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{{Short description|Red star in the constellation Cancer}}
{{Starbox begin
| name = 53 Cancri
}}
{{Starbox image
| image = [[Image:BOCncLightCurve.png|250px]]
| caption = A [[light curve]] for BO Cancri, plotted from ''[[Hipparcos]]'' data<ref name="CDS"/>
}}
{{Starbox observe
| epoch = J2000.0
| constell = [[Cancer (constellation)|Cancer]]
| ra = {{RA|08|52|28.58850}}<ref name=GaiaDR2/>
| dec = {{DEC|+28|15|32.9851}}<ref name=GaiaDR2/>
| appmag_v = 5.9 - 6.4<ref name=gcvs/>
}}
{{Starbox character
| type = red giant
| class = M3 III<ref name=Anderson2012/>
| b-v = {{Val|1.552|0.010}}<ref name=Anderson2012/>
| u-b =
| variable = [[Semiregular variable star|SRb]]<ref name=gcvs/>
}}
{{Starbox astrometry
| radial_v = {{Val|+13.82|0.29}}<ref name=Anderson2012/>
| prop_mo_ra = −15.212<ref name=GaiaDR2/>
| prop_mo_dec = −7.961<ref name=GaiaDR2/>
| parallax = 3.4133
| p_error = 0.1685
| parallax_footnote = <ref name=GaiaDR2/>
| absmag_v =
}}
{{Starbox detail
| source =
| mass =
| radius = 87<ref name=GaiaDR2/>
| luminosity = 1,175<ref name=GaiaDR2/>
| temperature = 3,622<ref name=GaiaDR2/>
| 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 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = 53+Cnc
}}
{{Starbox end}}

'''53 Cancri''' is a [[variable star]] in the [[zodiac]] [[constellation]] [[Cancer (constellation)|Cancer]], located around 960 [[light year]]s 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 year]]s away.

The star is moving further away from the Earth with a heliocentric [[radial velocity]] of +14 km/s.<ref name=Anderson2012/> 53 Cancri is an aging [[red giant]] on the [[asymptotic giant branch]]<ref name=lebzelter/> and has a [[stellar classification]] of M3 III.<ref name=Anderson2012/> 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}}.<ref name=GaiaDR2/>

In 1969, [[Olin J. Eggen|Olin Jeuck Eggen]] announced that small vaiarions in the brightness of 53 Cancri had been detected.<ref name="Eggen1969"/> For that reason it was given a variable star designation in 1972.<ref name="Kukarkin1972"/> 53 Cancri is a [[Semiregular variable star|semiregular variable]] that varies between magnitude 5.9 and 6.4 with a period of 27 days.<ref name=gcvs/> There is a suspected second period of 270 days.<ref name=glass2007/>

==References==
{{Reflist|refs=

<ref name=SIMBAD>{{cite simbad | title=53 Cnc | access-date=2019-03-06 }}</ref>

<ref name=GaiaDR2>{{Cite Gaia DR2|704966173799961728}}</ref>

<ref name="Kukarkin1972">{{cite journal
| 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}}</ref>

<ref name="Eggen1969">{{cite journal
| 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}}</ref>

<ref name=Anderson2012>{{citation
| 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=. }}</ref>

<ref name="CDS">{{cite web
| 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}}</ref>

<ref name=glass2007>{{citation
| 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=. }}</ref>

<ref name=gcvs>{{citation|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/gcvs|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009|postscript=.}}</ref>

<ref name=lebzelter>{{citation|doi=10.1051/0004-6361:20031458|title=Technetium and the third dredge up in AGB stars|journal=Astronomy & Astrophysics|volume=411|issue=3|pages=533–542|year=2003|last1=Lebzelter|first1=T.|last2=Hron|first2=J.|postscript=.|arxiv=astro-ph/0610500|bibcode=2003A&A...411..533L|s2cid=18879265}}</ref>

}}

{{Stars of Cancer}}

{{DEFAULTSORT:53 Cancri}}
[[Category:M-type giants]]
[[Category:Semiregular variable stars]]
[[Category:Cancer (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Flamsteed objects|Cancri, 53]]
[[Category:Henry Draper Catalogue objects|075716]]
[[Category:Bright Star Catalogue objects|3521]]
[[Category:Hipparcos objects|043575]]
[[Category:Objects with variable star designations|Cancri, BO]]

53 Cancri - Revision history

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