1 Ceti

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 put it at a distance of about 535 light-years (164 parsecs) away from the Earth. It is moving further from the Sun with a heliocentric radial velocity of 4 km/s.[5]

1 Ceti
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension  23h 58m 21.22532s[1]
Declination –15° 50′ 50.9421″[1]
Apparent magnitude (V) +6.276[2]
Characteristics
Spectral type K1III CNII[3]
U−B color index +1.03[4]
B−V color index +1.08[4]
Astrometry
Radial velocity (Rv)4.3±2[5] km/s
Proper motion (μ) RA: +82.668[1] mas/yr
Dec.: –7.878[1] mas/yr
Parallax (π)6.0976 ± 0.0711[1] mas
Distance535 ± 6 ly
(164 ± 2 pc)
Absolute magnitude (MV)–0.10[6]
Details
Radius28[7] R☉
Luminosity143.53[6] L☉
Other designations
1 Cet, BD−16°6394, FK5 3925, GC 33242, HD 224481, HIP 118178, HR 9065, SAO 165972[8]
Database references
SIMBADdata

This star 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.[9] The "CNII" in its spectral type indicates strong cyanogen signature in its outer atmosphere.[10][11] The star is radiating 144[6] times the Sun's luminosity from its enlarged photosphere.

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. 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. Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  4. 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". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  6. 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.
  7. Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy & Astrophysics (Third ed.). 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
  8. "1 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 21, 2018.
  9. Darling, David. "Red giant". The Internet Encyclopedia of Science. Retrieved 21 March 2017.
  10. 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.
  11. Janes, K. A.; McClure, Robert D. (May 1971). "Strong-Cyanogen Stars: Photometry and Kinematics". Astrophysical Journal. 165: 561. Bibcode:1971ApJ...165..561J. doi:10.1086/150921.
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