1 Ceti

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1 Ceti
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension 23h 58m 21.22483s[1]
Declination −15° 50′ 50.9427″[1]
Apparent magnitude (V) +6.276[2]
Spectral type K1III CNII[3]
U−B color index +1.03[4]
B−V color index +1.08[4]
Radial velocity (Rv)4.3 ± 2[5] km/s
Proper motion (μ) RA: 83.23[1] mas/yr
Dec.: −8.13[1] mas/yr
Parallax (π)5.24 ± 0.46[1] mas
Distance620 ± 50 ly
(190 ± 20 pc)
Radius28[6] R
Other designations
1 Cet, BD−16° 6394, HD 224481, HIP 118178, HR 9065, SAO 165972[7]
Database references

1 Ceti is a star in the constellation of Cetus. With an apparent magnitude of about 6.2,[2] the star is barely visible to the naked eye (see Bortle scale). Parallax estimates made by the Hipparcos spacecraft put it at a distance of about 620 light years (190 parsecs) away from the Earth.[1]

1 Ceti has a spectral type of K1III,[3] implying a K-type giant. These types of stars are generally reddish-colored stars with spectral types from K to M, with radii that are 10 to 100 times larger than the Sun.[8] The "CNII" in its spectral type indicates a cyanide in its spectrum.[9]


  1. ^ a b c d e f van Leeuwen, F.; et al. (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. ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5: 0. Bibcode:1999MSS...C05....0H.
  4. ^ a b Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  5. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
  6. ^ Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
  7. ^ "* 1 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 March 2017.
  8. ^ David Darling. "Red giant". The Internet Encyclopedia of Science. Retrieved 21 March 2017.
  9. ^ Keenan, Philip C. (1987). "Spectral types and their uses". Publications of the Astronomical Society of the Pacific. 99: 713. Bibcode:1987PASP...99..713K. doi:10.1086/132036.