- Double Stars (Ori) -

And (43) Cet (1) Del (4) Lib (1) Per (27) UMi (1)
Aql (9) CMa (2) Dra (11) LMi (6) Psc (10) Vir (9)
Ari (8) Cnc (10) Equ (5) Lyn (18) Pup (1) Vul (3)
Aur (28) Com (8) Eri (1) Lyr (11) Ser (3)
Boo (20) CrB (4) Gem (22) Mon (1) Sex (2)
Cam (11) Crv (1) Her (16) Oph (1) Tau (11)
Cas (17) CVn (14) Hya (4) Ori (9) Tri (4)
Cep (13) Cyg (26) Leo (24) Peg (16) UMa (38)

STF 664 (**)
Name: STF664
Type: **
Constellation: Ori
Coordinates: 05h15m10.54s / +08°25'56.80"

Components:
m1 m2 ρ θ Year
7m8 8m4 4.8" 177° 2019
Robert Zebahl
70mm f/5.7, 100x, Bortle 6, SQM-L 19.2
At 44x barely split. At 100x easily split with obvious difference in brightness.

STF 668 (**)
Name: STF668, 19 Ori, beta Ori, Rigel
Type: **
Constellation: Ori
Coordinates: 05h14m32.27s / -08°12'05.90"

Components:
m1 m2 ρ θ Year
A-BC 0m3 6m8 9.7" 202° 2017
Robert Zebahl
55mm f/9.1, 83x
The second component was immediately seen as faint companion.

../sketches/2019-01-21_stf668.jpg

70mm f/5.7, 67x
First attempt at 133x: much fainter component clearly visible as a tiny star at a relatively large distance. After that the visibility was easy even at 67x. At 44x the faint component could only be guessed.
102mm f/11, 160x, Bortle 7, SQM-L 18.8, Seeing 3-4/5
Much fainter companion immediately visible as tiny star far outside the diffraction pattern of the primary component.

STF 688 (**)
Name: STF688
Type: **
Constellation: Ori
Coordinates: 05h19m20.88s / -10°44'49.90"

Components:
m1 m2 ρ θ Year
7m5 7m5 10.7" 95° 2015
Robert Zebahl
70mm f/5.7, 44x, Bortle 6, SQM-L 19.2
Clearly split with decent angular distance. Components appeared nearly equally bright.

STF 700 (**)
Name: STF700, V1804 Ori
Type: **
Constellation: Ori
Coordinates: 05h23m05.54s / +01°03'24.70"

Components:
m1 m2 ρ θ Year
7m7 7m9 4.8" 4° 2017
Robert Zebahl
70mm f/5.7, 44x, Bortle 6, SQM-L 19.2
At 44x split, but very close together. At 100x clearly split with nearly equally bright components.

STF 774 (**)
Name: STF774, zeta Ori, 50 Ori, Alnitak
Type: **
Constellation: Ori
Coordinates: 05h40m45.52s / -01°56'33.30"

Components:
m1 m2 ρ θ Year
AB 1m9 3m7 2.4" 167° 2017
AC 1m9 9m6 58.5" 10° 2017

../images/binary-star-orbits/STF774-AB-orbit.jpg

Robert Zebahl
70mm f/5.7, 128x, Bortle 6
AB: Big difference in brightness. I could see the fainter component near the first ring of the Airy pattern of the brighter component.

STF 848 (**)
Name: STF848
Type: **
Constellation: Ori
Coordinates: 06h08m30.36s / +13°58'15.80"

Components:
m1 m2 ρ θ Year
AB 7m3 8m2 2.6" 110° 2019
Robert Zebahl
70mm f/5.7, 100x, Bortle 6, SQM-L 19.2
Well split with obvious difference in brightness.

STF 877 (**)
Name: STF877
Type: **
Constellation: Ori
Coordinates: 06h14m42.67s / +14°35'10.80"

Components:
m1 m2 ρ θ Year
7m5 8m0 5.7" 263° 2019
Robert Zebahl
70mm f/5.7, 44x, Bortle 6, SQM-L 19.2
Well split, but close together. Little difference in brightness noticeable.

theta 1 Ori (**)
Name: theta 1 Ori, Trapezium, 41 Ori
Type: **
Constellation: Ori
Coordinates: 05h35m15.82s / -05°23'14.30"

Components:
m1 m2 ρ θ Year
AB 6m5 7m5 8.8" 32° 2018
AC 6m5 5m1 12.8" 132° 2018
BD 7m5 6m4 19.4" 121° 2018
CD 5m1 6m4 13.3" 62° 2018
AE 6m5 11m1 4.6" 352° 2013
CF 5m1 11m5 4.7" 120° 2013
Robert Zebahl
B 16x70
2021-02-24: Components A, C & D are clearly separable from each other. The fainter B component is almost completely outshone by A. The pair AB appears clearly elongated and is with concentrated observation in a few moments even visible separated.
70mm f/5.7, 22x
2021-02-24: The different bright components A-D are clearly visible separated from each other.

WNC 2 (**)
Name: WNC2
Type: **
Constellation: Ori
Coordinates: 05h23m51.32s / -00°51'59.80"

Components:
m1 m2 ρ θ Year
A-BC 6m9 7m0 3.3" 158° 2018

../images/binary-star-orbits/WNC2-A-BC-orbit.jpg

Robert Zebahl
70mm f/5.7, 44x, Bortle 6, SQM-L 19.2
Double star appeared elongated.
120mm f/5, 150x, Bortle 6, SQM-L 19.2
Clearly split with nearly equally bright components.