View source for G0.238-0.071

'''G0.238-0.071''', also known as '''[DWC2011] 56''' or '''[MCD2010] 18''',<ref name=SIMBAD/> is a [[Wolf-Rayet Star]]<ref name=CMZ/> in the [[constellation]] of [[Sagittarius (constellation)|Sagittarius]]. It is located near the [[Galactic Center]],<ref name=dong2011>{{cite journal |last1=Dong |first1=H. |last2=Wang |first2=Q. D. |last3=Cotera |first3=A. |last4=Stolovy |first4=S. |last5=Morris |first5=M. R. |last6=Mauerhan |first6=J. |last7=Mills |first7=E. A. |last8=Schneider |first8=G. |last9=Calzetti |first9=D. |last10=Lang |first10=C. |title=Hubble Space Telescope Paschen α survey of the Galactic Centre: Data reduction and products |journal=Monthly Notices of the Royal Astronomical Society |date=2011 |volume=417 |issue=1 |page=114 |doi=10.1111/j.1365-2966.2011.19013.x |doi-access=free |arxiv=1105.1703 |bibcode=2011MNRAS.417..114D }}</ref> around 25,000 light years from [[Earth]].<ref name="GRAVITY">{{cite journal |author=R. Abuter |author2=A. Amorim |author3=M. Bauböck |author4=J. P. Berger |author5=H. Bonnet |author6=W. Brandner |author7=Y. Clénet |author8=V. Coudé du Foresto |author9=P. T. de Zeeuw |author10=J. Dexter |author11=G. Duvert |author12=A. Eckart |author13=F. Eisenhauer |author14=N. M. Förster Schreiber |author15=P. Garcia |author16=F. Gao |author17=E. Gendron |author18=R. Genzel |author19=O. Gerhard |author20=S. Gillessen |author21=M. Habibi |author22=X. Haubois |author23=T. Henning |author24=S. Hippler |author25=M. Horrobin |author26=A. Jiménez-Rosales |author27=L. Jocou |author28=P. Kervella |author29=S. Lacour |author30=V. Lapeyrère |author31=J.-B. Le Bouquin |author32=P. Léna |author33=T. Ott |author34=T. Paumard |author35=K. Perraut |author36=G. Perrin |author37=O. Pfuhl |author38=S. Rabien |author39=G. Rodriguez Coira |author40=G. Rousset |author41=S. Scheithauer |author42=A. Sternberg |author43=O. Straub |author44=C. Straubmeier |author45=E. Sturm |author46=L. J. Tacconi |author47=F. Vincent |author48=S. von Fellenberg |author49=I. Waisberg |author50=F. Widmann |author51=E. Wieprecht |author52=E. Wiezorrek |author53=J. Woillez |author54=S. Yazici |display-authors=6 |collaboration=The GRAVITY collaboration|date=April 2019|title=A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty|journal=Astronomy & Astrophysics|volume=625|page=L10|doi=10.1051/0004-6361/201935656|url=https://www.aanda.org/articles/aa/full_html/2019/05/aa35656-19/aa35656-19.html|arxiv=1904.05721|bibcode=2019A&A...625L..10G|s2cid=119190574}}</ref>

G0.238-0.071 is currently the most luminous star known in the [[Milky Way]], having around 5 million times the luminosity of the [[Sun]].<ref name=IsolatedWRGC/> This also makes it  among the [[List of most luminous stars|most luminous stars]] ever discovered. It has a spectral type of WN11h<ref name=CMZ/> with an [[effective temperature]] between 39,500 and 44,000 [[Kelvin|K]]<ref name=IsolatedWRGC/> which would give a radius between 39 and 48 times that of the [[Sun]].{{efn|name=radius1}} Its mass is unknown but WNh stars with similar properties to G0.238-0.071 are massive, usually well over 100 times the mass of the [[Sun]].<ref>{{cite journal |last1=Dong |first1=H. |last2=Wang |first2=Q. D. |last3=Morris |first3=M. R. |title=A multiwavelength study of evolved massive stars in the Galactic Centre |journal=Monthly Notices of the Royal Astronomical Society |date=2012 |volume=425 |issue=2 |page=884 |doi=10.1111/j.1365-2966.2012.21200.x |doi-access=free |arxiv=1204.6298 |bibcode=2012MNRAS.425..884D }}</ref>

== Notes ==
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{{efn | name=radius1 | Applying the [[Stefan-Boltzmann Law]] with a nominal [[sun|solar]] [[effective temperature]] of 5,772&nbsp;[[Kelvin|K]]: 
:<math>\sqrt{(5,772/39,500)^4 * 5,012,000} = 48\ R_\odot</math>
:<math>\sqrt{(5,772/44,000)^4 * 5,012,000} = 39\ R_\odot</math>
}}
}}

==References==
{{reflist}}

{{Stars of Sagittarius}}

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[[Category:Sagittarius (constellation)]]
[[Category:Wolf–Rayet stars]]

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