Messier 95
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Messier 95, also known as M95 or NGC 3351, is a barred spiral galaxy about 33 million light-years away in the zodiac constellation Leo. It was discovered by Pierre Méchain in 1781, and catalogued by compatriot Charles Messier four days later. In 2012 its most recent supernova was discovered.
The galaxy has a morphological classification of SB(r)b,<ref name="ned" /> with the SBb notation indicating it is a barred spiral with arms that are intermediate on the scale from tightly to loosely wound, and an "(r)" meaning an inner ring surrounds the bar.<ref name=Buta2007>Template:Citation</ref> The latter is a ring-shaped, circumnuclear star-forming region with a diameter of approximately Template:Convert.<ref>Template:Cite journal</ref> The spiral structure extends outward from the ring.<ref name=Buta2007/>
Its ring structure is about Template:Solar mass (solar masses) in molecular gas and yields a star formation rate of Template:Solar mass yr−1.Template:Efn The star formation is occurring in at least five regions with diameters between 100 and 150 pc that are composed of several star clusters ranging in size from 1.7 to 4.9 pc. These individual clusters contain Template:ValTemplate:Efn of stars, and may be on the path to forming globular clusters.<ref name=Haegele2007>Template:Citation</ref>
A Type II supernova, designated as SN 2012aw, was discovered in M95 in 2012.Template:Efn<ref name=DeepSkyVideos>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=BadAstronomyM95>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="IAU Central Bureau for Astronomical Telegrams">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The light curve of this displayed great flattening after 27 days, thus classifying it as a Type II-P, or "plateau", core-collapse supernova.<ref name=Bayless2013>Template:Citation</ref> The disappearance of the progenitor star was later confirmed from near-infrared imaging of the region. The brightness from the presumed red supergiant progenitor allowed its mass to be estimated as Template:Val.<ref name=Morgan2016>Template:Citation</ref>
M95 is one of several galaxies within the M96 Group, a group of galaxies in the constellation Leo, the other Messier objects of which are M96 and M105.<ref name="nbg">Template:Cite book</ref><ref name="fouqueetal1992">Template:Cite journal</ref><ref name="garcia1993">Template:Cite journal</ref><ref name="giuricinetal2002">Template:Cite journal</ref>
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- SEDS: Spiral Galaxy M95
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