| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 25m 57.00560s [1] |
| Declination | −12° 17′ 25.7104″ [1] |
| Apparent magnitude (V) | 4.885 [2] |
| Characteristics | |
| Spectral type | A0 V [3] |
| U−B color index | +0.001 [2] |
| B−V color index | −0.037 [2] |
| Astrometry | |
| Radial velocity (Rv) | +18.9±2.0 [4] km/s |
| Proper motion (μ) |
RA: −11.28
[1]
mas/
yr Dec.: −9.48 [1] mas/ yr |
| Parallax (π) | 7.15 ± 0.26 mas [1] |
| Distance | 460 ± 20
ly (140 ± 5 pc) |
| Absolute magnitude (MV) | −0.85 [5] |
| Details | |
| Radius | 3.1 [6] R☉ |
| Luminosity | 178 [7] L☉ |
| Temperature | 8,905 [7] K |
| Rotational velocity (v sin i) | 219 [8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho Ceti , Latinized from ρ Ceti, is the Bayer designation for a star in the equatorial constellation of Cetus. It is faintly visible to the naked eye with an apparent visual magnitude of 4.885. [2] The distance to this star, based upon an annual parallax shift of 7.15 mas, [1] is around 460 light years.
This is an A-type main sequence star with a stellar classification of A0 V. [3] It is spinning rapidly with a projected rotational velocity of 219 [8] km/s, giving the star an oblate shape with an equatorial bulge that is 10% larger than the polar radius. [10] The star has an estimated size 3.1 [6] times the radius of the Sun and is radiating 178 times the solar luminosity from its outer atmosphere at an effective temperature of 8,905 K. [7]
Name
This star, along with π Cet, ε Cet and σ Cet, was Al Sufi's Al Sadr al Ḳaiṭos, the Whale's Breast [11]
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Sadr al Ḳaiṭos were the title for four stars :this star (ρ Cet) as Al Sadr al Ḳaiṭos I, σ Cet as Al Sadr al Ḳaiṭos II, ε Cet as Al Sadr al Ḳaiṭos III and π Cet as Al Sadr al Ḳaiṭos IV [12]
In Chinese, 芻蒿 (Chú Hāo), meaning Hay, refers to an asterism consisting of ρ Ceti, 77 Ceti, 67 Ceti, 71 Ceti, HD 14691 [13] and ε Cet. Consequently, the Chinese name for ρ Ceti itself is 芻蒿一 (Chú Hāo yī, English: the First Star of Celestial Meadows. [14]
References
- ^ a b c d e f 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.
- ^ a b c d Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publ. Dept. Astron. Univ. Chile, 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, Bibcode: 1966PDAUC...1....1G.
- ^ a b Houk, Nancy; Smith-Moore, M. (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ 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.
- ^ a b Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (3rd ed.): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ a b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv: astro-ph/0610785, Bibcode: 2007A&A...463..671R, doi: 10.1051/0004-6361:20065224, S2CID 18475298.
- ^ "rho Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-09.
- ^ Belle, G. T. (2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv: 1204.2572. Bibcode: 2012A&ARv..20...51V. doi: 10.1007/s00159-012-0051-2. S2CID 119273474.
- ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 162. ISBN 0-486-21079-0. Retrieved 2010-12-12.
- ^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
- ^ (in Chinese) 夢之大地 @ 國立成功大學 WebBBS DreamLand @ National Cheng Kung University WebBBS System
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 12 日
External links
- http://www.alcyone.de/SIT/bsc/HR0708.html
- http://server3.wikisky.org/starview?object_type=1&object_id=1611
