- Double Stars (Cnc) -

And (60) Cep (28) Cyg (98) Leo (35) Peg (43) SGE (1)
Aql (59) Cet (5) Del (16) Lep (7) Per (38) Sgr (11)
Aqr (4) CMa (6) Dra (27) Lib (4) Psc (18) Tau (19)
Ari (8) CMi (3) Equ (7) LMi (6) Pup (3) Tri (10)
Aur (32) Cnc (14) Eri (6) Lyn (18) Sco (5) UMa (47)
Boo (32) Com (13) Gem (33) Lyr (32) Sct (5) UMi (5)
Cam (17) CrB (10) Her (59) Mon (14) Ser (22) Vir (20)
Cap (7) Crv (4) Hya (11) Oph (18) Sex (6) Vul (12)
Cas (42) CVn (15) Lac (13) Ori (39) Sge (8)

S 570 (**)

Name: S570
Type: **
Constellation: Cnc
Coordinates: 08h39m06.10s / +19°40'36.50"

Components:
m1 m2 ρ θ Year
AB 7m.5 9m.6 57.3" 84° 2015
AC 7m.5 9m.3 178.6" 345° 2015
Located in Messier 44.

Robert Zebahl
B 16x70, Bortle 7, SQM-L 18.9
AB: 2022-03-02: Medium bright, widely separated with clear difference in brightness. I did not pay attention to the northern, more distant and brighter component C.

S 571 (**)

Name: S571
Type: **
Constellation: Cnc
Coordinates: 08h39m56.49s / +19°33'10.70"

Components:
m1 m2 ρ θ Year
AD 7m.3 6m.7 92.1" 242° 2018
AG 7m.3 7m.5 45.7" 158° 2018
Located in Messier 44. This multiple system also includes the double stars BU584 and CHR156. The brightest component is D.

Robert Zebahl
B 16x70, Bortle 7, SQM-L 18.9
AG: 2022-03-02: Wide pair. The northern component A is little brighter and appears slightly orange, the southern component G slightly bluish. I did not pay attention to the brightest component D to the west.

STF 1171 (**)

Name: STF1171
Type: **
Constellation: Cnc
Coordinates: 08h01m00.78s / +23°34'59.20"

Components:
m1 m2 ρ θ Year
6m.5 9m.9 2.1" 326° 2016
Robert Zebahl
102mm f/11, 187x
Observation from the city at half moon. At magnifications between 187x and 280x I could see the very dim companion almost permanently near the first diffraction ring. But the diffraction ring itself was hardly visible. Main problem here was probably the low brightness of the companion.

René Merting
100mm f/6.4, 213x
bei 142x schmiegt sich Komponente B an der Grenze zur Sichtbarkeit im Süden von Komponente A ganz dicht an den viel größeren Bruder, der ohne Beugungsringe auskommt - bei 213x zeigt sich B leicht abgesetzt von A

STF 1177 (**)

Name: STF1177, 17 Cnc
Type: **
Constellation: Cnc
Coordinates: 08h05m37.06s / +27°31'46.90"

Components:
m1 m2 ρ θ Year
6m.7 7m.4 3.5" 350° 2019
Robert Zebahl
70mm f/5.7, 57x, Bortle 6-
Easy to separate, but still relatively close together. Well visible difference in brightness. Color of the components was not clearly visible. Nice view overall.

René Merting
100mm f/6.4, 64x
bei 107x sehe ich ein knapp getrenntes schön eng stehendes Pärchen - Komponente B im Norden ist eine dreiviertel Größenklasse schwächer - das Weiß von A wirkt kühler - zurück auf 64x sehe ich eine Ameise mit dünnem Hals, in ruhigen Momenten zeigen sich beide Sterne sogar getrennt

STF 1187 (**)

Name: STF1187
Type: **
Constellation: Cnc
Coordinates: 08h09m30.45s / +32°13'18.80"

Components:
m1 m2 ρ θ Year
AB 7m.2 8m.0 3.1" 21° 2020

../images/binary-star-orbits/STF1187-AB-orbit.jpg

Robert Zebahl
70mm f/5.7, 57x, Bortle 6-
Split. Components very tight with noticeable difference in brightness.

STF 1245 (**)

Name: STF1245
Type: **
Constellation: Cnc
Coordinates: 08h35m51.05s / +06°37'13.90"

Components:
m1 m2 ρ θ Year
AB 6m.0 7m.2 10.1" 25° 2020
AC 6m.0 10m.7 99.8" 109° 2020
AD 6m.0 11m.9 109.1" 292° 2020
AE 6m.0 9m.6 113.2" 207° 2020
Robert Zebahl
70mm f/5.7, 57x, Bortle 6-
AB at 22x separated, but very close, uneven pair. A appeared white-yellowish, B orange, partly reddish. Opposite in a wide separation the fainter component E was visible. At 57x, A appeared white-yellowish, B orange.

../sketches/robert-zebahl/2020-03-24_stf1245.jpg

René Merting
100mm f/6.4, 32x
AB: bei 32x ein sehr enges Pärchen, gerade so getrennt - das Sternpaar ist heller, als viele andere Sterne in der unmittelbaren Umgebung, dadurch ist es sehr auffällig - Komponente A strahlt reinweiß, B steht dem in nichts nach, auch wenn die Komponente gut eine Magnitude schwächer ist

STF 1268 (**)

Name: STF1268, iota Cnc, 48 Cnc
Type: **
Constellation: Cnc
Coordinates: 08h46m41.82s / +28°45'35.60"

Components:
m1 m2 ρ θ Year
4m.1 6m.0 31.3" 307° 2020
Robert Zebahl
70mm f/5.7, 22x, Bortle 6, SQM-L 19.4
Striking, widely separated with noticeable difference in brightness. Moderate but beautiful color contrast: white-yellowish and grey-bluish.

102mm f/11, 28x
Grand sight! Pretty wide apart and unequal. A: mild orange, B: very nice light blue.

STF 1276 (**)

Name: STF1276
Type: **
Constellation: Cnc
Coordinates: 08h47m10.99s / +11°09'34.20"

Components:
m1 m2 ρ θ Year
AB 8m.3 8m.6 12.7" 353° 2017
Robert Zebahl
B 16x70, Bortle 7, SQM-L 18.9
2022-03-02: Pretty tight, medium bright double star with small difference in brightness.

STF 1291 (**)

Name: STF1291, 57 Cnc
Type: **
Constellation: Cnc
Coordinates: 08h54m14.65s / +30°34'45.80"

Components:
m1 m2 ρ θ Year
AB-C 5m.5 9m.2 54.6" 204° 2015
AB 6m.1 6m.4 1.5" 310° 2019

../images/binary-star-orbits/STF1291-AB-orbit.jpg

Robert Zebahl
70mm f/5.7, 133x, Bortle 6, SQM-L 19.4
AB: Immediately apparent as a double star. Diffraction disks overlapping slightly ('8'). Difference in brightness visible.

STF 1294 & SIN 41 (**)

Name: STF1294 & SIN41
Type: **
Constellation: Cnc
Coordinates: 08h57m17.08s / +32°53'57.90"

Components:
m1 m2 ρ θ Year
STF1294 AB 9m.0 10m.8 15.5" 340° 2017
SIN41 AC 9m.0 12m.6 191.3" 285° 2015
Robert Zebahl
102mm f/11, 28x, Bortle 6-, SQM-L 19.0
STF1294 (AB): At 28x relatively widely separated and rather less striking near the bright star sigma 2 Cnc. Component A appeared slightly orange, the companion only as a dim star. Similar view at 86x.

STF 1298 (**)

Name: STF1298, 66 Cnc
Type: **
Constellation: Cnc
Coordinates: 09h01m24.13s / +32°15'08.30"

Components:
m1 m2 ρ θ Year
AB 6m.0 8m.6 4.4" 137° 2017
AC 6m.0 12m.0 186.8" 319° 2017
Robert Zebahl
70mm f/5.7, 80x, Bortle 6, SQM-L 19.4
AB: At 67x and 80x the companion is visible as a very faint star close to the main component. At 133x it is only visible as a slightly blurred tiny star just outside the first diffraction ring of the primary component.

102mm f/11, 62x, Bortle 6-, SQM-L 19.0
AB: At 62x clearly separated, significant difference in brightness. The companion can be seen well as a faint little star, apart from the primary component. At 125x easy to split. Component A appeared rather white.

STT 195 (**)

Name: STT195
Type: **
Constellation: Cnc
Coordinates: 08h53m57.80s / +08°25'17.70"

Components:
m1 m2 ρ θ Year
AB 7m.7 8m.3 9.8" 138° 2020
Robert Zebahl
70mm f/5.7, 80x, Bortle 6-
At 22x very nicely separated with a small difference in brightness. The components are still pretty tight. Altogether a rather dim double star. At 80x the color difference is well visible: primary component appears slightly orange, the companion pale blue.

STTA 94 (**)

Name: STTA94
Type: **
Constellation: Cnc
Coordinates: 08h36m10.95s / +13°46'39.20"

Components:
m1 m2 ρ θ Year
7m.4 8m.1 43.2" 133° 2018
Robert Zebahl
B 16x70, Bortle 7, SQM-L 18.9
2022-03-02: Isolated double star with moderate separation and difference in brightness. The primary component appears white-yellowish, the color of the companion is not clearly visible.

zeta Cnc (**)

Name: zeta Cnc, 16 Cnc
Type: **
Constellation: Cnc
Coordinates: 08h12m12.79s / +17°38'51.20"

Components:
m1 m2 ρ θ Year
STF1196 AB-C 4m.9 5m.8 6.0" 64° 2020
STF1196 AB 5m.3 6m.2 1.2" 2020
STF1196 AC 5m.3 5m.8 6.2" 62° 2020
HUT1 Ca-Cb 6m.2 7m.1 0.3" 2020

../images/binary-star-orbits/STF1196-AB-C-orbit.jpg ../images/binary-star-orbits/STF1196-AB-orbit.jpg ../images/binary-star-orbits/HUT1-Ca-Cb-orbit.jpg

Robert Zebahl
70mm f/5.7, 133x, Bortle 6-
The wide pair AB-C is already separable at 22x. The pair AB shows at 133x two clearly overlapping diffraction disks with small difference in brightness, but without any notch.

../sketches/robert-zebahl/2020-03-24_stf1196.jpg

102mm f/11, 86x, Bortle 6-, SQM-L 19.2
AB-C: Easy to separate. A: light grey, B: pale orange.

120mm f/5, 67x, Bortle 6, SQM-L 19.3
AB-C: Evident difference in brightness, easy to split. Both components of similar color.

120mm f/5, 200x, Bortle 6, SQM-L 19.3
AB: Very tight. The Airy disks were still touching. Slight difference in brightness. Extremely beautiful triple star!

../sketches/robert-zebahl/2019-02-24_stf1196.jpg