46 Ceti
Observation data Epoch J2000 Equinox J2000 | |
---|---|
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[]
- ^ a b c d e f 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.
- ^ a b 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.
- ^ a b c 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.
- ^ a b 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.
- ^ a b c d e f g h 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.
- ^ a b c d e f 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.
- K-type giants
- Cetus (constellation)
- Durchmusterung objects
- Flamsteed objects
- Henry Draper Catalogue objects
- Hipparcos objects
- HR objects