Categories
  • Henry Draper Catalogue objects
  • Hipparcos objects
  • Bright Star Catalogue objects
    •   Encyclosphere.org ENCYCLOREADER
      supported by EncyclosphereKSF

    HD 85859

    Topic: Astronomy

     From Handwiki - Reading time: 3 min
    Short description: Star in the constellation Hydra
    HD 85859
    Observation data
    Equinox J2000.0]] (ICRS)
    Constellation Hydra
    Right ascension  09h 54m 12.32596s[1]
    Declination −25° 55′ 56.3631″[1]
    Apparent magnitude (V) 4.88[2]
    Characteristics
    Spectral type K2+ III CN0.5[3]
    B−V color index 1.23[2]
    Astrometry
    Radial velocity (Rv)50.5[2] km/s
    Proper motion (μ) RA: −187.764[1] mas/yr
    Dec.: +52.746[1] mas/yr
    Parallax (π)12.5809 ± 0.2161[1] mas
    Distance259 ± 4 ly
    (79 ± 1 pc)
    Absolute magnitude (MV)−0.23[4]
    Details
    Mass1.55[2] M☉
    Luminosity178[2] L☉
    Surface gravity (log g)2.35[5] cgs
    Temperature4,415±25[2] K
    Metallicity [Fe/H]−0.03[5] dex
    Age4.34[2] Gyr
    Other designations
    CD−25° 7585, FK5 2792, HD 85859, HIP 48559, HR 3919, SAO 178158[6]
    Database references
    SIMBADdata

    HD 85859 is a single[7] star in the equatorial constellation of Hydra. It has an apparent visual magnitude of 4.88,[2] which is bright enough to be visible to the naked eye. The distance to this star, as estimated from its annual parallax shift of 12.6 mas,[1] is 259 light years. It is moving away from the Earth with a heliocentric radial velocity of 50.5 km/s.[2]

    The stellar classification of the visible component is K2+ III CN0.5,[3] which matches an evolved K-type giant star with a mild overabundance of CN in the atmosphere. At the age of 4.34[2] billion years, it is a red clump star, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core.[8] The star has 1.55[2] times the mass of the Sun and is radiating 178[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,415 K.[2]

    References

    1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 
    2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal 150 (3). doi:10.1088/0004-6256/150/3/88. Bibcode: 2015AJ....150...88L. 
    3. ↑ 3.0 3.1 Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245–266, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K 
    4. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
    5. ↑ 5.0 5.1 Soubiran, C. et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics 515: A111, doi:10.1051/0004-6361/201014247, Bibcode: 2010A&A...515A.111S. 
    6. ↑ "HD 85859". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+85859. 
    7. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
    8. ↑ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A. 



    Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:HD_85859&oldid=3427320"
    This article is licensed under CC BY-SA 3.0.
    Original source: https://handwiki.org/wiki/HD 85859
    Status: article is cached
    Encyclosphere.org EncycloReader is supported by the EncyclosphereKSF