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SN 2013ej was compared to supernovas SN 2004et and SN 2007od.<ref>{{Cite journal|last=Huang|first=Fang|last2=Wang|first2=Xiaofeng|last3=Zhang|first3=Jujia|last4=Brown|first4=Peter J.|last5=Zampieri|first5=Luca|last6=Pumo|first6=Maria Letizia|last7=Zhang|first7=Tianmeng|last8=Chen|first8=Juncheng|last9=Mo|first9=Jun|last10=Zhao|first10=Xulin|date=2015-04-02|title=SN 2013ej in M74: A Luminous and Fast-declining Type II-P Supernova|url=http://arxiv.org/abs/1504.00446|journal=arXiv:1504.00446 [astro-ph]}}</ref> Based on various observations it has been theorized that the supernova originated from a [[Red supergiant star|red supergiant]] star that went supernova.<ref>{{Cite journal|last=Huang|first=Fang|last2=Wang|first2=Xiaofeng|last3=Zhang|first3=Jujia|last4=Brown|first4=Peter J.|last5=Zampieri|first5=Luca|last6=Pumo|first6=Maria Letizia|last7=Zhang|first7=Tianmeng|last8=Chen|first8=Juncheng|last9=Mo|first9=Jun|last10=Zhao|first10=Xulin|date=2015-04-02|title=SN 2013ej in M74: A Luminous and Fast-declining Type II-P Supernova|url=http://arxiv.org/abs/1504.00446|journal=arXiv:1504.00446 [astro-ph]}}</ref>
SN 2013ej is one of the brightest Type II supernova detected to-date in NGC 628.<ref>{{Cite journal|last=Bose|first=Subhash|last2=Sutaria|first2=Firoza|last3=Kumar|first3=Brijesh|last4=Duggal|first4=Chetna|last5=Misra|first5=Kuntal|last6=Brown|first6=Peter J.|last7=Singh|first7=Mridweeka|last8=Dwarkadas|first8=Vikram|last9=York|first9=Donald G.|last10=Chakraborti|first10=Sayan|last11=Chandola|first11=H. C.|date=2015-06-16|title=SN 2013ej: A TYPE IIL SUPERNOVA WITH WEAK SIGNS OF INTERACTION|url=https://iopscience.iop.org/article/10.1088/0004-637X/806/2/160|journal=The Astrophysical Journal|language=en|volume=806|issue=2|pages=160|doi=10.1088/0004-637x/806/2/160|issn=1538-4357}}</ref>
==References==
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