1 Ceti
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 23h 58m 21.22483s[1] |
| Declination | −15° 50′ 50.9427″[1] |
| Apparent magnitude (V) | +6.276[2] |
| Characteristics | |
| Spectral type | K1III CNII[3] |
| U−B color index | +1.03[4] |
| B−V color index | +1.08[4] |
| Astrometry | |
| Radial velocity (Rv) | 4.3 ± 2[5] km/s |
| Proper motion (μ) | RA: 83.23[1] mas/yr Dec.: −8.13[1] mas/yr |
| Parallax (π) | 5.24 ± 0.46 mas[1] |
| Distance | 620 ± 50 ly (190 ± 20 pc) |
| Details | |
| Radius | 28[6] R☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
1 Ceti is a star in the constellation of Cetus. With an apparent magnitude of about 6.2,[2] the star is barely visible to the naked eye (see Bortle scale). Parallax estimates made by the Hipparcos spacecraft put it at a distance of about 620 light years (190 parsecs) away from the Earth.[1]
1 Ceti has a spectral type of K1III,[3] implying a K-type giant. These types of stars are generally reddish-colored stars with spectral types from K to M, with radii that are 10 to 100 times larger than the Sun.[8] The "CNII" in its spectral type indicates a cyanide in its spectrum.[9]
References
- ^ a b c d e f van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Archived from the original on 2016-04-02.
{{cite journal}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ a b 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.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5: 0. Bibcode:1999MSS...C05....0H.
- ^ a b Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
- ^ Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
- ^ "* 1 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 March 2017.
- ^ David Darling. "Red giant". The Internet Encyclopedia of Science. Retrieved 21 March 2017.
- ^ Keenan, Philip C. (1987). "Spectral types and their uses". Publications of the Astronomical Society of the Pacific. 99: 713. doi:10.1086/132036.
 | This giant-star-related article is a stub. You can help Wikipedia by expanding it. |