1 Ceti

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1 Ceti
Observation data
Epoch J2000        Equinox J2000
Constellation Cetus [1]
Right ascension 23h 58m 21.22532s [2]
Declination −15° 50′ 50.9421″ [2]
Apparent magnitude  (V)+6.276 [3]
Characteristics
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: +82.668 [2] mas/yr
Dec.: −7.878 [2] mas/yr
Parallax (π)6.0976±0.0711  mas [2]
Distance 535 ± 6  ly
(164 ± 2  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
Other designations
1 Cet, BD−16°6394, FK5 3925, GC 33242, HD 224481, HIP 118178, HR 9065, SAO 165972 [10]
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 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. [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. [11] The "CNII" in its spectral type indicates strong cyanogen signature in its outer atmosphere. [12] [13] The star is radiating 144 [1] times the Sun's luminosity from its enlarged photosphere.

References

  1. 1 2 3 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.
  2. 1 2 3 4 5 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 .
  3. 1 2 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. 1 2 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. 1 2 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  6. 1 2 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  7. 1 2 3 4 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.
  8. 1 2 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 .
  9. ↑ 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 .
  10. ↑ "1 Cet". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved December 21, 2018.
  11. ↑ Darling, David. "Red giant". The Internet Encyclopedia of Science. Retrieved 21 March 2017.
  12. ↑ 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 .
  13. ↑ 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.
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