| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 13h 57m 38.88358s[2] |
| Declination | −63° 41′ 12.1139″[2] |
| Apparent magnitude (V) | 4.701[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K1.5IIIb:[4] |
| B−V color index | +1.101[3] |
| Astrometry | |
| Radial velocity (Rv) | +21.86±0.12[2] km/s |
| Proper motion (μ) | RA: −40.640[2] mas/yr Dec.: −33.433[2] mas/yr |
| Parallax (π) | 15.2855±0.0804 mas[2] |
| Distance | 213 ± 1 ly (65.4 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.67[1] |
| Details | |
| Mass | 2.70±0.04[2] M☉ |
| Radius | 11.9±0.2[2] R☉ |
| Luminosity | 65.2±0.6[2] L☉ |
| Surface gravity (log g) | 2.75[3] cgs |
| Temperature | 4,753±4[2] K |
| Metallicity [Fe/H] | −0.01[3] dex |
| Age | 502[2] Myr |
| 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.[3] This object is located at a distance of approximately 213 light years based on parallax, and it has an absolute magnitude of 0.67.[1] It is drifting further away from the Sun with a radial velocity of +22 km/s.[2]
This is an aging giant star with a stellar classification of K1.5IIIb:,[4] having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. At present it has 12[2] times the girth of the Sun, with a near-solar metallicity of −0.01.[3] The star is radiating 65 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,753 K.[2]
References
[edit]- ^ a b c 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. XHIP record for this object at VizieR.
- ^ a b c d e f g h i j k l m n o Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f 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.
- ^ a b 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.
- ^ "HD 121474". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-30.
- ^ 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
