HD 85951

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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[1] mas
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

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

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. ^ a b c d e f g h 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. ^ a b c 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. ^ a b c 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. ^ a b "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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