2 Piscis Austrini

2 Piscis Austrini, also known as HR 8076, is a single[7] star located approximately 351[1] light years away in the southern constellation of Microscopium, despite its Flamsteed designation. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.2.[2]

2 Piscis Austrini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 15h 17m 24.67716s[1]
Declination −30° 08′ 29.8343″[1]
Apparent magnitude (V) 5.203[2]
Characteristics
Evolutionary stage horizontal branch
Spectral type K3 III[3]
B−V color index 1.104±0.004[4]
Astrometry
Radial velocity (Rv)+3.1±2.8[4] km/s
Proper motion (μ) RA: −5.837[1] mas/yr
Dec.: +8.176[1] mas/yr
Parallax (π)9.3039 ± 0.1332[1] mas
Distance351 ± 5 ly
(107 ± 2 pc)
Absolute magnitude (MV)0.19[4]
Details
Mass1.91[2] M☉
Luminosity107[2] L☉
Surface gravity (log g)2.640[5] cgs
Temperature4,632±24[2] K
Metallicity [Fe/H]−0.010[5] dex
Age1.98[2] Gyr
Other designations
2 PsA, CD−32°16398, GC 29465, HD 200763, HIP 104174, HR 8076, SAO 212716[6]
Database references
SIMBADdata

This is an aging giant star with a stellar classification of K3 III.[3] At the age of 2[2] billion years, it is a red clump giant, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core.[8] The star has 1.91[2] times the mass of the Sun and is radiating 107[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,632 K.[2]

References
  1. 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.
  2. Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
  3. Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
  4. 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.
  5. 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.
  6. "HD 200763". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-08.
  7. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  8. Alves, David R. (August 2000). "K-Band Calibration of the Red Clump Luminosity". The Astrophysical Journal. 539 (2): 732–741. arXiv:astro-ph/0003329. Bibcode:2000ApJ...539..732A. doi:10.1086/309278. S2CID 16673121.
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