53 Cancri

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

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.

The star is moving further away from the Earth with a heliocentric radial velocity of +14 km/s.[3] 53 Cancri is an aging red giant on the asymptotic giant branch[5] and has a stellar classification of M3 III.[3] 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.[1]

53 Cancri is a semiregular variable that varies between magnitude 5.9 and 6.4 with a period of 27 days.[2] There is a suspected second period of 270 days.[6]


  1. ^ a b c d e f g h i 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. ^ a b c 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.
  3. ^ a b c d e 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.
  4. ^ "53 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-06.
  5. ^ Lebzelter, T.; Hron, J. (2003), "Technetium and the third dredge up in AGB stars", Astronomy & Astrophysics, 411 (3): 533–542, arXiv:astro-ph/0610500, doi:10.1051/0004-6361:20031458.
  6. ^ Glass, I. S.; Van Leeuwen, F. (2007), "Semiregular variables in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society, 378 (4): 1543, arXiv:0704.3150, Bibcode:2007MNRAS.378.1543G, doi:10.1111/j.1365-2966.2007.11903.x.