Summary
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]
| 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 |
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]
References edit
- ^ a b c d e f g h i Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Adams, Walter S.; et al. (1935), "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars", Astrophysical Journal, 81: 187, Bibcode:1935ApJ....81..187A, doi:10.1086/143628
- ^ a b c d e f g Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40, S2CID 118675933.
- ^ Taylor, B. J. (February 1999), "Catalogs of temperatures and [Fe/H] averages for evolved G and K stars", Astronomy and Astrophysics Supplement, 134 (3): 523–524, Bibcode:1999A&AS..134..523T, doi:10.1051/aas:1999153.
- ^ "47 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-23.
- ^ "Star Finder | Star-Registration.com". Star-Registration. Retrieved 2023-03-13.