Original sentence: [[Image:SN1994D.jpg|thumb|SN 1994D in  | accessdate = 2007-10-16 }}
Edited sentence: Afterward, pairs of lower-case letters are used, starting with aa, ab, and so on.For example, the last supernova of 2005 was SN 2005nc, indicating that it was the 367th supernova found in 2005.Professional and amateur astronomers find several hundreds of supernovae each year (367 in 2005, 551 in 2006 and 572 in 2007).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 it.The first 26 supernovae of the year get designated with an upper case letter from A to Z.The name is formed by the year of discovery, immediately followed by a one or two-letter designation