SN 1939C

{{Infobox supernova

| name = SN 1939C

| image =

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| host = Fireworks Galaxy (NGC 6946){{Citation |last1=Frommert |first1=Hartmut |last2=Kronberg |first2=Christine |date=9 March 2009 |url=http://messier.seds.org/xtra/ngc/n6946.html |title= NGC 6946 |accessdate=31 August 2011}}

| constellation = Cepheus

| ra = 20:34:23.0 {{cite journal|bibcode=1994AJ....108.1893S |title=X-Ray Emission from the Historical Supernovae in the Spiral Galaxy NGC 6946: SN 1980K and 1968D Recovered |last1=Schlegel |first1=E. M. |journal=The Astronomical Journal |date=1994 |volume=108 |page=1893 |doi=10.1086/117202}}

| dec = +60:09:37.3

| gal =

| discovery = 17 July 1939

| iauc =

| mag_v = 13.0

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}}

SN 1939C was a supernova in the Fireworks Galaxy discovered by Fritz Zwicky on 17 July 1939.{{cite web | url = http://www.cbat.eps.harvard.edu/IAUCs/IAUC0793.jpg | title = Circular No. 793 | last = Strömgren | first = Elis | date = 2 September 1939 | website = Central Bureau for Astronomical Telegrams | publisher = Observatory Copenhagen IAU | access-date = 19 December 2024}} With a right ascension of 20:34:23.0 and a declination of +60:09:37.3, it was 215"W and 24"N away from the center of the Fireworks Galaxy. It was found at magnitude 14.4, after it had peaked, and was estimated to have been as bright as magnitude 13.