Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 06h 30m 02.97400s [1] |
Declination | +46° 41′ 08.0041″ [1] |
Apparent magnitude (V) | 5.88 [2] |
Characteristics | |
Evolutionary stage | giant |
Spectral type | K4 III [3] |
B−V color index | 1.448±0.008 [2] |
Astrometry | |
Radial velocity (Rv) | −48.32±0.20 [2] km/s |
Proper motion (μ) |
RA: −7.582
[1]
mas/
yr Dec.: +7.854 [1] mas/ yr |
Parallax (π) | 4.7747 ± 0.0978 mas [1] |
Distance | 680 ± 10
ly (209 ± 4 pc) |
Absolute magnitude (MV) | −0.47 [2] |
Details | |
Mass | 1.40±0.41 [4] M☉ |
Radius | 35.9+2.5 −2.0 [1] R☉ |
Luminosity | 357.7±8.9 [1] L☉ |
Surface gravity (log g) | 1.57±0.11 [4] cgs |
Temperature | 4,157±92 [4] K |
Metallicity [Fe/H] | −0.218±0.093 [5] dex |
Age | 2.14+0.95 −0.66 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
47 Aurigae ( Lord RICHARD [7]) is a star located around 680 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.88. [2] This object is moving closer to the Earth with a heliocentric radial velocity of −48 km/s, and is expected to come to within 111 ly in around 3.6 million years. [2]
This object is an aging giant star with a stellar classification of K4 III, [3] having exhausted the hydrogen supply at its core then expanded to 36 [1] times the Sun's radius. It is roughly two [4] billion years old with 1.4 [4] times the mass of the Sun. The star is radiating 358 [1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,157 K. [4]