1 Ceti
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[2] |
| 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 | |
| 1 Cet, BD−16°6394, FK5 3925, GC 33242, HD 224481, HIP 118178, HR 9065, SAO 165972[11] | |
| 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
- ^ a b 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. XHIP record for this object at VizieR.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ 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 d Queiroz, A. B. A.; Anders, F.; Chiappini, C.; Khalatyan, A.; Santiago, B. X.; Nepal, S.; Steinmetz, M.; Gallart, C.; Valentini, M.; Dal Ponte, M.; Barbuy, B.; Pérez-Villegas, A.; Masseron, T.; Fernández-Trincado, J. G.; Khoperskov, S.; Minchev, I.; Fernández-Alvar, E.; Lane, R. R.; Nitschelm, C. (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. arXiv:2303.09926. Bibcode:2023A&A...673A.155Q. doi:10.1051/0004-6361/202245399.
- ^ a b c Hon, Marc; Huber, Daniel; Kuszlewicz, James S.; Stello, Dennis; Sharma, Sanjib; Tayar, Jamie; Zinn, Joel C.; Vrard, Mathieu; Pinsonneault, Marc H. (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. arXiv:2108.01241. Bibcode:2021ApJ...919..131H. doi:10.3847/1538-4357/ac14b1.
- ^ Das, Pradosh Barun; Zucker, Daniel B.; De Silva, Gayandhi M.; Borsato, Nicholas W.; Mura-Guzmán, Aldo; Buder, Sven; Ness, Melissa; Nordlander, Thomas; Casey, Andrew R.; Martell, Sarah L.; Bland-Hawthorn, Joss; De Grijs, Richard; Freeman, Ken C.; Kos, Janez; Stello, Dennis; Lewis, Geraint F.; Hayden, Michael R.; Sharma, Sanjib (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. arXiv:2410.12272. Bibcode:2025MNRAS.538..605D. doi:10.1093/mnras/staf169.
- ^ Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A.; Andrae, R.; Poggio, E.; Spitoni, E.; Contursi, G.; Zhao, H.; Oreshina-Slezak, I.; Ordenovic, C.; Bijaoui, A. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics. 669: A104. arXiv:2206.07937. Bibcode:2023A&A...669A.104K. doi:10.1051/0004-6361/202244283.
- ^ "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.