V598 Puppis

V598 Puppis is the name given to a nova in the Milky Way Galaxy. USNO-A2.0 0450-03360039, the catalog number for the star, was discovered to be much brighter than normal in X-ray emissions on October 9, 2007, by the European Space Agency's XMM-Newton telescope.cite web |url=http://www.space.com/scienceastronomy/080722-st-star-found.html |title=SPACE.com -- The Exploding Star That Everyone Missed |format= |work= |accessdate=2008-07-22 cite web |url=http://www.esa.int/esaSC/SEMH9HWIPIF_index_0.html |title=ESA - Space Science - XMM-Newton discovers the star that everyone missed |format= |work= |accessdate=2008-07-22] Ultimately, the star was confirmed to 600 times brighter than normal by the Magellan-Clay telescope at Las Campanas Observatory in Chile.

The nova has been officially named V598 Puppis and is "one of the brightest for almost a decade". Despite its brightness, the nova was apparently missed by amateur and professional astronomers alike until XMM-Newton spotted the unusual X-ray source while turning from one target to another. The All Sky Automated Survey determined that that nova had occurred on June 5, 2007.

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