Mu2 Cancri

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Mu2 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 08h 07m 45.85574s[1]
Declination +21° 34′ 54.5441″[1]
Apparent magnitude (V) +5.30[2]
Spectral type G2 IV[3]
U−B color index +0.21[2]
B−V color index +0.63[2]
Radial velocity (Rv) −36.0±0.1[4] km/s
Proper motion (μ) RA: +23.00[1] mas/yr
Dec.: −66.42[1] mas/yr
Parallax (π) 42.94 ± 0.30[1] mas
Distance 76.0 ± 0.5 ly
(23.3 ± 0.2 pc)
Absolute magnitude (MV) +3.46[5]
Mass 1.192+0.017
[6] M
Radius 1.82[7] R
Luminosity 3.45[8] L
Surface gravity (log g) 3.97±0.02[6] cgs
Temperature 5,809±59[6] K
Metallicity [Fe/H] 0.11[6] dex
Rotational velocity (v sin i) 3.7±0.3[5] km/s
Age 5.64+0.35
[6] Gyr
Other designations
μ Cnc, 10 Cancri, BD+22° 1862, FK5 2630, HD 67228, HIP 39780, HR 3176, SAO 79959[9]
Database references

Mu2 Cancri is a solitary,[10] yellow-hued star in the zodiac constellation of Cancer. It is visible to the naked eye with an apparent visual magnitude of +5.30.[2] Based upon an annual parallax shift of 42.94 mas as seen from Earth,[1] this star is located around 76.0 light years from the Sun. Mu2 Cancri will make its closest approach in about 600,000 years when it passes at a distance of 4.9 pc (16 ly).[11]

At the estimated age of 5.6 billion years, it is an evolving G-type subgiant star with a stellar classification of G2 IV.[3] It has 1.2[6] times the mass of the Sun and 1.8[7] times the Sun's radius. Mu2 Cancri has relatively high metallicity − what astronomers term the abundance of elements other than hydrogen and helium − having a 29% higher abundance compared to the Sun,[6] it is radiating 3.45[8] times the Sun's luminosity at an effective temperature of 5,809 K.[6]


  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 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J. 
  3. ^ a b Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770Freely accessible, Bibcode:2006AJ....132..161G, doi:10.1086/504637. 
  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:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ a b Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: 31, arXiv:1204.2459Freely accessible, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, A116. 
  6. ^ a b c d e f g h Ramírez, I.; et al. (February 2013), "Oxygen abundances in nearby FGK stars and the galactic chemical evolution of the local disk and halo", The Astrophysical Journal, 764 (1): 78, arXiv:1301.1582Freely accessible, Bibcode:2013ApJ...764...78R, doi:10.1088/0004-637X/764/1/78. 
  7. ^ a b Takeda, Genya; et al. (February 2007), "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog", The Astrophysical Journal Supplement Series, 168 (2): 297–318, arXiv:astro-ph/0607235Freely accessible, Bibcode:2007ApJS..168..297T, doi:10.1086/509763. 
  8. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  9. ^ "mu.02 Cnc -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-17. 
  10. ^ 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. 
  11. ^ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648Freely accessible, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, A35.