Astronomy:Phi1 Cancri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | 08h 26m 27.706s[2] |
| Declination | +27° 53′ 36.89″[2] |
| Apparent magnitude (V) | +5.57[3] |
| Characteristics | |
| Spectral type | K5 III[4] |
| U−B color index | +1.68[3] |
| B−V color index | +1.40[3] |
| Astrometry | |
| Radial velocity (Rv) | +25.25±0.19[5] km/s |
| Proper motion (μ) | RA: −33.427[2] mas/yr Dec.: −115.457[2] mas/yr |
| Parallax (π) | 7.5571 ± 0.0757[2] mas |
| Distance | 432 ± 4 ly (132 ± 1 pc) |
| Absolute magnitude (MV) | +0.29[1] |
| Details | |
| Mass | 1.27+1.21−0.45[6] M☉ |
| Radius | 27[7] R☉ |
| Luminosity | 195+14−13[6] L☉ |
| Temperature | 4,100±80[6] K |
| Metallicity [Fe/H] | −0.134±0.093[8] dex |
| Rotational velocity (v sin i) | 1.3[9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Phi1 Cancri is a solitary,[4] orange-hued star in the constellation Cancer. Its name is a Bayer designation that is Latinized from φ1 Cancri, and abbreviated Phi1 Cnc or φ1 Cnc. This star is faintly visible to the naked eye with an apparent visual magnitude of +5.57.[3] Based upon an annual parallax shift of 7.56 mas,[2] it is approximately 432 light-years (132 pc) distant from the Sun. The star is drifting further away with a line of sight velocity of +25 km/s.[5]
This is an evolved K-type giant star with a stellar classification of K5 III,[4] having exhausted the hydrogen at its core then expanded off from the main sequence. The measured angular diameter of this star, after correction for limb darkening, is 1.87±0.02 mas.[11] At the estimated distance of Phi1 Cancri, this yields a physical size of about 27 times the radius of the Sun.[7] It has 1.3 times the mass of the Sun and is radiating 195 times the Sun's luminosity from its photosphere at an effective temperature of 4,100 K.[6]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 3.3 Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues 2237, Bibcode: 2002yCat.2237....0D.
- ↑ 4.0 4.1 4.2 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.
- ↑ 5.0 5.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 6.3 Charbonnel, C. et al. (January 2020), "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era", Astronomy and Astrophysics 633: A34, doi:10.1051/0004-6361/201936360, ISSN 0004-6361, Bibcode: 2020A&A...633A..34C.
- ↑ 7.0 7.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R*) is given by:
- ↑ Taylor, B. J. (February 1999), "Catalogs of temperatures and [Fe/H] averages for evolved G and K stars", Astronomy and Astrophysics Supplement 134 (3): 523–524, doi:10.1051/aas:1999153, Bibcode: 1999A&AS..134..523T.
- ↑ De Medeiros, J. R. et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics 363: 239–243, Bibcode: 2000A&A...363..239D.
- ↑ "phi01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=phi01+Cnc.
- ↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R.
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