Astronomy:Phi4 Ceti
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 58m 43.86805s[1] |
| Declination | −11° 22′ 47.9107″[1] |
| Apparent magnitude (V) | 5.61[2] |
| Characteristics | |
| Evolutionary stage | Horizontal branch[3] |
| Spectral type | G8 III[4] |
| B−V color index | +0.94[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.32±0.13[1] km/s |
| Proper motion (μ) | RA: −32.898[1] mas/yr Dec.: −14.466[1] mas/yr |
| Parallax (π) | 9.7501 ± 0.0666[1] mas |
| Distance | 335 ± 2 ly (102.6 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.696[3] |
| Details | |
| Mass | 1.53±0.04[5] M☉ |
| Radius | 10.972±0.224[6] R☉ |
| Luminosity | 63.2±1.3[6] L☉ |
| Surface gravity (log g) | 2.60±0.06[6] cgs |
| Temperature | 4,914±50[6] K |
| Metallicity [Fe/H] | −0.17±0.03[7] dex |
| Rotational velocity (v sin i) | 0.83±0.48[7] km/s |
| Age | 2.20±0.04[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Phi4 Ceti is a solitary,[9] 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 9.75 mas as seen from Earth,[1] it is located approximately 335 light-years (103 pc) 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,[7] giving it an absolute magnitude of 0.70.[3] It is drifting closer with a radial velocity of −19 km/s.[7]
This is an evolved G-type giant star with a stellar classification of G8 III.[4] At the estimated age of 2.2 billion years,[5] is a red clump giant on the horizontal branch, which indicates it is generating energy through helium fusion at its core.[3] The star has 1.53 times the mass of the Sun[5] and has expanded to 11 times the Sun's radius. It is radiating 63 times the solar luminosity from its photosphere at an effective temperature of 4,914 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 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.
- ↑ 3.0 3.1 3.2 3.3 Liu, Y. J. et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society 382 (2): 553–66, doi:10.1111/j.1365-2966.2007.11852.x, Bibcode: 2007MNRAS.382..553L.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 5.2 5.3 Gallenne, A. et al. (August 2018), "Fundamental properties of red-clump stars from long-baseline H-band interferometry" (in en), Astronomy & Astrophysics 616: A68, doi:10.1051/0004-6361/201833341, ISSN 0004-6361, Bibcode: 2018A&A...616A..68G
- ↑ 6.0 6.1 6.2 6.3 6.4 Soubiran, C. et al. (February 2024), "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version", Astronomy and Astrophysics 682: A145, doi:10.1051/0004-6361/202347136, ISSN 0004-6361, Bibcode: 2024A&A...682A.145S Phi4 Ceti's database entry at VizieR.
- ↑ 7.0 7.1 7.2 7.3 Jofré, E. et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics 574: A50, doi:10.1051/0004-6361/201424474, A50, Bibcode: 2015A&A...574A..50J.
- ↑ "phi04 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=phi04+Cet.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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