53 Cancri

53 Cancri is a variable star in the zodiac constellation Cancer, located around 960 light years from the Sun. It has the variable star designation BO Cancri; 53 Cancri is the Flamsteed designation. This object is a challenge to view with the naked eye, having an apparent visual magnitude around 6. It is around 960 light years away.

53 Cancri

A light curve for BO Cancri, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08h 52m 28.58850s[2]
Declination +28° 15′ 32.9851″[2]
Apparent magnitude (V) 5.9 - 6.4[3]
Characteristics
Evolutionary stage red giant
Spectral type M3 III[4]
B−V color index 1.552±0.010[4]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)+13.82±0.29[4] km/s
Proper motion (μ) RA: −15.212[2] mas/yr
Dec.: −7.961[2] mas/yr
Parallax (π)3.4133 ± 0.1685 mas[2]
Distance960 ± 50 ly
(290 ± 10 pc)
Details
Radius87[2] R☉
Luminosity1,175[2] L☉
Temperature3,622[2] K
Other designations
53 Cnc, BO Cancri, BD+28°1659, HD 75716, HIP 43575, HR 3521, SAO 80476[5]
Database references
SIMBADdata

The star is moving further away from the Earth with a heliocentric radial velocity of +14 km/s.[4] 53 Cancri is an aging red giant on the asymptotic giant branch[6] and has a stellar classification of M3 III.[4] It has expanded to 87 times the radius of the Sun, and its bolometric luminosity is over a thousand times higher than the Sun's at an effective temperature of 3,622 K.[2]

53 Cancri is a semiregular variable that varies between magnitude 5.9 and 6.4 with a period of 27 days.[3] There is a suspected second period of 270 days.[7]

References
  1. "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  2. 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.
  3. Samus, N. N.; Durlevich, O. V.; et al. (2009), "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S, 1: B/gcvs, Bibcode:2009yCat....102025S.
  4. 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.
  5. "53 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-06.
  6. Lebzelter, T.; Hron, J. (2003), "Technetium and the third dredge up in AGB stars", Astronomy & Astrophysics, 411 (3): 533–542, arXiv:astro-ph/0610500, Bibcode:2003A&A...411..533L, doi:10.1051/0004-6361:20031458, S2CID 18879265.
  7. Glass, I. S.; Van Leeuwen, F. (2007), "Semiregular variables in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society, 378 (4): 1543–1549, arXiv:0704.3150, Bibcode:2007MNRAS.378.1543G, doi:10.1111/j.1365-2966.2007.11903.x, S2CID 14332208.
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