- Double Stars (Dra) -

And (32) Cep (13) CVn (4) Her (13) Oph (1) Tau (11)
Aql (9) Cet (1) Cyg (19) Hya (1) Ori (8) Tri (4)
Ari (8) CMa (1) Del (2) Leo (14) Peg (16) UMa (11)
Aur (27) Cnc (10) Dra (8) LMi (4) Per (18) UMi (1)
Boo (8) Com (1) Equ (5) Lyn (16) Psc (7) Vir (6)
Cam (5) CrB (4) Eri (1) Lyr (8) Ser (2)
Cas (17) Crv (1) Gem (19) Mon (1) Sex (1)

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 5m4 5m5 90.0" 193° 2017
STF2078, 17 Dra AB 5m4 6m4 3.3" 104° 2018
Robert Zebahl
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

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 5m7 5m7 2.5" 2018
BU1088 AC 5m7 13m7 12.2" 174° 2015

../images/binary-star-orbits/STF2130-AB-orbit.jpg

Robert Zebahl
102mm f/11, 125x, Bortle 6
AB: Easy to separate. Beautiful sight. Components equally bright with no discernible color difference.

STF 1626 (**)

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

Components:
m1 m2 ρ θ Year
9m4 9m6 2.1" 2017
Robert Zebahl
120mm f/5, 150x, Bortle 6, NELM 5m0+, SQM-L 19.3
Components similar in brightness, pretty faint, close together, but clearly split.

STF 2054 (**)

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

Components:
m1 m2 ρ θ Year
AB 6m2 7m1 1.0" 350° 2018
Robert Zebahl
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

STF 2308 (**)

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

Components:
m1 m2 ρ θ Year
40/41 Dra AB 5m7 6m0 18.7" 232° 2018
AC 5m7 8m3 224.7" 129° 2015

../images/binary-star-orbits/STF2308-AB-orbit.jpg

Robert Zebahl
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

STF 2323 (**)

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

Components:
m1 m2 ρ θ Year
AC 5m1 8m0 89.1" 19° 2017
AB 5m1 8m1 3.8" 348° 2018

../images/binary-star-orbits/STF2323-AB-orbit.jpg

Robert Zebahl
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

STFA 35 (**)

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
4m9 4m9 62.1" 311° 2017
Robert Zebahl
102mm f/11, 28x
Wide, bright, equal pair. Both components looked cream-white. Due to the distance a double for binoculars.

STT 312 (**)

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

Components:
m1 m2 ρ θ Year
AB 2m8 8m2 4.4" 143° 2015
Robert Zebahl
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