Astronomy:20 Cancri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 23m 21.84287s[1] |
| Declination | +18° 19′ 55.7825″[1] |
| Apparent magnitude (V) | 5.94[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A9 V[3] |
| B−V color index | 0.175[2] |
| Astrometry | |
| Radial velocity (Rv) | +35.8±2.9[4] km/s |
| Proper motion (μ) | RA: −51.953[1] mas/yr Dec.: −19.416[1] mas/yr |
| Parallax (π) | 8.7606 ± 0.0986[1] mas |
| Distance | 372 ± 4 ly (114 ± 1 pc) |
| Absolute magnitude (MV) | +0.63[2] |
| Details | |
| Mass | 2.41±0.10[3] M☉ |
| Radius | 3.7[1] R☉ |
| Luminosity | 59.9+19.9 −15.0[3] L☉ |
| Surface gravity (log g) | 3.62[1] cgs |
| Temperature | 7,907±73[3] K |
| Metallicity [Fe/H] | −0.30[1] dex |
| Rotational velocity (v sin i) | 50[3] km/s |
| Age | 700[1] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
20 Cancri is an astrometric binary[6] star system in the constellation Cancer, located about 372 light-years away from the Sun. This system has the Bayer designation d1 Cancri; 20 Cancri is the Flamsteed designation.[5] It is just visible to the naked eye under good viewing conditions, appearing as a dim, white-hued star with an apparent visual magnitude of 5.94.[2] The pair are moving further from the Earth with a heliocentric radial velocity of +36 km/s,[4] and are members of the Hyades Supercluster.[7]
The visible component of this system is an ordinary A-type main-sequence star with a stellar classification of A9 V,[3] which indicates it is generating energy by hydrogen fusion at its core. It has 2.4 times the mass of the Sun and is radiating 60 times the Sun's luminosity from its photosphere at an effective temperature of 7,907 K.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 4.0 4.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 "20 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=20+Cnc.
- ↑ Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal 129 (5): 2420–2427, doi:10.1086/429590, Bibcode: 2005AJ....129.2420M.
- ↑ Eggen, Olin J. (April 1996), "The Stellar Content of Star Stream I", Astronomical Journal 111: 1615, doi:10.1086/117901, Bibcode: 1996AJ....111.1615E.
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