Astronomy:47 Aurigae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Adams, Walter S. et al. (1935), "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars", Astrophysical Journal 81: 187, doi:10.1086/143628, Bibcode: 1935ApJ....81..187A
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Feuillet, Diane K. et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal 817 (1): 40, doi:10.3847/0004-637X/817/1/40, Bibcode: 2016ApJ...817...40F.
- ↑ 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, doi:10.1051/aas:1999153, Bibcode: 1999A&AS..134..523T.
- ↑ "47 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=47+Aur.
- ↑ "Star Finder | Star-Registration.com" (in en). https://www.star-registration.com/pages/star-finder.
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