Astronomy:Phi1 Cancri
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Short description: Star in the constellation Cancer
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 26m 27.70615s[1] |
| Declination | +27° 53′ 36.8867″[1] |
| Apparent magnitude (V) | +5.57[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +1.68[2] |
| B−V color index | +1.40[2] |
| Astrometry | |
| Radial velocity (Rv) | +25.25±0.19[4] km/s |
| Proper motion (μ) | RA: −33.28[1] mas/yr Dec.: −116.17[1] mas/yr |
| Parallax (π) | 8.74 ± 0.40[1] mas |
| Distance | 370 ± 20 ly (114 ± 5 pc) |
| Absolute magnitude (MV) | +0.29[5] |
| Details | |
| Radius | 17[6] R☉ |
| Luminosity | 121[7] L☉ |
| Temperature | 4,138[7] 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, Latinised from φ1 Cancri, is a solitary,[3] orange-hued star in the constellation Cancer. It is faintly visible to the naked eye with an apparent visual magnitude of +5.57.[2] Based upon an annual parallax shift of 8.74 mas,[1] it is approximately 370 light-years from the Sun.
This is an evolved K-type giant star with a stellar classification of K5 III.[3] 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 17 times the radius of the Sun.[6] It is radiating 121 times the Sun's luminosity from its photosphere at an effective temperature of 4,138 K.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 3.2 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.
- ↑ 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.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 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:
- [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(84.5\cdot 1.87\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 34\cdot R_{\bigodot} \end{align} }[/math]
- ↑ 7.0 7.1 7.2 Cousins, A. W. J. et al. (1966), "Photoelectric magnitudes and colours of southern stars, II", Royal Observatory Bulletins 121: 1, Bibcode: 1966RGOB..121....1C.
- ↑ 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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