Astronomy:41 Capricorni
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 28m 43.40070s[1] |
| Declination | −21° 48′ 25.8504″[1] |
| Apparent magnitude (V) | +5.24[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| B−V color index | 0.991±0.002[4] |
| Astrometry | |
| Radial velocity (Rv) | −45.1±1.3[4] km/s |
| Proper motion (μ) | RA: +134.83[1] mas/yr Dec.: −5.73[1] mas/yr |
| Parallax (π) | 19.06 ± 0.29[1] mas |
| Distance | 171 ± 3 ly (52.5 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.99[4] |
| Details | |
| Mass | 2.55[2] M☉ |
| Luminosity | 48.25[4] L☉ |
| Surface gravity (log g) | 3.05[5] cgs |
| Temperature | 4,910[5] K |
| Metallicity [Fe/H] | −0.01[5] dex |
| Age | 550[2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
41 Capricorni is a binary star[7] system in the southern constellation of Capricornus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.24.[2] The distance to this star, based upon an annual parallax shift of 19.06±0.29 mas,[1] is around 171 light years. It is moving closer with a heliocentric radial velocity of −45 km/s.[4]
This is a yellow K-type giant star with a stellar classification of K0 III.[3] At the age of around 550[2] million years it has become a red clump star,[8] which indicates it is generating energy via helium fusion at its core. It has an estimated 2.55[2] times the mass of the Sun and is radiating 48[4] times the Sun's luminosity from its photosphere at an effective temperature of 4,910 K.[5] The magnitude 11.5 companion lies at an angular separation of 5.5″, as of 2008.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Takeda, Yoichi et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan 60 (4): 781–802, doi:10.1093/pasj/60.4.781, Bibcode: 2008PASJ...60..781T.
- ↑ 3.0 3.1 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 5.2 5.3 Soubiran, C. et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics 515: A111, doi:10.1051/0004-6361/201014247, Bibcode: 2010A&A...515A.111S.
- ↑ "41 Cap". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=41+Cap.
- ↑ 7.0 7.1 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.
- ↑ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A.
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