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.
| 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 mas[1] |
| Distance | 440 ± 10 ly (135 ± 3 pc) |
| Absolute magnitude (MV) | −0.25[5] |
| Details | |
| Radius | 39.20+1.15 −2.93[1] R☉ |
| Luminosity | 391+11 −20[1] L☉ |
| Surface gravity (log g) | 1.85[2] cgs |
| Temperature | 4,099+163 −59[1] K |
| Metallicity [Fe/H] | −0.18[2] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
edit- ^ a b c d e f g h i j k l m 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.
- ^ a b c d 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.
- ^ a b Houk, N.; Smith-Moore, M. (1988). Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Declinations -26°.0 to -12°.0. Vol. 4. Bibcode:1988mcts.book.....H.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ 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. S2CID 119257644.
- ^ "56 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-01.
- ^ 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. S2CID 14878976.
- ^ See 56 Ceti in Lalande's recension of Flamsteed's catalog: Lalande, Jérôme (1783). Éphémérides des mouvemens célestes. p. 153.
- ^ "Pressefotos zu "Die Ordnung des Himmels. Planetengötter – Sternatlanten"". Retrieved 2019-08-02.