Astronomy:56 Ceti
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 01h 56m 40.20252s[1] |
| Declination | −22° 31′ 36.4249″[1] |
| Apparent magnitude (V) | 4.85[2] |
| Characteristics | |
| Evolutionary stage | red giant branch[1] |
| Spectral type | K3III[3] |
| U−B color index | +1.67[4] |
| B−V color index | +1.434±0.005[5] |
| Astrometry | |
| Radial velocity (Rv) | +27.21±0.18[1] km/s |
| Proper motion (μ) | RA: +60.374[1] mas/yr Dec.: −24.635[1] mas/yr |
| Parallax (π) | 7.3290 ± 0.1264[1] mas |
| Distance | 445 ± 8 ly (136 ± 2 pc) |
| Absolute magnitude (MV) | −0.25[5] |
| Details | |
| Mass | 1.27[6] M☉ |
| Radius | 35.0[7] R☉ |
| Luminosity | 453[1] L☉ |
| Surface gravity (log g) | 1.88[6] cgs |
| Temperature | 4,218[7] K |
| Metallicity [Fe/H] | −0.18[6] dex |
| Rotational velocity (v sin i) | 1.3[8] km/s |
| Age | 2.9[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
56 Ceti is a single[11] 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[12] 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,[13] 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 445 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 35 times the Sun's radius.[7] It is radiating 453 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,217 K.[7]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 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. doi:10.1086/191527. Bibcode: 1990ApJS...74.1075M.
- ↑ 3.0 3.1 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.
- ↑ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K.
- ↑ 7.0 7.1 7.2 7.3 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.
- ↑ Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K.
- ↑ "56 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=56+Cet.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ See 56 Ceti in Lalande's recension of Flamsteed's catalog: Lalande, Jérôme (1783). Éphémérides des mouvemens célestes. p. 153. https://books.google.com/books?id=pZAAAAAAMAAJ&pg=PR153.
- ↑ "Pressefotos zu "Die Ordnung des Himmels. Planetengötter – Sternatlanten"". https://www.hlmd.de/en/press/latest-press-releases-and-images/detail/news/pressefotos-zu-die-ordnung-des-himmels-planetengoetter-sternatlanten.html.
 |  |
