- Double Stars (Boo) -

And (32) Cep (13) CVn (4) Her (13) Mon (1) Sex (1)
Aql (9) Cet (1) Cyg (19) Hya (1) Oph (1) Tau (11)
Ari (8) CMa (1) Del (2) Leo (14) Ori (8) Tri (4)
Aur (27) Cnc (10) Dra (8) Lib (1) Peg (16) UMa (11)
Boo (8) Com (1) Equ (5) LMi (4) Per (18) UMi (1)
Cam (5) CrB (4) Eri (1) Lyn (16) Psc (7) Vir (6)
Cas (17) Crv (1) Gem (19) Lyr (8) Ser (2)

mu Boo (**)

Name: mu Boo, 51 Boo, Alkalurops
Type: **
Constellation: Boo
Coordinates: 15h24m29.54s / +37°22'37.10"

Components:
m1 m2 ρ θ Year
CHR181, mu 1 Boo Aa-Ab 4m3 None 0.1" 188° 2012
STFA28, mu 1 Boo AB 4m3 7m1 109.0" 172° 2018
STF1938, mu 2 Boo Ba-Bb 7m1 7m6 2.3" 2019

../images/binary-star-orbits/CHR181-Aa-Ab-orbit.jpg ../images/binary-star-orbits/STF1938-Ba-Bb-orbit.jpg

Robert Zebahl
B 8x40, Bortle 7, NELM 5m0, SQM-L 19.2
STFA28 (AB): Easily split with obvious difference in brightness.

70mm f/5.7, 22x, Bortle 6, SQM-L 19.2
STFA28 (AB): Evident, very wide apart and unequal. A: white-yellowish, B: grey.

102mm f/11, 125x, Bortle 6-, SQM-L 19.2
STF1938 (Ba-Bb): Beautiful view! This triple system includes STFA 28 and STF 1938.

../sketches/2019-04-04_mu_boo.jpg

120mm f/5, 23x, Bortle 6, NELM 5m0+, SQM-L 19.4
STFA28 (AB): Easy to split with large angular distance and noticeable difference in brightness.

STF 1834 (**)

Name: STF1834
Type: **
Constellation: Boo
Coordinates: 14h20m17.60s / +48°30'25.10"

Components:
m1 m2 ρ θ Year
8m1 8m3 1.6" 104° 2018

../images/binary-star-orbits/STF1834-orbit.jpg

Robert Zebahl
120mm f/5, 150x, Bortle 6, NELM 5m0+, SQM-L 19.4
At 108x elongated, at 150x barely split with similarly bright components.

STF 1835 & BU1111 (**)

Name: STF1835 & BU1111, WDS14234+0827
Type: **
Constellation: Boo
Coordinates: 14h23m22.74s / +08°26'47.90"

Components:
m1 m2 ρ θ Year
STF1835 A-BC 5m0 6m8 6.2" 196° 2018
BU1111 BC 7m4 7m7 0.3" 16° 2018

../images/binary-star-orbits/BU1111-BC-orbit.jpg

Robert Zebahl
102mm f/11, 62x
STF1835 (A-BC): At 28x barely split with visible difference in brightness. At 62x easy to separate. The colors seemed similar.

STF 1877 (**)

Name: STF1877, epsilon Boo, Izar
Type: **
Constellation: Boo
Coordinates: 14h44m59.14s / +27°04'29.90"

Components:
m1 m2 ρ θ Year
AB 2m6 4m8 2.8" 347° 2018
Robert Zebahl
55mm f/9.1, 125x
The fainter component was seen as permanent brightening on the first diffraction ring of the primary component.

60mm f/10, 192x, Bortle 6-, SQM-L 19.1
Easy to split, whereby the much fainter component lies on the first diffraction ring of the primary component. The primary component itself appeared slightly yellowish.

../sketches/2018-04-10_epsilon_boo.jpg

70mm f/5.7, 133x, Bortle 6, SQM-L 19.2
Easy to split, very unequal. A appeared in pale orange, B was visible as a very tiny, grey star on the first diffraction ring of component A.

120mm f/5, 192x, Bortle 4, SQM-L 21.3
At 85x the fainter component was easily visible but not separated. At 192x well split. The fainter component was almost on the first diffraction ring of the primary component. Quite big difference in brightness. I did not looked at the color of the components.

STF 1884 (**)

Name: STF1884
Type: **
Constellation: Boo
Coordinates: 14h48m23.37s / +24°22'01.00"

Components:
m1 m2 ρ θ Year
6m6 7m5 2.1" 58° 2019

../images/binary-star-orbits/STF1884-orbit.jpg

Robert Zebahl
102mm f/11, 86x
At 86x pretty tight and unequal. At 160x clearly split. A: white, B: slightly orange.

STF 1886 (**)

Name: STF1886
Type: **
Constellation: Boo
Coordinates: 14h51m02.31s / +09°43'25.20"

Components:
m1 m2 ρ θ Year
AB 7m6 9m7 7.9" 224° 2018
Robert Zebahl
102mm f/11, 28x
At 28x, the B component appeared rather faint and pretty close to the primary component. At 62x both components were clearly visible and unequal. A: slightly orange, B: greyish.

STF 1890 (**)

Name: STF1890, 39 Boo
Type: **
Constellation: Boo
Coordinates: 14h49m41.37s / +48°43'15.60"

Components:
m1 m2 ρ θ Year
6m3 6m7 2.5" 46° 2019

../images/binary-star-orbits/STF1890-orbit.jpg

Robert Zebahl
70mm f/5.7, 67x, Bortle 6, SQM-L 19.2
At 44x elongated, partly notched. At 67x split, but very tight. A difference in brightness was not seen. At 133x clearly separated with little difference in brightness. A appeared pale yellow, B rather warm-white.

STT 298 (**)

Name: STT298
Type: **
Constellation: Boo
Coordinates: 15h36m02.22s / +39°48'08.90"

Components:
m1 m2 ρ θ Year
AB 7m2 8m4 1.3" 187° 2017
AB-C 6m9 7m8 120.4" 328° 2017
AB-D 6m9 13m9 167.4" 224° 2002
AB-E 6m9 12m1 456.0" 335° 2002

../images/binary-star-orbits/STT298-AB-orbit.jpg

Robert Zebahl
102mm f/11, 28x
AB-C: Wide, moderately unequal pair. Little difference in color: Primary components appeared a bit more orange colored.
120mm f/5, 23x, Bortle 6, NELM 5m0+, SQM-L 19.4
AB-C: Easy to split with large angular distance and noticeable difference in brightness.