Star in the constellation Cancer
For other stars with this Bayer designation , see υ Cancri .
Upsilon Cancri , Latinised from υ Cancri, is the Bayer designation for a solitary, yellow-white-hued star in the constellation Cancer . It is faintly visible with the naked eye, having an apparent visual magnitude of +5.7. Based upon an annual parallax shift of 13.05 mas as seen from Earth, this system is roughly 250 light-years from the Sun .
This object has a stellar classification of F0 IIIn, indicating it is an F-type giant star . The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation, and it shows a relatively high projected rotational velocity of 109.2 km/s. It is a variable star of unknown type that varies in brightness with an amplitude of 0.05 magnitude. The star is about 570 million years old and it has an estimated mass of 1.47 times that of the Sun . On average, it is radiating 25 times the Sun's luminosity from its photosphere at an effective temperature of 7,240 K .
References
^ 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 .
^ 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 .
^ 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 .
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.
^ 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 .
^ 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 .
^ Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics , 493 (3): 1099–1107, Bibcode :2009A&A...493.1099S , doi :10.1051/0004-6361:200810377
"ups01 Cnc" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-06-10.Adelman, S. J. (October 2000), "On the Variability of A3-F0 Luminosity Class III-V Stars", Information Bulletin on Variable Stars , 4969 (4969): 1, Bibcode :2000IBVS.4969....1A .
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