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Star in the constellation Boötes From Wikipedia, the free encyclopedia
31 Boötis is a single[8] star in the northern constellation of Boötes,[7] located 470 light years from the Sun.[1] It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.86.[2] The object is moving closer to the Earth with a heliocentric radial velocity of −16.5 km/s.[2] It was known to be part of a constellation between Virgo and Boötes named Mons Maenalus, it was also the brightest star in the constellation.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 41m 38.75049s[1] |
Declination | +08° 09′ 42.3409″[1] |
Apparent magnitude (V) | 4.86[2] |
Characteristics | |
Spectral type | G7 IIIa[3] |
B−V color index | 0.992±0.038[2] |
Astrometry | |
Radial velocity (Rv) | −16.5±1.8[2] km/s |
Proper motion (μ) | RA: –9.589[1] mas/yr Dec.: +3.906[1] mas/yr |
Parallax (π) | 6.8757 ± 0.2796 mas[1] |
Distance | 470 ± 20 ly (145 ± 6 pc) |
Absolute magnitude (MV) | −1.22[2] |
Details | |
Mass | 3.27[4] M☉ |
Radius | 23.25+0.40 −0.49[1] R☉ |
Luminosity | 274.9±12.6[1] L☉ |
Surface gravity (log g) | 2.60[5] cgs |
Temperature | 4,874+53 −41[1] K |
Metallicity [Fe/H] | −0.10[5] dex |
Rotational velocity (v sin i) | 6.5[6] km/s |
Age | 370[4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved giant star with a stellar classification of G7 IIIa.[3] It is a suspected variable star of unknown type,[9] and is an X-ray source.[10] The star is 370[4] million years old with 3.27[4] times the mass of the Sun. Having exhausted the hydrogen at its core, the star has expanded to 23[1] times the Sun's radius. It is radiating 275[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,874 K.[1]
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