Psi2 Aurigae
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 39m 19.82724s[1] |
| Declination | +42° 29′ 19.9557″[1] |
| Apparent magnitude (V) | 4.79[2] |
| Characteristics | |
| Spectral type | K2- III[3] |
| U−B color index | +1.30[2] |
| B−V color index | +1.23[2] |
| R−I color index | 0.6 |
| Astrometry | |
| Radial velocity (Rv) | 16.09±0.19[4] km/s |
| Proper motion (μ) | RA: −0.576[1] mas/yr Dec.: −55.657[1] mas/yr |
| Parallax (π) | 8.0927±0.1314 mas[1] |
| Distance | 403 ± 7 ly (124 ± 2 pc) |
| Absolute magnitude (MV) | −0.72[5] |
| Details | |
| Mass | 4.1[1] M☉ |
| Radius | 31[1] R☉ |
| Luminosity | 304[5] 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, HD 47174, HIP 31832, HR 2427, SAO 41239.[9] | |
| Database references | |
| SIMBAD | data |
Psi2 Aurigae, Latinized from ψ2 Aurigae, is a star in the constellation Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.79.[2] Based upon parallax measurements, this star is approximately 400 light-years (120 parsecs) away from the Earth. At that distance, the brightness of the star is diminished by 0.07 in magnitude from extinction caused by interstellar gas and dust.[4]
This is as a K-type giant star with a stellar classification of K2 III.[3] The measured angular diameter of this star, after correction for limb darkening, is 1.97±0.02 mas.[10] At the estimated distance of this star, this yields a physical size of about 31 times the radius of the Sun. It is radiating 304 times the Sun's luminosity[5] 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.[11]
References
[edit]- ^ a b c d e f g 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. (1989-10-01), "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 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 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 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.
- ^ Feuillet, Diane K.; Bovy, Jo; Holtzman, Jon; Girardi, Léo; MacDonald, Nick; Majewski, Steven R.; Nidever, David L. (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.
- ^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
- ^ Ridpath, Ian. "Telescopium Herschelii". Star Tales. Self-published. Retrieved 8 March 2016.
