- Double Stars (Lyr) -

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

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
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

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.

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
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

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.

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

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 colour of both components appeared slightly yellowish-orange.

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