Astronomy:HD 120213
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 13h 55m 38.8756s[1] |
| Declination | −82° 39′ 58.2871″[1] |
| Apparent magnitude (V) | 5.94[2] |
| Characteristics | |
| Spectral type | K2 III: CN−1 CH −2.5[3] |
| U−B color index | +1.59[2] |
| B−V color index | +1.45[2] |
| Astrometry | |
| Radial velocity (Rv) | −35.2±0.6[4] km/s |
| Proper motion (μ) | RA: −24.805[1] mas/yr Dec.: −23.580[1] mas/yr |
| Parallax (π) | 3.585 ± 0.0375[1] mas |
| Distance | 910 ± 10 ly (279 ± 3 pc) |
| Absolute magnitude (MV) | −0.98[5] |
| Details | |
| Mass | 4.2+1.2−0.7[6] M☉ |
| Radius | 38.6+7.5−5.1[7] R☉ |
| Luminosity | 503±13[7] L☉ |
| Surface gravity (log g) | 1.95±0.26[6] cgs |
| Temperature | 4,401+327−376[7] K |
| Metallicity [Fe/H] | −0.25±0.10[6] dex |
| Rotational velocity (v sin i) | <1[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 120213 (HR 5188) is a solitary star in the southern circumpolar constellation Chamaeleon. It is faintly visible to the naked eye with an apparent magnitude of 5.94 and is estimated to be 910 light years away from the Solar System. However, the object is drifting closer with a heliocentric radial velocity of −35 km/s.
HD 120213 has a stellar classification of K2 III: CN−1 CH −2.5,[3] indicating that its a red giant with an under abundance of CH molecules and cyano radicals in its spectrum. It has also been classified as a mild barium star,[11] but there is uncertainty about the spectral class. It has 4.2 times the mass of the Sun[6] and an enlarged radii of 38.6 R☉.[7] It shines at 503 times the luminosity of the Sun from its photosphere at an effective temperature of 4,401 K,[7] giving it an orange hue. HD 120213 has a metallicity 56% that of the Sun[6] and spins with a projected rotational velocity too low to be accurately measured.[8]
References
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. ISSN 0067-0049. Bibcode: 1989ApJS...71..245K.
- ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 6.3 6.4 Palacios, A.; Jasniewicz, G.; Masseron, T.; Thévenin, F.; Itam-Pasquet, J.; Parthasarathy, M. (16 February 2016). "New determination of abundances and stellar parameters for a set of weakG-band stars". Astronomy & Astrophysics 587: A42. doi:10.1051/0004-6361/201526566. ISSN 0004-6361. Bibcode: 2016A&A...587A..42P.
- ↑ 7.0 7.1 7.2 7.3 7.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 8.0 8.1 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D.
- ↑ "HD 120213". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+120213.
- ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino 1. Bibcode: 1879RNAO....1.....G.
- ↑ Lu, Phillip K. (June 1991). "Taxonomy of barium stars". The Astronomical Journal 101: 2229. doi:10.1086/115845. ISSN 0004-6256. Bibcode: 1991AJ....101.2229L.
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