Theta Boötis
Star in the northern constellation of Boötes / From Wikipedia, the free encyclopedia
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Theta Boötis, Latinized from θ Boötis, is a star in the northern constellation of Boötes the herdsman, forming a corner of the upraised left hand of this asterism.[13] It has the traditional name Asellus Primus (/əˈsɛləs ˈpraɪməs/; Latin for "first donkey colt")[13] and the Flamsteed designation 23 Boötis. Faintly visible to the naked eye, this star has a yellow-white hue with an apparent visual magnitude of 4.05.[2] It is located at a distance of 47 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −10.6 km/s.[5]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 25m 11.79703s[1] |
Declination | +51° 51′ 02.6769″[1] |
Apparent magnitude (V) | 4.05[2] + 13.23[3] |
Characteristics | |
Spectral type | F7 V[2] + M2.5V[3] |
U−B color index | −0.02[4] |
B−V color index | +0.50[2] |
Astrometry | |
Radial velocity (Rv) | −10.627±0.0065[5] km/s |
Proper motion (μ) | RA: −235.40[1] mas/yr Dec.: −399.07[1] mas/yr |
Parallax (π) | 68.82 ± 0.14 mas[1] |
Distance | 47.39 ± 0.10 ly (14.53 ± 0.03 pc) |
Absolute magnitude (MV) | 3.25[6] |
Details | |
A | |
Mass | 1.41 M☉[7] 1.24[8] M☉ |
Radius | 1.733±0.011[9] R☉ |
Luminosity | 4.131±0.096[9] L☉ |
Surface gravity (log g) | 4.07[8] cgs |
Temperature | 6,294±40[8] K |
Metallicity [Fe/H] | 0.03[8] dex |
Rotational velocity (v sin i) | 29.2[10] km/s |
Age | 3.1 Gyr[11] 3.83[8] Gyr |
B | |
Mass | 0.21[7] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | data |
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