53 Cancri

53 Cancri

A light curve for BO Cancri, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer[2]
Right ascension 08h 52m 28.58850s[3]
Declination +28° 15′ 32.9851″[3]
Apparent magnitude (V) 5.9 - 6.4[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type M3 III[2]
B−V color index 1.552±0.010[2]
Variable type SRb[4]
Astrometry
Radial velocity (Rv)+13.82±0.29[2] km/s
Proper motion (μ) RA: −15.212[3] mas/yr
Dec.: −7.961[3] mas/yr
Parallax (π)3.4133±0.1685 mas[3]
Distance960 ± 50 ly
(290 ± 10 pc)
Details
Radius87[3] R☉
Luminosity1,175[3] L☉
Temperature3,622[3] K
Other designations
53 Cnc, BO Cancri, BD+28°1659, HD 75716, HIP 43575, HR 3521, SAO 80476[6]
Database references
SIMBADdata

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.[2] 53 Cancri is an aging red giant on the asymptotic giant branch[5] and has a stellar classification of M3 III.[2] 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.[3]

In 1969, Olin Jeuck Eggen announced that small vaiarions in the brightness of 53 Cancri had been detected.[7] For that reason it was given a variable star designation in 1972.[8] 53 Cancri is a semiregular variable that varies between magnitude 5.9 and 6.4 with a period of 27 days.[4] There is a suspected second period of 270 days.[9]

References

  1. ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  2. ^ a b c d e f 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. XHIP record for this object at VizieR.
  3. ^ 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.
  4. ^ 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.
  5. ^ a b 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.
  6. ^ "53 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-06.
  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.

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