Astronomy:24 Capricorni
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 07m 07.66733s[1] |
| Declination | −25° 00′ 21.0790″[1] |
| Apparent magnitude (V) | +4.49[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M1− III[4] |
| B−V color index | 1.604±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | +32.1±0.8[2] km/s |
| Proper motion (μ) | RA: −28.09[1] mas/yr Dec.: −44.14[1] mas/yr |
| Parallax (π) | 7.15 ± 0.22[1] mas |
| Distance | 460 ± 10 ly (140 ± 4 pc) |
| Absolute magnitude (MV) | −1.24[2] |
| Details | |
| Radius | 54.06+1.88 −2.72[5] R☉ |
| Luminosity | 611±41[5] L☉ |
| Temperature | 3,903+102 −66[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
24 Capricorni or A Capricorni is a single[8] star in the southern constellation of Capricornus. This object is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude of +4.49.[2] It is approximately 460 light years from the Sun, based on parallax.[1] The star is moving further from the Earth with a heliocentric radial velocity of +32 km/s.[2]
This is an aging red giant, currently on the asymptotic giant branch,[3] with a stellar classification of M1− III;[4] a star that has exhausted the supply of hydrogen at its core and expanded to 54[5] times the Sun's radius. It is radiating 611[5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,903 K.[5]
Chinese name
In R. H. Allen's book, this star is described as having the Chinese name Tsoo, representing the state of Chu,[9] though other sources identify φ Capricorni as Chu.[10] Bayer described it as one of the last three stars of the tail of the goat, although this is not how they appear in modern visual representations of the constellation.[9]
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 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode: 1992AJ....104..275E.
- ↑ 4.0 4.1 Keenan, P. C.; McNeil, R. C. (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 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.
- ↑ Benjamin Apthorp Gould, URANOMETRIA ARGENTINA, http://www.uranometriaargentina.com/, retrieved 2019-06-10.
- ↑ "24 Cap". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=24+Cap.
- ↑ 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.
- ↑ 9.0 9.1 R.H.Allen, Star Names, p. 142, https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Capricornus*.html, retrieved 2019-06-10.
- ↑ Ridpath, Ian. "Star Tales − Capricornus". http://ianridpath.com/startales/capricornus.html.
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