You don’t see a supernova for ages and then 2 come along in the space of a month or so. This type II supernova has been designated SN2011dh. Interestingly it was 2005 when the last Supernova was witnessed in M51. Image taken with SX-VR H36 through 12″ LX200R using SX large format adaptive optics and a IDAS II LP filter.