Lambda Cancri: Difference between revisions

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imported>Lithopsian
extra space in BD designation
 
imported>Praemonitus
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{{Starbox image
{{Starbox image
  | image=
  | image =  
{{Location mark
{{Location mark
|image= Cancer IAU.svg|alt=|float=center|width=260
|image= Cancer IAU.svg|alt=|float=center|width=260
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|x=550|y=370
|x=550|y=370
}}
}}
| caption = Location of Piautos (circled)
| caption = Location of Piautos (circled)
}}
}}
{{Starbox observe
{{Starbox observe
  | epoch = [[J2000.0]]
  | epoch       = [[J2000.0]]
  | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
  | equinox     = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
  | constell = [[Cancer (constellation)|Cancer]]
  | constell   = [[Cancer (constellation)|Cancer]]<ref name=Anderson2012/>
  | ra = {{RA|08|20|32.13630}}<ref name=vanLeeuwen2007/>
  | ra         = {{RA|08|20|32.13630}}<ref name=GaiaDR3/>
  | dec = {{DEC|+24|01|20.3198}}<ref name=vanLeeuwen2007/>
  | dec         = {{DEC|+24|01|20.3198}}<ref name=GaiaDR3/>
  | appmag_v = +5.93<ref name=Gullikson2016/>
  | appmag_v   = +5.93<ref name=Gullikson2016/>
}}
}}
{{Starbox character
{{Starbox character
  | class = B9.5&nbsp;V<ref name=Cowley1969/><ref name=Gullikson2016/>
  | class       = B9.5&nbsp;V<ref name=Cowley1969/><ref name=Gullikson2016/>
  | b-v =  
  | b-v         = −0.039{{±|0.004}}<ref name=Anderson2012/>
  | u-b =  
  | u-b         =  
  | r-i =  
  | r-i         =  
  | variable =  
  | variable   = Constant<ref name=Anderson2012/>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
  | radial_v = {{Val|+23.0|4.3}}<ref name=deBruijne2012/>
  | radial_v   = {{Val|+23.0|4.3}}<ref name=deBruijne2012/>
  | prop_mo_ra = −20.29<ref name=vanLeeuwen2007/>
  | prop_mo_ra = −20.843
  | prop_mo_dec = −18.81<ref name=vanLeeuwen2007/>
  | prop_mo_dec = −18.970
  | parallax = 5.9490
| pm_footnote = <ref name=GaiaDR3/>
  | p_error = 0.1482
  | parallax   = 5.7362
  | parallax_footnote = <ref name=dr2/>
  | p_error     = 0.0582
  | absmag_v = +0.19<ref name=Anderson2012/>
  | parallax_footnote = <ref name=GaiaDR3/>
  | absmag_v   = +0.19<ref name=Anderson2012/>
}}
}}
{{Starbox detail
{{Starbox detail
  | source = <ref name=Gullikson2016/>
  | source     = <ref name=Gullikson2016/>
  | component1 = λ Cnc A
  | component1 = λ Cnc A
  | mass = {{Val|2.1|0.39|0.32}}
  | mass       = 2.61{{±|0.35}}<ref name=Stassun_et_al_2019/>
| radius =  
| radius      = 3.69{{±|0.13}}<ref name=Stassun_et_al_2019/>
  | luminosity = 78<ref name=Mcdonald2012/>
  | luminosity = 131{{±|9}}<ref name=Stassun_et_al_2019/>
  | temperature = {{Val|9500|1000|fmt=commas}}
  | temperature = 10,162{{±|123}}<ref name=Stassun_et_al_2019/>
  | gravity = {{Val|4.0|0.25}}
  | gravity     = 3.72{{±|0.06}}<ref name=Stassun_et_al_2019/>
  | metal_fe =  
  | metal_fe   =  
  | rotational_velocity = 188<ref name=Royer2007/>
  | rotational_velocity = 188<ref name=Royer2007/>
  | age_myr = {{Val|105|287|93}}
  | age_myr     = {{Val|105|287|93}}
  | component2 = λ Cnc B
  | component2 = λ Cnc B
  | mass2 = 0.8
  | mass2       = 0.8
  | temperature2 = {{Val|4562|154|fmt=commas}}
  | temperature2 = {{Val|4562|154|fmt=commas}}
  | rotational_velocity2 = 10
  | rotational_velocity2 = 10
| metal2_fe = −0.5
  | metal_fe2   = −0.5
  | metal_fe2 = −0.5
}}
}}
{{Starbox catalog
{{Starbox catalog
  | names = Piautos, {{odlist | B=λ Cnc | F=19&nbsp;Cancri | FK5= | BD=+24°1909 | HD=70011 | HIP=40881 | HR=3268 | SAO=80113 }}<ref name=SIMBAD/>
  | names = {{odlist | name=Piautos | B=λ Cnc | F=19&nbsp;Cancri | FK5= | BD=+24°1909 | HD=70011 | HIP=40881 | HR=3268 | SAO=80113 }}<ref name=SIMBAD/>
}}
}}
{{Starbox reference
{{Starbox reference
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}}
}}
{{starbox end}}
{{starbox end}}
'''Lambda Cancri''' ('''λ Cancri''', abbreviated '''Lambda Cnc''', '''λ Cnc''') is a blue-white-hued [[spectroscopic binary]] [[star]]<ref name=Gullikson2016/> in the [[zodiac]] [[constellation]] of [[Cancer (constellation)|Cancer]]. With a combined [[apparent visual magnitude]] of +5.93, it is faintly visible to the naked eye.<ref name=Gullikson2016/> Based upon [[stellar parallax|parallax]] measurements obtained during the [[Gaia (spacecraft)|Gaia]] mission, it is about 550&nbsp;[[light-year]]s distant from the [[Sun]].<ref name=dr2/>
'''Lambda Cancri''' is a blue-white-hued [[spectroscopic binary]] [[star]]<ref name=Gullikson2016/> in the [[zodiac]] [[constellation]] of [[Cancer (constellation)|Cancer]]. Its name is a [[Bayer designation]] that is [[Romanization of Greek|Latinized]] from '''λ Cancri''', and abbreviated '''Lambda Cnc''' or '''λ Cnc'''. With a combined [[apparent visual magnitude]] of +5.93, it is faintly visible to the [[naked eye]].<ref name=Gullikson2016/> Based upon [[stellar parallax|parallax]] measurements obtained during the [[Gaia (spacecraft)|Gaia]] mission, it is approximately {{convert|569|ly|pc|abbr=out|lk=on}} distant from the [[Sun]].<ref name=GaiaDR3/> The system is drifting further away with a line of sight velocity of around +23&nbsp;km/s.<ref name=deBruijne2012/>


The two components are designated Lambda Cancri A (formally named '''Piautos''' {{IPAc-en|p|i|'|ɔː|t|ɒ|s}})<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=18 June 2018}}</ref> and B.
The two components are designated Lambda Cancri A (formally named '''Piautos''' {{IPAc-en|p|i|'|ɔː|t|ɒ|s}})<ref name="IAU-LSN"/> and B. The position of this system near the [[ecliptic]] means it is subject to [[lunar occultation]].<ref name=Hilaire_1974/>


== Nomenclature ==
== Nomenclature ==


''λ Cancri'' ([[Latinisation of names|Latinised]] to ''Lambda Cancri'') is the binary's [[Bayer designation]]. The designations of the two components as ''Lambda Cancri A'' and ''B'' derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple [[star system]]s, and adopted by the [[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>
''λ Cancri'' ([[Latinisation of names|Latinised]] to ''Lambda Cancri'') is the binary's [[Bayer designation]]. The designations of the two components as ''Lambda Cancri A'' and ''B'' derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple [[star system]]s, and adopted by the [[International Astronomical Union]] (IAU).<ref name="planetnaming"/>


The system occurs in the [[lunar station]] that was given the name πιαυτος ''piautos'' in a [[Copts|Coptic]] manuscript list of lunar stations, nearly all of which were in "debased" [[Greek language|Greek]]. [[Walter Ewing Crum|Walter Crum]] was of the opinion that ''Piautos'' is formed from the Greek word ''autos'' "self" and the [[Coptic language|Coptic]] determiner ''pi-'' "that", which is automatically tacked onto Greek nouns. The combination would (in Greek) mean "the same, the very one". Given that the [[Ancient Greece|Greeks]] are not known to have used lunar stations, the origin of the names is unknown.<ref name=Weinstock>See station 10 in footnote 12 in Stefan Weinstock, "Lunar Mansions and Early Calendars", ''Journal of Hellenic Studies'',  Volume 69, November 1949, pp. 48-69.</ref>
The system occurs in the [[lunar station]] that was given the name πιαυτος ''piautos'' in a [[Copts|Coptic]] manuscript list of lunar stations, nearly all of which were in "debased" [[Greek language|Greek]]. [[Walter Ewing Crum|Walter Crum]] was of the opinion that ''Piautos'' is formed from the Greek word ''autos'' "self" and the [[Coptic language|Coptic]] determiner ''pi-'' "that", which is automatically tacked onto Greek nouns. The combination would (in Greek) mean "the same, the very one". Given that the [[Ancient Greece|Greeks]] are not known to have used lunar stations, the origin of the names is unknown.<ref name=Weinstock>See station 10 in footnote 12 in Stefan Weinstock, "Lunar Mansions and Early Calendars", ''Journal of Hellenic Studies'',  Volume 69, November 1949, pp. 48-69.</ref>


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)|accessdate=22 May 2016}}</ref> to catalog and standardize proper names for stars. The WGSN approved the name ''Piautos'' for Lambda Cancri on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/> The WGSN had previously stated that where a component letter (from e.g. [[Washington Double Star Catalog]]) is not explicitly listed, that the name should be understood to be attributed to the brightest component by visual brightness<ref name="WGSN2">{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin2.pdf | title=Bulletin of the IAU Working Group on Star Names, No. 2 |accessdate=12 October 2016}}</ref> (Lambda Cancri A in this case).
In 2016, the IAU organized a [[Working Group on Star Names]] (WGSN)<ref name="WGSN"/> to catalog and standardize proper names for stars. The WGSN approved the name ''Piautos'' for Lambda Cancri on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/> The WGSN had previously stated that where a component letter (from e.g. [[Washington Double Star Catalog]]) is not explicitly listed, that the name should be understood to be attributed to the brightest component by visual brightness<ref name="WGSN2"/> (Lambda Cancri A in this case).


In [[Chinese language|Chinese]], {{lang|zh|爟}} ({{lang|zh-Latn|Guàn}}), meaning ''[[Ghost (Chinese constellation)|Beacon Fire]]'', refers to an [[Asterism (astronomy)|asterism]] consisting of Lambda Cancri and [[Psi Cancri|Psi]], [[Phi1 Cancri|Phi<sup>1</sup>]] and [[15 Cancri]].<ref>{{in lang|zh}} ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}.</ref> Consequently, Lambda Cancri itself is known as {{lang|zh|爟二}} ({{lang|zh-Latn|Guàn èr}}, {{langx|en|the Second Star of Beacon Fire}}).<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0605/ap060527.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 27 日] {{Webarchive|url=https://web.archive.org/web/20110522115821/http://aeea.nmns.edu.tw/2006/0605/ap060527.html |date=2011-05-22 }}</ref> From this Chinese name, the name ''Kwan Wei'' meaning "the bright fire" was given.<ref name=Allen1963/>
In [[Chinese language|Chinese]], {{lang|zh|爟}} ({{lang|zh-Latn|Guàn}}), meaning ''[[Ghost (Chinese constellation)|Beacon Fire]]'', refers to an [[Asterism (astronomy)|asterism]] consisting of Lambda Cancri and [[Psi Cancri|Psi]], [[Phi1 Cancri|Phi<sup>1</sup>]] and [[15 Cancri]].<ref>{{in lang|zh}} ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}.</ref> Consequently, Lambda Cancri itself is known as {{lang|zh|爟二}} ({{lang|zh-Latn|Guàn èr}}, {{langx|en|the Second Star of Beacon Fire}}).<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0605/ap060527.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 27 日] {{Webarchive|url=https://web.archive.org/web/20110522115821/http://aeea.nmns.edu.tw/2006/0605/ap060527.html |date=2011-05-22 }}</ref> From this Chinese name, the name ''Kwan Wei'' meaning "the bright fire" was given.<ref name=Allen1963/>
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== Properties ==
== Properties ==


The primary, Lambda Cancri A, is a [[B-type main-sequence star]] with a [[stellar classification]] of B9.5&nbsp;V.<ref name=Cowley1969/> It has 2.1<ref name=Gullikson2016/> times the [[mass of the Sun]] and radiates 78<ref name=Mcdonald2012/> times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of roughly {{val|9500|ul=K|fmt=commas}}.<ref name=Gullikson2016/> Its close companion, Lambda Cancri B, has 80% of the mass of the Sun.<ref name=Gullikson2016/>
The binary nature of this system was announced by K. Gullikson and associates in 2016.<ref name=Gullikson2016/> The primary, Lambda Cancri A, is a [[B-type main-sequence star]] with a [[stellar classification]] of B9.5&nbsp;V.<ref name=Cowley1969/> This star is roughly 105<ref name=Gullikson2016/>&nbsp;million years old and is spinning rapidly with a [[projected rotational velocity]] of 188&nbsp;km/s.<ref name=Royer2007/> It has 2.6 times the [[mass of the Sun]] and 3.7 times the [[Sun's radius]]. The star radiates 131 times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of roughly {{val|10162|ul=K|fmt=commas}}.<ref name=Stassun_et_al_2019/> Its close companion, Lambda Cancri B, has 80% of the mass of the Sun.<ref name=Gullikson2016/>


==References==
==References==
{{reflist|refs=
{{reflist|refs=


<ref name=vanLeeuwen2007>{{citation
<ref name=GaiaDR3>{{Cite Gaia DR3
  | title=Validation of the new Hipparcos reduction
  | 5338229115839425664 | mode=cs2 | postscript. | access-date=2025-06-23}}</ref>
| 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
<ref name=Anderson2012>{{Cite XHIP
| title=XHIP: An extended hipparcos compilation
  | 40881 |mode=cs2 | postscript. | access-date=2025-06-23}}</ref>
  | 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=deBruijne2012>{{citation
<ref name=deBruijne2012>{{citation
Line 106: Line 96:
  | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D  
  | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D  
  | arxiv=1208.3048 | s2cid=59451347 | postscript=. }}</ref>
  | arxiv=1208.3048 | s2cid=59451347 | 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 | doi-access=free | s2cid=118665352 | postscript=. }}</ref>


<ref name=Gullikson2016>{{citation
<ref name=Gullikson2016>{{citation
Line 122: Line 103:
  | journal=The Astronomical Journal | postscript=.
  | journal=The Astronomical Journal | postscript=.
  | volume=152 | issue=2 | id=40 | pages=13 | date=August 2016
  | volume=152 | issue=2 | id=40 | pages=13 | date=August 2016
  | doi=10.3847/0004-6256/152/2/40 | bibcode=2016AJ....152...40G |arxiv = 1604.06456 | s2cid=119179065 | doi-access=free }}</ref>
  | doi=10.3847/0004-6256/152/2/40 | bibcode=2016AJ....152...40G
| arxiv=1604.06456 | s2cid=119179065 | doi-access=free }}</ref>


<ref name=Cowley1969>{{citation | display-authors=1
<ref name=Cowley1969>{{citation | display-authors=1
Line 145: Line 127:
  | accessdate=2017-06-18 | postscript=. }}</ref>
  | accessdate=2017-06-18 | postscript=. }}</ref>


<ref name=Allen1963>{{citation | last=Allen | first=R. H. | date=1963 | author-link=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | url=https://archive.org/details/starnamestheirlo00alle/page/114 | accessdate=2018-06-29 | 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=Allen1963>{{citation | postscript=.
| last=Allen | first=R. H.
| author-link=Richard Hinckley Allen
| title=Star Names: Their Lore and Meaning
| page=114 | date=1963 | edition=Reprint
| publisher=Dover Publications Inc.
| location=New York, NY | isbn=((0-486-21079-0))
| url=https://archive.org/details/starnamestheirlo00alle/page/114
| accessdate=2018-06-29 | url-access=registration }}</ref>
 
<ref name="planetnaming">{{cite arXiv
| title=On the naming convention used for multiple star systems and extrasolar planets
| display-authors=1 | 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.
| year=2010 | eprint=1012.0707 | class=astro-ph.SR }}</ref>


<<ref name=dr2>{{cite DR2}}</ref>
<ref name="WGSN2">{{citation | postscript=.
| title=Bulletin of the IAU Working Group on Star Names, No. 2
| publisher=International Astronomical Union
| url=http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin2.pdf
| accessdate=12 October 2016 }}</ref>
 
<ref name="WGSN">{{citation | postscript=.
| title=IAU Working Group on Star Names (WGSN)
| publisher=International Astronomical Union
| url=https://www.iau.org/science/scientific_bodies/working_groups/280/
| accessdate=22 May 2016 }}</ref>
 
<ref name="IAU-LSN">{{citation | postscript=.
| url=https://www.iau.org/public/themes/naming_stars/
| title=Naming Stars
| publisher=IAU.org
| accessdate=18 June 2018}}</ref>
 
<ref name=Hilaire_1974>{{citation | postscript=.
| title=Observations d'occultations d'etoiles par la lune
| last=Hilaire | first=G. | language=fr
| journal=Astronomy and Astrophysics Supplement
| volume=13 | pages=395 | date=March 1974
| bibcode=1974A&AS...13..395H }} See SAO 80113 on p. 396.</ref>
 
<ref name=Stassun_et_al_2019>{{citation | postscript=.
| title=The revised TESS Input Catalog and Candidate Target List
| last=Stassun | first=K. G. | display-authors=etal
| journal=[[The Astronomical Journal]]
| volume=158 | issue=4 | page=138 | date=October 2019
| arxiv=1905.10694 | bibcode=2019AJ....158..138S
| doi=10.3847/1538-3881/ab3467 | doi-access=free
| s2cid=166227927 }}</ref>


}}
}}
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{{DEFAULTSORT:Lambda Cancri}}
{{DEFAULTSORT:Lambda Cancri}}
[[Category:B-type main-sequence stars]]
[[Category:B-type main-sequence stars]]
[[Category:Spectroscopic binaries]]
[[Category:Cancer (constellation)]]
[[Category:Bayer objects|Cancri, Lambda]]
[[Category:Bayer objects|Cancri, Lambda]]
[[Category:Cancer (constellation)]]
[[Category:Bright Star Catalogue objects|3268]]
[[Category:Durchmusterung objects|BD+24 1909]]
[[Category:Durchmusterung objects|BD+24 1909]]
[[Category:Flamsteed objects|Cancri, 19]]
[[Category:Flamsteed objects|Cancri, 19]]
[[Category:Henry Draper Catalogue objects|070011]]
[[Category:Henry Draper Catalogue objects|070011]]
[[Category:Hipparcos objects|040881]]
[[Category:Hipparcos objects|040881]]
[[Category:Bright Star Catalogue objects|3268]]
[[Category:Spectroscopic binaries]]
[[Category:Stars with proper names|Piautos]]
[[Category:Stars with proper names|Piautos]]

Latest revision as of 05:10, 24 June 2025

Template:Short description

Lambda Cancri
Template:Location mark
Location of Piautos (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +5.93[3]
Characteristics
Spectral type B9.5 V[4][3]
B−V Template:Engvar −0.039±0.004[1]
Variable type Constant[1]
Astrometry
Radial velocity (Rv)Template:Val[5] km/s
Proper motion (μ) RA: −20.843 mas/yr[2]
Dec.: −18.970 mas/yr[2]
Parallax (π)5.7362±0.0582 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.19[1]
Details[3]
λ Cnc A
Mass2.61±0.35[6] Template:Solar mass
Radius3.69±0.13[6] Template:Solar radius
Luminosity131±9[6] Template:Solar luminosity
Surface gravity (log g)3.72±0.06[6] cgs
Temperature10,162±123[6] K
Rotational velocity (v sin i)188[7] km/s
AgeTemplate:Val Myr
λ Cnc B
Mass0.8 Template:Solar mass
TemperatureTemplate:Val K
Metallicity [Fe/H]−0.5 dex
Rotational velocity (v sin i)10 km/s
Other designations
Template:Odlist[8]
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

Lambda Cancri is a blue-white-hued spectroscopic binary star[3] in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinized from λ Cancri, and abbreviated Lambda Cnc or λ Cnc. With a combined apparent visual magnitude of +5.93, it is faintly visible to the naked eye.[3] Based upon parallax measurements obtained during the Gaia mission, it is approximately Template:Convert distant from the Sun.[2] The system is drifting further away with a line of sight velocity of around +23 km/s.[5]

The two components are designated Lambda Cancri A (formally named Piautos Template:IPAc-en)[9] and B. The position of this system near the ecliptic means it is subject to lunar occultation.[10]

Nomenclature

λ Cancri (Latinised to Lambda Cancri) is the binary's Bayer designation. The designations of the two components as Lambda Cancri A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[11]

The system occurs in the lunar station that was given the name πιαυτος piautos in a Coptic manuscript list of lunar stations, nearly all of which were in "debased" Greek. Walter Crum was of the opinion that Piautos is formed from the Greek word autos "self" and the Coptic determiner pi- "that", which is automatically tacked onto Greek nouns. The combination would (in Greek) mean "the same, the very one". Given that the Greeks are not known to have used lunar stations, the origin of the names is unknown.[12]

In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN approved the name Piautos for Lambda Cancri on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[9] The WGSN had previously stated that where a component letter (from e.g. Washington Double Star Catalog) is not explicitly listed, that the name should be understood to be attributed to the brightest component by visual brightness[14] (Lambda Cancri A in this case).

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Beacon Fire, refers to an asterism consisting of Lambda Cancri and Psi, Phi1 and 15 Cancri.[15] Consequently, Lambda Cancri itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[16] From this Chinese name, the name Kwan Wei meaning "the bright fire" was given.[17]

Properties

The binary nature of this system was announced by K. Gullikson and associates in 2016.[3] The primary, Lambda Cancri A, is a B-type main-sequence star with a stellar classification of B9.5 V.[4] This star is roughly 105[3] million years old and is spinning rapidly with a projected rotational velocity of 188 km/s.[7] It has 2.6 times the mass of the Sun and 3.7 times the Sun's radius. The star radiates 131 times the Sun's luminosity from its photosphere at an effective temperature of roughly Template:Val.[6] Its close companion, Lambda Cancri B, has 80% of the mass of the Sun.[3]

References

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  1. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  2. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3
  3. ↑ a b c d e f g h Cite error: Invalid <ref> tag; no text was provided for refs named Gullikson2016
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Cowley1969
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named deBruijne2012
  6. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Stassun_et_al_2019
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Royer2007
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named IAU-LSN
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Hilaire_1974
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named planetnaming
  12. ↑ See station 10 in footnote 12 in Stefan Weinstock, "Lunar Mansions and Early Calendars", Journal of Hellenic Studies, Volume 69, November 1949, pp. 48-69.
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WGSN
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WGSN2
  15. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  16. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 27 日 Template:Webarchive
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Allen1963
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