56 Ceti

56 Ceti is a single[7] star located in the equatorial constellation of Cetus. Not found in the original Bayer catalogue, it was given the Bayer-like designation Upsilon1 Ceti by Flamsteed[8] to distinguish it from Bayer's Upsilon Ceti, which Flamsteed designated Upsilon2 or 59 Ceti. In 1801, J. E. Bode included this designation in his Uranographia,[9] but the superscripted designations Upsilon1 and Upsilon2 are not in general use today. 56 Ceti is the Flamsteed designation for this star.

56 Ceti
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension 01h 56m 40.20314s[1]
Declination −22° 31′ 36.4091″[1]
Apparent magnitude (V) 4.85[2]
Characteristics
Spectral type K3III[3]
U−B color index +1.67[4]
B−V color index +1.434±0.005[5]
Astrometry
Radial velocity (Rv)+27.38±0.80[1] km/s
Proper motion (μ) RA: +59.881[1] mas/yr
Dec.: −25.633[1] mas/yr
Parallax (π)7.3878 ± 0.1861[1] mas
Distance440 ± 10 ly
(135 ± 3 pc)
Absolute magnitude (MV)−0.25[5]
Details
Radius39.20+1.15
−2.93[1] R☉
Luminosity391+11
−20[1] L☉
Surface gravity (log g)1.85[2] cgs
Temperature4,099+163
−59[1] K
Metallicity [Fe/H]−0.18[2] dex
Other designations
56 Cet, CD−23°721, GC 2343, HD 11930, HIP 9061, HR 565, SAO 167416[6]
Database references
SIMBADdata

This star is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.85.[2] It is located about 440 light years from the Sun, based on parallax, and is drifting further away with a radial velocity of +27 km/s.[1] 56 Ceti is an aging giant star with a stellar classification of K3III,[3] having exhausted the supply of hydrogen at its core and expanded to 39[1] times the Sun's radius. It is radiating 391[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,099 K.[1]

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. Gaia DR2 record for this source at VizieR.
  2. McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". Astrophysical Journal Supplement Series. 74: 1075–1128. Bibcode:1990ApJS...74.1075M. doi:10.1086/191527.
  3. Houk, N.; Smith-Moore, M. (1988). Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Declinations -26°.0 to -12°.0. 4. Bibcode:1988mcts.book.....H.
  4. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  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. "56 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-01.
  7. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  8. See 56 Ceti in Lalande's recension of Flamsteed's catalog: Lalande, Jérôme (1783). Éphémérides des mouvemens célestes. p. 153.
  9. "Pressefotos zu "Die Ordnung des Himmels. Planetengötter – Sternatlanten"". Retrieved 2019-08-02.

Notes
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