyr, epsilon 1 Lyr AB 5.2 6.1 2.2" 346° 2018
STF2383, 5 Lyr, epsilon 2 Lyr CD 5.2 5.4 2.4" 76° 2018
55mm f/9.1, 59x
STF2382 (AB): At 42x slightly elongated, at 59x elongated and obviously notched.

55mm f/9.1, 59x
STF2383 (CD): At 42x clearly elongated, but without any visible notch. At 59x split with touching diffraction disks.

70mm f/5.7, 57x
STF2382 (AB): Obviously seen as figure '8'.

70mm f/5.7, 57x
STF2383 (CD): Split, but extremely tight with almost touching diffraction disks.

102mm f/11, 125x, Bortle 6, SQM-L 19.4
Stunning view of the components A-D and I!

../sketches/2019-06-26_epsilon_lyr.jpg

ES4 (**)

Name: ES4
Type: **
Constellation: And
Coordinates: 01h31m05.02s / +43°37'14.60"

Components:
m1 m2 ρ θ Year
8.1 9.1 2.8" 101° 2016
70mm f/5.7, 128x
Not split. I probably didn't recognised the fainter component. The angular distance shouldn't be a problem.

eta Cas (**)

Name: eta Cas, 24 Cas
Type: **
Constellation: Cas
Coordinates: 00h49m06.29s / +57°48'54.70"

Components:
m1 m2 ρ θ Year
STF60 AB 3.5 7.4 13.4" 325° 2016
STF60 AC 3.5 11.4 225.0" 260° 2000
STF60 AD 3.5 12.8 189.4" 354° 2011
STF60 AE 3.5 10.2 75.6" 126° 2015
STF60 AF 3.5 11.5 378.3" 276° 2000
STF60 AG 3.5 9.5 419.7" 259° 2012
STF60 AH 3.5 8.4 701.1" 355° 2012
SMR2 AI 3.5 11.6 90.3" 73° 2012
SMR2 AJ 3.5 12.3 237.1" 262° 2012
70mm f/5.7, 57x
AB: Easy to split with big difference in brightness. Fainter component appeared deep orange to slightly red colored, brighter component tends to be more slightly yellowish.

gamma Ari (**)

Name: gamma Ari, STF180
Type: **
Constellation: Ari
Coordinates: 01h53m31.76s / +19°17'38.60"

Components:
m1 m2 ρ θ Year
AB 4.5 4.6 7.4" 2018
8" f/6, 80x, Bortle 3-, SQM-L 21.3
Nice, obvious double star. Both components have similar brightness and appeared white.

gamma Her (**)

Name: gamma Her, 20 Her
Type: **
Constellation: Her
Coordinates: 16h21m55.24s / +19°09'10.90"

Components:
m1 m2 ρ θ Year
DRS58 AD 2.9 8.1 8.3" 176° 2010
SHJ227 AB 3.8 10.1 43.3" 226° 2013
SHJ227 BC 10.1 13.3 82.0" 298° 2015
102mm f/11, 280x, Bortle 6, SQM-L 19.4
AD: It is already the second attempt at this double star. There was nothing perceptible at the best of intentions, which indicates a double star.

H1 48 (**)

Name: H1 48
Type: **
Constellation: Cep
Coordinates: 21h13m42.46s / +64°24'15.10"

Components:
m1 m2 ρ θ Year
7.2 7.3 0.7" 244° 2018
152mm f/5.9, 270x, Bortle 6-
Clearly elongated, of equal brightness with partly visible, slight constriction.

H5 12 (**)

Name: H5 12, 9 Ari, lambda Ari
Type: **
Constellation: Ari
Coordinates: 01h57m55.71s / +23°35'45.80"

Components:
m1 m2 ρ θ Year
AB 4.8 6.7 37.3" 48° 2018
70mm f/5.7, 15x, Bortle 6-
Easy to split with large distance and difference in brightness.

H5 82 (**)

Name: H5 82
Type: **
Constellation: Cas
Coordinates: 00h47m24.62s / +51°05'45.90"

Components:
m1 m2 ρ θ Year
AB 8.0 8.3 57.2" 75° 2017
70mm f/5.7, 26x, Bortle 7
Almost equally bright components with large angular distance.

HJ3945 (**)

Name: HJ3945
Type: **
Constellation: CMa
Coordinates: 07h16m36.84s / -23°18'56.10"

Components:
m1 m2 ρ θ Year
AB 5.0 5.8 26.8" 50° 2015
120mm f/5, 23x
Evident, easy to split at large angular distance. Brighter component appeared very orange, fainter one bluish.

IC5006 (**)

../dss/dss2red_202347.00_+062655.00_5_web.jpg
Image source: DSS II (red) - 5×5'
Name: IC5006
Type: **
Constellation: Aql
Coordinates: 20h23m47.00s / +06°26'55.00"

Components:
m1 m2 ρ θ Year
14.5 15.1 6.0" 210.0° -
8" f/6, 150x, Bortle 4, NELM 5.7+, SQM-L 20.9
NELM 5.4+, SQM-L 20.6: I saw this 'double star' with averted vision just as a faint, stellar brightening.
MODERATE

KR11 (**)

Name: KR11
Type: **
Constellation: Cas
Coordinates: 01h19m40.95s / +61°34'44.40"

Components:
m1 m2 ρ θ Year
9.6 9.7 2.0" 59° 2017
152mm f/5.9, 129x
Rather faint double star. Easily split with equally bright components.

KR60 (**)

Name: KR60, DO Cep, Kruger 60
Type: **
Constellation: Cep
Coordinates: 22h27m59.20s / +57°41'43.80"

Components:
m1 m2 ρ θ Year
AB 9.9 11.4 1.5" 266° 2016
A detailed article about Kruger 60 was published in the "Journal of Double Star Observations" by Wilfried R.A. Knapp and John Nanson. Another article is about the origin of the comet 2I/Borisov (C/2019 Q4) in connection with Kruger 60.

152mm f/5.9, 150x, Bortle 6-
Observed at magnifications between 129x and 300x. The seeing and transparency (Bortle 6-) were only average. The rather faint B component seemed to appear in few moments.

LEP103 (**)

Name: LEP103
Type: **
Constellation: Cep
Coordinates: 21h54m14.50s / +66°43'54.20"

Components:
m1 m2 ρ θ Year
7.2 8.0 4.1" 213° 2000
152mm f/5.9, 100x, Bortle 4, SQM-L 21.0
The brightness of this double star does not match the data in the WDS. I also couldn't separate anything here. A mistake in the WDS?

mu Boo (**)

Name: mu Boo
Type: **
Constellation: Boo
Coordinates: 15h24m29.54s / +37°22'37.10"

Components:
m1 m2 ρ θ Year
STFA28, mu 1 Boo, 51 Boo AB 4.3 7.1 108.2" 171° 2017
STF1938, mu 2 Boo Ba-Bb 7.1 7.6 2.2" 2017
B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.2
STFA28 (AB): Easily split with obvious difference in brightness.

70mm f/5.7, 22x, Bortle 6, SQM-L 19.2
STFA28 (AB): Evident, very wide apart and unequal. A: white-yellowish, B: gray.

102mm f/11, 125x, Bortle 6-, SQM-L 19.2
STF1938 (Ba-Bb): Beautiful view! This triple system includes STFA 28 and STF 1938.

../sketches/2019-04-04_mu_boo.jpg

120mm f/5, 23x, Bortle 6, NELM 5.0+, SQM-L 19.4
STFA28 (AB): Easy to split with large angular distance and noticeable difference in brightness.

mu Cyg (**)

Name: mu Cyg, 78 Cyg, STF2822
Type: **
Constellation: Cyg
Coordinates: 21h44m08.57s / +28°44'33.40"

Components:
m1 m2 ρ θ Year
AB 4.8 6.2 1.6" 321° 2018
70mm f/5.7, 128x
At 128x I was able to see this double at least elongated.

8" f/6, 171x, Bortle 5, NELM 5.7, SQM-L 20.6
Quite well split with noticeable fainter component.

mu Dra (**)

Name: mu Dra, 21 Dra, Alrakis, Arrakis
Type: **
Constellation: Dra
Coordinates: 17h05m20.20s / +54°28'14.30"

Components:
m1 m2 ρ θ Year
STF2130 AB 5.7 5.7 2.6" 2018
BU1088 AC 5.7 13.7 12.6" 175° 2006
102mm f/11, 125x, Bortle 6
AB: Easy to separate. Beautiful sight. Components equally bright with no discernible color difference.

mu Her (**)

Name: mu Her, 86 Her
Type: **
Constellation: Her
Coordinates: 17h46m27.51s / +27°43'14.30"

Components:
m1 m2 ρ θ Year
A-BC 3.5 9.8 35.5" 249° 2015
120mm f/5, 86x, Bortle 6
A-BC: Easy, pretty wide, unequal pair. A appeared yellowish-orange, BC was barely visible with direct vision.

NGC6933 (**)

../dss/dss2blue_203338.50_+072325.00_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC6933
Type: **
Constellation: Del
Coordinates: 20h33m38.50s / +07°23'25.00"

Components:
m1 m2 ρ θ Year
10.8 12.5 30.0" 215.0° -
I guess it is just an optical double star. At least I could not find any entry in the 'Washington Double Star Catalog' (WDS). Located west of the globular cluster NGC6935 in an angular distance of less than 10 arcminutes.

8" f/6, 80x, Bortle 4, NELM 5.7+, SQM-L 20.9
NELM 5.4+, SQM-L 20.6: Easily split, but rather unspectacular. Just for completeness ;-)
EASY

SHJ145 (**)

Name: SHJ145, delta Crv, 7 Crv, Algorab
Type: **
Constellation: Crv
Coordinates: 12h29m51.86s / -16°30'55.60"

Components:
m1 m2 ρ θ Year
AB 3.0 8.5 24.0" 215° 2015
70mm f/5.7, 47x, Bortle 6, SQM-L 19.5
Large difference in brightness and pretty wide apart. Primary component appeared white-bluish. The B component was too faint for seeing colors.

SHJ146 (**)

Name: SHJ146
Type: **
Constellation: Vir
Coordinates: 12h31m14.61s / +01°19'37.00"

Components:
m1 m2 ρ θ Year
AB 7.7 8.7 49.5" 290° 2017
70mm f/5.7, 33x, Bortle 6, SQM-L 19.5
Visible difference in brightness and color. I couldn't precisely define the colors itself, but A appeared rather orange, B rather bluish.

102mm f/11, 28x
Pretty wide pair with visible difference in brightness and lovely color contrast. A: pale orange, B: light blue.

SHJ282 (**)

Name: SHJ282
Type: **
Constellation: Lyr
Coordinates: 18h54m52.52s / +33°58'06.90"

Components:
m1 m2 ρ θ Year
AC 6.1 7.6 45.4" 350° 2018
70mm f/5.7, 22x, Bortle 6-, SQM-L 19.2
Fairly bright and wide pair. The double star was conspicuous, especially in regard to its color: A appeared orange, C rather gray-bluish. It could be observed together with Messier 57 and beta & gamma Lyrae. Very nice.

sigma CrB (**)

Name: sigma CrB, 17 CrB, STF2032
Type: **
Constellation: CrB
Coordinates: 16h14m40.85s / +33°51'31.00"

Components:
m1 m2 ρ θ Year
AB 5.6 6.5 7.3" 239° 2018
70mm f/5.7, 22x, Bortle 4, SQM-L 20.9
At 22x clearly separated, but very close with a clear difference in brightness. At 57x easy without any noticeable difference in color.

SIN128 (**)

Name: SIN128
Type: **
Constellation: Aur
Coordinates: 06h01m14.73s / +31°32'28.10"

Components:
m1 m2 ρ θ Year
AC 7.3 7.6 2.6" 193° 1985
70mm f/5.7, 133x
Even at high magnification there are no indications of a double star. Also the brightness seemed to be less than stated!?

STF7 (**)

Name: STF7
Type: **
Constellation: Cas
Coordinates: 00h11m38.91s / +55°57'40.90"

Components:
m1 m2 ρ θ Year
8.0 8.5 1.3" 210° 2017
152mm f/5.9, 210x
Clearly separated with rather close components. Slightly unequal. Pretty double.

STF24 (**)

Name: STF24
Type: **
Constellation: And
Coordinates: 00h18m30.59s / +26°08'25.10"

Components:
m1 m2 ρ θ Year
7.8 8.4 5.1" 247° 2017
70mm f/5.7, 66x, Bortle 6-
Well split with visible difference in brightness.

STF33 (**)

Name: STF33
Type: **
Constellation: And
Coordinates: 00h30m58.47s / +34°05'53.90"

Components:
m1 m2 ρ θ Year
8.8 8.9 2.8" 213° 2017
70mm f/5.7, 128x, Bortle 4-, SQM-L 20.9
Components equally bright, easy to split.

STF48 (**)

Name: STF48
Type: **
Constellation: Cas
Coordinates: 00h42m40.01s / +71°21'57.30"

Components:
m1 m2 ρ θ Year
AB 7.8 8.1 5.5" 334° 2016
70mm f/5.7, 57x, Bortle 6-
At 22x almost split, clearly elongated with constriction. At 31x split, but very close together, almost equally bright. At 57x easily separable with very small difference in brightness. The fainter companion appeared slightly orange.

STF55 (**)

Name: STF55
Type: **
Constellation: And
Coordinates: 00h44m22.95s / +33°37'05.60"

Components:
m1 m2 ρ θ Year
8.3 8.9 2.3" 331° 2016
70mm f/5.7, 128x, Bortle 7+, SQM-L 18.8
Well split with noticeable difference in brightness.

STF59 (**)

Name: STF59
Type: **
Constellation: Cas
Coordinates: 00h47m59.03s / +51°26'41.20"

Components:
m1 m2 ρ θ Year
AB 7.2 8.1 2.3" 148° 2016
70mm f/5.7, 100x, Bortle 7
At 57x elongated, at 100x barely, at 128x clearly split with noticeable difference in brightness.

STF65 (**)

Name: STF65
Type: **
Constellation: Cas
Coordinates: 00h52m45.61s / +68°51'59.30"

Components:
m1 m2 ρ θ Year
8.0 8.0 3.2" 220° 2017
70mm f/5.7, 57x, Bortle 7
Clearly split with equally bright components.

STF72 (**)

Name: STF72
Type: **
Constellation: And
Coordinates: 00h54m37.50s / +39°10'09.70"

Components:
m1 m2 ρ θ Year
8.4 9.3 23.3" 173° 2015
152mm f/5.9, 22x, Bortle 6, SQM-L 19.3
Easy with moderate difference in brightness. Both components appeared orange, the fainter one slightly more intense. The color was well visible at 69x.

STF104 (**)

Name: STF104
Type: **
Constellation: And
Coordinates: 01h16m57.09s / +38°27'38.70"

Components:
m1 m2 ρ θ Year
8.0 9.8 13.4" 323° 2015
152mm f/5.9, 69x, Bortle 6, SQM-L 19.3
Easy, rather close pair, but with a clear difference in brightness. Primary component appeared slightly orange, companion slightly gray-blueish.

STF105 (**)

Name: STF105
Type: **
Constellation: Cas
Coordinates: 01h18m57.50s / +66°09'28.00"

Components:
m1 m2 ρ θ Year
AB 8.8 9.8 3.0" 185° 2016
70mm f/5.7, 100x, Bortle 7
Clearly split with visible difference in brightness.

STF108 (**)

Name: STF108
Type: **
Constellation: And
Coordinates: 01h18m47.00s / +37°23'10.60"

Components:
m1 m2 ρ θ Year
6.5 9.6 6.4" 62° 2017
120mm f/5, 75x, Bortle 6, SQM-L 19.1
Easily split with big difference in brightness.

152mm f/5.9, 69x, Bortle 6, SQM-L 19.3
Easy and pretty uneven. Primary component appeared slightly yellowish.

STF162 (**)

Name: STF162
Type: **
Constellation: Per
Coordinates: 01h49m15.47s / +47°53'47.10"

Components:
m1 m2 ρ θ Year
AB 6.5 7.2 2.0" 199° 2018
70mm f/5.7, 100x
At 100x partly split, otherwise '8'-shaped. At 128x clearly split. Difference in brightness noticeable.

STF163 (**)

Name: STF163
Type: **
Constellation: Cas
Coordinates: 01h51m16.93s / +64°51'17.90"

Components:
m1 m2 ρ θ Year
AB 6.8 9.1 34.5" 38° 2018
70mm f/5.7, 20x, Bortle 7+, SQM-L 18.8
Easily split at 20x. From 44x the brighter component was orange colored, the fainter one tends to be more bluish.

STF170 (**)

Name: STF170
Type: **
Constellation: Cas
Coordinates: 01h55m27.35s / +76°13'28.40"

Components:
m1 m2 ρ θ Year
7.5 8.2 3.2" 244° 2016
70mm f/5.7, 57x, Bortle 7
At 57x barely split with noticeable difference in brightness. At 128x easy split.

STF178 (**)

Name: STF178
Type: **
Constellation: Ari
Coordinates: 01h52m02.54s / +10°48'38.10"

Components:
m1 m2 ρ θ Year
8.2 8.2 3.0" 206° 2016
63mm f/13.3, 67x, Bortle 6-, SQM-L 19.0
Clearly split, tight, apparently equally bright components.

70mm f/5.7, 100x, Bortle 7+, SQM-L 18.8
Split with equally bright components.

STF182 (**)

Name: STF182
Type: **
Constellation: Cas
Coordinates: 01h56m23.56s / +61°16'52.00"

Components:
m1 m2 ρ θ Year
AB 8.3 8.3 3.6" 125° 2016
70mm f/5.7, 57x, Bortle 7
At 44x almost split. At 57x equally bright components visible.

STF205 (**)

Name: STF205, gamma And, 57 And, Alamak
Type: **
Constellation: And
Coordinates: 02h03m53.92s / +42°19'47.50"

Components:
m1 m2 ρ θ Year
A-BC 2.3 5.0 9.4" 63° 2016
63mm f/13.3, 42x, Bortle 6-, SQM-L 19.0
Easy to split with quite large difference in brightness.

152mm f/5.9, 100x, Bortle 6, SQM-L 19.3
Very easy. A: orange, BC: rather white.

STF212 (**)

Name: STF212
Type: **
Constellation: Ari
Coordinates: 02h06m14.96s / +25°06'31.00"

Components:
m1 m2 ρ θ Year
8.3 8.7 1.9" 162° 2018
63mm f/13.3, 168x, Bortle 6-, SQM-L 19.0
Not split, but partially seen as an '8'. Overall the double star appeared rather faint and both components seemed to be similarly bright.

70mm f/5.7, 128x, Bortle 7+, SQM-L 18.8
Barely split with slight difference in brightness.

STF219 (**)

Name: STF219
Type: **
Constellation: Tri
Coordinates: 02h10m16.10s / +33°21'55.20"

Components:
m1 m2 ρ θ Year
8.0 8.9 11.7" 186° 2015
55mm f/9.1, 25x, Bortle 6, NELM 5.0+, SQM-L 19.1
Well separated with noticeable difference in brightness.

STF239 (**)

Name: STF239
Type: **
Constellation: Tri
Coordinates: 02h17m25.29s / +28°44'42.10"

Components:
m1 m2 ρ θ Year
7.1 7.8 13.6" 212° 2017
55mm f/9.1, 25x, Bortle 6, NELM 5.0+, SQM-L 19.1
Easy to split, large distance, noticeable difference in brightness.

STF245 (**)

Name: STF245
Type: **
Constellation: And
Coordinates: 02h18m36.27s / +40°16'43.70"

Components:
m1 m2 ρ θ Year
AB 7.3 8.0 11.0" 294° 2015
120mm f/5, 50x, Bortle 6, SQM-L 19.3
Both components well seen with noticeable difference in brightness.

STF249 (**)

Name: STF249
Type: **
Constellation: Tri
Coordinates: 02h21m35.66s / +44°35'59.70"

Components:
m1 m2 ρ θ Year
7.2 9.0 2.3" 196° 2015
63mm f/13.3, 168x, Bortle 6-, SQM-L 19.0
Not separated. The diffraction disk showed again and again irregularities, which indicated a double star.

STF262 (**)

Name: STF262, iota Cas
Type: **
Constellation: Cas
Coordinates: 02h29m03.96s / +67°24'08.70"

Components:
m1 m2 ρ θ Year
AB 4.6 6.9 2.7" 227° 2016
AC 4.6 9.1 6.7" 117° 2015
AD 4.6 8.5 210.9" 60° 2016
55mm f/9.1, 27x, Bortle 7
Only the D component was well visible. The components B & C were not visible even at magnifications up to 167x. The sky was clearly brightened (Bortle 7).

70mm f/5.7, 120x, Bortle 6-
Components A, B and C pretty close together, D far apart. Component B appeared slightly elongated on the first diffraction ring of the primary component. Rewarding!

../sketches/2019-08-25_iota_cas.jpg

152mm f/5.9, 129x
Component D easy to see even at lowest magnification. Component C is also easily visible at 49x. At 69x the component B is indicated, at 100x clearly visible. C appears slightly gray-blueish and obviously fainter than B. Grand sight at 129x!

STF331 (**)

Name: STF331
Type: **
Constellation: Per
Coordinates: 03h00m52.18s / +52°21'06.50"

Components:
m1 m2 ρ θ Year
5.2 6.2 11.8" 86° 2018
63mm f/13.3, 46x
Easy to separate with relatively large difference in brightness.

STF401 (**)

Name: STF401
Type: **
Constellation: Tau
Coordinates: 03h31m20.76s / +27°34'18.50"

Components:
m1 m2 ρ θ Year
AB 6.6 6.9 11.5" 270° 2018
120mm f/5, 18x, Bortle 6-, NELM 4.8+, SQM-L 19.1
Barely split at 18x. At 40x difference in brightness is visible. Nice view together with the double star STFA7 located northwest.

STF427 (**)

Name: STF427, V1268 Tau
Type: **
Constellation: Tau
Coordinates: 03h40m38.77s / +28°46'24.00"

Components:
m1 m2 ρ θ Year
7.4 7.8 7.0" 207° 2016
120mm f/5, 40x, Bortle 6-, NELM 4.8+, SQM-L 19.1
At 40x barely split. At 75x easily split with visible difference in brightness.

STF464 (**)

Name: STF464, zeta Per, 44 Per
Type: **
Constellation: Per
Coordinates: 03h54m07.92s / +31°53'01.20"

Components:
m1 m2 ρ θ Year
AB 2.9 9.2 12.9" 209° 2012
AC 2.9 11.2 33.3" 286° 2012
AD 2.9 10.4 98.6" 195° 2012
AE 2.9 10.0 120.0" 186° 2012
102mm f/11, 106x, Bortle 4, SQM-L 21.2
AB: Easy to separate, but the B component appeared only as a very faint, tiny companion.

STF470 (**)

Name: STF470, 32 Eri
Type: **
Constellation: Eri
Coordinates: 03h54m17.49s / -02°57'17.00"

Components:
m1 m2 ρ θ Year
AB 4.8 5.9 6.9" 349° 2018
55mm f/9.1, 27x, Bortle 6, NELM 5.0+
At 27x split, but still tight with noticeable difference in brightness. A slight difference in colors could be seen. At 56x the color difference was very evident: The brighter component appeared slightly yellowish, the fainter one slightly bluish. Highly recommended! The sketch was done few days later during another observation.

../sketches/2019-02-09_32_eri.jpg

STF471 (**)

Name: STF471, epsilon Per, 45 Per
Type: **
Constellation: Per
Coordinates: 03h57m51.22s / +40°00'36.90"

Components:
m1 m2 ρ θ Year
AB 2.9 8.9 9.1" 10° 2015
63mm f/13.3, 46x
Easy to separate, but much fainter, second component, which appears as a small, faint spot. Nice view.

STF479 (**)

Name: STF479
Type: **
Constellation: Tau
Coordinates: 04h00m56.81s / +23°12'05.40"

Components:
m1 m2 ρ θ Year
AB 6.9 7.8 7.5" 127° 2018
8" f/6, 37x, Bortle 4, SQM-L 21.00
Nice, evident double star, easy to split. Slight difference in brightness.

STF616 (**)

Name: STF616, omega Aur, 4 Aur
Type: **
Constellation: Aur
Coordinates: 04h59m15.41s / +37°53'24.90"

Components:
m1 m2 ρ θ Year
AB 5.0 8.2 4.8" 2014
70mm f/5.7, 44x
At 44x fainter component seen as fine star close to the primary component. At 57x wonderful view! Overall easy to split.

STF648 (**)

Name: STF648
Type: **
Constellation: Aur
Coordinates: 05h10m59.19s / +32°02'19.50"

Components:
m1 m2 ρ θ Year
AB 8.1 8.9 4.7" 62° 2017
55mm f/9.1, 40x, Bortle 6, SQM-L 19.4
At 40x tight with obviously fainter component.

70mm f/5.7, 33x
Separated, but tight with noticeable difference in brightness.

STF664 (**)

Name: STF664
Type: **
Constellation: Ori
Coordinates: 05h15m10.54s / +08°25'56.80"

Components:
m1 m2 ρ θ Year
7.8 8.4 4.7" 177° 2018
70mm f/5.7, 100x, Bortle 6, SQM-L 19.2
At 44x barely split. At 100x easily split with obvious difference in brightness.

STF666 (**)

Name: STF666
Type: **
Constellation: Aur
Coordinates: 05h17m05.80s / +33°19'47.20"

Components:
m1 m2 ρ θ Year
7.8 7.9 3.1" 76° 2018
55mm f/9.1, 83x, Bortle 6, SQM-L 19.4
At 40x slightly elongated, at 38x separated, but tight. Overall faint with components of similar brightness.

70mm f/5.7, 57x
Split, no difference in brightness and color. Very nice!

STF668 (**)

Name: STF668, 19 Ori, beta Ori, Rigel
Type: **
Constellation: Ori
Coordinates: 05h14m32.27s / -08°12'05.90"

Components:
m1 m2 ρ θ Year
A-BC 0.3 6.8 9.4" 204° 2017
55mm f/9.1, 83x
The second component was immediately seen as faint companion.

../sketches/2019-01-21_stf668.jpg

70mm f/5.7, 67x
First attempt at 133x: much fainter component clearly visible as a tiny star at a relatively large distance. After that the visibility was easy even at 67x. At 44x the faint component could only be guessed.

STF669 (**)

Name: STF669
Type: **
Constellation: Aur
Coordinates: 05h18m56.78s / +45°14'51.40"

Components:
m1 m2 ρ θ Year
8.4 9.0 9.9" 278° 2014
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated with visible difference in brightness.

STF688 (**)

Name: STF688
Type: **
Constellation: Ori
Coordinates: 05h19m20.88s / -10°44'49.90"

Components:
m1 m2 ρ θ Year
7.5 7.5 10.7" 95° 2015
70mm f/5.7, 44x, Bortle 6, SQM-L 19.2
Clearly split with decent angular distance. Components appeared nearly equally bright.

STF699 (**)

Name: STF699
Type: **
Constellation: Aur
Coordinates: 05h25m38.50s / +38°02'41.10"

Components:
m1 m2 ρ θ Year
AB 7.9 8.6 8.9" 346° 2018
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated with slightly fainter companion.

STF700 (**)

Name: STF700, V1804 Ori
Type: **
Constellation: Ori
Coordinates: 05h23m05.54s / +01°03'24.70"

Components:
m1 m2 ρ θ Year
7.7 7.9 4.8" 2017
70mm f/5.7, 44x, Bortle 6, SQM-L 19.2
At 44x split, but very close together. At 100x clearly split with nearly equally bright components.

STF716 (**)

Name: STF716, 118 Tau
Type: **
Constellation: Tau
Coordinates: 05h29m16.49s / +25°09'01.10"

Components:
m1 m2 ρ θ Year
AB 5.8 6.7 4.7" 210° 2018
70mm f/5.7, 33x
At 33x very tight with visible difference in brightness. At 47x very nice view. Both components appeared white.

STF718 (**)

Name: STF718
Type: **
Constellation: Aur
Coordinates: 05h32m20.59s / +49°23'36.50"

Components:
m1 m2 ρ θ Year
AB 7.5 7.5 7.7" 73° 2015
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Easy to split with similarly bright components. Nive view.

STF736 (**)

Name: STF736
Type: **
Constellation: Aur
Coordinates: 05h37m07.20s / +41°49'41.70"

Components:
m1 m2 ρ θ Year
7.5 8.6 2.7" - 2015
70mm f/5.7, 57x
At 57x split with almost no space in between. At 100x clearly split with noticeable fainter component.

STF742 (**)

Name: STF742
Type: **
Constellation: Tau
Coordinates: 05h36m26.38s / +21°59'35.10"

Components:
m1 m2 ρ θ Year
7.1 7.5 4.1" 274° 2017
Located about 0.5 degree east of Messier 1.

120mm f/5, 48x, Bortle 6, SQM-L 19.2
Nice, evident double near Messier 1. Easy to split with almost equally bright components.

8" f/6, 80x, Bortle 4-, SQM-L 20.8
Nice double star with nearly equally bright components.

STF764 (**)

Name: STF764
Type: **
Constellation: Aur
Coordinates: 05h41m20.98s / +29°29'14.70"

Components:
m1 m2 ρ θ Year
6.4 7.1 25.6" 14° 2017
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Easy to split with large distance and noticeable difference in brightness.

STF774 (**)

Name: STF774, zeta Ori, 50 Ori, Alnitak
Type: **
Constellation: Ori
Coordinates: 05h40m45.52s / -01°56'33.30"

Components:
m1 m2 ρ θ Year
AB 1.9 3.7 2.4" 166° 2017
70mm f/5.7, 128x, Bortle 6
Big difference in brightness. I could see the fainter component near the first ring of the Airy pattern of the brighter component.

STF796 (**)

Name: STF796
Type: **
Constellation: Aur
Coordinates: 05h49m55.53s / +31°47'08.70"

Components:
m1 m2 ρ θ Year
AB 7.2 8.2 3.7" 62° 2015
55mm f/9.1, 83x, Bortle 6, SQM-L 19.4
Well split with noticeable fainter companion.

STF845 (**)

Name: STF845, 41 Aur
Type: **
Constellation: Aur
Coordinates: 06h11m36.59s / +48°42'39.60"

Components:
m1 m2 ρ θ Year
6.2 6.9 7.5" 358° 2017
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Relatively tight with visible difference in brightness.

STF848 (**)

Name: STF848
Type: **
Constellation: Ori
Coordinates: 06h08m30.36s / +13°58'15.80"

Components:
m1 m2 ρ θ Year
AB 7.3 8.2 2.5" 111° 2017
70mm f/5.7, 100x, Bortle 6, SQM-L 19.2
Well split with obvious difference in brightness.

STF872 (**)

Name: STF872
Type: **
Constellation: Aur
Coordinates: 06h15m39.06s / +36°08'55.30"

Components:
m1 m2 ρ θ Year
AB 6.9 7.4 11.3" 215° 2017
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated with significant difference in brightness.

STF877 (**)

Name: STF877
Type: **
Constellation: Ori
Coordinates: 06h14m42.67s / +14°35'10.80"

Components:
m1 m2 ρ θ Year
7.5 8.0 5.7" 264° 2015
70mm f/5.7, 44x, Bortle 6, SQM-L 19.2
Well split, but close together. Little difference in brightness noticeable.

STF899 (**)

Name: STF899
Type: **
Constellation: Gem
Coordinates: 06h22m49.64s / +17°34'27.30"

Components:
m1 m2 ρ θ Year
7.4 8.0 2.2" 18° 2018
70mm f/5.7, 133x
Separated, but tight with visible difference in brightness.

STF900 (**)

Name: STF900, epsilon Mon, 8 Mon
Type: **
Constellation: Mon
Coordinates: 06h23m46.10s / +04°35'34.20"

Components:
m1 m2 ρ θ Year
AB 4.4 6.6 12.0" 29° 2017
55mm f/9.1, 42x
Relatively large distance and clear difference in brightness. The lighter component seemed white-yellowish, the weaker one slightly greenish-blue. The color contrast, however, was not particularly conspicuous.

STF918 (**)

Name: STF918
Type: **
Constellation: Aur
Coordinates: 06h33m57.62s / +52°27'41.80"

Components:
m1 m2 ρ θ Year
AB 7.3 8.2 4.9" 336° 2017
55mm f/9.1, 40x, Bortle 6, SQM-L 19.4
At 40x tight, at 55x well split with obviously fainter companion.

STF932 (**)

Name: STF932
Type: **
Constellation: Gem
Coordinates: 06h34m21.57s / +14°45'08.30"

Components:
m1 m2 ρ θ Year
8.3 8.5 1.6" 305° 2017
70mm f/5.7, 150x
Unfortunately a nearby lamp bothered me. I could see the double star at least elongated.

STF948 (**)

Name: STF948, 12 Lyn
Type: **
Constellation: Lyn
Coordinates: 06h46m14.15s / +59°26'30.10"

Components:
m1 m2 ρ θ Year
AB 5.4 6.0 1.9" 66° 2018
AC 5.4 7.0 8.8" 310° 2018
55mm f/9.1, 167x
AB: Components A and B separated, whereby the Airy disks slightly overlap. The difference in brightness was well visible.

../sketches/2019-01-21_stf948.jpg

55mm f/9.1, 27x
AC: Components A/B and C well separated, but tight. Significant difference in brightness. The fainter C companion appeared slightly orange, the brighter one white-bluish.

63mm f/13.3, 140x
AB: Components A and B split with almost no space in between. The difference in brightness was visible.

../sketches/2019-01-22_stf948.jpg

70mm f/5.7, 133x
AB: Both components A + B clearly split, whereby the diffraction rings where merged together. A very nice view together with component C. I sketched this triplet, which reflects my impression well. Unfortunately, the distance and position angle are not particularly well observed. Also the difference in brightness I didn't noticed during my observation.

../sketches/2019-01-20_stf948.jpg

70mm f/5.7, 22x
AC: Well split, relatively close together with significant difference in brightness.

STF958 (**)

Name: STF958
Type: **
Constellation: Lyn
Coordinates: 06h48m12.29s / +55°42'15.10"

Components:
m1 m2 ρ θ Year
AB 6.3 6.3 4.5" 77° 2018
70mm f/5.7, 33x
Clearly split, equally bright, close together. Nice view.

STF982 (**)

Name: STF982, 38 Gem
Type: **
Constellation: Gem
Coordinates: 06h54m38.63s / +13°10'40.10"

Components:
m1 m2 ρ θ Year
AB 4.8 7.8 7.4" 143° 2018
55mm f/9.1, 27x
At 27x pretty tight with much fainter component. At 71x clearly separated with clear difference in brightness. Brighter component appeared slightly yellowish, the weaker one slightly bluish.

70mm f/5.7, 33x
Easy to separated with noticeable difference in brightness. The fainter component appeared slightly orange, the brighter one rather white.

STF994 (**)

Name: STF994
Type: **
Constellation: Aur
Coordinates: 06h59m27.19s / +37°05'53.50"

Components:
m1 m2 ρ θ Year
AB 7.9 8.1 26.4" 55° 2017
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated, large distance, slight difference in brightness.

STF1009 (**)

Name: STF1009
Type: **
Constellation: Lyn
Coordinates: 07h05m39.83s / +52°45'31.30"

Components:
m1 m2 ρ θ Year
AB 6.9 7.0 4.4" 149° 2018
70mm f/5.7, 33x
Very nice view. Equally bright components, tight.

STF1050 (**)

Name: STF1050
Type: **
Constellation: Lyn
Coordinates: 07h19m51.29s / +54°55'18.40"

Components:
m1 m2 ρ θ Year
AB 8.1 8.8 19.3" 21° 2017
70mm f/5.7, 22x
Rather faint, obviously split with visible difference in brightness. View similar to STF 1062.

STF1062 (**)

Name: STF1062, 19 Lyn
Type: **
Constellation: Lyn
Coordinates: 07h22m52.06s / +55°16'53.30"

Components:
m1 m2 ρ θ Year
AB 5.8 6.7 14.8" 316° 2018
70mm f/5.7, 22x
Clearly separated, moderate distance, noticeable difference in brightness. The colors seemed different, but not exactly definable.

STF1065 (**)

Name: STF1065, 20 Lyn
Type: **
Constellation: Lyn
Coordinates: 07h22m15.11s / +50°08'55.70"

Components:
m1 m2 ρ θ Year
7.5 7.7 14.9" 256° 2017
70mm f/5.7, 22x
Nicely split, moderate distance, similarly bright.

STF1066 (**)

Name: STF1066, delta Gem, 55 Gem
Type: **
Constellation: Gem
Coordinates: 07h20m07.39s / +21°58'56.40"

Components:
m1 m2 ρ θ Year
3.5 8.2 5.5" 230° 2016
55mm f/9.1, 71x
Large difference in brightness. The fainter component was well separated, but just a very tiny star.

STF1083 (**)

Name: STF1083
Type: **
Constellation: Gem
Coordinates: 07h25m35.30s / +20°29'42.60"

Components:
m1 m2 ρ θ Year
7.3 8.1 6.7" 45° 2015
70mm f/5.7, 22x
Unequal pair. At 22x very tight, at 44x well split. Fainter companion appeared slightly orange, brighter one white-bluish.

STF1094 (**)

Name: STF1094
Type: **
Constellation: Gem
Coordinates: 07h27m25.99s / +15°18'59.00"

Components:
m1 m2 ρ θ Year
7.6 8.5 2.7" 100° 2014
70mm f/5.7, 57x
At 57x barely split with noticeable difference in brightness. At 100x well split, but still tight.

STF1110 (**)

Name: STF1110, alpha Gem, 66 Gem, Castor
Type: **
Constellation: Gem
Coordinates: 07h34m35.86s / +31°53'17.80"

Components:
m1 m2 ρ θ Year
AB 1.9 3.0 5.1" 54° 2017
AC 1.9 9.8 69.8" 163° 2017
AD 1.9 10.1 179.8" 221° 2017
55mm f/9.1, 27x
AB: At 27x slight difference in brightness visible. Double star appeared as '8'. At 38x clearly split, but tight.

70mm f/5.7, 44x, Bortle 6
AB: At 44x the double star appeared as an '8'. At 100x clearly split with noticeable difference in brightness. Both components appeared white.

STF1140 (**)

Name: STF1140
Type: **
Constellation: Gem
Coordinates: 07h48m22.61s / +18°20'12.40"

Components:
m1 m2 ρ θ Year
7.0 8.7 6.4" 273° 2015
70mm f/5.7, 44x
Easy to separate with quite clear difference in brightness.

STF1196 (**)

Name: STF1196, zeta Cnc, 16 Cnc
Type: **
Constellation: Cnc
Coordinates: 08h12m12.79s / +17°38'51.20"

Components:
m1 m2 ρ θ Year
AB-C 4.9 5.8 5.8" 66° 2017
AB 5.3 6.2 1.0" 2017
102mm f/11, 86x, Bortle 6-, SQM-L 19.2
AB-C: Easy to separate. A: light gray, B: pale orange.

120mm f/5, 67x, Bortle 6, SQM-L 19.3
AB-C: Evident difference in brightness, easy to split. Both components of similar color.

120mm f/5, 200x, Bortle 6, SQM-L 19.3
AB: Very tight. The Airy disks were still touching. Slight difference in brightness. Extremely beautiful triple star!

../sketches/2019-02-24_stf1196.jpg

STF1268 (**)

Name: STF1268, iota Cnc, 48 Cnc
Type: **
Constellation: Cnc
Coordinates: 08h46m41.82s / +28°45'35.60"

Components:
m1 m2 ρ θ Year
4.1 6.0 31.3" 308° 2016
102mm f/11, 28x
Grand sight! Pretty wide apart and unequal. A: decent orange, B: very nice light blue.

STF1275 (**)

Name: STF1275
Type: **
Constellation: UMa
Coordinates: 08h51m26.19s / +57°31'38.10"

Components:
m1 m2 ρ θ Year
AB 8.7 8.9 1.9" 198° 2015
70mm f/5.7, 100x
At 100x and 150x not permanently split. Components very close together.

STF1333 (**)

Name: STF1333
Type: **
Constellation: Lyn
Coordinates: 09h18m25.97s / +35°21'51.30"

Components:
m1 m2 ρ θ Year
6.6 6.7 1.9" 50° 2017
63mm f/13.3, 120x
At 93x seen as '8', at 120x split, but pretty tight with no visible difference in brightness.

STF1334 (**)

Name: STF1334, 38 Lyn
Type: **
Constellation: Lyn
Coordinates: 09h18m50.64s / +36°48'09.30"

Components:
m1 m2 ρ θ Year
AB 3.9 6.1 2.5" 229° 2017
63mm f/13.3, 140x
Fainter companion only seen as permanent brightening on the first diffraction ring.

../sketches/2019-01-22_stf1334.jpg

STF1344 (**)

Name: STF1344
Type: **
Constellation: LMi
Coordinates: 09h23m28.35s / +39°08'05.10"

Components:
m1 m2 ρ θ Year
9.0 9.5 3.8" 104° 2018
120mm f/5, 75x, Bortle 7+, NELM 5.0, SQM-L 18.8
At 50x and 75x split, but tight with little difference in brightness.

STF1374 (**)

Name: STF1374
Type: **
Constellation: LMi
Coordinates: 09h41m21.88s / +38°57'01.90"

Components:
m1 m2 ρ θ Year
AB 7.3 8.7 2.8" 311° 2017
120mm f/5, 168x, Bortle 7+, NELM 5.0, SQM-L 18.8
At 50x elongated, at 75x seen as '8'. At 168x clearly split with obviously fainter component.

STF1399 (**)

Name: STF1399
Type: **
Constellation: Leo
Coordinates: 09h57m02.21s / +19°45'44.60"

Components:
m1 m2 ρ θ Year
7.7 8.4 30.2" 176° 2017
70mm f/5.7, 22x
Easy to split with nice distance and obviously unequal. A conspicuous group of fainter stars is nearby. Main component appeared in a warm-white, fainter somehow darker (partly bluish, partly slightly orange).

STF1424 (**)

Name: STF1424, gamma Leo, 41 Leo, Algieba
Type: **
Constellation: Leo
Coordinates: 10h19m58.35s / +19°50'29.40"

Components:
m1 m2 ρ θ Year
AB 2.4 3.6 4.7" 127° 2017
55mm f/9.1, 38x, Bortle 6-, SQM-L 19.1
At 38x split, but very tight with noticeable difference in brightness. At 56x and higher beautiful view of both components, which seemed to have similar colors.

../sketches/2019-02-09_gamma_leo.jpg

55mm f/9.1, 59x, Bortle 6, SQM-L 19.5
Very nice unequal double. A appeared yellow-orange, B rather white-bluish.

../sketches/2019-03-09_gamma_leo.jpg

120mm f/5, 66x, Bortle 6-, SQM-L 19.1
At 48x easily seen as double star. It appeared as '8'. At 66x pretty tight with visible difference in brightness.

STF1426 (**)

Name: STF1426
Type: **
Constellation: Leo
Coordinates: 10h20m32.32s / +06°25'47.60"

Components:
m1 m2 ρ θ Year
AB-C 7.3 9.4 7.6" 2018
AB 8.0 8.3 0.9" 313° 2017
102mm f/11, 160x, Bortle 6-
AB-C: Quite large angular distance and therefor easy to separate. The C component was pretty faint.

102mm f/11, 160x, Bortle 6-
AB: At first glance elongated, on closer look visible as '8'.

STF1431 (**)

Name: STF1431
Type: **
Constellation: Leo
Coordinates: 10h25m35.12s / +08°46'35.40"

Components:
m1 m2 ρ θ Year
7.8 9.1 3.6" 74° 2017
70mm f/5.7, 67x
Separable at 67x, but very close together with a clear difference in brightness. Easy to separate at 100x. Next to it the star 44 Leo shines in a striking, bright orange.

STF1443 (**)

Name: STF1443
Type: **
Constellation: LMi
Coordinates: 10h33m17.07s / +37°40'25.00"

Components:
m1 m2 ρ θ Year
9.9 10.0 5.3" 161° 2018
120mm f/5, 50x, Bortle 7+, NELM 5.0, SQM-L 18.8
At 50x split with little distance. At 75x clearly split with small difference in brightness.

STF1450 (**)

Name: STF1450, 49 Leo
Type: **
Constellation: Leo
Coordinates: 10h35m02.16s / +08°39'01.60"

Components:
m1 m2 ρ θ Year
5.8 7.9 2.2" 156° 2017
70mm f/5.7, 133x
B component appeared as clear brightening on the first diffraction ring of the primary component in the correct position angle.

STF1459 (**)

Name: STF1459
Type: **
Constellation: LMi
Coordinates: 10h40m12.46s / +38°24'11.40"

Components:
m1 m2 ρ θ Year
8.3 8.8 5.4" 152° 2017
120mm f/5, 50x, Bortle 7+, NELM 5.0, SQM-L 18.8
Clearly split with noticeable difference in brightness.

STF1466 (**)

Name: STF1466, 35 Sex
Type: **
Constellation: Sex
Coordinates: 10h43m20.91s / +04°44'51.60"

Components:
m1 m2 ρ θ Year
AB 6.2 7.1 6.7" 239° 2017
102mm f/11, 28x, Bortle 6-, SQM-L 18.8
Very nice view. At 28x obviously unequal and easy to split. A appeared slightly orange. At 86x B appeared gray-blue.

../sketches/2019-04-06_35_sex.jpg

STF1487 (**)

Name: STF1487, 54 Leo
Type: **
Constellation: Leo
Coordinates: 10h55m36.80s / +24°44'59.00"

Components:
m1 m2 ρ θ Year
4.5 6.3 6.6" 113° 2017
55mm f/9.1, 27x
At 27x split, but very tight with noticeable difference in brightness. At 71x easy to separate. No visible color difference.

STF1523 (**)

Name: STF1523, xi UMa, 53 UMa, Alula Australis
Type: **
Constellation: UMa
Coordinates: 11h18m10.90s / +31°31'45.00"

Components:
m1 m2 ρ θ Year
AB 4.3 4.8 1.9" 166° 2017
55mm f/9.1, 83x, Bortle 6-, SQM-L 19.1
2019-02-09: Already seen as '8' at 83x. At 125x the overlapping of both Airy disks was visible, but also a slight difference in brightness.

../sketches/2019-02-09_xi_uma.jpg

70mm f/5.7, 100x, Bortle 6
2018-02-18: Very close together with similar brightness. At first glance seen as an '8', looking closer I partly split both components. Similar view also at 128x.

120mm f/5, 168x, Bortle 6, SQM-L 19.1
2018-02-14: Well split with slight difference in brightness.

152mm f/5.9, 129x, Bortle 6, NELM 5.0+
2019-02-06: Well split with visible difference in brightness. The colors of both components appeared equal.

STF1540 (**)

Name: STF1540, 83 Leo
Type: **
Constellation: Leo
Coordinates: 11h26m45.32s / +03°00'47.20"

Components:
m1 m2 ρ θ Year
AB 6.5 7.5 28.1" 149° 2017
55mm f/9.1, 16x, Bortle 6, SQM-L 19.5
Wonderful double with slight color contrast in a very nice field. Together with tau Leo stunning view. Slightly unequal. A appeared white-yellowish, B rather gray-bluish.

../sketches/2019-03-09_83_leo_tau_leo.jpg

STF1547 (**)

Name: STF1547, 88 Leo
Type: **
Constellation: Leo
Coordinates: 11h31m44.94s / +14°21'52.20"

Components:
m1 m2 ρ θ Year
AB 6.3 9.1 15.6" 332° 2017
55mm f/9.1, 42x, Bortle 6, SQM-L 19.5
Well split with moderate distance. Primary component appeared white-yellowish. Pretty unequal pair.

STF1552 (**)

Name: STF1552, 90 Leo
Type: **
Constellation: Leo
Coordinates: 11h34m42.50s / +16°47'48.90"

Components:
m1 m2 ρ θ Year
AC 6.3 9.8 62.8" 235° 2017
AB 6.3 7.3 3.5" 209° 2017
55mm f/9.1, 42x, Bortle 6, SQM-L 19.5
AB: A and B very tight and unequal. Much fainter component C very wide apart. All components almost in line. Very nice view.

../sketches/2019-03-09_90_leo.jpg

STF1579 (**)

Name: STF1579, 65 UMa
Type: **
Constellation: UMa
Coordinates: 11h55m05.74s / +46°28'36.60"

Components:
m1 m2 ρ θ Year
AB-C 6.7 8.3 3.8" 40° 2017
AB-D 6.7 7.0 63.7" 113° 2017
55mm f/9.1, 83x, Bortle 6-, SQM-L 19.1
AB-C: Easy to split, but the faint C component only appeared as a tiny star.

../sketches/2019-02-09_65_uma.jpg

55mm f/9.1, 27x, Bortle 6-, SQM-L 19.1
AB-D: Easy to separate with large distance and very small difference in brightness. The D component showed a bluish tint, the lighter one (AB) a slightly yellowish tint. At higher magnification also the faint C component is visible.

STF1626 (**)

Name: STF1626
Type: **
Constellation: Dra
Coordinates: 12h16m47.11s / +70°08'45.70"

Components:
m1 m2 ρ θ Year
9.4 9.6 2.1" 2017
120mm f/5, 150x, Bortle 6, NELM 5.0+, SQM-L 19.3
Components similar in brightness, pretty faint, close together, but clearly split.

STF1657 (**)

Name: STF1657, 24 Com
Type: **
Constellation: Com
Coordinates: 12h35m07.76s / +18°22'37.40"

Components:
m1 m2 ρ θ Year
5.1 6.3 20.2" 271° 2018
102mm f/11, 28x
Very beautiful view with moderate distance and difference in brightness. A: glossy, light orange, B: white- bluish.

8" f/6, 60x, Bortle 4, NELM 6.0, SQM-L 21.0
Well split with obvious difference in brightness. Fainter component appeared bluish, the brighter one slightly orange.

STF1670 (**)

Name: STF1670, gamma Vir, 29 Vir, Porrima
Type: **
Constellation: Vir
Coordinates: 12h41m39.60s / -01°26'57.90"

Components:
m1 m2 ρ θ Year
AB 3.5 3.5 2.7" - 2018
55mm f/9.1, 56x
2019-05-18: At 38x slightly elongated. At 56x touching diffraction disks. At 71x clearly separated with very small gap.

70mm f/5.7, 104x, Bortle 6, SQM-L 19.5
2019-05-04: At 47x clearly visible as '8', at 73x split with almost touching diffraction disks. At 104x clearly separated, equally bright and pretty close together. The gap was smaller than the diameter of the diffraction disk.

102mm f/11, 125x
2019-05-01: Extremely nice double star! Equally bright and relatively close together. Both components appeared yellowish-white.

STF1692 (**)

Name: STF1692, 12 CVn, alpha CVn, Cor Caroli
Type: **
Constellation: CVn
Coordinates: 12h56m01.67s / +38°19'06.20"

Components:
m1 m2 ρ θ Year
AB 2.9 5.5 19.3" 229° 2017
70mm f/5.7, 22x
Beautiful view. Clearly unequal with nice angular distance. Primary component appeared in pale yellow, secondary component silvery-white.

4.5" f/8, 28x, Bortle 6, NELM 5.3, SQM-L 19.7
Well split with big difference in brightness.

STF1694 (**)

Name: STF1694
Type: **
Constellation: Cam
Coordinates: 12h49m13.80s / +83°24'46.30"

Components:
m1 m2 ρ θ Year
AB 5.3 5.7 21.8" 324° 2017
70mm f/5.7, 15x, Bortle 6-, NELM 5.0, SQM-L 19.1
Easy to split with noticeable angular distance and slight difference in brightness. The faint component tends to be more bluish, the brighter one appeared more light yellowish.

STF1724 (**)

Name: STF1724, theta Vir, 51 Vir
Type: **
Constellation: Vir
Coordinates: 13h09m57.01s / -05°32'20.10"

Components:
m1 m2 ρ θ Year
AB 4.4 9.4 6.8" 342° 2014
70mm f/5.7, 47x, Bortle 6, SQM-L 19.5
Easy to split with large difference in brightness. Very faint B component clearly apart from the primary component.

STF1734 (**)

Name: STF1734
Type: **
Constellation: Vir
Coordinates: 13h20m41.57s / +02°56'31.90"

Components:
m1 m2 ρ θ Year
6.8 7.3 1.1" 173° 2017
70mm f/5.7, 104x, Bortle 6, SQM-L 19.5
Double star appeared slightly elongated without noticeable constriction.

STF1740 (**)

Name: STF1740
Type: **
Constellation: Vir
Coordinates: 13h23m39.16s / +02°43'24.00"

Components:
m1 m2 ρ θ Year
7.1 7.4 26.1" 75° 2016
70mm f/5.7, 33x, Bortle 6, SQM-L 19.5
Easy to separate, slightly unequal with moderate angular distance. A: pale orange, B: color not clearly perceptible.

STF1744 (**)

Name: STF1744, zeta UMa
Type: **
Constellation: UMa
Coordinates: 13h23m55.42s / +54°55'31.50"

Components:
m1 m2 ρ θ Year
79 UMa, zeta UMa, Mizar AB 2.2 3.9 14.4" 153° 2017
Mizar + Alcor AC 2.2 4.0 707.7" 72° 2017
102mm f/11, 28x
First pastel sketch (Pitt pastel by Faber-Castell) of a double star on black paper, where also the halos were sketched around the stars. The stars themselves were redrawn with an Edding (Edding 1500, Soft Pastel white).

../sketches/2019-08-14_mizar_alcor.jpg

STF1788 (**)

Name: STF1788
Type: **
Constellation: Vir
Coordinates: 13h54m58.20s / -08°03'31.90"

Components:
m1 m2 ρ θ Year
AB 6.7 7.3 3.7" 101° 2018
70mm f/5.7, 47x, Bortle 6, SQM-L 19.5
Very nice view! Pretty tight together with a moderate difference in brightness.

STF1834 (**)

Name: STF1834
Type: **
Constellation: Boo
Coordinates: 14h20m17.60s / +48°30'25.10"

Components:
m1 m2 ρ θ Year
8.1 8.3 1.6" 104° 2018
120mm f/5, 150x, Bortle 6, NELM 5.0+, SQM-L 19.4
At 108x elongated, at 150x barely split with similarly bright components.

STF1835 (**)

Name: STF1835
Type: **
Constellation: Boo
Coordinates: 14h23m22.74s / +08°26'47.90"

Components:
m1 m2 ρ θ Year
A-BC 5.0 6.8 6.2" 196° 2018
102mm f/11, 62x
At 28x barely split with visible difference in brightness. At 62x easy to separate. The colors seemed similar.

STF1877 (**)

Name: STF1877, epsilon Boo, Izar
Type: **
Constellation: Boo
Coordinates: 14h44m59.14s / +27°04'29.90"

Components:
m1 m2 ρ θ Year
AB 2.6 4.8 2.9" 344° 2018
55mm f/9.1, 125x
The fainter component was seen as permanent brightening on the first diffraction ring of the primary component.

60mm f/10, 192x, Bortle 6-, SQM-L 19.1
Easy to split, whereby the much fainter component lies on the first diffraction ring of the primary component. The primary component itself appeared slightly yellowish.

../sketches/2018-04-10_eps_boo.jpg

70mm f/5.7, 133x, Bortle 6, SQM-L 19.2
Easy to split, very unequal. A appeared in pale orange, B was visible as a very tiny, gray star on the first diffraction ring of component A.

120mm f/5, 192x, Bortle 4, SQM-L 21.3
At 85x the fainter component was easily visible but not separated. At 192x well split. The fainter component was almost on the first diffraction ring of the primary component. Quite big difference in brightness. I did not looked at the color of the components.

STF1884 (**)

Name: STF1884
Type: **
Constellation: Boo
Coordinates: 14h48m23.37s / +24°22'01.00"

Components:
m1 m2 ρ θ Year
6.6 7.5 2.2" 56° 2018
102mm f/11, 86x
At 86x pretty tight and unequal. At 160x clearly split. A: white, B: slightly orange.

STF1886 (**)

Name: STF1886
Type: **
Constellation: Boo
Coordinates: 14h51m02.31s / +09°43'25.20"

Components:
m1 m2 ρ θ Year
AB 7.6 9.7 7.8" 226° 2017
102mm f/11, 28x
At 28x, the B component appeared rather faint and pretty close to the primary component. At 62x both components were clearly visible and unequal. A: slightly orange, B: grayish.

STF1890 (**)

Name: STF1890, 39 Boo
Type: **
Constellation: Boo
Coordinates: 14h49m41.37s / +48°43'15.60"

Components:
m1 m2 ρ θ Year
6.3 6.7 2.6" 46° 2018
70mm f/5.7, 67x, Bortle 6, SQM-L 19.2
At 44x elongated, partly with constriction. At 67x split, but very tight. A difference in brightness was not seen. At 133x clearly separated with little difference in brightness. A appeared pale yellow, B rather warm-white.

STF1954 (**)

Name: STF1954, delta Ser, 13 Ser
Type: **
Constellation: Ser
Coordinates: 15h34m48.14s / +10°32'20.00"

Components:
m1 m2 ρ θ Year
AB 4.2 5.2 4.0" 173° 2018
AC 4.2 13.9 66.6" 18° 2014
CD 13.9 14.6 4.1" 339° 2015
70mm f/5.7, 57x, Bortle 4, SQM-L 20.9
AB: Easy to separate with relatively close components and a clear difference in brightness. A appeared rather white, B slightly orange.

STF1964 (**)

Name: STF1964
Type: **
Constellation: CrB
Coordinates: 15h38m12.91s / +36°14'48.60"

Components:
m1 m2 ρ θ Year
AC 8.1 8.1 14.5" 90° 2017
CD 8.1 9.0 1.6" 21° 2017
102mm f/11, 62x
AC: Rather wide pair, equal without visible difference in color.

120mm f/5, 23x, Bortle 6, NELM 5.0+, SQM-L 19.4
AC: Nice double star, well split with equally bright components.

STF1965 (**)

Name: STF1965, zeta 2 CrB
Type: **
Constellation: CrB
Coordinates: 15h39m22.68s / +36°38'09.00"

Components:
m1 m2 ρ θ Year
5.0 5.9 6.4" 306° 2018
102mm f/11, 28x
At 28x very tight and barely split, unequal. At 86x very nice view. No difference in color: both components appeared white.

120mm f/5, 48x, Bortle 6, NELM 5.0+, SQM-L 19.4
Very nice double star, well split with noticeable difference in brightness.

STF1973 (**)

Name: STF1973
Type: **
Constellation: CrB
Coordinates: 15h46m24.50s / +36°26'45.60"

Components:
m1 m2 ρ θ Year
7.6 8.8 30.8" 320° 2015
120mm f/5, 23x, Bortle 6, NELM 5.0+, SQM-L 19.4
Nice double star, easy to split with noticeable difference in brightness.

STF2016 (**)

Name: STF2016
Type: **
Constellation: Her
Coordinates: 16h12m07.05s / +11°54'39.20"

Components:
m1 m2 ρ θ Year
8.5 9.6 7.6" 148° 2017
Only 11 arcminutes northwestward is the pretty bright planetary nebula IC4593.

120mm f/5, 40x, Bortle 4, SQM-L 21.0
SQM-L 20.6: Split at 40x with obvious difference in brightness. At 75x easily split.

STF2021 (**)

Name: STF2021, 49 Ser
Type: **
Constellation: Ser
Coordinates: 16h13m18.45s / +13°31'37.20"

Components:
m1 m2 ρ θ Year
AB 7.4 7.5 4.1" 358° 2018
70mm f/5.7, 57x, Bortle 4, SQM-L 20.9
Lovely split. Almost equal pair with relatively close components.

STF2034 (**)

Name: STF2034
Type: **
Constellation: UMi
Coordinates: 15h48m43.02s / +83°37'10.50"

Components:
m1 m2 ρ θ Year
7.7 8.0 1.1" 110° 2017
102mm f/11, 187x, Bortle 6-, SQM-L 18.8
At 187x clearly elongated, partly visible as '8' with slight difference in brightness. At 280x two distinct, slightly overlapping Airy disks visible.

STF2054 (**)

Name: STF2054
Type: **
Constellation: Dra
Coordinates: 16h23m47.19s / +61°41'47.00"

Components:
m1 m2 ρ θ Year
AB 6.2 7.1 0.9" 351° 2018
70mm f/5.7, 133x, Bortle 4, SQM-L 20.9
Not split in any way.

102mm f/11, 160x, Bortle 6, SQM-L 19.4
Immediately visible as a double star. The diffraction disks overlapped slightly. The difference in brightness was clearly visible. Together with the nearby double star eta Dra in the same field of view, the sight was highly fascinating, as both double stars are very different in their appearance.

../sketches/2019-06-25_stf2054.jpg

STF2084 (**)

Name: STF2084, zeta Her, 40 Her
Type: **
Constellation: Her
Coordinates: 16h41m17.16s / +31°36'09.80"

Components:
m1 m2 ρ θ Year
3.0 5.4 1.6" 121° 2017
102mm f/11, 280x, Bortle 6, SQM-L 19.4
After a longer, concentrated observation, a permanent brightening of the first diffraction ring of the primary component could be seen at the correct position angle. The brightening appeared only arch-shaped without any noticeable condensation.

../sketches/2019-06-25_zeta_her.jpg

102mm f/11, 224x
Faint companion as distinct brightening on the first diffraction ring visible. In steadier moments visible as small, round condensation.

../sketches/2019-06-30_zeta_her.jpg

STF2098 (**)

Name: STF2098
Type: **
Constellation: Her
Coordinates: 16h45m43.47s / +30°00'17.20"

Components:
m1 m2 ρ θ Year
AB 8.8 9.6 14.3" 145° 2015
AC 8.8 8.8 65.9" 128° 2015
AD 8.8 11.0 67.6" 18° 2015
DE 11.0 13.7 5.8" 268° 2015
102mm f/11, 86x, Bortle 6
Already at 28x the components A, B and C were noticeable at first view. At 86x, component D could also be observed very well. The components are all comparatively far apart.

../sketches/2019-06-23_stf2098.jpg

STF2140 (**)

Name: STF2140, alpha Her, 64 Her, Ras Algethi
Type: **
Constellation: Her
Coordinates: 17h14m38.86s / +14°23'24.90"

Components:
m1 m2 ρ θ Year
AB 3.5 5.4 4.8" 104° 2018
55mm f/9.1, 41x
Well split with noticeable difference in brightness.

120mm f/5, 100x, Bortle 6
Easily split with noticeable difference in brightness. A: intensively orange colored, B: slightly orange.

STF2161 (**)

Name: STF2161, 75 Her, rho Her
Type: **
Constellation: Her
Coordinates: 17h23m40.97s / +37°08'45.30"

Components:
m1 m2 ρ θ Year
AB 4.5 5.4 4.1" 321° 2018
55mm f/9.1, 38x
Very nice view. Easily split with visible difference in brightness. Pretty tight. Component A appeared rather white, B slightly yellowish. The double star forms with two other, fainter field stars a conspicuous, acute-angled triangle, whereby the double star marks the tip.

STF2224 (**)

Name: STF2224, V826 Her
Type: **
Constellation: Her
Coordinates: 17h45m58.44s / +39°19'21.00"

Components:
m1 m2 ρ θ Year
AB 6.7 10.0 7.9" 349° 2015
120mm f/5, 100x, Bortle 6
Well split, rather close and obviously unequal. Primary component appeared slightly yellowish, secondary still visible with direct vision.

STF2280 (**)

Name: STF2280, 100 Her
Type: **
Constellation: Her
Coordinates: 18h07m49.56s / +26°06'04.40"

Components:
m1 m2 ρ θ Year
AB 5.8 5.8 14.3" 183° 2018
120mm f/5, 40x, Bortle 5+, SQM-L 20.8
SQM-L 20.5: Very nice, evident double star with equally bright components.

152mm f/5.9, 22x, Bortle 3-, SQM-L 21.3
Beautiful view. Easy to separate with components of the same brightness. It is noticeable that there are no brighter stars in the immediate vicinity, so that the double star stands out very well.

STF2308 (**)

Name: STF2308
Type: **
Constellation: Dra
Coordinates: 18h00m09.07s / +80°00'13.70"

Components:
m1 m2 ρ θ Year
40/41 Dra AB 5.7 6.0 18.7" 232° 2018
AC 5.7 8.3 224.8" 129° 2004
102mm f/11, 28x
Very nice, slightly uneven pair. Components appeared yellowish-white. Beautiful surroundings. On the sketch the components A, B and C are visible.

../sketches/2019-06-30_40_41_dra.jpg

STF2323 (**)

Name: STF2323, 39 Dra
Type: **
Constellation: Dra
Coordinates: 18h23m54.65s / +58°48'02.10"

Components:
m1 m2 ρ θ Year
AC 5.1 8.0 89.1" 19° 2017
AB 5.1 8.1 3.8" 348° 2018
55mm f/9.1, 27x
AC: Pretty wide, unequal pair. Die brighter A component appeared white.

55mm f/9.1, 71x
AB: Very nice. The B component seemed to be comparable faint as the C component.

../sketches/2019-05-18_39_dra.jpg

STF2349 (**)

Name: STF2349
Type: **
Constellation: Lyr
Coordinates: 18h36m37.34s / +33°28'08.50"

Components:
m1 m2 ρ θ Year
AB 5.4 9.4 7.2" 204° 2016
102mm f/11, 125x, Bortle 6
Easy to split with a clear difference in brightness. The companion only appeared as a tiny star.

../sketches/2019-06-23_stf2349.jpg

STF2351 (**)

Name: STF2351
Type: **
Constellation: Lyr
Coordinates: 18h36m12.00s / +41°16'41.20"

Components:
m1 m2 ρ θ Year
7.6 7.6 5.1" 160° 2017
70mm f/5.7, 57x
Beautiful, little double star with equally bright components at a moderate distance.

STF2404 (**)

Name: STF2404
Type: **
Constellation: Aql
Coordinates: 18h50m45.55s / +10°58'35.20"

Components:
m1 m2 ρ θ Year
6.9 7.8 3.5" 182° 2018
70mm f/5.7, 44x
Already at 22x the double star is striking due to its orange color. At 44x split, but rather tight with a clear difference in brightness. At 100x the primary component appears in a bright orange, the secondary component shows a blueish tint.

STF2434 (**)

Name: STF2434
Type: **
Constellation: Aql
Coordinates: 19h02m44.38s / -00°42'40.40"

Components:
m1 m2 ρ θ Year
A-BC 8.4 8.9 27.6" 89° 2017
120mm f/5, 18x, Bortle 4, SQM-L 21.1
Easily split with similar brightness.

STF2449 (**)

Name: STF2449
Type: **
Constellation: Aql
Coordinates: 19h06m23.04s / +07°09'20.10"

Components:
m1 m2 ρ θ Year
7.2 7.7 8.0" 289° 2015
70mm f/5.7, 22x
At 22x well separable, but quite close together. Some fainter and similarly bright stars in the immediate surrounding. At 57x small difference in brightness. Main component looked white-blueish, companion slightly orange.

STF2461 (**)

Name: STF2461, 17 Lyr
Type: **
Constellation: Lyr
Coordinates: 19h07m25.58s / +32°30'06.20"

Components:
m1 m2 ρ θ Year
AB 5.3 9.1 3.2" 281° 2017
152mm f/5.9, 129x, Bortle 6
At 129x clearly split. The B component was just visible as pretty faint, tiny star. At 270x much easier visible.

STF2470 (**)

Name: STF2470
Type: **
Constellation: Lyr
Coordinates: 19h08m45.20s / +34°45'37.10"

Components:
m1 m2 ρ θ Year
7.0 8.4 13.8" 267° 2017
102mm f/11, 40x, Bortle 6, SQM-L 19.4
Striking, especially with STF 2474 in one visual field. The color of the components was not clearly visible. Worthwhile! Sketch see STF 2474.

STF2474 (**)

Name: STF2474
Type: **
Constellation: Lyr
Coordinates: 19h09m04.35s / +34°35'59.90"

Components:
m1 m2 ρ θ Year
AB 6.8 7.9 15.9" 264° 2018
102mm f/11, 40x, Bortle 6, SQM-L 19.4
Pretty conspicuous, easy double star. Especially attractive with the nearby double star STF 2470, as both are very similar in brightness, distance and position angle. The color of both components appeared slightly yellowish-orange.

../sketches/2019-06-26_stf2470_stf2474.jpg

STF2486 (**)

Name: STF2486
Type: **
Constellation: Cyg
Coordinates: 19h12m05.03s / +49°51'20.70"

Components:
m1 m2 ρ θ Year
AB 6.5 6.7 7.1" 204° 2018
70mm f/5.7, 22x, Bortle 6-
At 22x barely split with a slight difference in brightness. At 44x the primary looked orange. I could not determine the color of the companion.

STF2496 (**)

Name: STF2496
Type: **
Constellation: Cyg
Coordinates: 19h15m19.18s / +50°04'16.00"

Components:
m1 m2 ρ θ Year
AB 6.5 10.0 2.1" 81° 2015
AC 6.5 11.2 186.1" 242° 2003
152mm f/5.9, 270x, Bortle 6
AB: In steadier moments, the much fainter companion can be seen near the first diffraction ring of the primary component.

STF2578 (**)

Name: STF2578
Type: **
Constellation: Cyg
Coordinates: 19h45m39.65s / +36°05'27.60"

Components:
m1 m2 ρ θ Year
AB 6.4 7.0 14.9" 125° 2018
70mm f/5.7, 22x
At 22x easy with visible brightness and color difference. The slight color difference is even better visible at 44x: A appears white-yellowish, B slightly blueish.

STF2579 (**)

Name: STF2579, delta Cyg, 18 Cyg
Type: **
Constellation: Cyg
Coordinates: 19h44m58.44s / +45°07'50.50"

Components:
m1 m2 ρ θ Year
AB 2.9 6.3 2.7" 217° 2016
70mm f/5.7, 200x, Bortle 6-
At 100x only indicated. At 200x the much fainter companion is visible as a slightly elongated brightening on the first diffraction ring.

STF2583 (**)

Name: STF2583, pi Aql
Type: **
Constellation: Aql
Coordinates: 19h48m42.05s / +11°48'57.30"

Components:
m1 m2 ρ θ Year
AB 6.3 6.8 1.4" 106° 2018
120mm f/5, 337x, Bortle 4-, SQM-L 20.7
At 100x elongated, at 200x seen as '8'. At 337x split in moments of good seeing, but still very tight. Overall the seeing was not so good.

STF2605 (**)

Name: STF2605, psi Cyg, 24 Cyg
Type: **
Constellation: Cyg
Coordinates: 19h55m37.82s / +52°26'20.50"

Components:
m1 m2 ρ θ Year
AB 5.0 7.5 2.8" 177° 2014
70mm f/5.7, 100x, Bortle 6-
At 80x difficult. At 100x and 133x the fainter component was clearly visible as small, roundish, partly slightly oval brightening.

STF2644 (**)

Name: STF2644
Type: **
Constellation: Aql
Coordinates: 20h12m35.09s / +00°52'00.20"

Components:
m1 m2 ρ θ Year
6.9 7.1 2.6" 206° 2018
70mm f/5.7, 57x
Very tight at 57x, but separable without noticeable difference in brightness. At 100x very small difference in brightness visible. The colors of both components appeared to be the same, but not clearly perceptible.

STF2671 (**)

Name: STF2671
Type: **
Constellation: Cyg
Coordinates: 20h18m24.76s / +55°23'49.80"

Components:
m1 m2 ρ θ Year
AB 6.0 7.5 3.8" 337° 2016
70mm f/5.7, 57x, Bortle 6-
Pretty tight with a clear difference in brightness. I couldn't see anything conspicuous regarding colors.

STF2675 (**)

Name: STF2675, kappa Cep, 1 Cep
Type: **
Constellation: Cep
Coordinates: 20h08m53.32s / +77°42'40.90"

Components:
m1 m2 ρ θ Year
AB 4.4 8.3 7.2" 120° 2003
55mm f/9.1, 38x, Bortle 6
At 27x faint companion not visible. At 38x and higher magnification the companion is quite easily visible as faint, tiny star. Very nice, uneven pair!

STF2690 (**)

Name: STF2690
Type: **
Constellation: Del
Coordinates: 20h31m11.94s / +11°15'33.70"

Components:
m1 m2 ρ θ Year
A-BC 7.1 7.4 17.7" 256° 2018
8" f/6, 37x, Bortle 4, NELM 5.7+, SQM-L 20.9
NELM 5.4+, SQM-L 20.6: Evident double star with almost equally bright components and no noticeable contrast in color.

STF2737 (**)

Name: STF2737, epsilon Equ, 1 Equ
Type: **
Constellation: Equ
Coordinates: 20h59m04.54s / +04°17'37.80"

Components:
m1 m2 ρ θ Year
AB 6.0 6.3 0.1" 300° 2018
AD 6.0 13.1 69.3" 293° 2013
AB-C 5.3 7.0 10.6" 67° 2018
70mm f/5.7, 22x, Bortle 6-
AB-C: At 22x well seperated, but still relatively close together with a clear difference in brightness. At 44x AB looked rather white. The color of C was not apparent.

STF2742 (**)

Name: STF2742
Type: **
Constellation: Equ
Coordinates: 21h02m12.51s / +07°10'47.30"

Components:
m1 m2 ρ θ Year
7.4 7.6 2.9" 215° 2017
70mm f/5.7, 57x, Bortle 6-
At 44x almost split with slight difference in brightness. At 57x split, but tight.

STF2765 (**)

Name: STF2765
Type: **
Constellation: Equ
Coordinates: 21h10m59.31s / +09°32'57.90"

Components:
m1 m2 ρ θ Year
AB 8.5 8.5 2.8" 79° 2016
AC 8.5 14.2 44.2" 167° 2015
70mm f/5.7, 80x, Bortle 6-
AB: At 44x pretty faint, clearly elongated, notched. At 57x almost separated. At 80x and 100x clearly separated, rather tight, matched.

STF2767 (**)

Name: STF2767
Type: **
Constellation: Peg
Coordinates: 21h10m30.43s / +19°57'35.70"

Components:
m1 m2 ρ θ Year
8.2 8.5 2.5" 29° 2016
70mm f/5.7, 100x
Clearly split with slight difference in brightness.

STF2786 (**)

Name: STF2786
Type: **
Constellation: Equ
Coordinates: 21h19m39.36s / +09°31'30.30"

Components:
m1 m2 ρ θ Year
7.5 8.2 2.8" 189° 2016
70mm f/5.7, 57x, Bortle 6-
At 44x elongated, slightly notched. At 57x barely split with visible, but little difference in brightness.

STF2789 (**)

Name: STF2789
Type: **
Constellation: Cyg
Coordinates: 21h19m58.84s / +52°58'44.10"

Components:
m1 m2 ρ θ Year
AB 7.7 7.9 6.9" 115° 2018
70mm f/5.7, 44x, Bortle 6-
At 22x almost separated. The double star appeared strikingly orange and forms a conspicuous, nearly isosceles triangle with neighbouring stars. At 44x clearly separated, relatively close together with a small difference in brightness.

../sketches/2019-07-28_stf2789.jpg

STF2793 (**)

Name: STF2793
Type: **
Constellation: Equ
Coordinates: 21h25m05.66s / +09°23'02.60"

Components:
m1 m2 ρ θ Year
AB-C 7.4 9.0 26.4" 241° 2014
70mm f/5.7, 22x, Bortle 6-
At 22x easily separable with relatively large angular distance. C component much fainter. At 44x AB appeared white-yellowish, C somewhat reddish.

STF2799 (**)

Name: STF2799
Type: **
Constellation: Peg
Coordinates: 21h28m52.79s / +11°05'05.20"

Components:
m1 m2 ρ θ Year
AB 7.4 7.4 1.9" 260° 2018
70mm f/5.7, 100x
At 100x, barely, at 128x clearly split with equally bright components.

STF2807 (**)

Name: STF2807
Type: **
Constellation: Cep
Coordinates: 21h17m33.47s / +82°31'03.70"

Components:
m1 m2 ρ θ Year
8.7 8.8 1.9" 309° 2016
70mm f/5.7, 128x, Bortle 5, NELM 5.7, SQM-L 20.6
Barely split without any noticeable difference in brightness.

STF2840 (**)

Name: STF2840
Type: **
Constellation: Cep
Coordinates: 21h52m01.02s / +55°47'48.30"

Components:
m1 m2 ρ θ Year
AB 5.6 6.4 17.7" 197° 2018
55mm f/9.1, 25x
Striking double star with clear distance and difference in brightness.

70mm f/5.7, 22x, Bortle 6-
Striking, beautiful double star with visible difference in brightness. At 44x A appeared rather yellowish, B slightly blueish, whereby the colors were difficult to detect.

STF2845 (**)

Name: STF2845
Type: **
Constellation: Cep
Coordinates: 21h52m20.95s / +63°06'04.50"

Components:
m1 m2 ρ θ Year
AB 8.1 8.2 2.0" 173° 2016
70mm f/5.7, 128x, Bortle 4-, SQM-L 20.9
Easy to split with equally bright components.

STF2848 (**)

Name: STF2848
Type: **
Constellation: Peg
Coordinates: 21h58m01.45s / +05°56'25.30"

Components:
m1 m2 ρ θ Year
7.2 7.7 10.9" 57° 2015
70mm f/5.7, 22x
At 22x nicely separated, but still relatively close together with a small difference in brightness. The brighter component appeared cooler in color (white-blueish), the fainter one warmer (slightly orange). At 44x the color impression was similar.

STF2854 (**)

Name: STF2854
Type: **
Constellation: Peg
Coordinates: 22h04m22.52s / +13°38'53.40"

Components:
m1 m2 ρ θ Year
7.8 7.9 1.5" 84° 2017
70mm f/5.7, 133x
Observed at 133x and 160x. Clearly elongated, from time to time with very little indentation. The air could have been steadier.

STF2863 (**)

Name: STF2863, xi Cep, 17 Cep
Type: **
Constellation: Cep
Coordinates: 22h03m47.45s / +64°37'40.70"

Components:
m1 m2 ρ θ Year
AB 4.5 6.4 8.1" 275° 2018
55mm f/9.1, 27x, Bortle 6
At 27x well separable, but quite close together with a clear difference in brightness. At 71x very nice view.

STF2873 (**)

Name: STF2873
Type: **
Constellation: Cep
Coordinates: 21h58m13.53s / +82°52'10.80"

Components:
m1 m2 ρ θ Year
AB 7.0 7.5 13.8" 66° 2017
55mm f/9.1, 25x
Easy to split with visible difference in brightness. Stands out immediately.

STF2903 (**)

Name: STF2903
Type: **
Constellation: Cep
Coordinates: 22h21m45.20s / +66°42'22.60"

Components:
m1 m2 ρ θ Year
7.1 7.8 4.1" 97° 2017
55mm f/9.1, 55x
At 55x split with noticeable difference in brightness. At 83x very well split with significantly fainter component.

STF2947 (**)

Name: STF2947
Type: **
Constellation: Cep
Coordinates: 22h49m00.68s / +68°34'12.20"

Components:
m1 m2 ρ θ Year
AB 6.9 7.0 4.7" 56° 2018
55mm f/9.1, 40x
At 25x elongated, at 40x split, but tight. At 55x well split, almost equally bright.

STF2968 (**)

Name: STF2968
Type: **
Constellation: Peg
Coordinates: 23h00m42.41s / +31°04'58.70"

Components:
m1 m2 ρ θ Year
6.7 9.5 3.2" 93° 2012
70mm f/5.7, 133x
Already at 57x the companion could be guessed in the correct position angle. At 133x it was clearly visible as a faint knot on the first diffraction ring.

STF2971 (**)

Name: STF2971
Type: **
Constellation: Cep
Coordinates: 22h56m41.48s / +78°29'45.00"

Components:
m1 m2 ρ θ Year
8.0 8.9 5.5" 2016
55mm f/9.1, 40x
At 25x split to some extend. At 40x well split with noticeable difference in brightness.

STF2974 (**)

Name: STF2974
Type: **
Constellation: Peg
Coordinates: 23h05m01.12s / +33°23'08.00"

Components:
m1 m2 ρ θ Year
8.1 8.5 2.7" 166° 2016
70mm f/5.7, 100x
At 57x separated, but pretty tight with apparently equally bright components. At 100x clearly split with slight difference in brightness.

STF2978 (**)

Name: STF2978
Type: **
Constellation: Peg
Coordinates: 23h07m27.73s / +32°49'31.30"

Components:
m1 m2 ρ θ Year
6.3 7.5 8.3" 145° 2018
70mm f/5.7, 22x
Well separated at 22x, but relatively close together with a noticeable difference in brightness. At 57x the primary component looked slightly yellowish, the companion rather gray-blueish.

STF2990 (**)

Name: STF2990
Type: **
Constellation: Peg
Coordinates: 23h13m17.60s / +22°05'00.70"

Components:
m1 m2 ρ θ Year
AB 8.9 9.0 2.6" 56° 2016
70mm f/5.7, 100x
Rather faint, because I observed from the sidewalk with present moon. Well split with equally bright components.

STF3042 (**)

Name: STF3042
Type: **
Constellation: And
Coordinates: 23h51m52.40s / +37°53'28.40"

Components:
m1 m2 ρ θ Year
7.6 7.8 5.8" 87° 2017
55mm f/9.1, 25x, Bortle 7, SQM-L 19.0
Split, tight, nearly equally bright.

STF3044 (**)

Name: STF3044
Type: **
Constellation: Peg
Coordinates: 23h52m59.94s / +11°55'27.40"

Components:
m1 m2 ρ θ Year
7.3 7.9 18.7" 283° 2017
70mm f/5.7, 22x
At 22x easy to separate with small difference in brightness. A color difference was noticeable. One component looked white-blueish, the other slightly orange. However, the colors changed again and again between the components. Even at 44x the color impression remained the same.

STF3049 (**)

Name: STF3049, sigma Cas, 8 Cas
Type: **
Constellation: Cas
Coordinates: 23h59m00.53s / +55°45'17.80"

Components:
m1 m2 ρ θ Year
AB 5.0 7.2 3.1" 326° 2017
AC 5.0 10.4 106.0" 66° 2014
70mm f/5.7, 120x, Bortle 6-
AB: At 57x barely separated, where the B component appears as a faint tiny star. At 120x the B component is clearly visible and slightly elongated on the first diffraction ring of the primary component. Very fine.

../sketches/2019-08-25_sigma_cas.jpg

STF3050 (**)

Name: STF3050
Type: **
Constellation: And
Coordinates: 23h59m29.33s / +33°43'26.90"

Components:
m1 m2 ρ θ Year
AB 6.5 6.7 2.5" 342° 2018
55mm f/9.1, 83x, Bortle 6, NELM 5.0+, SQM-L 19.1
At 83x seen as '8'. From 100x to 166x seen as '8', temporarily visible with space between.

70mm f/5.7, 100x
Wonderful double star. Easy to split with slight difference in brightness.

STF3053 (**)

Name: STF3053
Type: **
Constellation: Cas
Coordinates: 00h02m36.08s / +66°05'56.30"

Components:
m1 m2 ρ θ Year
AB 6.0 7.2 15.2" 71° 2018
63mm f/13.3, 46x
Easy to split with noticeable difference in brightness. Brighter component appeared slightly orange, fainter one bluish.

STF3062 (**)

Name: STF3062, V640 Cas
Type: **
Constellation: Cas
Coordinates: 00h06m15.81s / +58°26'12.50"

Components:
m1 m2 ρ θ Year
6.4 7.3 1.5" 2018
152mm f/5.9, 129x
Nice view, clearly split, but tight with visible difference in brightness.

STF3127 (**)

Name: STF3127, delta Her, 65 Her
Type: **
Constellation: Her
Coordinates: 17h15m01.92s / +24°50'22.50"

Components:
m1 m2 ρ θ Year
AB 3.1 8.3 12.7" 288° 2013
102mm f/11, 86x, Bortle 6
Easy. Pretty wide apart with large difference in brightness.

../sketches/2019-06-23_delta_her.jpg

STFA1 (**)

Name: STFA1
Type: **
Constellation: And
Coordinates: 00h46m24.34s / +30°56'33.50"

Components:
m1 m2 ρ θ Year
AB 7.2 7.4 48.0" 46° 2017
B 40mm, 8x, Bortle 7, SQM-L 19.0
Large distance with visible difference in brightness. I used a tripod.

STFA7 (**)

Name: STFA7
Type: **
Constellation: Tau
Coordinates: 03h31m03.47s / +27°43'53.60"

Components:
m1 m2 ρ θ Year
AB 7.4 7.8 44.1" 234° 2017
120mm f/5, 18x, Bortle 6-, NELM 4.8+, SQM-L 19.1
Well split with noticeable difference in brightness. Nice view together with the double star STF401 located southeast.

STFA19 (**)

Name: STFA19, 84 Leo, tau Leo
Type: **
Constellation: Leo
Coordinates: 11h27m56.23s / +02°51'22.50"

Components:
m1 m2 ρ θ Year
AB 5.0 7.5 88.5" 182° 2018
55mm f/9.1, 16x, Bortle 6, SQM-L 19.5
Wonderful double with slight color contrast in a very nice field. Together with 83 Leo stunning view. Noticeable unequal. A appeared white-yellowish with a hint of orange, B gray-bluish.

../sketches/2019-03-09_83_leo_tau_leo.jpg

STFA24 (**)

Name: STFA24
Type: **
Constellation: CVn
Coordinates: 13h10m03.27s / +38°29'55.90"

Components:
m1 m2 ρ θ Year
AB 6.0 6.3 275.6" 296° 2012
This double star contains of the components 15 and 17 CVn.

B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.2
Both components similar in brightness with large distance.

STFA35 (**)

Name: STFA35, nu 1/2 Dra, 24/25 Dra
Type: **
Constellation: Dra
Coordinates: 17h32m15.88s / +55°10'22.10"

Components:
m1 m2 ρ θ Year
4.9 4.9 62.1" 311° 2017
102mm f/11, 28x
Wide, bright, equal pair. Both components looked cream-white. Due to the distance a double for binoculars.

STFA50 (**)

Name: STFA50, omicron Cyg, 30 Cyg, 31 Cyg
Type: **
Constellation: Cyg
Coordinates: 20h13m37.90s / +46°44'28.80"

Components:
m1 m2 ρ θ Year
AD 3.9 4.8 336.7" 322° 2016
AC 3.9 7.0 108.6" 173° 2016
naked eye, Bortle 6+, SQM-L 19.4
AD: Well split with noticeable difference in brightness.

B 40mm, 8x, Bortle 6-, NELM 5.0
AD: Wonderful double star for binoculars. Large distance of the components, brighter once (31 Cyg) appeared slightly orange, the fainter (Cyg 30) more bluish.

B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 18.6
AC: Observation at full moon. Easily split with big difference in brightness. Brighter component slightly orange. C component rather faint.

80mm f/6.25, 25x, Bortle 7, NELM 5.0, SQM-L 18.6
AC: Similar to the observation with binoculars. C component appeared bluish and gave good contrast to the orange colored 31 Cyg.

102mm f/11, 28x, Bortle 6+, SQM-L 19.4
Bright, wide apart and wonderful contrast in color. A: light yellowish-orange, C: blue, D: light blue.

../sketches/2019-08-22_omicron_cyg.jpg

STT174 (**)

Name: STT174
Type: **
Constellation: Lyn
Coordinates: 07h35m56.00s / +43°01'51.40"

Components:
m1 m2 ρ θ Year
6.6 8.3 1.9" 92° 2017
70mm f/5.7, 133x
The obviously fainter component could be permanently seen in the right position angle as brightening on the first diffraction ring.

STT179 (**)

Name: STT179, kappa Gem, 77 Gem
Type: **
Constellation: Gem
Coordinates: 07h44m26.87s / +24°23'53.30"

Components:
m1 m2 ρ θ Year
3.7 10.0 7.2" 241° 2014
70mm f/5.7, 133x
Observation at nearly full moon: Fainter companion was not visible.

120mm f/5, 200x, Bortle 6-, SQM-L 18.9
Although the optics were not yet completely cooled down, the fainter component could be seen slightly outside the first diffraction ring as a tiny star in moments of steady air.

STT215 (**)

Name: STT215
Type: **
Constellation: Leo
Coordinates: 10h16m16.05s / +17°44'24.60"

Components:
m1 m2 ρ θ Year
7.2 7.5 1.5" 176° 2018
70mm f/5.7, 133x
Appeared partly separated, partly as '8'. Brightness seemed to be equal.

STT298 (**)

Name: STT298
Type: **
Constellation: Boo
Coordinates: 15h36m02.22s / +39°48'08.90"

Components:
m1 m2 ρ θ Year
AB-C 6.9 7.8 120.4" 328° 2017
102mm f/11, 28x
Wide, moderately unequal pair. Little difference in color: Primary components appeared a bit more orange colored.

120mm f/5, 23x, Bortle 6, NELM 5.0+, SQM-L 19.4
Easy to split with large angular distance and noticeable difference in brightness.

STT312 (**)

Name: STT312, eta Dra, 14 Dra
Type: **
Constellation: Dra
Coordinates: 16h23m59.51s / +61°30'50.70"

Components:
m1 m2 ρ θ Year
AB 2.8 8.2 4.4" 143° 2015
70mm f/5.7, 133x, Bortle 4, SQM-L 20.9
Not split in any way.

102mm f/11, 160x, Bortle 6, SQM-L 19.4
Easy. Very large difference in brightness. The faint companion appeared as a tiny star outside the first diffraction ring of the primary component. Highly recommended, especially with the nearby double star STF 2054!

../sketches/2019-06-25_eta_dra.jpg

STT386 (**)

Name: STT386
Type: **
Constellation: Cyg
Coordinates: 19h48m16.51s / +37°09'37.50"

Components:
m1 m2 ρ θ Year
8.5 8.6 0.9" 70° 2018
152mm f/5.9, 270x, Bortle 6-
Clearly visible as a double star with touching diffraction disks. Not difficult.

STT403 (**)

Name: STT403
Type: **
Constellation: Cyg
Coordinates: 20h14m21.53s / +42°06'15.60"

Components:
m1 m2 ρ θ Year
AB 7.3 7.6 1.0" 171° 2016
152mm f/5.9, 270x, Bortle 6
At 129x clearly elongated with constriction. At 270x clearly split, but very tight with almost touching diffraction disks. Visible, but very small difference in brightness. Inconspicuous color.

STT410 (**)

Name: STT410
Type: **
Constellation: Cyg
Coordinates: 20h39m33.31s / +40°34'46.80"

Components:
m1 m2 ρ θ Year
AB 6.7 6.8 0.9" 2018
AB-C 6.8 8.7 68.2" 69° 2013
AB-D 6.8 10.0 105.9" 327° 2013
152mm f/5.9, 270x, Bortle 6-
All four components easily visible. The pair AB shows two clear, equally bright, overlapping diffraction disks.

../sketches/2019-09-06_stt410.jpg

STT413 (**)

Name: STT413, 54 Cyg, lambda Cyg
Type: **
Constellation: Cyg
Coordinates: 20h47m24.53s / +36°29'26.70"

Components:
m1 m2 ρ θ Year
AB 4.7 6.3 0.9" 2018
102mm f/11, 280x, Bortle 6, SQM-L 19.4
The diffraction disk of the primary component was slightly elongated towards north. The air here was however a bit too unsteady for an accurate observation.

152mm f/5.9, 300x, Bortle 6, SQM-L 19.3
The fainter component was visible as a permanent brightening of the first diffraction ring.

STT426 (**)

Name: STT426, 60 Cyg
Type: **
Constellation: Cyg
Coordinates: 21h01m10.93s / +46°09'20.80"

Components:
m1 m2 ρ θ Year
5.4 9.5 2.9" 159° 2017
152mm f/5.9, 129x, Bortle 6
Much fainter companion outside of first diffraction ring. Better visible at 270x.

STT437 (**)

Name: STT437
Type: **
Constellation: Cyg
Coordinates: 21h20m50.12s / +32°27'10.20"

Components:
m1 m2 ρ θ Year
AB 7.2 7.4 2.4" 20° 2018
70mm f/5.7, 57x, Bortle 6-
At 57x separated, but close together. Near, slightly brighter star in nice contrast. The double star shows a distinct orange coloration. At 100x small difference in brightness visible.

STT545 (**)

Name: STT545, 37 Aur, theta Aur
Type: **
Constellation: Aur
Coordinates: 05h59m43.24s / +37°12'45.90"

Components:
m1 m2 ρ θ Year
AB 2.6 7.2 4.2" 305° 2017
70mm f/5.7, 57x
At 57x nothing seen at first sight. At 133x the much fainter component was visible after a short time as a tiny star in the correct position angle. With this knowledge, the observation at 57x was also successful, even if one has to look very closely. The challenge here is not so much the angular distance as the large difference in brightness.

STTA11 (**)

Name: STTA11
Type: **
Constellation: And
Coordinates: 01h07m09.16s / +38°39'01.70"

Components:
m1 m2 ρ θ Year
AB-C 7.6 8.8 59.3" 164° 2014
152mm f/5.9, 22x, Bortle 6, SQM-L 19.3
Pretty wide pair with moderate difference in brightness. At 69x the primary component appeared slightly orange, BC rather grayish.

STTA17 (**)

Name: STTA17, BKO10
Type: **
Constellation: And
Coordinates: 01h24m30.85s / +39°01'30.30"

Components:
m1 m2 ρ θ Year
STTA17 AB 8.0 9.8 35.4" 101° 2015
STTA17 AC 8.0 8.5 134.9" 347° 2014
STTA17 CD 8.5 9.8 68.9" 279° 2015
STTA17 CE 8.5 13.3 81.2" 14° 2015
BKO10 AF 8.0 11.2 141.7" 270° 2015
152mm f/5.9, 22x, Bortle 6, SQM-L 19.3
The components A-D and F easily visible as a rather conspicuous group with comparatively large distances. I didn't pay attention to the component E. No brighter stars in the immediate vicinity. The pair AB and CD are very similar; CD a bit wider with opposite position angle. Very nice multiple star also for smaller telescopes.

SZ Cam (**)

Name: SZ Cam, STF485
Type: **
Constellation: Cam
Coordinates: 04h07m51.38s / +62°19'48.40"

Components:
m1 m2 ρ θ Year
AE 6.9 6.9 18.0" 306° 2018
B 40mm, 8x, Bortle 6, NELM 5.0+
Split, but very tight with equally bright components. I used a tripod.

70mm f/5.7, 15x, Bortle 4-, SQM-L 20.9
Easily split with nearly equally bright components. Located in the center of the open cluster NGC1502. Very nice view.

WNC2 (**)

Name: WNC2
Type: **
Constellation: Ori
Coordinates: 05h23m51.32s / -00°51'59.80"

Components:
m1 m2 ρ θ Year
A-BC 6.9 7.0 3.2" 159° 2018
70mm f/5.7, 44x, Bortle 6, SQM-L 19.2
Double star appeared elongated.

120mm f/5, 150x, Bortle 6, SQM-L 19.2
Clearly split with nearly equally bright components.

WZ Cas (**)

Name: WZ Cas, STTA254
Type: **
Constellation: Cas
Coordinates: 00h01m15.85s / +60°21'19.00"

Components:
m1 m2 ρ θ Year
AB 7.4 8.3 58.0" 89° 2017
80mm f/6.25, 33x, Bortle 8, NELM 4.3+, SQM-L 18.9
Nice double star. Brighter component appeared orange, the fainter more bluish.

102mm f/11, 28x, Bortle 6+, SQM-L 19.4
Splendid view. Primary component clearly orange, secondary blue.

../sketches/2019-08-22_wz_cas.jpg

zeta Psc (**)

Name: zeta Psc, 86 Psc, STF100
Type: **
Constellation: Psc
Coordinates: 01h13m43.80s / +07°34'31.80"

Components:
m1 m2 ρ θ Year
AB 5.2 6.3 22.8" 64° 2018
8" f/6, 37x, Bortle 4-, NELM 5.7+, SQM-L 20.8
Visually evident as double star and easy to find. Well split with slight difference in brightness.