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
Distance 149 ± 2 ly
(45.7 ± 0.5 pc)
Mass 2.02[5] M
Radius 1.86[6] R
Luminosity 13.4[7] L
Surface gravity (log g) 4.16[5] cgs
Temperature 8,636±294[5] K
Rotational velocity (v sin i) 90[5] km/s
Age 598[5] Myr
Other designations
ο1 Cnc, 62 Cancri, BD+15° 1945, HD 76543, HIP 43970, HR 3561, SAO 98247[8]
Database references

Omicron1 Cancri (ο1 Cnc, ο1 Cancri) is a solitary,[9] 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.[10]

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,[5] it has double[5] the mass of the Sun and 1.86 times the Sun's radius.[6] Omicron1 Cancri is radiating 13.4[7] times the solar luminosity from its photosphere at an effective temperature of about 8,636 K.[5]

Omicron1 Cancri has an infrared excess, indicating it surrounded by a circumstellar debris disk.[6] The signature matches a two-component disk with the spatially-separated belts having temperatures of 146 K and 81 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, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, 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, Bibcode:2012A&A...546A..61D, arXiv:1208.3048Freely accessible, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ 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, Bibcode:2015ApJ...804..146D, arXiv:1501.03154Freely accessible, doi:10.1088/0004-637X/804/2/146. 
  6. ^ 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, Bibcode:2007ApJ...660.1556R, arXiv:astro-ph/0609555Freely accessible, doi:10.1086/509912. 
  7. ^ a b c Vican, Laura; et al. (December 2016), "Herschel Observations of Dusty Debris Disks", The Astrophysical Journal, 833 (2): 19, Bibcode:2016ApJ...833..263V, doi:10.3847/1538-4357/833/2/263, 263. 
  8. ^ "omi01 Cnc -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-15. 
  9. ^ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x. 
  10. ^ 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, Bibcode:2011ApJS..192....2S, doi:10.1088/0067-0049/192/1/2, 2.