View source for 27 Cancri

{{Short description|Star in the constellation Cancer}}
{{Starbox begin
| name = 27 Cancri
}}
{{Starbox observe
| epoch = J2000.0
| constell = [[Cancer (constellation)|Cancer]]
| ra  = {{RA|08|26|43.94035}}<ref name=GaiaDR2/>
| dec = {{DEC|+12|39|16.6066}}<ref name=GaiaDR2/>
| appmag_v = +5.56<ref name=Anderson2012/>
}}
{{Starbox character
| type  = [[Asymptotic giant branch]]<ref name=Lebzelter2003/>
| class = M3&nbsp;IIIa<ref name=perkins1989/>
| b-v   = {{Val|1.608|0.002}}<ref name=Anderson2012/>
| u-b   =
| variable = [[Semiregular variable star|SRb]]<ref name=Lebzelter2003/>
}}
{{Starbox astrometry
| radial_v = {{Val|−8.30|0.31}}<ref name=deBruijne2012/>
| prop_mo_ra  = −19.760<ref name=GaiaDR2/>
| prop_mo_dec = −104.664<ref name=GaiaDR2/>
| parallax = 3.3094
| p_error  = 0.3176
| parallax_footnote = <ref name=GaiaDR2/>
| absmag_v = −1.62<ref name=Anderson2012/>
}}
{{Starbox detail
| source   =
| mass     =
| radius   = 119<ref name=GaiaDR2/>
| luminosity  = {{Val|2455|707|550|fmt=commas}}<ref name=Maas2016/>
| temperature = 3,574<ref name=Maas2016/>
| gravity  = 1.00<ref name=Maas2016/>
| metal_fe = 0.00<ref name=Maas2016/>
| rotational_velocity =
| age_gyr  =
}}
{{Starbox catalog
| names = {{odlist | V=BP&nbsp;Cancri | F=27&nbsp;Cnc | BD=+13°1912 | FK5=2658 | HD=71250 | HIP=41400 | HR=3319 | SAO=97819 | GC=11525 | AAVSO=0821+13 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = 27+Cnc
}}
{{Starbox end}}
'''27 Cancri''' is a single<ref name=Eggleton2008/> [[star]] in the [[zodiac]] [[constellation]] of [[Cancer (constellation)|Cancer]], located around 990&nbsp;[[light-year]]s away from the [[Sun]].<ref name=GaiaDR2/> It is visible to the naked eye as a faint, red-hued star with a typical [[apparent visual magnitude]] of around +5.56.<ref name=Anderson2012/> The star is moving closer to the Earth with a heliocentric [[radial velocity]] of −8.3&nbsp;km/s.<ref name=deBruijne2012/> It is a member of the [[Arcturus stream]], a group of stars with high proper motion and metal-poor properties thought to be the remnants of a small galaxy consumed by the [[Milky Way]].<ref name="eggen71a"/>
This is an aging [[red giant]] with a [[stellar classification]] of M3&nbsp;IIIa,<ref name=perkins1989/> currently on the [[asymptotic giant branch]].<ref name=Lebzelter2003/> It is classified as a [[semiregular variable star]] of type SRb and its brightness varies from magnitude +5.41 to +5.75 with a period of 40 days.<ref name=Samus2017/> The star is radiating around 2,455<ref name=Maas2016/> times the [[Sun's luminosity]] from its enlarged [[photosphere]] at an [[effective temperature]] of 3,574&nbsp;K.<ref name=Maas2016/>
==References==
{{Reflist|refs=
<ref name=SIMBAD>{{cite simbad | title=27 Cnc | access-date=2019-02-26 }}</ref>
<ref name=GaiaDR2>{{Cite Gaia DR2|650828355848334080}}</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=Samus2017>{{citation
| display-authors=1 | last1=Samus | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| title=General Catalogue of Variable Stars | version=5.1
| journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | postscript=. | doi=10.1134/S1063772917010085 | s2cid=125853869 }}</ref>
<ref name=Lebzelter2003>{{citation
| title=Technetium and the third dredge up in AGB stars. I. Field stars
| last1=Lebzelter | first1=T. | last2=Hron | first2=J.
| journal=Astronomy and Astrophysics
| volume=411 | issue=3 | pages=533–542 | date=December 2003
| doi=10.1051/0004-6361:20031458 | postscript=.
| bibcode=2003A&A...411..533L | arxiv=astro-ph/0310018 | s2cid=18879265 }}</ref>
<ref name=deBruijne2012>{{citation
| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C.
| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project
| journal=Astronomy & Astrophysics
| volume=546 | id=A61 | pages=14 | date=October 2012
| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D
| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}</ref>
<ref name=Maas2016>{{citation
| title=Chlorine Abundances in Cool Stars
| display-authors=1 | last1=Maas | first1=Z. G.
| last2=Pilachowski | first2=C. A. | last3=Hinkle | first3=K.
| journal=The Astronomical Journal
| volume=152 | issue=6 | id=196 | pages=14 | date=December 2016
| doi=10.3847/0004-6256/152/6/196 | bibcode=2016AJ....152..196M
| arxiv=1609.01626 | s2cid=118722950 | postscript=. | doi-access=free }}</ref>
<ref name=Eggleton2008>{{citation
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=[[Monthly Notices of the Royal Astronomical Society]]
| volume=389 | issue=2 | pages=869–879 | year=2008
| arxiv=0806.2878 | bibcode=2008MNRAS.389..869E
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976 | postscript=. }}</ref>
<ref name=perkins1989>{{citation
| title=The Perkins catalog of revised MK types for the cooler stars
| journal=Astrophysical Journal Supplement Series
| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.
| volume=71 | pages=245| year=1989 | postscript=.
| bibcode=1989ApJS...71..245K | doi=10.1086/191373 | s2cid=123149047
}}</ref>
<ref name="eggen71a">{{citation | postscript=.
| last=Eggen | first=Olin | title=The Arcturus Group
| journal=Publications of the Astronomical Society of the Pacific
| volume=83 | issue=493 | pages=271–85 | year=1971
| bibcode=1971PASP...83..271E | doi=10.1086/129120 | doi-access=free }}</ref>
}}
{{Stars of Cancer}}
{{DEFAULTSORT:27 Cancri}}
[[Category:M-type giants]]
[[Category:Semiregular variable stars]]
[[Category:Asymptotic-giant-branch stars]]
[[Category:Arcturus moving group]]
[[Category:Cancer (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Flamsteed objects|Cancri, 27]]
[[Category:Henry Draper Catalogue objects|071250]]
[[Category:Hipparcos objects|041400]]
[[Category:Bright Star Catalogue objects|3319]]
[[Category:Objects with variable star designations|Cancri, BP]]