HD 121474

HD 121474

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Centaurus
Right ascension	13^h 57^m 38.88181^s[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 mas[1]
Distance	212 ± 2 ly (65.1 ± 0.7 pc)
Absolute magnitude (MV)	0.67[4]
Details
Radius	12.76+0.18 −0.21[1] R☉
Luminosity	70.3±0.9[1] L☉
Surface gravity (log g)	2.75[2] cgs
Temperature	4,679+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
SIMBAD	data

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]

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, S2CID 119257644.
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, S2CID 14878976