[6] M61 is one of the largest members of Virgo Cluster, and belongs to a smaller subgroup known as the S Cloud.

[7][8] The morphological classification of SAB(rs)bc[3] indicates a weakly-barred spiral (SAB) with the suggestion of a ring structure (rs) and moderate to loosely wound spiral arms.

[11] Evidence of significant star formation and active bright nebulae appears across M61's disk.

[13] Unlike most late-type spiral galaxies within the Virgo Cluster, M61 shows an unusual abundance of neutral hydrogen (H I).

[14] Eight supernovae have been observed in M61, making it one of the most prodigious galaxies for such cataclysmic events.