12 Cancri

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12 Cancri
Лучевая скорость (Rv)  км/c
Собственное движение
 • прямое восхождение  mas в год
 • склонение  mas в год

Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end

12 Cancri is a star in the zodiac constellation Cancer. It has an apparent visual magnitude of 6.25,[1] placing just below the normal limit for stars visible to the naked eye in good seeing conditions. The star displays an annual parallax shift of 12.7 mas as seen from Earth's orbit, which places it at a distance of about 257 light-years. It is moving toward the Sun with a radial velocity of around −10 km/s.[2]

This is an ordinary F-type main-sequence star with a stellar classification of F3 V,[3] which indicates it is generating energy through hydrogen fusion at its core. It is spinning with a projected rotational velocity of 52[4] km/s and appears to be undergoing solar-like differential rotation with relative rate of α = 0,33 ± 0,13.[5] The star is about 2.5[6] billion years old with 1.16[6] times the mass of the Sun and is radiating nearly 18[1] times the Sun's luminosity from its photosphere at an effective temperature of around 6357.[7]


  1. а б Anderson, E. & Francis, Ch. (2012), XHIP: An extended hipparcos compilation, Astronomy Letters Т. 38 (5): 331, DOI 10.1134/S1063773712050015 
  2. de Bruijne, J. H. J. & Eilers, A.-C. (October 2012), Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics Т. 546: 14, A61, DOI 10.1051/0004-6361/201219219 
  3. Balachandran, Suchitra (May 1, 1990), Lithium depletion and rotation in main-sequence stars, Astrophysical Journal, Part 1 Т. 354: 310–332, DOI 10.1086/168691 
  4. Ammler-von Eiff, Matthias & Reiners, Ansgar (June 2012), New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?, Astronomy & Astrophysics Т. 542: A116, DOI 10.1051/0004-6361/201118724 
  5. Reiners, Ansgar & Schmitt, Jürgen H. M. M. (December 2003), Differential rotation in rapidly rotating F-stars, Astronomy and Astrophysics Т. 412 (3): 813−819, DOI 10.1051/0004-6361:20034255 
  6. а б 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 Т. 804 (2): 146, DOI 10.1088/0004-637X/804/2/146 
  7. Casagrande, L.; Schönrich, R.; Asplund, M. & Cassisi, S. (June 2011), New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey, Astronomy and Astrophysics Т. 530: A138, DOI 10.1051/0004-6361/201016276 
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Шаблон:Stars of Cancer