- Double Stars (CVn) -

And (60) Cep (28) Cyg (98) Leo (35) Peg (43) SGE (1)
Aql (58) Cet (5) Del (16) Lep (7) Per (37) 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)

25 CVn (**)

Name: 25 CVn
Type: **
Constellation: CVn
Coordinates: 13h37m27.70s / +36°17'41.40"

Components:
m1 m2 ρ θ Year
STF1768 AB 5m.0 7m.0 1.6" 95° 2020
STF1768 AC 5m.0 11m.6 214.3" 321° 2015
KZA73 AD 5m.0 13m.0 335.6" 92° 2015
KZA73 AE 5m.0 12m.7 371.6" 139° 2020
KZA73 AF 5m.0 9m.4 437.3" 118° 2015

../images/binary-star-orbits/STF1768-AB-orbit.jpg

Robert Zebahl
60mm f/18.7, 160x
AB: 2020-03-16: 102/1122mm ED refractor stopped down to 60mm. The diffraction ring of the primary component is virtually invisible. The companion appears only in few moments as an extremely faint, elongated brightening in the diffraction ring. Very difficult. Telescope should be in very good optical condition!

70mm f/16, 160x
AB: 2020-03-16: 102/1122mm ED refractor stopped down to 70mm. Companion only visible as a subtle, elongated, not permanently visible brightening. The diffraction ring of the primary component is only visible occasionally. Difficult. Telescope should be in good optical condition!

80mm f/14, 160x
AB: 2020-03-16: 102/1122mm ED refractor stopped down to 80mm. Companion permanently visible as elongated brightening in the diffraction ring. But the diffraction ring itself appears rather faint. Moderately difficult.

90mm f/12.5, 160x
AB: 2020-03-16: 102/1122mm ED refractor stopped down to 90mm. Companion quite clearly recognizable as elongated brightening in diffraction ring. Relatively simple.

102mm f/11, 160x
AB: 2020-03-16: The faint companion is immediately recognizable as a distinct, slightly elongated brightening in the diffraction ring. Easy.

152mm f/5.9, 150x, Bortle 6-, SQM-L 19.1
AB: 2020-03-19: At 150x the clearly fainter companion is visible as a roundish brightening. Due to the chromatic aberration of the achromat (152mm f/5.9) the companion is almost outshined. At 180x the companion is then well, at 225x and 300x very well visible as a tiny separated star.

S 654 & SHY 633 (**)

Name: S654 & SHY633, WDS13470+3833
Type: **
Constellation: CVn
Coordinates: 13h46m59.77s / +38°32'33.70"

Components:
m1 m2 ρ θ Year
S654 AB 5m.6 8m.9 71.3" 239° 2018
SHY633 AC 5m.6 8m.9 999.9" 296° 2020
René Merting
100mm f/6.4, 32x
S654 (AB): bei 32x ein weit getrenntes Pärchen - B im Südwesten ist deutlich schwächer und farblos ggü. der weiß strahlenden Komponente A

STF 1606 (**)

Name: STF1606
Type: **
Constellation: CVn
Coordinates: 12h10m47.34s / +39°53'29.50"

Components:
m1 m2 ρ θ Year
7m.4 7m.9 0.7" 143° 2019

../images/binary-star-orbits/STF1606-orbit-solution-1.jpg ../images/binary-star-orbits/STF1606-orbit-solution-2.jpg

Robert Zebahl
120mm f/5, 200x, Bortle 6-, SQM-L 19.0
2021-04-04: The double star appeared slightly elongated.

STF 1622 (**)

Name: STF1622, 2 CVn
Type: **
Constellation: CVn
Coordinates: 12h16m07.55s / +40°39'36.60"

Components:
m1 m2 ρ θ Year
5m.9 8m.7 11.6" 260° 2017
Robert Zebahl
120mm f/5, 86x, Bortle 6-, SQM-L 19.0
2021-04-04: Beautiful double star with components of very different brightness. Primary component is shining in bright, brilliant orange, the well separated companion appears grey-bluish.

STF 1632 (**)

Name: STF1632
Type: **
Constellation: CVn
Coordinates: 12h20m13.50s / +37°54'07.70"

Components:
m1 m2 ρ θ Year
6m.8 10m.0 10.1" 192° 2017
Robert Zebahl
120mm f/5, 86x, Bortle 6-, SQM-L 19.0
2021-04-04: Relatively wide pair with large difference in brightness. Primary component appeared white-yellowish with faint companion.

STF 1692 (**)

Name: STF1692, 12 CVn, alpha CVn, Cor Caroli
Type: **
Constellation: CVn
Coordinates: 12h56m01.67s / +38°19'06.20"

Components:
m1 m2 ρ θ Year
AB 2m.9 5m.5 19.3" 230° 2020
Robert Zebahl
70mm f/5.7, 22x
Beautiful view. Clearly unequal with nice angular distance. Primary component appeared in pale yellow, companion silvery-white.

4.5" f/8, 28x, Bortle 6, NELM 5m.3, SQM-L 19.7
Well split with big difference in brightness.

René Merting
100mm f/6.4, 32x
bei 64x ein auffälliger Doppelstern - A ist gleißend weiß, B im Südwesten ist 1.5 Größenklassen schwächer (2.67 mag lt. Stelle Doppie, schon zum zweiten Mal vertan hier)

12.5" f/4.5, 72x
bei 72x ein schönes Pärchen - A ist weiß - B zeigt sich gut getrennt südwestlich von A, ist gut 1.5 Größenklassen schwächer (2.67 mag laut Stelle Doppie) und mit einem leichten Stich ins gelbliche (warmweiß) - zurück auf 20x eine ungleiche 8, bei 32x knapp getrennt

STF 1747 (**)

Name: STF1747
Type: **
Constellation: CVn
Coordinates: 13h27m45.73s / +47°45'32.20"

Components:
m1 m2 ρ θ Year
9m.3 10m.2 14.9" 345° 2021
Robert Zebahl
70mm f/5.7, 44x, Bortle 6, SQM-L 19.4
2020-04-20: Easy to separate. The primary component appeared slightly orange with a noticeably fainter companion.

STF 1755 (**)

Name: STF1755
Type: **
Constellation: CVn
Coordinates: 13h32m21.99s / +36°49'05.60"

Components:
m1 m2 ρ θ Year
7m.3 8m.1 4.1" 133° 2018
Robert Zebahl
70mm f/5.7, 67x, Bortle 6-, NELM 5m.0, SQM-L 19.1
At 31x just separable, extremely tight. At 44x clearly separated, but still close, relatively dim pair with moderate difference in brightness. At 67x and 100x well separable. The primary component appeared slightly orange.

René Merting
100mm f/6.4, 64x
bei 64x ein extrem eng stehendes Paar - B im SO ist maximal eine halbe Größenklasse schwächer als A - beide spielen Braut in ihren reinweißen Kleidern

STF 1758 (**)

Name: STF1758
Type: **
Constellation: CVn
Coordinates: 13h32m51.51s / +49°08'24.30"

Components:
m1 m2 ρ θ Year
8m.7 8m.9 3.4" 290° 2019
Robert Zebahl
70mm f/5.7, 67x, Bortle 6, SQM-L 19.4
2020-04-20: Clearly split, still relatively tight pair with little difference in brightness. The components appear slightly different in color: slightly orange, yellowish.

STF 1769 (**)

Name: STF1769
Type: **
Constellation: CVn
Coordinates: 13h38m01.95s / +39°10'41.00"

Components:
m1 m2 ρ θ Year
AB 7m.9 10m.4 1.6" 45° 2015
AC 7m.9 9m.3 56.2" 259° 2015
AD 7m.9 13m.0 149.4" 187° 2015
CD 9m.3 13m.0 141.8" 165° 2015

../images/binary-star-orbits/STF1769-AB-orbit.jpg

René Merting
100mm f/6.4, 32x
AC: bei 32x ein weit auseinander stehendes Pärchen - B im Westen ist eine Größenklasse schwächer als die weiße Komponente A und wirkt gegen A richtiggehend blaugrau

STF 1786 (**)

Name: STF1786
Type: **
Constellation: CVn
Coordinates: 13h49m38.98s / +34°59'18.10"

Components:
m1 m2 ρ θ Year
AB 8m.9 10m.3 10.9" 21° 2017
Robert Zebahl
70mm f/5.7, 44x, Bortle 6, SQM-L 19.4
2020-04-20: Nicely separated at an attractive distance and with a clear difference in brightness. The components appeared pale orange and greyish.

STF 1789 (**)

Name: STF1789
Type: **
Constellation: CVn
Coordinates: 13h54m05.19s / +32°49'35.20"

Components:
m1 m2 ρ θ Year
8m.6 9m.0 6.7" 328° 2021

../images/binary-star-orbits/STF1789-orbit-solution-1.jpg ../images/binary-star-orbits/STF1789-orbit-solution-2.jpg

Robert Zebahl
70mm f/5.7, 31x, Bortle 6, SQM-L 19.4
2020-04-20: At 22x clearly visible as figure '8' and almost separated. At 31x fine separation of the still close pair. A slight difference in brightness and color is visible: white-yellowish, yellowish-orange.

STFA 24 (**)

Name: STFA24
Type: **
Constellation: CVn
Coordinates: 13h10m03.27s / +38°29'55.90"

Components:
m1 m2 ρ θ Year
AB 6m.0 6m.3 275.6" 296° 2012
This double star contains of the components 15 and 17 CVn.

Robert Zebahl
B 8x40, Bortle 7, NELM 5m.0, SQM-L 19.2
Both components similar in brightness with large distance.

René Merting
12.5" f/4.5, 45x
extrem weit getrennt, ein auffälliges Trio zusammen mit 16 CVn nördlich - eher etwas für Kleinst-Ferngläser

STT 261 (**)

Name: STT261
Type: **
Constellation: CVn
Coordinates: 13h12m02.02s / +32°05'07.90"

Components:
m1 m2 ρ θ Year
7m.4 7m.6 2.5" 337° 2020

../images/binary-star-orbits/STT261-orbit.jpg

Robert Zebahl
70mm f/5.7, 57x, Bortle 6, SQM-L 19.4
2020-04-20: At 44x immediately visible as figure '8', even separable on closer look. The components appeared similarly bright. Overall rather dim. At 57x clearly split, but still very close together with a small difference in brightness.

STT 274 (**)

Name: STT274
Type: **
Constellation: CVn
Coordinates: 14h06m41.61s / +34°46'42.80"

Components:
m1 m2 ρ θ Year
7m.1 10m.5 12.7" 51° 2019
Robert Zebahl
70mm f/5.7, 133x, Bortle 6, SQM-L 19.4
2020-04-20: At 100x and 133x no signs of the faint companion visible.