Phi1 Cancri

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Phi1 Cancri
Observation data
Epoch J2000.0      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]
Spectral type K5 III[3]
U−B color index +1.68[2]
B−V color index +1.40[2]
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
Distance370 ± 20 ly
(114 ± 5 pc)
Absolute magnitude (MV)+0.29[5]
Radius17[6] R
Luminosity121[7] L
Temperature4,138[7] K
Metallicity [Fe/H]−0.134±0.093[8] dex
Rotational velocity (v sin i)1.3[9] km/s
Other designations
φ1 Cnc, 22 Cancri, BD+28° 1602, FK5 2656, HD 71093, HIP 41377, HR 3304, SAO 80181[10]
Database references

Phi1 Cancri, Latinized 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]


  1. ^ a b c d e f 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.
  2. ^ a b c d 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. ^ a b c 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  4. ^ 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  6. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  7. ^ a b c Cousins, A. W. J.; et al. (1966), "Photoelectric magnitudes and colours of southern stars, II", Royal Observatory bulletins, 121, Bibcode:1966RGOB..121....1C.
  8. ^ Taylor, B. J. (February 1999), "Catalogs of temperatures and [Fe/H] averages for evolved G and K stars", Astronomy and Astrophysics Supplement, 134: 523–524, Bibcode:1999A&AS..134..523T, doi:10.1051/aas:1999153.
  9. ^ De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
  10. ^ "phi01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-09.
  11. ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.