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53 Cancri

A light curve for BO Cancri, plotted from Hipparcos data
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cancer
Right ascension	08 52 28.58850
Declination	+28° 15′ 32.9851″
Apparent magnitude (V)	5.9 - 6.4
Characteristics
Evolutionary stage	red giant
Spectral type	M3 III
B−V color index	1.552±0.010
Variable type	SRb
Astrometry
Radial velocity (Rv)	+13.82±0.29 km/s
Proper motion (μ)	RA: −15.212 mas/yr Dec.: −7.961 mas/yr
Parallax (π)	3.4133 ± 0.1685 mas
Distance	960 ± 50 ly (290 ± 10 pc)
Details
Radius	87 R☉
Luminosity	1,175 L☉
Temperature	3,622 K
Other designations
53 Cnc, BO Cancri, BD+28°1659, HD 75716, HIP 43575, HR 3521, SAO 80476
Database references
SIMBAD	data

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. 53 Cancri is an aging red giant on the asymptotic giant branch and has a stellar classification of M3 III. 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.

In 1969, Olin Jeuck Eggen announced that small vaiarions in the brightness of 53 Cancri had been detected. For that reason it was given a variable star designation in 1972. 53 Cancri is a semiregular variable that varies between magnitude 5.9 and 6.4 with a period of 27 days. There is a suspected second period of 270 days.

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. Eggen, O. J. (June 1969). "Light Variations of Small Amplitude in the Red Giants of the Disc Population" (PDF). Information Bulletin on Variable Stars. 355. Bibcode:1969IBVS..355....1E. Retrieved 8 December 2024.
8. Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (September 1972). "58th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 717: 1–36. Bibcode:1972IBVS..717....1K. Retrieved 8 December 2024.
9. 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.

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

• M-type giants
• Semiregular variable stars
• Cancer (constellation)
• Durchmusterung objects
• Flamsteed objects
• Henry Draper Catalogue objects
• Bright Star Catalogue objects
• Hipparcos objects
• Objects with variable star designations