- Sketches (Deepsky) (Lyr) -

And (1) Cas (5) Cyg (7) Her (4) Lyr (5) Sex (1)
Aur (4) Cnc (4) Dra (5) Leo (12) Ori (2) Tau (1)
Boo (2) Com (2) Eri (1) LMi (3) Per (6) Tri (1)
Cam (4) CVn (7) Gem (8) Lyn (9) Psc (1) UMa (10)

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 3m6 6m7 45.7" 149° 2017
BU293 AE 3m6 10m1 67.2" 317° 2015
BU293 AF 3m6 10m6 86.0" 18° 2015
Robert Zebahl
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

epsilon Lyr (**)

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

Components:
m1 m2 ρ θ Year
STFA37 AB-CD 4m7 4m6 209.5" 172° 2016
STFA37 AI 5m2 10m1 149.5" 137° 2015
STF2382, 4 Lyr, epsilon 1 Lyr AB 5m2 6m1 2.2" 346° 2018
STF2383, 5 Lyr, epsilon 2 Lyr CD 5m2 5m4 2.4" 75° 2018

../images/binary-star-orbits/STF2382-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STF2382-AB-orbit-solution-2.jpg ../images/binary-star-orbits/STF2383-CD-orbit.jpg

Robert Zebahl
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

M 57 (PN)

../dss/dss2blue_185335.08_+330145.03_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: M57, NGC6720, PK63+13.1, Ring Nebula
Type: PN
Constellation: Lyr
Coordinates: 18h53m35.08s / +33°01'45.03"
Brightness / Size: 8m8 / 1.4x1.0'
Robert Zebahl
B 8x40, Bortle 6-, NELM 5m3, SQM-L 19.3
Quite faint, stellar. Anything but obvious.

MODERATE
B 8x40, Bortle 5, NELM 5m5
Stellar. Fairly well seen with averted vision. Detailed finder chart is highly recommended due to similarly bright stars in the surrounding!

MODERATE
B 16x70, Bortle 7, SQM-L 18.6
Immediately apparent as a small, roundish, homogeneous nebula. Well distinguishable from the surrounding stars.

EASY
55mm f/9.1, 40x, Bortle 6, NELM 5m0+, SQM-L 19.3
Immediately apparent at 40x, slightly oval with slightly darker center. At 90x recognizable as ring, slightly oval with obviously darker center, long sides slightly brighter.

EASY
80mm f/6.25, 33x, Bortle 5, NELM 5m8, SQM-L 20.7
Oval shape. Darkening toward the middle with averted vision.

EASY
102mm f/11, 125x, Bortle 6, SQM-L 19.5

../sketches/2019-07-27_m57.jpg

EASY
4.5" f/8, 28x, Bortle 7+
At 28x evident and obviously extended, slightly oval. Darkening toward the middle nearly perceptible. Appeared at 75x as a wreath of smoke like a coffee bean.

EASY
8" f/6, 80x, Bortle 6+, NELM 5m3, SQM-L 19.7
Oval ring, like a coffee bean. Longer sides a bit wider & brighter.

EASY
René Merting
B 8x20, SQM-L 21.5
der PN ist direkt knapp stellar sichtbar, indirekt eindeutiger - er bildet ein flaches Dreieck mit zwei Sternen nördlich

MODERATE
B 10x50, SQM-L 21.5
der PN ist direkt deutlich zu erkennen, er wirkt leicht flächig bzw. die Helligkeit wirkt auf eine größere Fläche verteilt, als bei einem Stern üblich

EASY
B 12x50, SQM-L 21.5
leicht identifizierbar, ein kleines, diffuses Scheibchen - der PN bildet ein flaches Dreieck mit zwei Sternen nördlich von ihm

EASY
B 16x70, SQM-L 21.5
auffällig - kleines homogen helles Scheibchen (deutlich über den Quasi-Sternstatus hinausgehend) - gut abgegrenzt

EASY
B 18x70, SQM-L 21.0
ein kleiner, kompakter Nebelball - rund, gut begrenzt und homogen hell

EASY
100mm f/6.4, 160x, SQM-L 21.5
bei 32x schwebt der PN wunderschön im Raum zwischen den beiden südlichen Kastensternen, die noch ins Gesichtsfeld passen - er ist leicht oval erkennbar mit gut begrenzten Rändern - im Inneren wirkt er ein wenig dunkler - bei 71x wird die ovale Ringstruktur deutlich erkennbar - bei 160x zeigt sich das dunklere Innere homogen hell

EASY
8" f/4, 133x, SQM-L 21.5
bei 25x zeigt sich ein gut definierter homogen heller Nebelball - bei 62x wird dann der charakteristische Rauchring deutlich, der sich bei 133x elongiert zeigt (OW-Elongation) - bei 267x setzt sich der Rand hell und deutlich vom Inneren ab

EASY
12.5" f/4.5, 72x, SQM-L 21.5
bei 72x eindrucksvoll und am schönsten - höhere Vergrößerungen sind auch schön, mit deutlich dunklerem aber nicht strukturierten Zentralbereich
EASY

STF 2349 (**)

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

Components:
m1 m2 ρ θ Year
AB 5m4 9m4 7.2" 204° 2016
Robert Zebahl
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

STF 2474 (**)

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

Components:
m1 m2 ρ θ Year
AB 6m8 7m9 15.9" 264° 2018
Robert Zebahl
B 16x70, Bortle 7, SQM-L 18.6
2020-07-06: Striking with well visible brightness difference. Very nice together with STF2470, which gives a similar view. A double-double for binoculars.

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