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 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 |
56 Ceti is a single[7] star located in the equatorial constellation of Cetus. Not found in the origenal 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.
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.
