| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 01 25 37.23270 |
| Declination | −14° 35′ 55.6414″ |
| Apparent magnitude (V) | 4.907 |
| Characteristics | |
| Spectral type | K2+ III–IIIb CN0.5 |
| U−B color index | +1.26 |
| B−V color index | +1.231±0.009 |
| Astrometry | |
| Radial velocity (Rv) | −22.6±0.7 km/s |
| Proper motion (μ) | RA: +44.670 mas/yr Dec.: −17.216 mas/yr |
| Parallax (π) | 11.9466 ± 0.3140 mas |
| Distance | 273 ± 7 ly (84 ± 2 pc) |
| Absolute magnitude (MV) | +0.19 |
| Details | |
| Mass | 1.38 M☉ |
| Radius | 19 R☉ |
| Luminosity | 132 L☉ |
| Surface gravity (log g) | 2.2 cgs |
| Temperature | 4,316±89 K |
| Metallicity | –0.32 dex |
| Rotational velocity (v sin i) | 0.0 km/s |
| Age | 4.17 Gyr |
| Other designations | |
| BD−15°266, HD 8705, HIP 6670, HR 412, SAO 147803 | |
| Database references | |
| SIMBAD | data |
46 Ceti is a single star in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 4.9. The distance to this star, as determined from an annual parallax shift of 11.9 mas, is about 273 light years. It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s, and is expected to come as close as 184 light-years in 2.2 million years.
At the age of about four billion years, this is an evolved K-type giant star with a stellar classification of K2+ III–IIIb CN0.5. The suffix notation CN0.5 indicates a mild overabundance of cyanogen in the stellar atmosphere. It has 1.38 times the mass of the Sun and has expanded to 19 times the Sun's radius. The star is radiating 132 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,316 K. The projected rotational velocity is too small to be measured.
References
- ^ 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.
- Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
- ^ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
- Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ 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.
- ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
- ^ 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. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
- "46 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 27, 2018.
- 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.
- Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H.
