Astronomy:3 Ceti
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 04m 30.11827s[1] |
| Declination | −10° 30′ 34.2849″[1] |
| Apparent magnitude (V) | 4.953[2] |
| Characteristics | |
| Spectral type | K3 III[3] or K3 Ib[4] |
| B−V color index | +1.66[2] |
| Astrometry | |
| Radial velocity (Rv) | −42.10±0.33[5] km/s |
| Proper motion (μ) | RA: −6.85[1] mas/yr Dec.: −12.02[1] mas/yr |
| Parallax (π) | 1.56 ± 0.31[1] mas |
| Distance | approx. 2,100 ly (approx. 600 pc) |
| Details | |
| Mass | 9.0±0.6[6] M☉ |
| Luminosity (bolometric) | 10,170[2] L☉ |
| Surface gravity (log g) | 0.90[7] cgs |
| Temperature | 4,152[7] K |
| Metallicity [Fe/H] | 0.08[7] dex |
| Rotational velocity (v sin i) | 5.8±1.0[8] km/s |
| Age | 29.7±3.6[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
3 Ceti is a single,[10] orange-hued star located around 2,100 light years away in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 4.95.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −42 km/s.[5] It has a peculiar velocity of 60.7+3.8
−6.2 km/s and is a candidate runaway star.[6]
This is a supergiant star with a stellar classification of K3 Ib,[4] although Houk and Swift (1999) classed it as a normal giant at K3 III.[3] It displays microvariability, undergoing changes in brightness with a frequency of 11.2 times per day and an amplitude of 0.0053 in magnitude.[4] The star is about 30 million years old with nine times the mass of the Sun.[6] It is radiating 10,170[2] times the Sun's luminosity from its photosphere at an effective temperature of 4,152 K.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 Hohle, M.M. et al. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten 331 (4): 349. doi:10.1002/asna.200911355. Bibcode: 2010AN....331..349H.
- ↑ 3.0 3.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H.
- ↑ 4.0 4.1 4.2 Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society 331 (1): 45. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 6.2 6.3 Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T
- ↑ 7.0 7.1 7.2 7.3 Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal 147 (6): 137. doi:10.1088/0004-6256/147/6/137. Bibcode: 2014AJ....147..137L.
- ↑ De Medeiros, J. R.; Udry, S.; Burki, G.; Mayor, M. (2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics 395: 97–98. doi:10.1051/0004-6361:20021214. Bibcode: 2002A&A...395...97D.
- ↑ "3 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=3+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.
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