Phi4 Ceti
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 58m 43.86730s[1] |
| Declination | −11° 22′ 47.9081″[1] |
| Apparent magnitude (V) | 5.61[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| B−V color index | +0.94[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.24±0.07[4] km/s |
| Proper motion (μ) | RA: −34.21[1] mas/yr Dec.: −14.59[1] mas/yr |
| Parallax (π) | 10.20 ± 0.53[1] mas |
| Distance | 320 ± 20 ly (98 ± 5 pc) |
| Absolute magnitude (MV) | 0.696[5] |
| Details[4] | |
| Mass | 1.76±0.18 M☉ |
| Radius | 10.07±0.62 R☉ |
| Luminosity | 60 L☉ |
| Surface gravity (log g) | 2.60±0.06 cgs |
| Temperature | 4,903±28 K |
| Metallicity [Fe/H] | −0.17±0.03 dex |
| Rotational velocity (v sin i) | 0.83±0.48 km/s |
| Age | 1.52 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Phi4 Ceti is a solitary,[7] orange-hued star in the equatorial constellation Cetus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.61.[2] Based upon an annual parallax shift of 10.20 mas as seen from Earth, it is located roughly 320 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.10 due to interstellar dust.[4]
This is an evolved G-type giant star with a stellar classification of G8 III.[3] It is a red clump star on the horizontal branch, which indicates it is generating energy through helium fusion at its core.[5] The star has about 1.76 times the mass of the Sun and has expanded to ten times the Sun's radius. It is radiating 60 times the solar luminosity from its photosphere at an effective temperature of 4,903 K.[4]
References
- 1 2 3 4 5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357. - 1 2 3 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
- 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 3 4 Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, A50.
- 1 2 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.
- ↑ "phi04 Cet -- Horizontal Branch Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-04-22.
- ↑ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.