Rho Ceti

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.

Rho Ceti
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[1] mas
Distance460 ± 20 ly
(140 ± 5 pc)
Absolute magnitude (MV)−0.85[5]
Details
Radius3.1[6] R
Luminosity178[7] L
Temperature8,905[7] K
Rotational velocity (v sin i)219[8] km/s
Other designations
ρ Cet, 72 Cet, BD−12° 451, FK5 1066, HD 15130, HIP 11345, HR 708, SAO 148385.[9]
Database references
SIMBADdata

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]

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gollark: AI isn't good enough for that yet.
gollark: Because human is poorly designed.
gollark: Make your bowl from ice cream then.
gollark: There are uses for loads of the weird admin-created anomalies. The random reich tower is... free housing or alternately concrete, the bedrock spheres are... well, if hollow, nice buildings? The lava pools are free lava, obviously.

References

  1. 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.
  2. Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publ. Dept. Astron. Univ. Chile, Publicaciones Universidad de Chile, Department de Astronomy, 1: 1–17, Bibcode:1966PDAUC...1....1G.
  3. 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, Ann Arbor: Dept. of Astronomy, University of Michigan, 4, Bibcode:1988mcts.book.....H.
  4. 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, A61.
  5. 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.
  6. 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 (3rd ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  7. 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.
  8. 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.
  9. "rho Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-09.
  10. Belle, G. T. (2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20: 51. arXiv:1204.2572. Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2.
  11. 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.
  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
  13. (in Chinese) 夢之大地 @ 國立成功大學 WebBBS DreamLand @ National Cheng Kung University WebBBS System
  14. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 12 日
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