Astronomy:46 Ceti
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 01h 25m 37.23270s[1] |
| Declination | −14° 35′ 55.6414″[1] |
| Apparent magnitude (V) | 4.907[2] |
| Characteristics | |
| Spectral type | K2+ III–IIIb CN0.5[3] |
| U−B color index | +1.26[4] |
| B−V color index | +1.231±0.009[5] |
| Astrometry | |
| Radial velocity (Rv) | −22.6±0.7[6] km/s |
| Proper motion (μ) | RA: +44.670[1] mas/yr Dec.: −17.216[1] mas/yr |
| Parallax (π) | 11.9466 ± 0.3140[1] mas |
| Distance | 273 ± 7 ly (84 ± 2 pc) |
| Absolute magnitude (MV) | +0.19[5] |
| Details | |
| Mass | 1.38[7] M☉ |
| Radius | 19[8] R☉ |
| Luminosity | 132[7] L☉ |
| Surface gravity (log g) | 2.2[8] cgs |
| Temperature | 4,316±89[7] K |
| Metallicity [Fe/H] | –0.32[8] dex |
| Rotational velocity (v sin i) | 0.0[8] km/s |
| Age | 4.17[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
46 Ceti is a single[10] star in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 4.9.[11] The distance to this star, as determined from an annual parallax shift of 11.9 mas,[1] is about 273 light years. It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s,[6] and is expected to come as close as 184 light-years in 2.2 million years.[5]
At the age of about four billion years,[7] this is an evolved K-type giant star with a stellar classification of K2+ III–IIIb CN0.5.[3] The suffix notation CN0.5 indicates a mild overabundance of cyanogen in the stellar atmosphere. It has 1.38[7] times the mass of the Sun and has expanded to 19[8] times the Sun's radius. The star is radiating 132[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,316 K.[7] The projected rotational velocity is too small to be measured.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ Høg, E. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. doi:10.1888/0333750888/2862. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 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 5.2 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 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. Bibcode: 2015AJ....150...88L.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal 135 (1): 209–231. doi:10.1088/0004-6256/135/1/209. Bibcode: 2008AJ....135..209M.
- ↑ "46 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=46+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.
- ↑ Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H.
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