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83 Cancri is an astrometric binary star system in the northern constellation of Cancer, positioned near the constellation border with Leo. It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.61. Despite having a Flamsteed designation, the system was too faint to be included in the Bright Star Catalogue. It is located at a distance of 133 light years from the Sun, based on parallax, but is drifting closer with a radial velocity of −15 km/s. 83 Cancri has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.185″ per annum.

The pair have an orbital period of around 32 days and an eccentricity of about 0.6. The visible member of this system, designated component A, is an F-type main-sequence star with a stellar classification of F4V. Its atmosphere is enhanced with s-process elements, particularly strontium and yttrium, which is attributed to mass transfer from the companion while the latter was on the asymptotic giant branch. The primary is 3.1 billion years old with 1.1 times the mass of the Sun and 1.5 times the Sun's radius. It is radiating 3.1 times the luminosity of the Sun from its photosphere at an effective temperature of 6,218 K. The unseen secondary companion is most likely a high mass white dwarf, having around 1.3 times the Sun's mass.

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. ^ Goncharov, G. A.; Kiyaeva, O. V. (April 2002), "Astrometric Orbits from a Direct Combination of Ground-Based Catalogs with the Hipparcos Catalog", Astronomy Letters, 28 (4): 261–271, Bibcode:2002AstL...28..261G, doi:10.1134/1.1467262, S2CID 121692881.
4. ^ 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.
5. "83 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 August 2017.
6. Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv:1401.6827, Bibcode:2014AJ....147...87T, doi:10.1088/0004-6256/147/4/87, S2CID 56066740, 87.
7. 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.
8. Bidelman, W. P. (December 1990), "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"", Bulletin d'Information du Centre de Données Stellaires, 38: 13, Bibcode:1990BICDS..38...13B.
9. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
10. Reddy, Bacham E.; et al. (March 2003), "The chemical compositions of Galactic disc F and G dwarfs", Monthly Notices of the Royal Astronomical Society, 340 (1): 304–340, arXiv:astro-ph/0211551, Bibcode:2003MNRAS.340..304R, doi:10.1046/j.1365-8711.2003.06305.x, S2CID 14388692.

v t e Constellation of Cancer
Cancer in Chinese astronomy List of stars in Cancer
Stars	Bayer α (Acubens) β (Tarf) γ (Asellus Borealis) δ (Asellus Australis) ε (Meleph) ζ (Tegmine) ζ η θ ι κ λ (Piautos) μ μ ν ξ (Nahn) ο ο π π ρ (Copernicus) ρ σ σ σ τ υ υ φ φ χ ψ ψ ω ω Flamsteed 1 3 5 7 8 11 12 15 20 (d) 21 24 25 (d) 27 28 (CX) 29 34 35 36 (c) 37 38 39 40 42 44 45 (A) 46 49 (b) 50 (A) 53 54 57 60 61 66 67 68 70 71 75 78 79 80 83 Variable R X RS VZ AZ DX EI HL HM HD 72945 72946 73534 (Gakyid) 79498 Other GJ 3470 (Kaewkosin) HIP 41378 K2-187 LHS 2090 Pr0211 WD J0914+1914 YBP 1194
Exoplanets 55 Cancri b c d e f β Cancri b GJ 3470 b HD 73534 b HIP 41378 b c d e f Pr0201 b
Star clusters Beehive Cluster Messier 67
Nebulae Abell 30 Abell 31
Galaxies	NGC 2503 2535 2536 2608 2623 2648 2775 2801 2803 2804 2812 Other 3C 191 3C 212 3C 215 DLA0817g IC 2431 OJ 287 QSO B0839+187 UGC 4457 4C +29.30 SDSS J0849+1114
Galaxy clusters Abell 671 Musket Ball Cluster
Category

• F-type main-sequence stars
• White dwarfs
• Astrometric binaries
• Cancer (constellation)
• Durchmusterung objects
• Flamsteed objects
• Henry Draper Catalogue objects
• Hipparcos objects