Gamma Boötis
Binary star system in the constellation Boötes / From Wikipedia, the free encyclopedia
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Gamma Boötis, Latinised from γ Boötis, is a binary star[12] system in the northern constellation of Boötes the herdsman, forming the left shoulder of this asterism.[13] The primary component has the proper name Seginus /sɪˈdʒaɪnəs/, the traditional name of the Gamma Bootis system.[14] It has a white hue and is visible to the naked eye with a typical apparent visual magnitude of +3.03.[2] Based on parallax measurements obtained during the Hipparcos mission, it is located at a distance of approximately 85 light-years from the Sun, but is drifting closer with a radial velocity of −32 km/s.[6]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 32m 04.67180s[1] |
Declination | +38° 18′ 29.7043″[1] |
Apparent magnitude (V) | +3.03[2] +3.02 to +3.07[3] |
Characteristics | |
Spectral type | A7 IV+(n)[2] or A7 III[4] |
U−B color index | +0.120[4] |
B−V color index | +0.191[4] |
Variable type | δ Sct[5] |
Astrometry | |
Radial velocity (Rv) | −32.40±1.0[6] km/s |
Proper motion (μ) | RA: −115.71[1] mas/yr Dec.: +151.16[1] mas/yr |
Parallax (π) | 37.58 ± 0.14 mas[1] |
Distance | 86.8 ± 0.3 ly (26.61 ± 0.10 pc) |
Absolute magnitude (MV) | +0.93[4] |
Details | |
Aa | |
Mass | 2.10[7] M☉ |
Radius | 5.16+0.71 −0.96[8] R☉ |
Luminosity | 33.4[9] L☉ |
Surface gravity (log g) | 3.75±0.05[4] cgs |
Temperature | 7,800[10] K |
Metallicity [Fe/H] | −0.08[4] dex |
Rotational velocity (v sin i) | 121[10] km/s |
Age | 0.9[4] or 1.0[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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