Astronomy:1 Ceti
From HandWiki
Short description: Star in the constellation Cetus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 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.
- ↑ 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 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J.
- ↑ 5.0 5.1 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode: 1953GCRV..C......0W.
- ↑ 6.0 6.1 6.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ Pasinetti Fracassini, L. E. et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy & Astrophysics 367 (2): 521–24. doi:10.1051/0004-6361:20000451. Bibcode: 2001A&A...367..521P.
- ↑ "1 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=1+Cet.
- ↑ Darling, David. "Red giant". The Internet Encyclopedia of Science. http://www.daviddarling.info/encyclopedia/R/redgiant.html. 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. Bibcode: 1987PASP...99..713K.
- ↑ Janes, K. A.; McClure, Robert D. (May 1971). "Strong-Cyanogen Stars: Photometry and Kinematics". Astrophysical Journal 165: 561. doi:10.1086/150921. Bibcode: 1971ApJ...165..561J.
 |  |
