M100 in Coma Berenices

M100 Galaxy Astrophotography Martin Rusterholz

M100 /​ Messi­er 100 (also known as NGC 4321) is a grand design inter­me­di­ate spir­al galaxy loc­ated with­in the south­ern part of con­stel­la­tion Coma Berenic­es. It is one of the bright­est and largest galax­ies in the Virgo Cluster, loc­ated approx­im­ately 55 mil­lion light-years dis­tant from Earth and has a dia­met­er of 107,000 light years, roughly 60% the size of the Milky Way. It was dis­covered by Pierre Méchain on March 15, 1781 and was sub­sequently entered in Messi­er­’s cata­logue of neb­u­lae and star clusters after Charles Messi­er made obser­va­tions of his own on April 13, 1781. The galaxy was one of the first spir­al galax­ies to be dis­covered, and was lis­ted as one of four­teen spir­al neb­u­lae by Lord Wil­li­am Par­sons of Rosse in 1850. NGC 4322 (right) and NGC 4328 (top) are satel­lite galax­ies of M100; the former is con­nec­ted with it by a bridge of lumin­ous mat­ter.
North is to the right in this image.

[descrip­tion from Wikipedia]


RCOS 14.5″ f/​8
Andor CG16M
Astro­don Gen2
LRGB 520:200:200:200 min.
ROSA Remote Obser­vat­or­ies South­ern Alps
© Mar­tin Ruster­holz, Astrophotographer

Find­er Chart M100

M100 Skychart Astrophotography Martin Rusterholz

Image cre­ated by Skychart