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Mu Aurigae
Star in the constellation Auriga / From Wikipedia, the free encyclopedia
Mu Aurigae, Latinized as μ Aurigae, is the Bayer designation for an unconfirmed binary star[12] in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of +4.88.[2] Based upon an annual parallax shift of 20.7218±0.4971 mas as seen from Earth,[7] is located 157 light-years from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Auriga |
Right ascension | 05h 13m 25.71733s[1] |
Declination | +38° 29′ 04.1879″[1] |
Apparent magnitude (V) | +4.88[2] |
Characteristics | |
Spectral type | A4 Vm[3][4] (kA3hA8VmA8[5]) |
U−B color index | +0.10[2] |
B−V color index | +0.18[2] |
Astrometry | |
Radial velocity (Rv) | +26.0±1.2[6] km/s |
Proper motion (μ) | RA: −19.545[7] mas/yr Dec.: −72.456[7] mas/yr |
Parallax (π) | 20.7218 ± 0.4971 mas[7] |
Distance | 157 ± 4 ly (48 ± 1 pc) |
Absolute magnitude (MV) | +1.47[8] |
Details | |
Mass | 2.09[9] M☉ |
Radius | 3.15[7] R☉ |
Luminosity | 22.95[7] L☉ |
Surface gravity (log g) | 3.4[10] cgs |
Temperature | 7,500[10] K |
Metallicity [Fe/H] | −0.3[10] dex |
Rotational velocity (v sin i) | 80.0[10] km/s |
Age | 560[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an A-type main-sequence star with a stellar classification of A4 Vm;[4] the 'm' suffix indicating that abnormal abundances of heavier elements appear in the star's spectrum, making this an Am star. It is 560[9] million years old with a projected rotational velocity of 80 km/s.[10] It has double[9] the mass of the Sun and is radiating 23[7] times the Sun's luminosity at an effective temperature of 7,500 K.[10]
A very close companion has been reported using speckle interferometry,[12] but this remains unconfirmed. The separation at discovery in 1986 was 0.07 mas and it was measured at 0.066 mas in 1999. It was catalogued by Hipparcos as a problem binary, indicating that the measurements of its position were not consistent with the motion of a single star, but no satisfactory orbit could be found to match the motion[12]