20 Cancri

20 Cancri is an astrometric binary[6] star system in the constellation Cancer, located about 348 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]

This article is about d1 Cancri. For other stars with this Bayer designation, see d Cancri.
20 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08h 23m 21.84311s[1]
Declination +18° 19′ 55.7859″[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: −52.104[1] mas/yr
Dec.: −19.683[1] mas/yr
Parallax (π)9.3688 ± 0.2058[1] mas
Distance348 ± 8 ly
(107 ± 2 pc)
Absolute magnitude (MV)0.63[2]
Details
Mass2.41±0.10[3] M☉
Luminosity59.9+19.9
−15.0[3] L☉
Temperature7,907±73[3] K
Rotational velocity (v sin i)50[3] km/s
Other designations
d1 Cnc, 20 Cnc, BD+18°1930, FK5 1220, HD 70569, HIP 41117, HR 3284, SAO 97781[5]
Database references
SIMBADdata

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. 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.
  2. 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.
  3. 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.
  4. 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.
  5. "20 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-25.
  6. Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal, 129 (5): 2420–2427, Bibcode:2005AJ....129.2420M, doi:10.1086/429590.
  7. Eggen, Olin J. (April 1996), "The Stellar Content of Star Stream I", Astronomical Journal, 111: 1615, Bibcode:1996AJ....111.1615E, doi:10.1086/117901.
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