M100 ist a bright ( 9.3mag),nearly faced-on galaxy in the constellation of Coma berenices,with the apparent size of about 7.5´x 6,1´.It´s the brightest member of the northern part of the Virgo-Supercluster and was discovered by by Pierre Méchain in 1781.The distance is 55 million lightyears.
There was a supernova in 2006,which still emitts strong X-ray radiation.
RA: 12h 22m 54,95s
Dekl.: +15° 49′ 19,5″
Integration time: L R(Ha)GB (L=23x1200s, RGB=7x1200s each,Ha=3x2400s) ergo a total time of 15hours
80cm f/7 Astrooptik Keller cassegrain, FLI PL-16803, LRGB Astrodon filters, Prompt 7 CTIO Chile
Image processing: Bernd Flach-Wilken
here you can see a 80% sized picture,click on it to see it in full resolution
here you can see a cropped version: