| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 56m 56.59711s [1] |
| Declination | +32° 54′ 37.5423″ [1] |
| Apparent magnitude (V) | +5.436 [2] |
| Characteristics | |
| Spectral type | A7 IV [3] |
| B−V color index | +0.157 [2] |
| Astrometry | |
| Radial velocity (Rv) | −26.2±0.7 [4] km/s |
| Proper motion (μ) |
RA: −53.49
[1]
mas/
yr Dec.: −66.13 [1] mas/ yr |
| Parallax (π) | 16.79 ± 0.29 mas [1] |
| Distance | 194 ± 3
ly (60 ± 1 pc) |
| Absolute magnitude (MV) | +1.57 [5] |
| Details | |
| Mass | 1.79 [6] M☉ |
| Luminosity | 21.5 [3] L☉ |
| Surface gravity (log g) | 4.17 [6] cgs |
| Temperature | 8,309±283 [6] K |
| Rotational velocity (v sin i) | 133 [3] km/s |
| Age | 441 [6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Sigma2 Cancri, Latinized from σ2 Cancri, is the Bayer designation for a solitary, [8] white-hued star in the constellation Cancer. It is faintly visible to the naked eye, with an apparent visual magnitude of +5.44. [2] Based upon an annual parallax shift of 16.79 mas as seen from Earth, [1] this star is located around 194 light years from the Sun.
With an estimated age of 441 [6] million years, this is an A-type subgiant star with a stellar classification of A7 IV. [3] It is spinning relatively rapidly with a projected rotational velocity of 133 K. [3] The star has an estimated 1.8 [6] times the mass of the Sun and is radiating 21.5 [3] times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,309 K. [6]
References
- ^ a b c d e f 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.
- ^ a b c 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.
- ^ a b c d e f 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.
- ^ 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.
- ^ a b c d e f g 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.
-
^
"sig02 Cnc".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2017-06-12.
{{ cite web}}: CS1 maint: postscript ( link) - ^ 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.
