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Variable star in the constellation Auriga From Wikipedia, the free encyclopedia
Nu Aurigae, Latinised from ν Aurigae, is the Bayer designation for a star in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of 3.96[2] and is approximately 200 light-years (61 parsecs) distant from the Earth.[1] This is an evolved giant star with a stellar classification of G9.5 III.[9] It is a red clump star, which indicates that it is generating energy through the fusion of helium at its core.[10] The outer envelope has expanded to 18 times the radius of the Sun and cooled to 4,576 K,[7] giving it the characteristic yellow-hued glow of a G-type star.[11] It shines with 126 times the luminosity of the Sun.[7]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 05h 51m 29.36946s[1] |
Declination | +39° 08′ 54.6861″[1] |
Apparent magnitude (V) | 3.957[2] |
Characteristics | |
Spectral type | G9.5 III Fe1 Ba0.2 + wd[3] |
U−B color index | +1.084[2] |
B−V color index | +1.138[2] |
R−I color index | 0.56 |
Astrometry | |
Radial velocity (Rv) | +9.92 ± 0.14[4] km/s |
Proper motion (μ) | RA: +7.958 mas/yr[1] Dec.: +0.713 mas/yr[1] |
Parallax (π) | 16.1414 ± 0.4427 mas[1] |
Distance | 202 ± 6 ly (62 ± 2 pc) |
Absolute magnitude (MV) | −0.27[5] |
Details | |
Mass | 2.12[6] M☉ |
Radius | 17.85+0.51 −0.53[7] R☉ |
Luminosity | 126±8[7] L☉ |
Surface gravity (log g) | 2.4[4] cgs |
Temperature | 4,576±50[7] K |
Metallicity [Fe/H] | –0.14[4] dex |
Rotational velocity (v sin i) | 5.0[4] km/s |
Age | 1.11[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This is an astrometric binary with a suspected white dwarf companion.[3] A 10th-magnitude star 54.6 arcseconds away is an optical companion.
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