Location of σ Capricorni (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 20 19 23.60402 |
| Declination | −19° 07′ 06.6967″ |
| Apparent magnitude (V) | +5.31 |
| Characteristics | |
| Spectral type | K2 III |
| U−B color index | +1.56 |
| B−V color index | +1.43 |
| Astrometry | |
| Radial velocity (Rv) | −9.64±0.16 km/s |
| Proper motion (μ) | RA: +8.07 mas/yr Dec.: −11.31 mas/yr |
| Parallax (π) | 3.0609 ± 0.1194 mas |
| Distance | 1,070 ± 40 ly (330 ± 10 pc) |
| Absolute magnitude (MV) | −2.38 |
| Details | |
| Mass | 6.3±0.7 M☉ |
| Radius | 67.5+4.2 −6.0 R☉ |
| Luminosity | 1,392±64 L☉ |
| Temperature | 4292+204 −127 K |
| Age | 60.5±17.2 Myr |
| Other designations | |
| σ Cap, CD−19°5776, FK5 3625, HD 193150, HIP 100195, HR 7761, SAO 163445, WDS J20194-1907A | |
| Database references | |
| SIMBAD | data |
Sigma Capricorni, Latinized from σ Capricorni, is a solitary star in the southern constellation of Capricornus, 0.5 degree north of the ecliptic. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of +5.31. The star is about 1,070 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −9.6 km/s.
This object is an evolved, K-type giant star with a stellar classification of K2 III. Having exhausted the supply of hydrogen at its core, it has expanded and now has around 67.5 times the girth of the Sun. The star is about 60.5 million years old with 6.3 times the mass of the Sun. It is radiating 1,392 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,292 K.
A magnitude 9.43 visual companion is at an angular separation of 55.90″ along a position angle of 179°, as of 2016.
References
- ^ 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.
- ^ Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7–22, Bibcode:1983ApJS...52....7F, doi:10.1086/190856.
- ^ Houk, N.; Smith-Moore, M. (1988), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, vol. 4, Bibcode:1988mcts.book.....H.
- ^ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- 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.
- ^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ "* sig Cap". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-05-12.
{{cite web}}: CS1 maint: postscript (link) - 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.
- Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
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