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Beta Boötis
Star in the constellation Boötes / From Wikipedia, the free encyclopedia
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Beta Boötis, Latinized from β Boötis, and also named Nekkar /ˈnɛkɑːr/,[8] is a star in the northern constellation of Boötes. It has an apparent visual magnitude of 3.5,[2] making it one of the brighter members of the constellation. In the modern constellation, it marks the head of Boötis the herdsman.[9] Based upon parallax measurements obtained by the Gaia spacecraft, this star is approximately 235 light-years (72 parsecs) from the Sun.[1] The magnitude of the star is reduced by 0.06 from extinction caused by intervening gas and dust.[6]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
A star chart showing the position of β Boötis (circled) | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 15h 01m 56.7623s[1] |
Declination | +40° 23′ 26.0469″[1] |
Apparent magnitude (V) | 3.488[2] |
Characteristics | |
Evolutionary stage | Yellow giant |
Spectral type | G8IIIa[3] |
U−B color index | +0.75[2] |
B−V color index | +0.94[2] |
Variable type | Flare star[4] |
Astrometry | |
Radial velocity (Rv) | –18.35[5] km/s |
Proper motion (μ) | RA: –40.708 mas/yr[1] Dec.: –30.168 mas/yr[1] |
Parallax (π) | 13.878 ± 0.131 mas[1] |
Distance | 235 ± 2 ly (72.1 ± 0.7 pc) |
Absolute magnitude (MV) | –0.70[6] |
Details | |
Mass | 3.4 ± 0.2[4] M☉ |
Radius | 17.68[7] R☉ |
Luminosity | 170[5]–194[6] L☉ |
Surface gravity (log g) | 2.2[7] cgs |
Temperature | 4,997[7] K |
Metallicity [Fe/H] | –0.086[7] dex |
Rotation | 200 ± 10[4] days |
Rotational velocity (v sin i) | 4.10 ± 1.0[4] km/s |
Age | 240[4]–251[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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