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 put it at a distance of about 535 light-years (164 parsecs) away from the Earth. It is moving further from the Sun with a heliocentric radial velocity of 4 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 23h 58m 21.22532s[1] |
| Declination | –15° 50′ 50.9421″[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: +82.668[1] mas/yr Dec.: –7.878[1] mas/yr |
| Parallax (π) | 6.0976 ± 0.0711 mas[1] |
| Distance | 535 ± 6 ly (164 ± 2 pc) |
| Absolute magnitude (MV) | –0.10[6] |
| Details | |
| Radius | 28[7] R☉ |
| Luminosity | 143.53[6] L☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
This star 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.[9] The "CNII" in its spectral type indicates strong cyanogen signature in its outer atmosphere.[10][11] The star is radiating 144[6] times the Sun's luminosity from its enlarged photosphere.
References
edit- ^ a b c d e 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.
- ^ 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". Michigan Spectral Survey. 5. 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.
- ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
- ^ 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.
- ^ Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy & Astrophysics. 367 (2) (Third ed.): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
- ^ "1 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 21, 2018.
- ^ Darling, David. "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. Bibcode:1987PASP...99..713K. doi:10.1086/132036.
- ^ Janes, K. A.; McClure, Robert D. (May 1971). "Strong-Cyanogen Stars: Photometry and Kinematics". Astrophysical Journal. 165: 561. Bibcode:1971ApJ...165..561J. doi:10.1086/150921.