Theta Bootis

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Star
θ bootis
Position of θ bootis
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
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  
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
Bayer name θ bootis
Flamsteed name 23 bootis
Bonn survey BD + 52 ° 1804
Bright Star Catalog HR 5404 [1]
Henry Draper Catalog HD 126660 [2]
Hipparcos catalog HIP 70497 [3]
SAO catalog SAO 29137 [4]
Tycho catalog TYC 3478-1332-1 [5]

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

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b c Bright Star Catalog
  3. ↑ Pulkovo radial velocities for 35493 HIP stars
  4. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  5. ↑ estimated based on the apparent brightness and distance