Rho Ceti

Rho Ceti
Location of ρ Ceti (circled in red)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cetus[1]
Right ascension 02h 25m 57.006s[2]
Declination −12° 17′ 25.708″[2]
Apparent magnitude (V) 4.885[3]
Characteristics
Evolutionary stage subgiant[4]
Spectral type A0 V[5]
U−B color index +0.001[3]
B−V color index −0.037[3]
Astrometry
Radial velocity (Rv)+18.9±2.0[6] km/s
Proper motion (μ) RA: −11.596 mas/yr[2]
Dec.: −9.786 mas/yr[2]
Parallax (π)5.8054±0.1358 mas[2]
Distance560 ± 10 ly
(172 ± 4 pc)
Absolute magnitude (MV)−0.85[1]
Details
Mass2.3[7] M☉
Radius6.3[8] R☉
Luminosity328[9] L☉
Surface gravity (log g)3.56[10] cgs
Temperature9,505[10] K
Rotational velocity (v sin i)219[11] km/s
Age72[7] Myr
Other designations
ρ Cet, 72 Cet, BD−12°451, FK5 1066, HD 15130, HIP 11345, HR 708, SAO 148385[12]
Database references
SIMBADdata

Rho Ceti is a star in the equatorial constellation of Cetus. Its name is a Bayer designation that is Latinized from ρ Ceti, and abbreviated Rho Cet or ρ Cet. This star is faintly visible to the naked eye with an apparent visual magnitude of 4.885.[3] The distance to this star, based upon an annual parallax shift of 5.81 mas,[2] is around 560 light years. It is drifting further away with a line of sight velocity component of +19 km/s.[6]

This star has a stellar classification of A0 V,[5] which is presenting as an A-type main sequence star. However, it may be in the subgiant stage of its evolution.[4] It is spinning rapidly with a projected rotational velocity of 219[11] km/s, giving the star an oblate shape with an equatorial bulge that is 10% larger than the polar radius.[13] The star has an estimated size 6.3 times the radius of the Sun[8] and is radiating 328 times the solar luminosity[9] from its outer atmosphere at an effective temperature of 9,505 K.[10]

Name

This star, along with π Cet, ε Cet and σ Cet, was Al Sufi's Al Sadr al Ḳaiṭos, the Whale's Breast.[14]

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.[15]

In Chinese, 芻蒿 (Chú Hāo), meaning Hay, refers to an asterism consisting of ρ Ceti, 77 Ceti, 67 Ceti, 71 Ceti, HD 14691[16] 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.[17]

References

  1. ^ a b 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 XHIP record for this object at VizieR.
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ 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.
  4. ^ a b Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  5. ^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  6. ^ a b 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.
  7. ^ a b Gullikson, Kevin; et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40.
  8. ^ a b Stassun, Keivan G.; et al. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal, 158 (4): 138, arXiv:1905.10694, Bibcode:2019AJ....158..138S, doi:10.3847/1538-3881/ab3467.
  9. ^ a b Fetherolf, Tara; et al. (2023), "Variability Catalog of Stars Observed during the TESS Prime Mission", The Astrophysical Journal Supplement Series, 268 (1): 4, arXiv:2208.11721, Bibcode:2023ApJS..268....4F, doi:10.3847/1538-4365/acdee5.
  10. ^ a b c Cardiel, Nicolás; et al. (2021), "Synthetic RGB photometry of bright stars: Definition of the standard photometric system and UCM library of spectrophotometric spectra", Monthly Notices of the Royal Astronomical Society, 504 (3): 3730, arXiv:2103.17009, Bibcode:2021MNRAS.504.3730C, doi:10.1093/mnras/stab997.
  11. ^ 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.
  12. ^ "rho Cet", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-02-09
  13. ^ 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.
  14. ^ 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.{{citation}}: CS1 maint: ignored ISBN errors (link)
  15. ^ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology.
  16. ^ (in Chinese) 夢之大地 @ 國立成功大學 WebBBS DreamLand @ National Cheng Kung University WebBBS System
  17. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 12 日 Archived 2011-05-22 at the Wayback Machine
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