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Messier 100 (also known as NGC 4321) 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, and being about 60% as large. 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, and was listed as one of fourteen spiral nebulae by Lord William Parsons of Rosse in 1850. NGC 4323 and NGC 4328 are satellite galaxies of M100; the former is connected with it by a bridge of luminous matter [Text from Wikipedia]

Pubblications "Flickr" Explore - September 25 2021
Optics: GSO RC 10" F8 2000mm - Astrograph Ritchie-Chrétien
Mount: AP Mach1 GTO
Camera: QSI-640WSG
Filters: Astrodon LRGB 1.25" I Series Gen II - Astrodon Ha 5nm 1.25"
Guiding Systems: SXV-AO-LF Active Optics - SX Lodestar
Dates/Times: 2015 / 2021
Location: Pragelato - Turin - (Italy)
Exposure Details: L:R:G:B => 710:110:110:110 = > (71x10):(11x10):(11x10):(11x10) color Bin2 [num x minutes]
Cooling Details: -25°C
Acquisition: Maxim DL/CCD, Voyager
Processing: CCDStack2+, PS CC 2018
Mean FWHM: 1.44" / 2.52"
SQM-L: 20.21 / 20.48