Psi Capricorni
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 20h 46m 05.73263s[1] |
| Declination | −25° 16′ 15.2312″[1] |
| Apparent magnitude (V) | 4.13[2] |
| Characteristics | |
| Spectral type | F5 V[3] |
| U−B color index | −0.03[2] |
| B−V color index | 0.42[2] |
| Astrometry | |
| Radial velocity (Rv) | +20.3[4] km/s |
| Proper motion (μ) | RA: −51.96[1] mas/yr Dec.: −156.56[1] mas/yr |
| Parallax (π) | 68.13 ± 0.27[1] mas |
| Distance | 47.9 ± 0.2 ly (14.68 ± 0.06 pc) |
| Details | |
| Surface gravity (log g) | 4.50[5] cgs |
| Temperature | 6,632[5] K |
| Metallicity [Fe/H] | −0.11[5] dex |
| Rotational velocity (v sin i) | 40.9 ± 2.0[6] km/s |
| Age | 1.4[3] Gyr |
| Other designations | |
Psi Capricorni (ψ Cap, ψ Capricorni) is a star in the constellation Capricornus. ψ Capricorni is a yellow-white F-type main sequence dwarf with an apparent magnitude of +4.13. It is approximately 47.9 light years from Earth. The measured rotational velocity of this star is approximately 41 km/s[6] (the Sun has an equatorial rotation velocity of 2 km/s). Analysis of the line profile of the star's spectrum indicates that it is undergoing differential rotation, with the variation by latitude being similar to the Sun.[8]
Chinese name
In Chinese, 天田 (Tiān Tián), meaning Celestial Farmland, refers to an asterism consisting of ψ Capricorni, ω Capricorni, 3 Piscis Austrini, and 24 Capricorni.[9] Consequently, ω Capricorni itself is known as 天田四 (Tiān Tián sì, English: the Fourth Star of Celestial Farmland.)[10]
In R. H. Allen's version, this star represented the state Yue.[11]
References
- 1 2 3 4 5 van Leeuwen, F. (November 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. - 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M.
- 1 2 Ehrenreich, D.; et al. (November 2010), "Deep infrared imaging of close companions to austral A- and F-type stars", Astronomy and Astrophysics, 523: A73, arXiv:1007.0002, Bibcode:2010A&A...523A..73E, doi:10.1051/0004-6361/201014763
- ↑ Nordström, B.; et al. (2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs", Publications of the Astronomical Society of Australia, 21 (2): 129–133, Bibcode:2004PASA...21..129N, doi:10.1071/AS04013.
- 1 2 3 Boesgaard, Ann Merchant; et al. (March 1990), "Chemical composition of open clusters. I - Fe/H from high-resolution spectroscopy", Astrophysical Journal, Part 1, 351: 467–479, Bibcode:1990ApJ...351..467B, doi:10.1086/168484.
- 1 2 Ammler-von Eiff, M.; Reiners, A. (2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: 31, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, A116.
- ↑ "psi Cap -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2014-05-21.
- ↑ Reiners, A.; et al. (September 2001), "Detection of differential rotation in psi Cap with profile analysis", Astronomy and Astrophysics, 376: L13–L16, arXiv:astro-ph/0107332, Bibcode:2001A&A...376L..13R, doi:10.1051/0004-6361:20011023.
- ↑ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日
- ↑ Star Names - R.H.Allen p.142
External links
- "HD 197692 -- Star". SIMBAD: Centre de Données astronomiques de Strasbourg. Retrieved 2006-08-16.
- "4C01688". ARICNS. 1998-03-04. Retrieved 2006-08-16.