- Double Stars (Lyr) -

And (32) Cep (13) CVn (4) Her (13) Mon (1) Sex (2)
Aql (9) Cet (1) Cyg (19) Hya (4) Oph (1) Tau (11)
Ari (8) CMa (1) Del (2) Leo (19) Ori (8) Tri (4)
Aur (27) Cnc (10) Dra (8) Lib (1) Peg (16) UMa (24)
Boo (12) Com (8) Equ (5) LMi (6) Per (18) UMi (1)
Cam (10) CrB (4) Eri (1) Lyn (18) Psc (7) Vir (6)
Cas (17) Crv (1) Gem (19) Lyr (8) Ser (2)

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

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 2351 (**)

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

Components:
m1 m2 ρ θ Year
7m6 7m6 5.0" 160° 2019
Robert Zebahl
70mm f/5.7, 57x
Beautiful, little double star with equally bright components at a moderate distance.

STF 2461 (**)

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

Components:
m1 m2 ρ θ Year
AB 5m3 9m1 3.2" 281° 2017
Robert Zebahl
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.

STF 2470 (**)

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

Components:
m1 m2 ρ θ Year
7m0 8m4 13.8" 267° 2017
Robert Zebahl
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.

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
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

STT 525 & SHJ282 (**)

Name: STT525 & SHJ282, WDS18549+3358
Type: **
Constellation: Lyr
Coordinates: 18h54m52.52s / +33°58'06.90"

Components:
m1 m2 ρ θ Year
STT525 AB 6m1 9m1 1.8" 130° 2015
SHJ282 AC 6m1 7m6 45.4" 350° 2018
SHJ282 AD 6m1 11m0 214.8" 295° 2015
Robert Zebahl
70mm f/5.7, 22x, Bortle 6-, SQM-L 19.2
SHJ282 (AC): Fairly bright and wide pair. The double star was conspicuous, especially in regard to its color: A appeared orange, C rather grey-bluish. It could be observed together with Messier 57 and beta & gamma Lyrae. Very nice.