53 Cancri
{{Short description|Red star in the constellation Cancer}}
{{Starbox begin
| name = 53 Cancri
}}
{{Starbox image
| image = 250px
| caption = A light curve for BO Cancri, plotted from Hipparcos data
}}
{{Starbox observe
| epoch = J2000.0
| constell = Cancer
| dec = {{DEC|+28|15|32.9851}}
}}
{{Starbox character
| type = red giant
| u-b =
| variable = SRb
}}
{{Starbox astrometry
| radial_v = {{Val|+13.82|0.29}}
| parallax = 3.4133
| p_error = 0.1685
| absmag_v =
}}
{{Starbox detail
| source =
| mass =
| gravity =
| metal_fe =
| rotational_velocity =
| age_myr =
}}
{{Starbox catalog
| names = {{odlist | V=BO Cancri | F=53 Cnc | BD=+28°1659 | HD=75716 | HIP=43575 | HR=3521 | SAO=80476 }}
}}
{{Starbox reference
| Simbad = 53+Cnc
}}
{{Starbox end}}
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 {{val|3,622|fmt=commas|ul=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
{{Reflist|refs=
{{cite simbad | title=53 Cnc | access-date=2019-03-06 }}
{{Cite Gaia DR2|704966173799961728}}
| last1=Kukarkin | first1=B. V. | last2=Kholopov | first2=P. N.
| last3=Kukarkina | first3=N. P. | last4=Perova | first4=N. B.
| title=58th Name-List of Variable Stars | journal=Information Bulletin on Variable Stars
| date=September 1972 | volume=717 | pages=1–36
| bibcode=1972IBVS..717....1K | url=https://ibvs.konkoly.hu/pub/ibvs/0701/0717.pdf
| access-date=8 December 2024}}
| last1=Eggen | first1=O. J.
| title=Light Variations of Small Amplitude in the Red Giants of the Disc Population
| journal=Information Bulletin on Variable Stars | date=June 1969 | volume=355
| bibcode=1969IBVS..355....1E | url=https://ibvs.konkoly.hu/pub/ibvs/0301/0355.pdf
| access-date=8 December 2024}}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters | arxiv=1108.4971
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| s2cid=119257644 | postscript=. }}
| url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats
| website=Centre de Données astronomiques de Strasbourg | title=/ftp/cats/more/HIP/cdroms/cats
| publisher=Strasbourg astronomical Data Center |access-date=15 October 2022}}
| last1=Glass | first1=I. S. | last2=Van Leeuwen | first2=F.
| title=Semiregular variables in the solar neighbourhood
| journal=Monthly Notices of the Royal Astronomical Society
| volume=378 | issue=4 | pages=1543–1549 | year=2007
| bibcode=2007MNRAS.378.1543G | arxiv=0704.3150
| doi=10.1111/j.1365-2966.2007.11903.x | doi-access=free | s2cid=14332208 | postscript=. }}
}}
{{Stars of Cancer}}
{{DEFAULTSORT:53 Cancri}}
Category:Semiregular variable stars
Category:Cancer (constellation)