Editing Coma Berenices (section)

==== Supernovae ====
A number of [[supernova]]e have been discovered in Coma Berenices. Four ([[SN 1940B]], [[SN 1969H]], [[SN 1987E]] and [[SN 1999gs]]) were in the [[NGC 4725]] galaxy,<ref name="iau">{{cite web | url =http://www.cbat.eps.harvard.edu/lists/Supernovae.html |title=List of Supernovae|publisher=IAU Central Bureau for Astronomical Telegrams| access-date =6 November 2016}}</ref> and another four were discovered in the [[Messier 99|M99]] galaxy (NGC 4254): [[SN 1967H]], [[SN 1972Q]], [[SN 1986I]] and [[SN 2014L]].<ref name="iau"/> Five were discovered in the [[Messier 100|M100]] galaxy (NGC 4321): [[SN 1901B]], [[SN 1914A]], [[SN 1959E]], [[SN 1979C]] and [[SN 2006X]].<ref name="iau"/> SN 1940B, discovered on 5 May 1940, was the first observed [[type II supernova]].<ref>{{cite book | editor=Albert G. Petschek| title =Supernovae| publisher =Springer Science & Business Media| year =2012| page =60| isbn =978-1-4612-3286-5}}</ref> [[SN 2005ap]], discovered on 3 March 2005, is the second-brightest-known supernova to date with a peak [[absolute magnitude]] of about −22.7.<ref>{{Cite journal|title=SN 2005ap: A Most Brilliant Explosion|journal=The Astrophysical Journal|volume=668|issue=2|pages=L99–L102|author1=Robert M. Quimby |author2=Greg Aldering |author3=J. Craig Wheeler |author4=Peter Höflich |author5=Carl W. Akerlof |author6=Eli S. Rykoff| date=3 September 2007|doi= 10.1086/522862|arxiv = 0709.0302 |bibcode = 2007ApJ...668L..99Q |s2cid=18897235}}</ref> Due to its great distance from Earth (4.7 billion light-years), it was not visible to the naked eye and was discovered telescopically. SN&nbsp;1979C, discovered in 1979, retained its original [[X-ray]] brightness for 25 years despite fading in visible light.<ref>{{cite web | url =http://www.esa.int/Our_Activities/Space_Science/The_supernova_that_just_won_t_fade_away|title=The supernova that just won't fade away|publisher=[[ESA]]| date=21 July 2005| access-date =25 November 2016}}</ref>