- Double Stars (Cnc) -

And (31) Cep (13) CVn (3) Her (12) Ori (8) Tri (5)
Aql (9) Cet (1) Cyg (19) Leo (11) Peg (16) UMa (11)
Ari (8) CMa (1) Del (2) LMi (4) Per (18) UMi (1)
Aur (27) Cnc (7) Dra (8) Lyn (14) Psc (7) Vir (6)
Boo (8) Com (1) Equ (5) Lyr (8) Ser (3)
Cam (5) CrB (4) Eri (1) Mon (1) Sex (1)
Cas (17) Crv (1) Gem (19) Oph (1) Tau (11)

STF1171 (**)

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

Components:
m1 m2 ρ θ Year
6m5 9m9 2.0" 326° 2015
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.

STF1177 (**)

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

Components:
m1 m2 ρ θ Year
6m7 7m4 3.5" 349° 2017
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.

STF1187 (**)

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

Components:
m1 m2 ρ θ Year
AB 7m2 8m0 3.1" 19° 2017
70mm f/5.7, 57x, Bortle 6-
Split. Components very tight with noticeable difference in brightness.

STF1196 (**)

Name: STF1196, zeta Cnc, 16 Cnc
Type: **
Constellation: Cnc
Coordinates: 08h12m12.79s / +17°38'51.20"

Components:
m1 m2 ρ θ Year
AB-C 4m9 5m8 5.8" 66° 2017
AB 5m3 6m2 1.0" 2017
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/2019-02-24_stf1196.jpg

STF1268 (**)

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

Components:
m1 m2 ρ θ Year
4m1 6m0 31.3" 308° 2016
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-blueish.

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

STF1291 (**)

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

Components:
m1 m2 ρ θ Year
AB 6m1 6m4 1.5" 310° 2017
AB-C 5m5 9m2 54.6" 204° 2015
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.

STF1298 (**)

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

Components:
m1 m2 ρ θ Year
AB 6m0 8m6 4.4" 137° 2017
AC 6m0 12m0 187.6" 318° 2015
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.