- Complete Object List (Boo) -

And (155) Cep (81) Cyg (152) Leo (169) Peg (163) Sgr (30)
Aql (60) Cet (28) Del (25) Lep (7) Per (98) Tau (35)
Aqr (16) CMa (8) Dra (93) Lib (2) Psc (71) Tri (59)
Ari (44) CMi (9) Equ (10) LMi (38) Pup (12) UMa (243)
Aur (69) Cnc (76) Eri (5) Lyn (87) Sco (4) UMA (1)
Boo (41) Com (144) Gem (93) Lyr (44) Sct (19) UMi (7)
Cam (79) CrB (36) Her (74) Mon (32) Ser (28) Vir (162)
Cap (5) Crv (3) Hya (15) Oph (18) Sex (17) Vul (35)
Cas (115) CVn (116) Lac (34) Ori (54) Sge (12)

Arp 90 (GLXGRP)

../dss/dss2blue_152607.00_+414034.00_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: Arp90
Type: GLXGRP
Constellation: Boo
Coordinates: 15h26m07.00s / +41°40'34.00"

Group Members:
NGC5929 (UGC9851) b13m0 0.9x0.8' (90°)
NGC5930 (UGC9852, H2.651) b13m0 1.8x0.8' (30°)
René Merting
8" f/4, 133x, SQM-L 21.5
NGC 5929 und NGC 5930 sind bei 40x ist indirekt als zarter Schimmer erkennbar, dieser Hauch kann mitunter länger gehalten werden - bei 114x ist der Nebelfleck dann direkt sichtbar - er ist homogen hell mit diffusen Außenbereichen - bei 133x nehmen beide zusammen eine leicht ovale Form an - beide Galaxien konnten in keiner Vergrößerung getrennt voneinander gesehen werden
MODERATE

Arp 199 (GLXGRP)

../dss/dss2blue_141704.00_+363430.00_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: Arp199
Type: GLXGRP
Constellation: Boo
Coordinates: 14h17m04.00s / +36°34'30.00"

Group Members:
NGC5544 (UGC9142, H2.419) b13m2 0.9x0.9'
NGC5545 (UGC9143) b14m0 1.0x0.3' (58°)
Robert Zebahl
8" f/6, 150x, Bortle 4, SQM-L 21.0
At first glance both galaxies appeared as elongated, evenly bright nebula. NGC5545 hardly separated from NGC5544 and appeared elongated. NGC5545 was roundish and also not easy to separate. Overall pretty faint.
MODERATE

BD+47 2234 (*)

Name: BD+47 2234
Type: *
Constellation: Boo
Coordinates: 15h30m39.79s / +46°51'31.27"
Brightness: 9m7
Robert Zebahl
120mm f/5, 48x, Bortle 6, NELM 5m0+, SQM-L 19.4
Despite the color index no color was seen at 23x and 48x.

IC 1029 (GLX)

../dss/dss1_143227.21_+495417.16_5_web.jpg
Image source: DSS I - 5×5'
Name: IC1029, UGC9361
Type: GLX
Constellation: Boo
Coordinates: 14h32m27.21s / +49°54'17.16"
Brightness / Size: 12m7 / 2.8x0.4'
René Merting
12.5" f/4.5, 111x, SQM-L 21.5
bei 72x ist die Galaxie 3:1 elongiert erkennbar, so manche der Superthins hat nicht so toll ausgesehen - bei 111x ist das hellere Zentrum länglich sichtbar
EASY

mu Boo (**)

Name: mu Boo, 51 Boo, Alkalurops
Type: **
Constellation: Boo
Coordinates: 15h24m29.54s / +37°22'37.10"

Components:
m1 m2 ρ θ Year
CHR181, mu 1 Boo Aa-Ab 4m3 None 0.1" 188° 2012
STFA28, mu 1 Boo AB 4m3 7m1 109.0" 172° 2018
STF1938, mu 2 Boo Ba-Bb 7m1 7m6 2.3" 2019

../images/binary-star-orbits/CHR181-Aa-Ab-orbit.jpg ../images/binary-star-orbits/STF1938-Ba-Bb-orbit.jpg

Robert Zebahl
B 8x40, Bortle 7, NELM 5m0, 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: grey.

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 5m0+, SQM-L 19.4
STFA28 (AB): Easy to split with large angular distance and noticeable difference in brightness.

NGC 5466 (GC)

../dss/dss2blue_140527.29_+283204.00_10_web.jpg
Image source: DSS II (blue) - 10×10'
Name: NGC5466, H6.9
Type: GC
Constellation: Boo
Coordinates: 14h05m27.29s / +28°32'04.00"
Brightness / Size: 9m1 / 9.2x9.2'
Robert Zebahl
8" f/6, 37x, Bortle 4
Quite large but faint and diffuse. Not resolvable. At 133x barely visible with direct vision.

MODERATE
René Merting
B 10x50, SQM-L 21.5
der KS ist knapp westlich von einem hellen Stern erkennbar - indirekt zeigt er sich als großflächiger, gleichmäßig heller, matter Schimmer

MODERATE
B 18x70, SQM-L 21.5
indirekt ein großer, schwacher, matter Nebelfleck erkennbar - homogen hell - direkt knapp sichtbar

EASY
100mm f/6.4, 91x, SQM-L 21.5
bei 32x wirkt der KS wie eine matt leuchtende schwache Galaxie - homogen hell - indirekt ist er besser sichtbar - bei 71x wirkt der KS im SO ein wenig abgeflacht, Konturen sind keine erkennbar

EASY
12.5" f/4.5, 160x, SQM-L 21.5
bei 45x ist der KS als homogen heller zart granulierter Nebel erkennbar - extrem fein, sieht klasse aus - bei 72x werden erste Sterne sichtbar, NGC 5466 bleibt fein und gleichmäßig hell - er wirkt ein wenig angefranst und besonders nach Süden sind ein paar mehr Einzelsterne sichtbar - auffallend im Süden ist eine nach SO gebogene Sternkette - bei 160x zeigen sich im Haufen viele Sterne - einige bilden Ketten und imitieren Spiralarme, die sich gegen dem Uhrzeigersinn drehen - der Haufen strahlt wie eine Flimmerkiste
EASY

NGC 5497 (GLX)

../dss/dss2red_141031.62_+385336.84_5_web.jpg
Image source: DSS II (red) - 5×5'
Name: NGC5497, UGC9069
Type: GLX
Constellation: Boo
Coordinates: 14h10m31.62s / +38°53'36.84"
Brightness / Size: 14m1 / 1.2x0.7'
Robert Zebahl
8" f/6, 150x, Bortle 4 FAILED

NGC 5529 (GLX)

../dss/dss2blue_141534.23_+361337.12_6_web.jpg
Image source: DSS II (blue) - 6×6'
Name: NGC5529, UGC9127, H3.414
Type: GLX
Constellation: Boo
Coordinates: 14h15m34.23s / +36°13'37.12"
Brightness / Size: 11m9 / 6.0x0.7'
Robert Zebahl
8" f/6, 80x, Bortle 4, SQM-L 21.2
Very thin, elongated with tapering endings, rather evenly bright.

MODERATE
René Merting
12.5" f/4.5, 160x, SQM-L 21.5
bei 72x ist direkt ein zarter schmaler Strich sichtbar - indirekt besehen beträgt die Ausdehnung 5:1 - die Galaxie ist gleichmäßig hell und gut definiert - bei 111x und 160x zeigt sich das Zentrum länglich und etwas heller - östlich der Galaxie fallen drei gleichhelle Sterne auf, die sehr eng in einer SO-NW-ausgerichteten Reihe stehen - bis dahin reicht die Galaxie nicht - ich habe das Gefühl, dass in der Galaxie ein separater heller Streifen sichtbar ist - schönes Exemplar
EASY

NGC 5533 (GLX)

../dss/dss2blue_141607.71_+352037.38_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5533, UGC9133, H2.418
Type: GLX
Constellation: Boo
Coordinates: 14h16m07.71s / +35°20'37.38"
Brightness / Size: 11m9 / 3.1x1.9'
Robert Zebahl
8" f/6, 96x, Bortle 5
Faint, roundish, slight brightening toward the middle.
MODERATE

NGC 5544 (GLX)

../dss/dss2blue_141702.63_+363415.90_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5544, UGC9142, H2.419
Group: Arp199
Type: GLX
Constellation: Boo
Coordinates: 14h17m02.63s / +36°34'15.90"
Brightness / Size: b13m2 / 0.9x0.9'
Robert Zebahl
8" f/6, 150x, Bortle 4, SQM-L 21.0
Roundish, hard to separate from NGC5545.
MODERATE

NGC 5545 (GLX)

../dss/dss2blue_141705.22_+363430.87_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5545, UGC9143
Group: Arp199
Type: GLX
Constellation: Boo
Coordinates: 14h17m05.22s / +36°34'30.87"
Brightness / Size: b14m0 / 1.0x0.3'
Robert Zebahl
8" f/6, 150x, Bortle 4, SQM-L 21.0
Elongated brightening, very hard to separate from NGC5544.
MODERATE

NGC 5557 (GLX)

../dss/dss2blue_141825.71_+362937.28_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5557, UGC9161, H1.99
Type: GLX
Constellation: Boo
Coordinates: 14h18m25.71s / +36°29'37.28"
Brightness / Size: 11m0 / 2.4x1.9'
Robert Zebahl
8" f/6, 80x, Bortle 4, SQM-L 21.0
Roundish, getting much more brighter towards the middle. Well visible with direct vision.

EASY
René Merting
B 18x70, SQM-L 21.5
indirekt als schwacher, diffuser Schimmer südöstlich eines schwachen Sterns erkennbar - sie blitzt nur ab und an auf

DIFFICULT
12.5" f/4.5, 160x, SQM-L 21.5
X-Rated Galaxy - NGC 5557 ist bei 45x als kleiner kompakter schwacher Nebel sichtbar - bei 72x zeigen sich die Ränder leicht diffus und die Galaxie wird zur Mitte hin heller - bei 160x ist indirekt eine stellare Aufhellung am ostsüdöstlichen Rand erkennbar - das Zentrum wirkt unregelmäßig, ja fast dreieckig und leicht nach Osten verlagert - bei 240x läuft die Galaxie nach Norden diffuser aus
EASY

NGC 5580 (GLX)

../dss/dss2blue_142138.42_+351217.86_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5580, NGC5590, UGC9200, H3.417
Type: GLX
Constellation: Boo
Coordinates: 14h21m38.42s / +35°12'17.86"
Brightness / Size: 12m3 / 1.8x1.8'
Robert Zebahl
8" f/6, 96x, Bortle 5
Roundish, fairly compact, brightening toward the middle.
MODERATE

NGC 5614 (GLX)

../dss/dss2blue_142407.59_+345132.02_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5614, UGC9226, H2.420
Type: GLX
Constellation: Boo
Coordinates: 14h24m07.59s / +34°51'32.02"
Brightness / Size: 11m7 / 2.4x2.0'
Robert Zebahl
8" f/6, 96x, Bortle 5
Round, brightening toward the middle. Easily seen with averted vision.
EASY

NGC 5615 (GLX)

../dss/dss2blue_142406.40_+345154.00_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5615
Type: GLX
Constellation: Boo
Coordinates: 14h24m06.40s / +34°51'54.00"
Brightness / Size: 14m7 / 0.4x0.4'
Robert Zebahl
8" f/6, 171x, Bortle 5 FAILED

NGC 5660 (GLX)

../dss/dss2blue_142949.80_+493721.40_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5660, UGC9325, H2.695
Type: GLX
Constellation: Boo
Coordinates: 14h29m49.80s / +49°37'21.40"
Brightness / Size: 11m9 / 2.7x2.6'
Robert Zebahl
8" f/6, 100x, Bortle 4
Relatively faint, roundish. Already seen at 37x. At 100x slightly brighter core.

EASY
René Merting
12.5" f/4.5, 111x, SQM-L 21.5
bei 45x springt die Galaxie gleich ins Auge zusammen mit NGC 5676 - sie muss gegen den nordwestlich stehenden 5m6 hellen Stern 24 Bootis ankämpfen - bei 72x leicht Helligkeitszunahme zur Mitte hin erkennbar - bei 111x wirkt die Galaxie wie ein kleiner Softball
EASY

NGC 5676 (GLX)

../dss/dss2blue_143246.85_+492728.11_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5676, UGC9366, H1.189
Type: GLX
Constellation: Boo
Coordinates: 14h32m46.85s / +49°27'28.11"
Brightness / Size: 11m2 / 3.9x1.8'
Robert Zebahl
8" f/6, 37x, Bortle 4
Fairly bright, oval. At 100x slight brightening toward the middle.

EASY
René Merting
12.5" f/4.5, 111x, SQM-L 21.5
bei 45x springt die Galaxie gleich ins Auge zusammen mit NGC 5660 - NGC 5676 zeigt sich 2:1 elongiert - bei 72x wirkt sie deutlich heller als NGC 5660 - ein schönes Ellipsoid, zur Mitte leicht heller werdend - bei 111x längliches Zentrum, das nach Norden etwas heller wirkt
EASY

NGC 5689 (GLX)

../dss/dss2blue_143529.67_+484429.37_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5689, UGC9399, H1.188
Type: GLX
Constellation: Boo
Coordinates: 14h35m29.67s / +48°44'29.37"
Brightness / Size: 11m9 / 3.3x1.0'
Robert Zebahl
8" f/6, 100x, Bortle 4
At 37x fairly small, elongated, relatively thin. Can be easily overlooked. At 100x very elongated with brighter core, spindel-shaped.
EASY

NGC 5857 (GLX)

../dss/dss2blue_150727.32_+193551.24_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5857, UGC9724, H2.751
Type: GLX
Constellation: Boo
Coordinates: 15h07m27.32s / +19°35'51.24"
Brightness / Size: 13m1 / 1.2x0.6'
Robert Zebahl
8" f/6, 200x, Bortle 4
Nearly permanently held with averted vision as nearly evenly bright, round nebula.
DIFFICULT

NGC 5859 (GLX)

../dss/dss2blue_150734.75_+193456.21_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5859, UGC9728, H2.752
Type: GLX
Constellation: Boo
Coordinates: 15h07m34.75s / +19°34'56.21"
Brightness / Size: 12m5 / 3.0x0.8'
Robert Zebahl
8" f/6, 200x, Bortle 4
Nearly permanently held with averted vision as evenly bright, very elongated nebula.
DIFFICULT

NGC 5929 (GLX)

../dss/dss2blue_152606.16_+414014.40_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5929, UGC9851
Group: Arp90
Type: GLX
Constellation: Boo
Coordinates: 15h26m06.16s / +41°40'14.40"
Brightness / Size: b13m0 / 0.9x0.8'
René Merting
8" f/4, 133x, SQM-L 21.5
bei 40x ist indirekt ein zarter Schimmer erkennbar, dieser Hauch kann mitunter länger gehalten werden - bei 114x ist der Nebel dann direkt sichtbar - er ist homogen hell mit diffusen Außenbereichen - bei 133x nimmt der Nebel eine leicht ovale Form an - NGC 5929 und 5930 konnten in keiner Vergrößerung getrennt voneinander gesehen werden
MODERATE

NGC 5930 (GLX)

../dss/dss2blue_152608.00_+414033.69_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: NGC5930, UGC9852, H2.651
Group: Arp90
Type: GLX
Constellation: Boo
Coordinates: 15h26m08.00s / +41°40'33.69"
Brightness / Size: b13m0 / 1.8x0.8'
René Merting
8" f/4, 133x, SQM-L 21.5
bei 40x wird indirekt ein zarter Schimmer erkennbar, dar Hauch kann auch länger gehalten werden - bei 114x ist der Nebel dann direkt sichtbar - er ist homogen hell mit diffusen Außenbereichen sichtbar - bei 133x nimmt der Nebel eine leicht ovale Form an - NGC 5929 und 5930 konnten in keiner Vergrößerung getrennt voneinander gesehen werden
MODERATE

S 656 (**)

Name: S656
Type: **
Constellation: Boo
Coordinates: 13h50m23.51s / +21°16'35.80"

Components:
m1 m2 ρ θ Year
6m9 7m4 86.2" 209° 2018
Robert Zebahl
B 8x40
2020-04-05: Wide, medium bright pair. Primary component appeared slightly orange, the companion greyish. The double star is in close vicinity to the star 6 Boo, which shines in a pale orange.

70mm f/5.7, 22x, Bortle 6
2020-04-24: Widely separated with little difference in brightness. Both components appeared slightly yellowish. Standing close to 6 Boo, which also shines in a slight yellow.

SHJ 191 (**)

Name: SHJ191
Type: **
Constellation: Boo
Coordinates: 14h59m34.58s / +53°51'36.70"

Components:
m1 m2 ρ θ Year
6m9 7m6 40.4" 342° 2018
Robert Zebahl
B 8x40
2020-04-05: Easily separable with clearly visible difference in brightness. Nice separation of the components. Colors not perceptible.

55mm f/9.1, 27x
2020-04-05: Widely separated pair with rather small difference in brightness. Primary component: creamy white, companion: slightly orange.

70mm f/5.7, 22x, Bortle 6
2020-04-24: Widely separated with a moderate difference in brightness. Striking. The brighter component appeared yellowish-orange, the fainter one somehow darker and occasionally also cooler.

STF 1772 (**)

Name: STF1772, 1 Boo
Type: **
Constellation: Boo
Coordinates: 13h40m40.50s / +19°57'20.40"

Components:
m1 m2 ρ θ Year
AB 5m8 9m6 4.4" 134° 2017
AC 5m8 12m2 87.5" 26° 2015
AD 5m8 7m4 208.4" 2010
Robert Zebahl
70mm f/5.7, 22x, Bortle 6
AD: 2020-04-24: Very widely split with clearly visible difference in brightness. The primary component appeared white-yellowish, the companion pale orange.

STF 1821 (**)

Name: STF1821, kappa Boo, 17 Boo, Asellus Tertius
Type: **
Constellation: Boo
Coordinates: 14h13m29.00s / +51°47'23.80"

Components:
m1 m2 ρ θ Year
AB 4m5 6m6 13.7" 236° 2017

../images/binary-star-orbits/STF1821-AB-orbit.jpg

Robert Zebahl
70mm f/5.7, 22x, Bortle 6
2020-04-24: Clearly separated with significant difference in brightness. The primary component showed a pale yellowish-orange color with a greyish companion. To the southeast there is the double star STFA 26.

STF 1829 (**)

Name: STF1829
Type: **
Constellation: Boo
Coordinates: 14h15m27.95s / +50°26'24.60"

Components:
m1 m2 ρ θ Year
8m1 8m6 5.6" 151° 2019
Robert Zebahl
B 16x70, Bortle 6, SQM-L 19.2
2021-03-21: Clearly elongated, felt almost separated.

STF 1834 (**)

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

Components:
m1 m2 ρ θ Year
8m1 8m3 1.6" 104° 2018

../images/binary-star-orbits/STF1834-orbit.jpg

Robert Zebahl
120mm f/5, 150x, Bortle 6, NELM 5m0+, SQM-L 19.4
At 108x elongated, at 150x barely split with similarly bright components.

STF 1835 & BU 1111 (**)

Name: STF1835 & BU1111, WDS14234+0827
Type: **
Constellation: Boo
Coordinates: 14h23m22.74s / +08°26'47.90"

Components:
m1 m2 ρ θ Year
STF1835 A-BC 5m0 6m8 6.2" 196° 2018
BU1111 BC 7m4 7m7 0.3" 16° 2018

../images/binary-star-orbits/BU1111-BC-orbit.jpg

Robert Zebahl
102mm f/11, 62x
STF1835 (A-BC): At 28x barely split with visible difference in brightness. At 62x easy to separate. The colors seemed similar.

STF 1838 (**)

Name: STF1838
Type: **
Constellation: Boo
Coordinates: 14h24m05.76s / +11°14'49.10"

Components:
m1 m2 ρ θ Year
7m5 7m7 9.7" 335° 2017
Robert Zebahl
70mm f/5.7, 44x, Bortle 6
2020-04-24: At 22x small, fine and remarkable double star with small difference in brightness, at 44x with visible color difference: orange & white-bluish.

STF 1850 (**)

Name: STF1850
Type: **
Constellation: Boo
Coordinates: 14h28m33.29s / +28°17'25.90"

Components:
m1 m2 ρ θ Year
7m1 7m6 25.2" 263° 2018
Robert Zebahl
B 8x40
2020-04-05: Separated, but still quite close together with a moderate difference in brightness.

70mm f/5.7, 22x, Bortle 6
2020-04-24: Easily separated, medium bright with rather small difference in brightness and moderate distance. Fairly conspicuous. The components appeared white-yellowish and white-bluish. Beautiful double star.

STF 1864 (**)

Name: STF1864, pi 1 Boo
Type: **
Constellation: Boo
Coordinates: 14h40m43.56s / +16°25'05.90"

Components:
m1 m2 ρ θ Year
AB 4m9 5m8 5.4" 113° 2019
Robert Zebahl
70mm f/5.7, 31x, Bortle 6
2020-04-24: At 22x immediately visible as figure '8' with visible difference in brightness. Beside omicron Boo there are no other brighter stars in the nearer surroundings. At 31x cleanly split, but still close together with noticeable difference in brightness. Both components appear white. Beautiful sight. At 57x very nice with a slightly different color impression: white & dark yellow.

STF 1877 (**)

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

Components:
m1 m2 ρ θ Year
AB 2m6 4m8 2.8" 347° 2018
Robert Zebahl
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_epsilon_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, grey 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.

STF 1884 (**)

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

Components:
m1 m2 ρ θ Year
6m6 7m5 2.1" 58° 2019

../images/binary-star-orbits/STF1884-orbit.jpg

Robert Zebahl
102mm f/11, 86x
At 86x pretty tight and unequal. At 160x clearly split. A: white, B: slightly orange.

STF 1886 (**)

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

Components:
m1 m2 ρ θ Year
AB 7m6 9m7 7.9" 224° 2018
Robert Zebahl
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: greyish.

STF 1888 & ARN 11 (**)

Name: STF1888 & ARN11, xi Boo, 37 Boo
Type: **
Constellation: Boo
Coordinates: 14h51m23.38s / +19°06'01.70"

Components:
m1 m2 ρ θ Year
STF1888 AB 4m8 7m0 5.3" 300° 2018
STF1888 AC 4m8 13m8 71.3" 340° 2015
STF1888 AD 4m8 11m7 160.8" 286° 2015
ARN11 AE 4m8 8m7 271.5" 98° 2015
ARN11 AF 4m8 9m2 337.5" 37° 2015
STF1888 BC 7m0 13m8 63.9" 340° 2001
STF1888 BE 7m0 8m7 273.5" 102° 2009

../images/binary-star-orbits/STF1888-AB-orbit.jpg

Robert Zebahl
70mm f/5.7, 44x, Bortle 6
AB: 2020-04-24: Beautifully separated with quite a large difference in brightness in a lovely star field. The primary component shines yellowish with a faint companion.

STF 1890 (**)

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

Components:
m1 m2 ρ θ Year
6m3 6m7 2.5" 46° 2019

../images/binary-star-orbits/STF1890-orbit.jpg

Robert Zebahl
70mm f/5.7, 100x, Bortle 6, NELM 5m0+, SQM-L 19.4
2020-04-18: At 57x very finely separated with extremely tightly spaced components that appeared equally bright. At 100x a very nice pair with little difference in brightness. Fantastic sight! The color of the components was slightly different: creamy-white & a touch of yellow-orange.

70mm f/5.7, 67x, Bortle 6, SQM-L 19.2
2020-04-01: At 44x elongated, partly notched. 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.

STF 1910 (**)

Name: STF1910
Type: **
Constellation: Boo
Coordinates: 15h07m32.95s / +09°13'33.80"

Components:
m1 m2 ρ θ Year
7m3 7m5 3.9" 211° 2019
Robert Zebahl
70mm f/5.7, 44x, Bortle 6
2020-04-24: At 31x clearly visible as figure '8' and almost separated with similarly bright components. At 44x still very tight, but separated pair. Overall rather faint with little difference in brightness. The primary component appeared slightly yellowish-orange.

STFA 26 (**)

Name: STFA26, iota Boo, 21 Boo
Type: **
Constellation: Boo
Coordinates: 14h16m10.07s / +51°22'01.30"

Components:
m1 m2 ρ θ Year
AB 4m8 7m4 38.9" 33° 2017
Robert Zebahl
B 8x40
2020-04-05: Even with tripod the faint companion was not visible.

B 16x70, Bortle 6, SQM-L 19.2
2021-03-21: Very beautifully embedded in a group of bright and medium bright stars. Significant difference in brightness. Primary component appeared white-yellowish, the much fainter companion grey-bluish at best.

70mm f/5.7, 22x, Bortle 6
2020-04-24: Similar view to the northwest standing kappa Boo. Nicely separated with larger distance and fainter companion. The primary component appeared rather white.

STFA 27 (**)

Name: STFA27, delta Boo, 49 Boo
Type: **
Constellation: Boo
Coordinates: 15h15m30.16s / +33°18'53.40"

Components:
m1 m2 ρ θ Year
AB 3m6 7m9 105.0" 78° 2017
Robert Zebahl
70mm f/5.7, 22x, Bortle 6
2020-04-24: Widely separated pair with large difference in brightness. Less striking. The bright primary component shines in a bright yellow.

STT 298 (**)

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

Components:
m1 m2 ρ θ Year
AB 7m2 8m4 1.3" 187° 2017
AB-C 6m9 7m8 120.4" 328° 2017
AB-D 6m9 13m9 167.4" 224° 2002
AB-E 6m9 12m1 456.0" 335° 2002

../images/binary-star-orbits/STT298-AB-orbit.jpg

Robert Zebahl
102mm f/11, 28x
AB-C: Wide, moderately unequal pair. Little difference in color: Primary components appeared a bit more orange colored.

120mm f/5, 23x, Bortle 6, NELM 5m0+, SQM-L 19.4
AB-C: Easy to split with large angular distance and noticeable difference in brightness.