Phi2 Ceti

Phi2 Ceti (φ2 Ceti), is a star located in the equatorial constellation of Cetus. φ2 Ceti is also known as 19 Cet, and HD 4813. Based upon parallax measurements, it is located about 51 light years away. It has an apparent visual magnitude of +5.19, making it bright enough to be seen with the naked eye.

For other stars with this Bayer designation, see φ Ceti.
φ2 Ceti
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension  00h 50m 07.58963s[1]
Declination −10° 38′ 39.5835″[1]
Apparent magnitude (V) 5.172[2]
Characteristics
Spectral type F7V[3]
U−B color index +0.009[2]
B−V color index +0.518[2]
Astrometry
Radial velocity (Rv)+7.7[4] km/s
Proper motion (μ) RA: –226.91[1] mas/yr
Dec.: –229.75[1] mas/yr
Parallax (π)63.48 ± 0.35[1] mas
Distance51.4 ± 0.3 ly
(15.75 ± 0.09 pc)
Absolute magnitude (MV)4.23[5]
Details
Mass1.19[6] M☉
Surface gravity (log g)4.45[6] cgs
Temperature6,352[6] K
Metallicity [Fe/H]−0.03[6] dex
Rotational velocity (v sin i)4.3[7] km/s
Age1.9[6] Gyr
Other designations
φ2 Cet, 19 Cet, HR 235, GJ 37, HD 4813, HIP 3909, SAO 147470, BD-11 153
Database references
SIMBADdata

This is an F-type main sequence star with a stellar classification of F7V and an effective temperature of 6,352 Kelvin. It has a mass of 1.1 solar masses. It is an irregular variable.

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Gutierrez-Moreno, Adelina; et al. (1966), A System of photometric standards, 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode:1966PDAUC...1....1G.
  3. Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–70, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  4. Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
  5. Paunzen, E.; et al. (July 2014), "Investigating the possible connection between λ Bootis stars and intermediate Population II type stars", Astronomy & Astrophysics, 567: 8, arXiv:1406.3936, Bibcode:2014A&A...567A..67P, doi:10.1051/0004-6361/201423817, A67.
  6. Bensby, T.; et al. (2014), "Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the solar neighbourhood", Astronomy & Astrophysics, 562 (A71): 28, arXiv:1309.2631, Bibcode:2014A&A...562A..71B, doi:10.1051/0004-6361/201322631.
  7. Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.


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