到目前為止,人們在NGC 2403裡發現了兩個超新星,分別是 SN 1954J和SN 2004dj。
参考文献编辑
^ 1.01.11.21.31.41.51.61.7NASA/IPAC Extragalactic Database. Results for NGC 2403. [2006-11-21]. (原始内容于2011-05-14).
^ 2.02.12.2Kepple, George Robert; Glen W. Sanner. The Night Sky Observer's Guide, Volume 1. Willmann-Bell, Inc. 1998: 73. ISBN 0-943396-58-1.引文使用过时参数coauthors (帮助)
^Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W., A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies, Astrophysical Journal Supplement 112, October 1997, 112: 315–390 [2008-03-08], (原始内容于2016-01-10) 引文格式1维护:日期与年 (link)