Sigma1 Cancri

Sigma1 Cancri, Latinized from σ1 Cancri, is a solitary,[9] white-hued star in the zodiac constellation of Cancer. It is faintly visible to the naked eye, with an apparent visual magnitude of +5.68.[2] Based upon an annual parallax shift of 15.51 mas as seen from Earth,[1] this star is located around 210 light years from the Sun.

For other stars with this Bayer designation, see σ Cancri.
Sigma1 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 08h 52m 34.62123s[1]
Declination +32° 28′ 26.9664″[1]
Apparent magnitude (V) +5.68[2]
Characteristics
Spectral type A8 Vas[3]
U−B color index +0.08[2]
B−V color index +0.20[2]
Astrometry
Radial velocity (Rv)−13.5±4.3[4] km/s
Proper motion (μ) RA: −4.41[1] mas/yr
Dec.: +13.95[1] mas/yr
Parallax (π)15.51 ± 0.41[1] mas
Distance210 ± 6 ly
(64 ± 2 pc)
Absolute magnitude (MV)+1.62[5]
Details
Mass1.70[6] M☉
Luminosity18[7] L☉
Surface gravity (log g)4.44[6] cgs
Temperature8,116±276[6] K
Rotational velocity (v sin i)84[7] km/s
Age301[6] Myr
Other designations
σ1 Cnc, 51 Cancri, BD+33° 1770, HD 75698, HIP 43584, HR 3519, SAO 61102[8]
Database references
SIMBADdata

This is a chemically peculiar[7] A-type main sequence star with a stellar classification of A8 Vas.[3] At an age of about 301[6] million years, Sigma1 Cancri is around 67% of the way through its main sequence lifespan.[7] The star has 1.7[6] times the mass of the Sun and is radiating 18[7] times the Sun's luminosity from its photosphere at an effective temperature of 8,116 K.[6] It has a magnitude 13.3 visual companion at an angular separation of 5.2 arc seconds along a position angle of 276°, as of 2011.[10]

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. Guetter, H. H.; Hewitt, A. V. (1984), "Photoelectric UBV photometry for 317 PZT and VZT stars", Astronomical Society of the Pacific, 96: 441–443, Bibcode:1984PASP...96..441G, doi:10.1086/131362.
  3. Barry, Don C. (January 1970), "Spectral Classification of a and F Stars", Astrophysical Journal Supplement, 19: 281, Bibcode:1970ApJS...19..281B, doi:10.1086/190209.
  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. 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.
  8. "* sig01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-13.
  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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
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