Rho2 Cancri

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Rho2 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 08h 55m 39.68055s[1]
Declination +27° 55′ 38.9299″[1]
Apparent magnitude (V) 5.22[2]
Spectral type G8 III[3] or G8 II-III[4]
U−B color index +0.78[2]
B−V color index +1.00[2]
Radial velocity (Rv) +16.3±0.3[5] km/s
Proper motion (μ) RA: −12.24[1] mas/yr
Dec.: −33.79[1] mas/yr
Parallax (π) 6.70 ± 0.32[1] mas
Distance 490 ± 20 ly
(149 ± 7 pc)
Absolute magnitude (MV) −1.13[3]
Mass 3.59[6] M
Radius 24.2[3] R
Luminosity 310[3] L
Surface gravity (log g) 2.46[7] cgs
Temperature 4,994[7] K
Metallicity [Fe/H] 0.11[7] dex
Rotational velocity (v sin i) 8.1[3] km/s
Age 234[6] Myr
Other designations
ρ2 Cnc Cnc, 58 Cancri, BD+28° 1666, FK5 2705, HD 76219, HIP 43834, HR 3540, SAO 80511[8]
Database references

Rho2 Cancri2 Cancri) is a solitary,[4] yellow-hued star in the constellation Cancer. With an apparent visual magnitude of 5.22,[2] it is visible to the naked eye on a dark night. Based upon an annual parallax shift of 6.70 mas as seen from Earth,[1] this star is located around 490 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.06 due to interstellar dust.[6]

At the age of about 234[6] million years, is an evolved, G-type giant star with a stellar classification of G8 III.[3] It has an estimated 3.6[6] times the mass of the Sun and has expanded to 24[3] times the Sun's radius. It is radiating 310[3] times the Sun's luminosity from its photosphere at an effective temperature of 4,994 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:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7–22, Bibcode:1983ApJS...52....7F, doi:10.1086/190856. 
  3. ^ a b c d e f g h Henry, Gregory W.; et al. (September 2000), "Photometric Variability in a Sample of 187 G and K Giants", The Astrophysical Journal Supplement Series, 130 (1): 201–225, Bibcode:2000ApJS..130..201H, doi:10.1086/317346 
  4. ^ a b 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  5. ^ 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:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  6. ^ a b c d e Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434Freely accessible, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781. 
  7. ^ a b c d Luck, R. Earle (2014), "Parameters and Abundances in Luminous Stars", The Astronomical Journal, 147 (6): 137, Bibcode:2014AJ....147..137L, doi:10.1088/0004-6256/147/6/137. 
  8. ^ "rho02 Cnc -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-13.