Phi1 Ceti
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Cetus |
Right ascension | 00h 44m 11.40013s[1] |
Declination | −10° 36′ 34.3816″[1] |
Apparent magnitude (V) | 4.75[2] |
Characteristics | |
Spectral type | K0 III[3] |
U−B color index | +0.83[2] |
B−V color index | +1.00[2] |
Astrometry | |
Radial velocity (Rv) | ±0.63 +0.33[4] km/s |
Proper motion (μ) | RA: −8.96[1] mas/yr Dec.: −113.82[1] mas/yr |
Parallax (π) | 13.96 ± 0.24[1] mas |
Distance | 234 ± 4 ly (72 ± 1 pc) |
Absolute magnitude (MV) | 0.732[5] |
Details[4] | |
Mass | 1.60[6] M☉ |
Radius | 11 R☉ |
Luminosity | 54 L☉ |
Surface gravity (log g) | 2.7 cgs |
Temperature | ±5 4,775 K |
Metallicity [Fe/H] | −0.16 dex |
Rotational velocity (v sin i) | 2.3 km/s |
Age | 2.21[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Phi1 Ceti is a star located in the equatorial constellation Cetus. It is visible to the naked eye with an apparent visual magnitude of +4.78. Based upon an annual parallax shift of 13.96 mas,[1] it is located about 234 light years from the Sun.
At an age of about 2.21[6] billion years, this is an evolved red clump[8] giant star with a stellar classification of K0 III.[3] It is presently on the horizontal branch and is generating energy through the nuclear fusion of helium at its core. The star is suspected of variability; it has been measured to vary between magnitudes 4.75 and 4.78.[9]
Based upon the motion of this star through space, Phi1 Ceti is a probable member of the proposed Wolf 630 moving group. This is a set of stars centered on Wolf 630 that are moving nearly in parallel and have an age of around ±0.5 billion years. They may be former members of a dissolved 2.7open cluster.[10]
References
- 1 2 3 4 5 6 van Leeuwen, F. (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.
- 1 2 3 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
- 1 2 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, 5, Bibcode:1999MSS...C05....0H.
- 1 2 Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
- ↑ Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
- 1 2 3 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
- ↑ "phi01 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-04-25.
- ↑ Puzeras, E.; et al. (October 2010), "High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements", Monthly Notices of the Royal Astronomical Society, 408 (2): 1225–1232, arXiv:1006.3857, Bibcode:2010MNRAS.408.1225P, doi:10.1111/j.1365-2966.2010.17195.x.
- ↑ VSX (January 18, 2010), "NSV 278", AAVSO Website, American Association of Variable Star Observers, retrieved 2017-04-25.
- ↑ Bubar, Eric J.; King, Jeremy R. (August 2010), "Spectroscopic Abundances and Membership in the Wolf 630 Moving Group", The Astronomical Journal, 140 (2): 293–318, arXiv:1005.1205, Bibcode:2010AJ....140..293B, doi:10.1088/0004-6256/140/2/293.