What is Pismis 24-1?
{{Starbox begin|name=Pismis 24-1}} {{Starbox image|image=[[Image:Pismis 24.jpg|280px]]|caption=Pismis 24-1 is the brightest region of light at the centre of this optical image of the [[NGC 6357]] region.|credit=ESO/IDA/Danish 1.5 m/ R. Gendler, U.G. Jørgensen, J. Skottfelt, K. Harpsøe}} {{Starbox character|component=NE|class=O3.5If*<ref name=maiz/>|b-v=|u-b=|variable=[[Eclipsing binary|eclipsing]]<ref name=barr/>}} {{Starbox character|no_heading=y|component=SW|class=O4III(f<sup>+</sup>)<ref name=maiz/>|b-v=|u-b=|variable=}} {{Starbox astrometry|radial_v=−2.0<ref>{{cite journal|bibcode=1972MNRAS.158...85C|title=Radial velocities of southern B stars determined at the Radcliffe Observatory - VI. Stars in H II regions|journal=Monthly Notices of the Royal Astronomical Society|volume=158|pages=85–98|last1=Crampton|first1=D.|year=1972|doi=10.1093/mnras/158.1.85|doi-access=free}}</ref>|prop_mo_ra=−0.1<ref name=tycho2>{{cite journal|bibcode=2000A&A...355L..27H|title=The Tycho-2 catalogue of the 2.5 million brightest stars|journal=Astronomy and Astrophysics|volume=355|pages=L27|last1=Høg|first1=E.|last2=Fabricius|first2=C.|last3=Makarov|first3=V. V.|last4=Urban|first4=S.|last5=Corbin|first5=T.|last6=Wycoff|first6=G.|last7=Bastian|first7=U.|last8=Schwekendiek|first8=P.|last9=Wicenec|first9=A.|year=2000|doi=10.1888/0333750888/2862}}</ref>|prop_mo_dec=−1.3<ref name=tycho2/>|parallax=|p_error=|parallax_footnote=|dist_ly=6,500<ref name=lima>{{cite journal|arxiv=1406.2413|bibcode=2014A&A...568A..16L|title=Probing embedded star clusters in the HII complex NGC 6357 with VVV|journal=Astronomy & Astrophysics|volume=568|pages=A16|last1=Lima|first1=E. F.|last2=Bica|first2=E.|last3=Bonatto|first3=C.|last4=Saito|first4=R. K.|year=2014|doi=10.1051/0004-6361/201323050|s2cid=56229887}}</ref>|dist_pc=2,000<ref name=lima/>|absmag_v=−7.50<ref name=maiz>{{cite journal|arxiv=astro-ph/0612012|bibcode=2007ApJ...660.1480M|title=Pismis 24-1: The Stellar Upper Mass Limit Preserved|journal=The Astrophysical Journal|volume=660|issue=2|pages=1480–1485|