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Sigma2 Cancri

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White-hued subgiant star in the constellation Cancer For other stars with this Bayer designation, see σ Cancri.
Sigma Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 08 56 56.59711
Declination +32° 54′ 37.5423″
Apparent magnitude (V) +5.436
Characteristics
Spectral type A7 IV
B−V color index +0.157
Astrometry
Radial velocity (Rv)−26.2±0.7 km/s
Proper motion (μ) RA: −53.49 mas/yr
Dec.: −66.13 mas/yr
Parallax (π)16.79 ± 0.29 mas
Distance194 ± 3 ly
(60 ± 1 pc)
Absolute magnitude (MV)+1.57
Details
Mass1.79 M☉
Luminosity21.5 L☉
Surface gravity (log g)4.17 cgs
Temperature8,309±283 K
Rotational velocity (v sin i)133 km/s
Age441 Myr
Other designations
σ Cnc, 59 Cancri, BD+33° 1785, HD 76398, HIP 43932, HR 3555, SAO 61146
Database references
SIMBADdata

Sigma Cancri, Latinized from σ Cancri, is the Bayer designation for a solitary, white-hued star in the constellation Cancer. It is faintly visible to the naked eye, with an apparent visual magnitude of +5.44. Based upon an annual parallax shift of 16.79 mas as seen from Earth, this star is located around 194 light years from the Sun.

With an estimated age of 441 million years, this is an A-type subgiant star with a stellar classification of A7 IV. It is spinning relatively rapidly with a projected rotational velocity of 133 K. The star has an estimated 1.8 times the mass of the Sun and is radiating 21.5 times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,309 K.

References

  1. ^ 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, S2CID 18759600.
  2. ^ Høg, E.; et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27 – L30, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
  3. ^ Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  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, S2CID 59451347, 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, S2CID 119257644.
  6. ^ 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, S2CID 33401607.
  7. "sig02 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-12.{{cite web}}: CS1 maint: postscript (link)
  8. 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, S2CID 14878976.
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