Rho Ceti

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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]
Spectral type A0 V[3]
U−B color index +0.001[2]
B−V color index −0.037[2]
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
Distance 460 ± 20 ly
(140 ± 5 pc)
Radius 3.1[5] R
Luminosity 178[6] L
Temperature 8,905[6] K
Rotational velocity (v sin i) 219[7] km/s
Other designations
ρ Cet, 72 Cet, BD−12° 451, FK5 1066, HD 15130, HIP 11345, HR 708, SAO 148385.[8]

Rho Ceti (ρ Ceti), is the Bayer designation for 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[7] km/s, giving the star an oblate shape with an equatorial bulge that is 10% larger than the polar radius.[9] The star has an estimated size 3.1[5] 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.[6]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Gutierrez-Moreno, Adelina; et al. (1966), A System of photometric standards, 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode:1966PDAUC...1....1G. 
  3. ^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988MSS...C04....0H. 
  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:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ 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 (3rd ed.), 367: 521–524, arXiv:astro-ph/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  6. ^ 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:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  7. ^ 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/0610785Freely accessible, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224. 
  8. ^ "rho Cet -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-02-09. 
  9. ^ Belle, G. T. (2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20: 51. arXiv:1204.2572Freely accessible. Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2. 

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