Astronomy:HD 121474
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 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, doi:10.1093/mnras/256.3.535, Bibcode: 1992MNRAS.256..535J.
- ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ "HD 121474". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+121474.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E
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