Messier galaxy M100 is a (grand design) spiral galaxy located in the constellation Coma Berenices. It is one of the brightest and largest (diameter is about 107.000 light years) galaxies in the Virgo Cluster, located approximately 55 million light years from us..

Dimension: 7.5' x 6.1' 
Magnitude: 9.4
Surface brightness: 13.4

26.4.2015

Optics:

Camera:
Filters:
Mount:
Guider
Exposure:

NoName Newton 200/800
+ GPU c.c.
Atik 428EX
LRGB Baader.
SW AZEQ-6
Lacerta MGEN
17x5 min. (L)
7x5 min. (each R,G, B)

I can also present a slightly wider version of M100 (luminance only), with another (edge-on) spiral galaxy NGC4312 to the right, almost full field of the Atik 428EX.

M100 wide, L

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