Theta Bootis
Star θ bootis |
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Position of θ bootis | |||||||||||||||||
AladinLite | |||||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Bear keeper | ||||||||||||||||
Right ascension | 14 h 25 m 11.8 s | ||||||||||||||||
declination | + 51 ° 51 ′ 2.7 ″ | ||||||||||||||||
Apparent brightness | 4.04 mag | ||||||||||||||||
Typing | |||||||||||||||||
B − V color index | +0.50 | ||||||||||||||||
U − B color index | +0.01 | ||||||||||||||||
R − I index | +0.25 | ||||||||||||||||
Spectral class | F7 V | ||||||||||||||||
Astrometry | |||||||||||||||||
Radial velocity | (−11.6 ± 0.3) km / s | ||||||||||||||||
parallax | (68.82 ± 0.14) mas | ||||||||||||||||
distance | (47.393 ± 0.096) Lj (14.531 ± 0.030) pc |
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Visual absolute brightness M vis | +3.23 mag | ||||||||||||||||
Proper movement | |||||||||||||||||
Rec. Share: | (−235.40 ± 0.14) mas / a | ||||||||||||||||
Dec. portion: | (−399.07 ± 0.13) mas / a | ||||||||||||||||
Physical Properties | |||||||||||||||||
Other names and catalog entries |
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θ Bootis ( Theta Bootis , pronunciation: "Bo-otes") is a main sequence star in the Bear Guardian constellation . He bears the proper name Asellus Primus (Latin for first donkey ). Theta Bootis has an apparent magnitude of 4.1 mag and belongs to the spectral class F7. Its distance is about 47 light years .
Theta Bootis is located - with the close neighboring stars ι and κ Bootis ( Asellus Secundus and Tertius ) on the northern edge of the constellation, near the drawbar of the Big Dipper .
See also: Asellus Borealis and Asellus Australis in Cancer
Individual evidence
- ↑ a b c Hipparcos catalog (ESA 1997)
- ↑ a b c Bright Star Catalog
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ estimated based on the apparent brightness and distance