M100, also known as NGC 4321, stands as a majestic example of a grand spiral galaxy, nestled within the constellation Coma Berenices. With its sweeping spiral arms and bright core, M100 exhibits intricate patterns of star formation and stellar activity across its vast expanse. Spanning approximately 107,000 light-years in diameter, M100 ranks among the largest galaxies in the Virgo Cluster, a rich cluster of galaxies located some 55 million light-years away from Earth.

As one of the brightest members of the Virgo Cluster, M100 offers astronomers a wealth of insights into the dynamics of galactic evolution. Its spiral arms are adorned with regions of intense star formation, where massive stars are born from the gravitational collapse of dense molecular clouds. Additionally, M100 harbors a supermassive black hole at its center, whose gravitational influence shapes the galaxy's structure and influences its surrounding environment. By studying galaxies like M100, astronomers gain valuable knowledge about the processes driving the formation and evolution of galaxies throughout the universe.

Located in the constellation Coma Berenices, M100 is a grand design spiral galaxy approximately 55 million light-years away from Earth. With a diameter spanning over 100,000 light-years, it is one of the largest and brightest members of the Virgo Cluster of galaxies. M100 exhibits prominent spiral arms filled with young, hot stars, as well as dark dust lanes that trace the galaxy's structure. Its bright nucleus harbors a supermassive black hole, which is believed to play a crucial role in regulating the galaxy's growth and evolution.

Originally discovered by Pierre Méchain in 1781, M100 is celebrated for its exceptional beauty and rich astrophysical significance. It serves as a key object of study for astronomers seeking to understand the processes driving the formation and evolution of spiral galaxies. Through detailed observations and analysis, researchers have uncovered a wealth of information about M100's stellar population, star formation activity, and overall structure, contributing to our broader understanding of galactic dynamics and cosmology. As a captivating cosmic gem nestled within the vastness of the universe, M100 continues to inspire and intrigue observers with its timeless allure.

May 11 - June 17, 2020

Location: Dark Sky New Mexico

Telescope: Planewave CDK-17

Camera: FLI PL16803

Mount: Paramount ME

Luminance: 22x20 minutes (binned 1x1)

Red: 16x20 minutes (binned 1x1)

Green: 16x20 minutes (binned 1x1)

Blue: 18x20 minutes (binned 1x1)

Copyright: Bernard Miller

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[3] distant from Earth and has a diameter of 107,000 light years, roughly 60% the size of the Milky Way.