Psi2 Aurigae
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 06h 39m 19.82724s[2] |
| Declination | +42° 29′ 19.9557″[2] |
| Apparent magnitude (V) | 4.79[3] |
| Characteristics | |
| Spectral type | K2- III[4] |
| U−B color index | +1.30[3] |
| B−V color index | +1.23[3] |
| R−I color index | 0.6[citation needed] |
| Astrometry | |
| Radial velocity (Rv) | 16.09±0.19[5] km/s |
| Proper motion (μ) | RA: −0.576 mas/yr[2] Dec.: −55.657 mas/yr[2] |
| Parallax (π) | 8.0927±0.1314 mas[2] |
| Distance | 403 ± 7 ly (124 ± 2 pc) |
| Absolute magnitude (MV) | −0.72[1] |
| Details | |
| Mass | 4.1[2] M☉ |
| Radius | 31[2] R☉ |
| Luminosity | 304[1] L☉ |
| Surface gravity (log g) | 2.30[6] cgs |
| Temperature | 4,410[6] K |
| Metallicity [Fe/H] | −0.10[6] dex |
| Rotational velocity (v sin i) | 1.0[7] km/s |
| Age | 372[8] Myr |
| Other designations | |
| ψ2 Aur, 50 Aurigae, BD+42 1585, GC 8662, HD 47174, HIP 31832, HR 2427, SAO 41239, PPM 49219, WDS J06393+4229A[9] | |
| Database references | |
| SIMBAD | data |
Psi2 Aurigae is a star in the constellation Auriga. Its name is a Bayer designation that is Latinized from ψ2 Aurigae, and abbreviated Psi2 Aur or ψ2 Aur. This star is faintly visible to the naked eye with an apparent visual magnitude of 4.79.[3] Based upon parallax measurements, it is approximately 403 light-years (124 parsecs) away from the Earth.[2] At that distance, the brightness of the star is diminished by 0.07 in magnitude from extinction caused by interstellar gas and dust.[5] ψ2 Aur is drifting further away from the Sun with a radial velocity of 16 km/s.[5]
This is as a evolved K-type giant star with a stellar classification of K2 III.[4] At an estimated age of 372 million years,[8] it has exhausted the supply of hydrogen at its core and expanded to 31 times the radius of the Sun.[2] It has 4.1 times the Sun's mass[2] and is radiating 304 times the Sun's luminosity[1] from its enlarged photosphere at an effective temperature of 4,410 K.[6]
ψ2 Aurigae was part of a much bigger constellation named Telescopium Herschelii. It was the constellation's second-brightest star before it fell out of use.[10]
References
[edit]- ^ a b c d 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. XHIP record for this object at VizieR.
- ^ a b c d e f g h i Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (October 1989), "The Perkins Catalog of Revised MK Types for the Cooler Stars", The Astrophysical Journal Supplement Series, 71: 245, doi:10.1086/191373, ISSN 0067-0049.
- ^ a b c Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
- ^ a b c d McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
- ^ De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
- ^ a b 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.
- ^ "* 50 Aur", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 24 March 2016.
- ^ Ridpath, Ian, "Telescopium Herschelii", Star Tales, Self-published, retrieved 2016-03-08.
