HD 15920

HD 15920 is a single[6] star in the northern constellation of Cassiopeia. It has a yellow hue and is visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.17.[2] This object is located at a distance of approximately 268 light years from the Sun based on parallax, but it is drifting closer with a radial velocity of −4 km/s.[1]

HD 15920
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 02h 38m 02.03097s[1]
Declination +72° 49′ 05.7106″[1]
Apparent magnitude (V) 5.17[2]
Characteristics
Spectral type G8III[3]
B−V color index +0.896±0.003[2]
Astrometry
Radial velocity (Rv)−3.69±0.13[1] km/s
Proper motion (μ) RA: −27.441[1] mas/yr
Dec.: +15.627[1] mas/yr
Parallax (π)12.1723 ± 0.1139[1] mas
Distance268 ± 3 ly
(82.2 ± 0.8 pc)
Absolute magnitude (MV)0.70[2]
Details
Mass2.55±0.68[4] M☉
Radius10.06+0.15
−0.17[1] R☉
Luminosity60.7±0.7[1] L☉
Surface gravity (log g)2.91±0.11[4] cgs
Temperature5,080+37
−42[1] K
Metallicity [Fe/H]0.02±0.05[4] dex
Age977+198
−164[4] Myr
Other designations
BD+72°140, FK5 87, GC 3116, HD 15920, HIP 12273, HR 743, SAO 4694, GSC 04320-02109[5]
Database references
SIMBADdata

This object is an aging giant star with a stellar classification of G8III.[3] After exhausting the supply of hydrogen at its core, this star has cooled and expanded off the main sequence – at present it has ten times the girth of the Sun.[1] The star is around a billion years old[4] with 2.6[4] times the mass of the Sun. It is radiating 61 times the Sun's luminosity from its swollen photosphere at an effective temperature of 5,080 K.[1] HD 15920 is the most likely source for the X-ray emission detected at these coordinates.[7]

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. 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.
  3. Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.
  4. Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817: 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40.
  5. "HD 15920". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-16.
  6. 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.
  7. Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138.
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