Editing Supernova (section)

==Naming convention==
[[Image:Keplers supernova.jpg|thumb|Multi-wavelength [[X-ray]], [[infrared]], and [[optical]] compilation image of [[Johannes Kepler|Kepler's]] [[supernova remnant]], [[SN 1604]]]]Supernova discoveries are reported to the [[International Astronomical Union]]'s [[Central Bureau for Astronomical Telegrams]], which sends out a circular with the name it assigns to that supernova.<ref>{{Cite web |title=What Kinds of Discovered Objects to Report for IAUC Publication |url=http://www.cbat.eps.harvard.edu/WhatToReport.html |access-date=2023-03-08 |website=cbat.eps.harvard.edu}}</ref> The name is formed from the prefix ''SN'', followed by the year of discovery, suffixed with a one or two-letter designation. The first 26 supernovae of the year are designated with a capital letter from ''A'' to ''Z''. Next, pairs of lower-case letters are used: ''aa'', ''ab'', and so on. Hence, for example, ''SN 2003C'' designates the third supernova reported in the year 2003.<ref>{{cite journal
 |last1=Kirshner
 |first1=R. P.
 |year=1980
 |title=Type I supernovae: An observer's view
 |journal=[[AIP Conference Proceedings]]
 |volume=63
 |pages=33–37
 |bibcode=1980AIPC...63...33K
 |doi=10.1063/1.32212
 |hdl=2027.42/87614
 |url=https://deepblue.lib.umich.edu/bitstream/handle/2027.42/87614/33_1.pdf
 |hdl-access=free
 |access-date=20 March 2020
|archive-date=7 August 2020
|archive-url=https://web.archive.org/web/20200807191945/https://deepblue.lib.umich.edu/bitstream/handle/2027.42/87614/33_1.pdf
 |url-status=live
 }}</ref> The last supernova of 2005, SN 2005nc, was the 367th (14 × 26 + 3 = 367). Since 2000, professional and amateur astronomers have been finding several hundred supernovae each year (572 in 2007, 261 in 2008, 390 in 2009; 231 in 2013).<ref>
{{cite web
 |title=List of Supernovae
 |url=http://cbat.eps.harvard.edu/lists/Supernovae.html
 |publisher=[[International Astronomical Union|IAU Central Bureau for Astronomical Telegrams]]
 |access-date=25 October 2010
|url-status=live
 |archive-url=https://web.archive.org/web/20101112022554/http://www.cbat.eps.harvard.edu/lists/Supernovae.html
 |archive-date=12 November 2010
}}</ref><ref>
{{cite web
 |title=The Padova-Asiago supernova catalogue
 |url=http://graspa.oapd.inaf.it/cgi-bin/sncat.php
 |publisher=[[Asiago Astrophysical Observatory|Osservatorio Astronomico di Padova]]
 |access-date=10 January 2014
|url-status=live
 |archive-url=https://web.archive.org/web/20140110184455/http://graspa.oapd.inaf.it/cgi-bin/sncat.php
 |archive-date=10 January 2014
}}</ref>

Historical supernovae are known simply by the year they occurred: SN 185, SN 1006, SN 1054, SN 1572 (called ''Tycho's Nova'') and SN 1604 (''Kepler's Star'').<ref>{{Cite book |last1=Stephenson |first1=F. Richard |url=https://www.worldcat.org/oclc/50403827 |title=Historical Supernovae and Their Remnants |date=2002 |publisher=Clarendon Press |first2=David A. |last2=Green |isbn=0-19-850766-6 |location=Oxford |oclc=50403827 |pages=1&ndash;5, 60, 82}}</ref> Since 1885 the additional letter notation has been used, even if there was only one supernova discovered that year (for example, SN 1885A, SN 1907A, etc.); this last happened with SN 1947A. ''SN'', for SuperNova, is a standard prefix. Until 1987, two-letter designations were rarely needed; since 1988, they have been needed every year. Since 2016, the increasing number of discoveries has regularly led to the additional use of three-letter designations.<ref>{{cite web| url = https://sne.space/| title = Open Supernova Catalog| access-date = 5 February 2020| archive-date = 3 March 2016| archive-url = https://web.archive.org/web/20160303230459/https://sne.space/| url-status = live}}</ref> After zz comes aaa, then aab, aac, and so on. For example, the last supernova retained in the Asiago Supernova Catalogue&thinsp; when it was terminated on 31 December 2017 bears the designation SN 2017jzp.<!-- SN 2017jmk was the last addition to the catalogue, but jzp is the highest-lettered designation --><ref>Padova-Asiago Supernova Group, [http://graspa.oapd.inaf.it/asnc.html Asiago Supernova Catalogue], accessed 2023-12-27</ref>