is a barred spiral galaxy of magnitude 10.1 and a size of 6.5 'x 5.8' arc. It lies at a distance of about 75 million light years and its estimated size is about 100,000 light years. A supernova (the Latin nova, 'new') is a stellar explosion that may manifest itself in a very remarkable, even to the naked eye in parts of the celestial sphere where previously there had detected nothing in particular. For this reason, such events were called initially stellae novae ("new star") or simply novae. Over time they made the distinction between phenomena apparently similar but very different intrinsic luminosity, the fainter novae continued calling (novae), while the brighter they added the prefix "super- ."
Supernovae produce very intense light flashes which can last from several weeks to several months. They are characterized by a rapid increase in intensity until it reaches a maximum (more than the rest of the galaxy) and then decreases in brightness more or less smooth to disappear completely.
In the drawing can be seen near the nucleus the SN2011B supernova magnitude at the time the picture was about 13.1 but has become brighter. Keep in mind that we are seeing a star in another galaxy, in my case it was the first time and the truth that is something worth watching.
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