HD 123569

HD 123569 is a single[6] star in the southern constellation of Centaurus, positioned near the eastern constellation border with Lupus. This object has a yellowish hue and is visible to the naked eye with an apparent visual magnitude of 4.74.[2] It is located at a distance of approximately 176 light years from the Sun based on parallax, and it has an absolute magnitude of +1.00.[1] The star is drifting closer with a radial velocity of −17 km/s.[1] O. J. Eggen flagged this star as a member of the Hyades Supercluster.[7]

HD 123569
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension  14h 09m 54.81470s[1]
Declination −53° 26′ 20.2220″[1]
Apparent magnitude (V) 4.74[2]
Characteristics
Spectral type G9-III[3]
B−V color index +0.938±0.004[2]
Astrometry
Radial velocity (Rv)−17.09±0.15[1] km/s
Proper motion (μ) RA: −145.400[1] mas/yr
Dec.: −89.971[1] mas/yr
Parallax (π)18.5021 ± 0.1699[1] mas
Distance176 ± 2 ly
(54.0 ± 0.5 pc)
Absolute magnitude (MV)1.00[1]
Details
Radius8.25+0.24
−0.28[1] R☉
Luminosity40.242±0.441[1] L☉
Surface gravity (log g)3.13±0.08[4] cgs
Temperature5,089±31[4] K
Metallicity [Fe/H]+0.07±0.03[4] dex
Other designations
CPD−52°7028, HD 123569, HIP 69191, HR 5297, SAO 241496, WDS J14099-5326A[5]
Database references
SIMBADdata

This is an aging giant star with a stellar classification of G9-III,[3] having exhausted the supply of hydrogen at its core then evolved off the main sequence by cooling and expanding. At present it has around 8.25[1] times the girth of the Sun, with a slightly higher than solar metallicity – what astronomers term the abundance of elements with a higher atomic number than helium.[4] The star is radiating 40 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5089 K.[1]

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. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. 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.
  5. "HD 123569". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-01.
  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. Eggen, O. J. (February 1983), "NGC 2423 and the red giants of the Hyades supercluster", Astronomical Journal, 88: 190-196, Bibcode:1983AJ.....88..190E, doi:10.1086/113305.
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