HD 121474

HD 121474 is a single[6] star in the southern constellation of Centaurus, near the southern constellation border with Circinus. It is an orange-hued star and is faintly visible to the naked eye with an apparent visual magnitude of 4.70.[2] This object is located at a distance of approximately 212 light years based on parallax, and it has an absolute magnitude of 0.67.[4] It is drifting further away from the Sun with a radial velocity of +22 km/s.[1]

HD 121474
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension  13h 57m 38.88181s[1]
Declination −63° 41′ 12.1069″[1]
Apparent magnitude (V) 4.701[2]
Characteristics
Spectral type K1.5IIIb:[3]
B−V color index +1.101[2]
Astrometry
Radial velocity (Rv)+21.90±0.17[1] km/s
Proper motion (μ) RA: −39.880[1] mas/yr
Dec.: −33.867[1] mas/yr
Parallax (π)15.3516 ± 0.1607[1] mas
Distance212 ± 2 ly
(65.1 ± 0.7 pc)
Absolute magnitude (MV)0.67[4]
Details
Radius12.76+0.18
−0.21[1] R☉
Luminosity70.3±0.9[1] L☉
Surface gravity (log g)2.75[2] cgs
Temperature4,679+40
−32[1] K
Metallicity [Fe/H]−0.01[2] dex
Other designations
CPD−63°3070, FK5 514, HD 121474, HIP 68191, HR 5241, SAO 252531[5]
Database references
SIMBADdata

This is an aging giant star with a stellar classification of K1.5IIIb:,[3] having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. At present it has 13[1] times the girth of the Sun, with a near-solar metallicity of −0.01.[2] The star is radiating 70 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,679 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. Jones, K. L.; et al. (June 1992), "Spectroscopic investigation of cool giants and the authenticity of their reported microwave emission", Monthly Notices of the Royal Astronomical Society, 256 (3): 535–544, Bibcode:1992MNRAS.256..535J, doi:10.1093/mnras/256.3.535.
  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. 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.
  5. "HD 121474". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-30.
  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
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