View source for Astronomy:Xi Cancri

{{Short description|Spectroscopic binary star system in the constellation Cancer}}
{{Starbox begin
 | name = Xi Cancri
}}
{{Starbox observe
 | epoch = [[Astronomy:J2000.0|J2000.0]]
 | equinox = [[Astronomy:J2000.0|J2000.0]] ([[Astronomy:International Celestial Reference System|ICRS]])
 | constell = [[Astronomy:Cancer (constellation)|Cancer]]
 | ra = {{RA|09|09|21.53325}}<ref name=vanLeeuwen2007/>
 | dec = {{DEC|+22|02|43.6053}}<ref name=vanLeeuwen2007/>
 | appmag_v = +5.15<ref name=Sturch1972/> {{Nowrap|(5.70 + 6.20)}}<ref name=Malkov2012/>
}}
{{Starbox character
 | class = {{nowrap|G9 III Fe-1 CH-0.5}}<ref name=Anderson2012/>
 | b-v = +0.96<ref name=Sturch1972/>
 | u-b = +0.75<ref name=Sturch1972/>
 | r-i = 
 | variable = 
}}
{{Starbox astrometry
 | radial_v = {{Val|+7.7|0.3}}<ref name=deBruijne2012/>
 | prop_mo_ra = −1.00<ref name=vanLeeuwen2007/>
 | prop_mo_dec = −0.52<ref name=vanLeeuwen2007/>
 | parallax = 8.74
 | p_error = 0.49
 | parallax_footnote = <ref name=vanLeeuwen2007/>
 | absmag_v = −0.12<ref name=Anderson2012/>
}}
{{Starbox orbit
 | reference = <ref name=Pourbaix2004/><ref name=Jackson1957/>
 | axis = {{Val|0.0105|0.0017}}<ref name=Malkov2012/>
 | period_unitless = 1,700.76&nbsp;d
 | eccentricity = 0.06
 | periastron = {{nowrap|2,428,876.86 ± 10.0 [[Astronomy:Julian day|JD]]}}
 | periarg = 301.1
 | k1 = 4.4
}}
{{Starbox detail
 | source = 
 | mass = 
 | radius = 
 | luminosity = 118<ref name=Mcdonald2012/>
 | temperature = 5,101<ref name=Mcdonald2012/>
 | gravity = 
 | metal_fe = 
 | rotational_velocity = 
 | age_myr = 
}}
{{Starbox catalog
 | names = Nahn, {{odlist | B=ξ Cnc | F=77&nbsp;Cancri | FK5=1239 | BD=+22° 2061 | HD=78515 | HIP=44946 | HR=3627 | SAO=80666 }}<ref name=SIMBAD/>
}}
{{Starbox reference
 | Simbad = ksi+Cnc
}}
{{starbox end}}
'''Xi Cancri''' ('''ξ Cancri''', abbreviated '''Xi Cnc''', '''ξ Cnc''') is a [[Astronomy:Spectroscopic binary|spectroscopic binary]] [[Astronomy:Star system|star system]] in the [[Astronomy:Zodiac|zodiac]] [[Astronomy:Constellation|constellation]] of [[Astronomy:Cancer (constellation)|Cancer]]. It is visible to the naked eye with an [[Astronomy:Apparent visual magnitude|apparent visual magnitude]] of +5.15.<ref name=Sturch1972/> Based upon [[Astronomy:Stellar parallax|parallax]] measurements obtained during the ''[[Astronomy:Hipparcos|Hipparcos]]'' mission,<ref name=vanLeeuwen2007/> it is roughly 370&nbsp;[[Astronomy:Light-year|light-year]]s distant from the [[Astronomy:Sun|Sun]].

The two components are designated Xi Cancri A (formally named '''Nahn''' {{IPAc-en|'|n|ɑː|n}}<!--per all words in the OED that end in <ahn>-->)<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=18 June 2018}}</ref> and B.

== Nomenclature ==

''ξ Cancri'' ([[Social:Latinisation of names|Latinised]] to ''Xi Cancri'') is the system's [[Astronomy:Bayer designation|Bayer designation]]. The designations of the two components as ''Xi Cancri A'' and ''B'' derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple [[Astronomy:Star system|star system]]s, and adopted by the [[Organization:International Astronomical Union|International Astronomical Union]] (IAU).<ref name="planetnaming">{{cite arXiv |title=On the naming convention used for multiple star systems and extrasolar planets |date=2010 |eprint=1012.0707 |class=astro-ph.SR |last1= Hessman |first1=F. V. |last2= Dhillon |first2=V. S. |last3= Winget |first3=D. E. |last4= Schreiber |first4=M. R. |last5= Horne |first5=K. |last6= Marsh |first6=T. R. |last7= Guenther |first7=E. |last8= Schwope |first8=A. |last9= Heber |first9=U. }}</ref>

Xi Cancri together with [[Astronomy:Lambda Leonis|Lambda Leonis]] (Alterf) were the Persian ''Nahn'', "the Nose", and the [[Religion:Copts|Coptic]] ''Piautos'', "the Eye", both lunar [[Astronomy:Asterism|asterisms]].<ref name=Allen1963/> ''Nahn'' was also the name given to Xi&nbsp;Cancri in a 1971 [[Organization:NASA|NASA]] technical memorandum.<ref name=Rhoads1971/> In 2016, the IAU organized a Working Group on Star Names (WGSN)<ref name="WGSN">{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|access-date=22 May 2016}}</ref> to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire [[Astronomy:Star system|multiple systems]].<ref name="TriRpt18">{{cite web | url=https://www.iau.org/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf | page=5 | title=WG Triennial Report (2015–2018) – Star Names |access-date=2018-07-14}}</ref> It approved the name ''Nahn'' for the component Xi Cancri A on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>

== Properties ==

At its present distance, the visual magnitude is diminished by an [[Astronomy:Extinction|extinction factor]] of 0.135 due to interstellar dust.<ref name=Malkov2012/> 

Xi Cancri is a single-lined [[Astronomy:Spectroscopic binary|spectroscopic binary]] star system with an [[Astronomy:Orbital period|orbital period]] of 4.66 years, an [[Astronomy:Orbital eccentricity|eccentricity]] of 0.06, and a semimajor axis of 0.01&nbsp;[[Arcsecond|arcsecond]]. The primary, Xi Cancri A, is a yellow G-type [[Astronomy:Giant star|giant]] with an [[Astronomy:Apparent magnitude|apparent magnitude]] of +5.70. Its companion, Xi Cancri B, is of magnitude 6.20.<ref name=Malkov2012/>

==References==
{{reflist|refs=

<ref name=vanLeeuwen2007>{{citation
 | title=Validation of the new Hipparcos reduction
 | last1=van Leeuwen | first1=F.
 | journal=Astronomy and Astrophysics
 | volume=474 | issue=2 | pages=653–664 | date=2007
 | arxiv=0708.1752 | bibcode=2007A&A...474..653V
 | doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref>

<ref name=Anderson2012>{{citation
 | title=XHIP: An extended hipparcos compilation
 | last1=Anderson | first1=E. | last2=Francis | first2=Ch.
 | journal=Astronomy Letters
 | volume=38 | issue=5 | pages=331 | year=2012
 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
 | arxiv=1108.4971 | s2cid=119257644 | postscript=. }}</ref>

<ref name=Mcdonald2012>{{citation
 | display-authors=1 | last1=McDonald | first1=I.
 | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L.
 | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars
 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=427 | issue=1 | pages=343–57 | date=2012
 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037
 | doi=10.1111/j.1365-2966.2012.21873.x | s2cid=118665352 | postscript=. }}</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=Sturch1972>{{citation
 | title=UBVRI photometry of north galactic pole K giants. II
 | last1=Sturch | first1=C. R. | last2=Helfer | first2=H. L.
 | journal=Astronomical Journal | postscript=.
 | volume=77 | page=726 | date=November 1972
 | doi=10.1086/111344 | bibcode=1972AJ.....77..726S }}</ref>

<ref name=Malkov2012>{{citation
 | last1=Malkov | first1=O. Yu. | last2=Tamazian | first2=V. S.
 | last3=Docobo | first3=J. A. | last4=Chulkov | first4=D. A.
 | title=Dynamical masses of a selected sample of orbital binaries
 | journal=Astronomy & Astrophysics | display-authors=1
 | volume=546 | pages=A69 | year=2012 | postscript=.
 | bibcode=2012A&A...546A..69M | doi=10.1051/0004-6361/201219774 | doi-access=free }}</ref>

<ref name=Pourbaix2004>{{citation
 | title=S<sub>B<sup>9</sup></sub>: The ninth catalogue of spectroscopic binary orbits
 | journal=Astronomy & Astrophysics
 | display-authors=1 | last1=Pourbaix | first1=D.
 | last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H.
 | last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I.
 | last6=Levato | first6=H. | last7=Morrell | first7=N. I.
 | last8=Torres | first8=G. | last9=Udry | first9=S.
 | volume=424 | issue=2 | pages=727–732 | date=2004
 | doi=10.1051/0004-6361:20041213 | bibcode=2004A&A...424..727P
 | arxiv=astro-ph/0406573 | s2cid=119387088
 | postscript=. }}</ref>

<ref name=Allen1963>{{citation | last=Allen | first=R. H. | date=1963 |  title=Star Names: Their Lore and Meaning | url=https://archive.org/details/starnamestheirlo00alle/page/114 | access-date=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc. | postscript=. | location=New York, NY | isbn=0-486-21079-0 | page=[https://archive.org/details/starnamestheirlo00alle/page/114 114] | url-access=registration }}</ref>

<ref name=Jackson1957>{{citation
 | display-authors=1 | last1=Jackson | first1=E. S.
 | last2=Shane | first2=W. W. | last3=Lynds | first3=Beverly T.
 | title=The Orbits of the Spectroscopic Binaries Omicron Tauri, Xi Cancri, and Mu Ursae Majories
 | journal=Astrophysical Journal | postscript=.
 | volume=125 | page=712 | date=May 1957
 | doi=10.1086/146345 | bibcode=1957ApJ...125..712J }}</ref>

<ref name=Rhoads1971>{{citation
 | url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf
 | first1=Jack W. | last1=Rhoads
 | title=Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars
 | publisher=Jet Propulsion Laboratory, California Institute of Technology
 | date=November 15, 1971 | postscript=. }}</ref>

<ref name=SIMBAD>{{cite simbad
 | title=ksi Cnc
 | access-date=2017-06-15 }}</ref>

}}

{{Stars of Cancer|state=collapsed}}

{{DEFAULTSORT:Xi Cancri}}
[[Category:G-type giants]]
[[Category:Spectroscopic binaries]]
[[Category:Bayer objects|Cancri, Xi]]
[[Category:Cancer (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Flamsteed objects|Cancri, 77]]
[[Category:Henry Draper Catalogue objects|078515]]
[[Category:Hipparcos objects|044946]]
[[Category:Bright Star Catalogue objects|3627]]

{{Sourceattribution|Xi Cancri}}