| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 09h 01m 24.13000s [1] |
| Declination | +32° 15′ 08.2666″ [1] |
| Apparent magnitude (V) | 5.870 [2] (5.95 + 8.56) [3] |
| Characteristics | |
| Evolutionary stage | main sequence [4] |
| Spectral type | A2 V [2] |
| B−V color index | 0.088±0.007 [5] |
| Astrometry | |
| Radial velocity (Rv) | −12.8±2.9 [6] km/s |
| Proper motion (μ) |
RA: +0.48
[7]
mas/
yr Dec.: +0.34 [7] mas/ yr |
| Parallax (π) | 6.8850 ± 0.1020 mas [1] |
| Distance | 474 ± 7
ly (145 ± 2 pc) |
| Absolute magnitude (MV) | 0.14 [5] |
| Details | |
| Mass | 2.73±0.11 [4] M☉ |
| Luminosity | 95.7+24.6 −19.5 [4] L☉ |
| Surface gravity (log g) | 4.0 [2] [4] cgs |
| Temperature | 8,974+230 −224 [4] K |
| Rotational velocity (v sin i) | 183 [4] km/s |
| Age | 162 [2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
66 Cancri is a binary star [9] system near the northern border of the zodiac constellation of Cancer, located 474 light years away from the Sun. It is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 5.87. [2] The pair are moving closer to the Earth with a heliocentric radial velocity of −13 light years. [6] As of 2003, the magnitude 8.56 companion was located at an angular separation of 4.43 ″ along a position angle of 134° from the primary. [9]
The brighter member of the system, designated component A, is an A-type main-sequence star with a stellar classification of A2 V. [2] It is around 162 [2] million years old with a high rate of spin, showing a projected rotational velocity of 183 km/s. [4] Estimates of the mass of the star range from 1.7 [10] up to 2.73 [4] times the mass of the Sun. It is radiating 96 [4] times the Sun's luminosity from its photosphere at an effective temperature of 8,974 K. [4]
References
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv: 1604.06456, Bibcode: 2016AJ....152...40G, doi: 10.3847/0004-6256/152/2/40, S2CID 119179065.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920.
- ^ a b c d e f g h i j Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv: 1201.2052, Bibcode: 2012A&A...537A.120Z, doi: 10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b 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 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 van Leeuwen, F. (November 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.
- ^ "66 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-09.
- ^ a b Roberts, Lewis C. Jr.; et al. (November 2005), "Adaptive Optics Photometry and Astrometry of Binary Stars", The Astronomical Journal, 130 (5): 2262–2271, Bibcode: 2005AJ....130.2262R, doi: 10.1086/491586.
- ^ Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 13, arXiv: 1604.06456, Bibcode: 2016AJ....152...40G, doi: 10.3847/0004-6256/152/2/40, S2CID 119179065, 40.
