12 Cancri is a star in the zodiac constellation Cancer. It has an apparent visual magnitude of 6.25,[2] 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.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 08m 42.4457s[1] |
| Declination | +13° 38′ 27.307″[1] |
| Apparent magnitude (V) | 6.25[2] |
| Characteristics | |
| Spectral type | F3 V[3] |
| B−V color index | 0.480±0.007[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.0±4.3[4] km/s |
| Proper motion (μ) | RA: +2.776[1] mas/yr Dec.: −14,723[1] mas/yr |
| Parallax (π) | 12.7085 ± 0.1327 mas[1] |
| Distance | 257 ± 3 ly (78.7 ± 0.8 pc) |
| Absolute magnitude (MV) | 1.59[5] |
| Details | |
| Mass | 1.16[6] M☉ |
| Luminosity | 17.94[2] L☉ |
| Surface gravity (log g) | 3.60±0.14[6] cgs |
| Temperature | 6,357±88[7] K |
| Metallicity [Fe/H] | 0.04[7] dex |
| Rotational velocity (v sin i) | 52.3±4.1[5] km/s |
| Age | 2.466[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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[5] km/s and appears to be undergoing solar-like differential rotation with relative rate of α = 0.33±0.13.[9] 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[2] times the Sun's luminosity from its photosphere at an effective temperature of around 6,357 K.[7]
References
edit- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e 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 Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691.
- ^ 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 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, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
- ^ a b c d e 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.
- ^ a b c Casagrande, L.; et al. (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, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
- ^ "12 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-09.
- ^ Reiners, Ansgar; Schmitt, Jürgen H. M. M. (December 2003), "Differential rotation in rapidly rotating F-stars", Astronomy and Astrophysics, 412 (3): 813−819, arXiv:astro-ph/0309616, Bibcode:2003A&A...412..813R, doi:10.1051/0004-6361:20034255, S2CID 16900202.