NGC 4561
NGC 4561 is a barred spiral galaxy in the constellation Coma Berenices. It was discovered by German-British astronomer William Herschel on April 13, 1784. This galaxy is located at a distance of from the Milky Way, and is a member of the Virgo Cluster of galaxies. It is 13th magnitude with an angular size of.
The morphological classification of NGC 4561 in the De Vaucouleurs system is SBdm, indicating a barred spiral galaxy with a transitional inner ring structure, loosely wound spiral arms, and an irregular appearance with no bulge component. The galactic plane is inclined at an angle of 28° to the plane of the sky, with the major axis aligned along a position angle of 60°. It has a star formation rate of ·yr−1. The net stellar mass of the galaxy is.
A nuclear X-ray source was detected in NGC 4561 by Chandra, and was determined to be an active galactic nucleus based on XMM-Newton observations. It has a small supermassive black hole at the source, with a mass of at least.