HD 85951

HD 85951 (HR 3923),formally named Felis /ˈfiːlɪs/,[8] is a star in the constellation Hydra. With an apparent magnitude of 4.95, it's faintly visible under ideal conditions. Based on parallax measurements it is about 530 light-years (162 parsecs) from the Sun, but is drifting away with a heliocentric radial velocity of 50 km/s

HD 85951
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 09h 54m 52.21s[1]
Declination −19° 00′ 33.61″[1]
Apparent magnitude (V) 4.94[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.93[2]
B−V color index +1.57[2]
Astrometry
Radial velocity (Rv)50±4[4] km/s
Proper motion (μ) RA: −47.445±0.380[1] mas/yr
Dec.: −41.155±0.404[1] mas/yr
Parallax (π)6.2052 ± 0.2415 mas[1]
Distance530 ± 20 ly
(161 ± 6 pc)
Absolute magnitude (MV)-1.43[5]
Details
Mass1.12[6] M☉
Radius56.77+2.97
−4.15[1] R☉
Luminosity721±32[1] L☉
Surface gravity (log g)0.89[6] cgs
Temperature3,970+123
−100[1] K
Metallicity [Fe/H]+0.02[6] dex
Other designations
Felis, BD−18° 2810, FK5 373, HIP 48615, HR 3923, SAO 155588[7]
Database references
SIMBADdata

Nomenclature

HD 85951 was the brightest star in the now-obsolete constellation of Felis.[9] In 2016, the IAU organized a Working Group on Star Names (WGSN)[10] to catalog and standardize proper names for stars. The WGSN approved the name Felis for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[8]

Properties

This star is a K-type orange giant with a stellar classification of K5 III, which states that it has exhausted hydrogen at its core and left the main sequence. HD 85951 has a similar mass to our Sun, but has expanded to 57 times the Sun's radius. It radiates at a luminosity 721 times greater from its enlarged photosphere at an effective temperature of 3,970 Kelvin, which gives it a typical orange-yellow hue of a K-type star.

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. Ducati, J. R. (1 January 2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog.
  3. Houk, N.; Smith-Moore, M. (1 January 1988). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0". 4. {{cite journal}}: Cite journal requires |journal= (help)
  4. Gontcharov, G. A. (1 November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32: 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737.
  5. Anderson, E.; Francis, Ch. (1 May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38: 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737.
  6. Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
  7. "HD 85951". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 September 2012.
  8. "Naming Stars". IAU.org. Retrieved 18 June 2018.
  9. "Star Tales Felis". Retrieved 16 January 2021.
  10. "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
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