- Double Stars (Dra) -

And (32) Cep (13) CVn (11) Her (15) Mon (1) Sex (2)
Aql (9) Cet (1) Cyg (25) Hya (4) Oph (1) Tau (11)
Ari (8) CMa (1) Del (4) Leo (21) Ori (8) Tri (4)
Aur (27) Cnc (10) Dra (11) Lib (1) Peg (16) UMa (36)
Boo (19) 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 (11) Ser (3) Vul (3)

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" 2° 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 1362 (**)
Name: STF1362
Type: **
Constellation: Dra
Coordinates: 09h37m56.18s / +73°04'49.50"

Components:
m1 m2 ρ θ Year
7m0 7m2 4.9" 125° 2017

../images/binary-star-orbits/STF1362-orbit-solution-1.jpg ../images/binary-star-orbits/STF1362-orbit-solution-2.jpg ../images/binary-star-orbits/STF1362-orbit-solution-3.jpg ../images/binary-star-orbits/STF1362-orbit-solution-4.jpg

Robert Zebahl
70mm f/5.7, 31x, Bortle 6, SQM-L 19.3
2020-04-21: At 22x extremely tight, but separable. At 31x very fine separation. Both components appeared white. Very nice sight! At 57x well separated, similarly bright. One component appeared white-yellowish with a hint of orange, the other more white.

STF 1626 (**)
Name: STF1626
Type: **
Constellation: Dra
Coordinates: 12h16m47.11s / +70°08'45.70"

Components:
m1 m2 ρ θ Year
9m4 9m6 2.1" 2° 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 2273 (**)
Name: STF2273
Type: **
Constellation: Dra
Coordinates: 17h59m13.71s / +64°08'33.10"

Components:
m1 m2 ρ θ Year
AB 7m3 7m6 22.0" 283° 2017
AC 7m3 12m7 43.5" 277° 2015
AD 7m3 14m7 14.8" 336° 2015
BC 7m6 12m7 22.4" 271° 2015
Robert Zebahl
70mm f/5.7, 22x, Bortle 6, SQM-L 19.3
AB: 2020-04-21: A nice separation, striking with moderate distance. The components appear similarly bright and are both yellowish orange.

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
B 8x44, Bortle 6, SQM-L 19.3
2020-06-27: The pair AB split, but very tight with components of equal brightness. In acute angle far apart the component C was also visible.
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 Dra, 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

TOK 668 (**)
Name: TOK668
Type: **
Constellation: Dra
Coordinates: 09h57m52.09s / +76°36'46.70"

Components:
m1 m2 ρ θ Year
6m1 7m4 5.3" 259° 2015
Robert Zebahl
70mm f/5.7, 57x, Bortle 6, SQM-L 19.3
2020-04-21: At this position no comparably bright star was visible.