Messier 100 (also known as NGC 4321 or the Mirror Galaxy) is a grand design intermediate spiral galaxy in the southern part of the mildly northern Coma Berenices.
It is one of the brightest and largest galaxies in the Virgo Cluster and is approximately 55 million light-years from our galaxy,
its diameter being 107,000 light years.
It was discovered by Pierre Méchain in 1781 and 29 days later seen again and entered by Charles Messier in his catalogue "of nebulae and star clusters".
It was one of the first spiral galaxies to be discovered.
NGC 4323 and NGC 4328 are satellite galaxies of M100; the former is connected with it by a bridge of luminous matter (wiki)

On the right side we can see NGC 4312

L-Ha-RGB image:
Luminance - 2 hrs
RGB 20 min each
Ha - 30 minutes

Total of 3.5 hrs

Telescope: ASA600 24" RC with Reducer at f4.5
Mount: ASA DDM200 Direct Drive with Absolute Encoders
Camera: Moravian G3 61000 pro

Imaged from Tivoli farm, Namibia