8 Cancri
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 05m 04.48834s[1] |
| Declination | +13° 07′ 05.5757″[1] |
| Apparent magnitude (V) | +5.14[2] |
| Characteristics | |
| Spectral type | A1 V[3] |
| B−V color index | 0.018±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | +21.0±4.2[4] km/s |
| Proper motion (μ) | RA: −35.78[1] mas/yr Dec.: −63.81[1] mas/yr |
| Parallax (π) | 15.20 ± 0.32 mas[1] |
| Distance | 215 ± 5 ly (66 ± 1 pc) |
| Absolute magnitude (MV) | 1.05[2] |
| Details | |
| Mass | 2.37[5] M☉ |
| Luminosity | 36.6[2] L☉ |
| Surface gravity (log g) | 4.29±0.14[5] cgs |
| Temperature | 10,352±352[5] K |
| Rotational velocity (v sin i) | 173[5] km/s |
| Age | 144[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
8 Cancri is a single,[7] white-hued star in the zodiac constellation of Cancer. It has an apparent visual magnitude of +5.14,[2] which indicates it is faintly visible to the naked eye under suitable viewing conditions. The distance to this star, as determined from its annual parallax shift of 15.20 mas,[1] is around 215 light years. A radial velocity of +21 km/s indicates it is moving away from the Sun.[4]
This is an A-type main-sequence star with a stellar classification of A1 V.[3] It is a young star with an estimated age of just 144[5] million years, and has a high rate of spin with a projected rotational velocity of 173 km/s.[5] 8 Cancri has 2.37[5] times the mass of the Sun and is radiating 36.6[2] times the Sun's luminosity from its photosphere at an effective temperature of around 10,352 K.[5]
References
[edit]- ^ 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 d e f 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 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b 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.
- ^ a b c d e f g h i 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.
- ^ "8 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-09.
- ^ 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.
