Phi3 Ceti

Phi³ Ceti is a solitary,^[8] orange-hued star in the equatorial constellation of Cetus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.31.^[2] Based upon an annual parallax shift of 6.11 mas as seen from Earth,^[1] it is located approximately 530 light years from the Sun, give or take 20 light years. The star is drifting closer with a radial velocity of −25.5 km/s.^[1]

For other stars with this Bayer designation, see φ Ceti.

Phi³ Ceti

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Cetus
Right ascension	00h 56m 01.48867s[1]
Declination	−11° 15′ 59.4988″[1]
Apparent magnitude (V)	5.31[2]
Characteristics
Spectral type	K5 III[3]
B−V color index	+1.52[2]
Astrometry
Radial velocity (Rv)	−25.48±0.38[1] km/s
Proper motion (μ)	RA: −26.909[1] mas/yr Dec.: −7.174[1] mas/yr
Parallax (π)	6.1068 ± 0.2570 mas[1]
Distance	530 ± 20 ly (164 ± 7 pc)
Absolute magnitude (MV)	−0.78[4]
Details
Mass	1.4[5] M☉
Radius	44.33+0.76 −2.94[1] R☉
Luminosity	441±21[1] L☉
Surface gravity (log g)	1.67[6] cgs
Temperature	3,974+139 −34[1] K
Metallicity [Fe/H]	−0.31[6] dex
Rotational velocity (v sin i)	1.0[5] km/s
Other designations
φ3 Ceti, 22 Cet, BD−12° 162, HD 5437, HIP 4371, HR 267, SAO 147519[7]
Database references
SIMBAD	data

This is an evolved K-type giant star with a stellar classification of K5 III.^[3] It has about 1.4^[5] times the mass and 44^[1] times the radius of the Sun. The star radiates 441 times the solar luminosity from its photosphere at an effective temperature of 3,974 K.^[1]

References

1. 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. Gaia DR2 record for this source at VizieR.
2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
3. Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1999MSS...C05....0H.
4. 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.
5. Melo, C. H. F.; et al. (August 2005), "On the nature of lithium-rich giant stars. Constraints from beryllium abundances", Astronomy and Astrophysics, 439 (1): 227–235, arXiv:astro-ph/0504133, Bibcode:2005A&A...439..227M, doi:10.1051/0004-6361:20041805, S2CID 10580797.
6. Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
7. "phi03 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-04-22.
8. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.