Omicron1 Cancri

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Omicron1 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension  08h 57m 14.95026s[1]
Declination +15° 19′ 21.9512″[1]
Apparent magnitude (V) +5.20[2]
Spectral type A5 III[3]
B−V color index +0.1540[2]
Radial velocity (Rv)−4.6±2.8[4] km/s
Proper motion (μ) RA: +61.47[1] mas/yr
Dec.: +19.40[1] mas/yr
Parallax (π)21.87 ± 0.26[1] mas
Distance149 ± 2 ly
(45.7 ± 0.5 pc)
Absolute magnitude (MV)+1.92[5]
Mass2.02[6] M
Radius1.86[7] R
Luminosity13.4[8] L
Surface gravity (log g)4.16[6] cgs
Temperature8,636±294[6] K
Rotational velocity (v sin i)90[6] km/s
Age598[6] Myr
Other designations
ο1 Cnc, 62 Cancri, BD+15° 1945, HD 76543, HIP 43970, HR 3561, SAO 98247[9]
Database references

Omicron1 Cancri, Latinized from ο1 Cancri, is a solitary,[10] white-hued star in the zodiac constellation of Cancer, it is visible to the naked eye with an apparent visual magnitude of +5.20.[2] Based upon an annual parallax shift of 21.87 mas as seen from Earth,[1] this star is located around 149 light years from the Sun. It most likely forms a co-moving pair with Omicron2 Cancri.[11]

With a stellar classification of A5 III,[3] this appears to be an evolved, A-type giant star. At the age of about 600 million years,[6] it has double[6] the mass of the Sun and 1.86 times the Sun's radius.[7] Omicron1 Cancri is radiating 13.4[8] times the solar luminosity from its photosphere at an effective temperature of about 8,636 K.[6]

Omicron1 Cancri has an infrared excess, indicating it surrounded by a circumstellar debris disk;[7] the signature matches a two-component disk with the spatially-separated belts having temperatures of 146 K and 81 K.[8]


  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 Häggkvist, L.; Oja, T. (1966), "Photoelectric photometry of bright stars", Arkiv för Astronomii, 4: 137–163, Bibcode:1966ArA.....4..137H.
  3. ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  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 c d e f g h David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  7. ^ a b c Rhee, Joseph H.; et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs", The Astrophysical Journal, 660 (2): 1556–1571, arXiv:astro-ph/0609555, Bibcode:2007ApJ...660.1556R, doi:10.1086/509912.
  8. ^ a b c Vican, Laura; et al. (December 2016), "Herschel Observations of Dusty Debris Disks", The Astrophysical Journal, 833 (2): 19, arXiv:1607.03754, Bibcode:2016ApJ...833..263V, doi:10.3847/1538-4357/833/2/263, 263.
  9. ^ "omi01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-15.
  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:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  11. ^ Shaya, Ed J.; Olling, Rob P. (January 2011), "Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue", The Astrophysical Journal Supplement, 192 (1): 17, arXiv:1007.0425, Bibcode:2011ApJS..192....2S, doi:10.1088/0067-0049/192/1/2, 2.