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    Eta Circini

    From Wikipedia - Reading time: 4 min
    η Circini
    Observation data
    Epoch J2000.0      Equinox J2000.0 (ICRS)
    Constellation Circinus
    Right ascension 15h 04m 48.18600s[1]
    Declination −64° 01′ 52.8611″[1]
    Apparent magnitude (V) 5.17[2]
    Characteristics
    Spectral type G8 III[3]
    B−V color index +0.93[2]
    Astrometry
    Radial velocity (Rv)44.8±0.8[4] km/s
    Proper motion (μ) RA: +102.65[1] mas/yr
    Dec.: +9.35[1] mas/yr
    Parallax (π)11.82 ± 0.30 mas[1]
    Distance276 ± 7 ly
    (85 ± 2 pc)
    Absolute magnitude (MV)+0.52[5]
    Details
    Luminosity64[6] L☉
    Surface gravity (log g)2.69±0.05[7] cgs
    Temperature4,954±22[7] K
    Metallicity [Fe/H]−0.37±0.02[7] dex
    Other designations
    η Cir, CPD−63° 3493, HD 132905, HIP 73776, HR 5593, SAO 253005.[8]
    Database references
    SIMBADdata

    Eta Circini, Latinized from η Circini, is the Bayer designation for a solitary[9] star located in the southern constellation of Circinus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.17.[2] The distance to this star, as determined from an annual parallax shift of 11.82 mas,[1] is around 276 light years.

    This is an evolved G-type giant star with a stellar classification of G8 III.[3] It is radiating an estimated 64[6] times the solar luminosity from its outer atmosphere at an effective temperature of 4,954 K.[7]

    References[edit]

    1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
    2. ^ a b c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
    3. ^ a b Houk, Nancy; Cowley, A. P. (1979), University of Michigan Catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
    4. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
    5. ^ 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.
    6. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
    7. ^ a b c d Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society, 448 (3): 2749–2765, arXiv:1503.02556, Bibcode:2015MNRAS.448.2749A, doi:10.1093/mnras/stv189.
    8. ^ "eta Cir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-01-18.{{cite web}}: CS1 maint: postscript (link)
    9. ^ 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.

    External links[edit]

    This article is licensed under CC BY-SA 3.0.
    Original source: https://en.wikipedia.org/wiki/Eta Circini
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