Astronomy:1 Ceti
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Short description: Star in the constellation Cetus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 23h 58m 21.22498s[2] |
| Declination | −15° 50′ 50.9410″[2] |
| Apparent magnitude (V) | +6.276[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K1III CNII[4] |
| U−B color index | +1.03[5] |
| B−V color index | +1.08[5] |
| Astrometry | |
| Radial velocity (Rv) | 4.3±2[6] km/s |
| Proper motion (μ) | RA: +82.986[2] mas/yr Dec.: −7.951[2] mas/yr |
| Parallax (π) | 6.1526 ± 0.0329[2] mas |
| Distance | 530 ± 3 ly (162.5 ± 0.9 pc) |
| Absolute magnitude (MV) | −0.10[1] |
| Details | |
| Mass | 2.4[7] M☉ |
| Radius | 13.9[8] R☉ |
| Luminosity | 83[8] L☉ |
| Surface gravity (log g) | 2.60[7] cgs |
| Temperature | 4,906[7] K |
| Metallicity [Fe/H] | 0.05[7] dex |
| Rotational velocity (v sin i) | 3.1[9] km/s |
| Age | 2.0[10] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
1 Ceti is a star in the constellation of Cetus. With an apparent magnitude of about 6.2,[3] the star is barely visible to the naked eye (see Bortle scale). Parallax estimates put it at a distance of about 530 light-years (162.5 parsecs) away from the Earth. It is moving further from the Sun with a heliocentric radial velocity of 4 km/s.[6]
This star has a spectral type of K1III,[4] 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.[12] The "CNII" in its spectral type indicates strong cyanogen signature in its outer atmosphere.[13][14] The star is radiating 83 times the Sun's luminosity from its enlarged photosphere.[8]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 Houk, N.; Swift, C. (1999). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H.
- ↑ 5.0 5.1 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J.
- ↑ 6.0 6.1 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode: 1953GCRV..C......0W.
- ↑ 7.0 7.1 7.2 7.3 Queiroz, A. B. A.; Anders, F.; Chiappini, C.; Khalatyan, A.; Santiago, B. X.; Nepal, S.; Steinmetz, M.; Gallart, C. et al. (2023). "StarHorse results for spectroscopic surveys and Gaia DR3: Chrono-chemical populations in the solar vicinity, the genuine thick disk, and young alpha-rich stars". Astronomy and Astrophysics 673: A155. doi:10.1051/0004-6361/202245399. Bibcode: 2023A&A...673A.155Q.
- ↑ 8.0 8.1 8.2 Hon, Marc; Huber, Daniel; Kuszlewicz, James S.; Stello, Dennis; Sharma, Sanjib; Tayar, Jamie; Zinn, Joel C.; Vrard, Mathieu et al. (2021). "A "Quick Look" at All-sky Galactic Archeology with TESS: 158,000 Oscillating Red Giants from the MIT Quick-look Pipeline". The Astrophysical Journal 919 (2): 131. doi:10.3847/1538-4357/ac14b1. Bibcode: 2021ApJ...919..131H.
- ↑ Das, Pradosh Barun; Zucker, Daniel B.; De Silva, Gayandhi M.; Borsato, Nicholas W.; Mura-Guzmán, Aldo; Buder, Sven; Ness, Melissa; Nordlander, Thomas et al. (2025). "The GALAH Survey: Stellar parameters and abundances for 800 000 Gaia RVS spectra using GALAH DR4 and the Cannon". Monthly Notices of the Royal Astronomical Society 538 (2): 605. doi:10.1093/mnras/staf169. Bibcode: 2025MNRAS.538..605D.
- ↑ Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K.
- ↑ "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.
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