NGC 4457 is an intermediate spiral galaxy located about 55 million light-years away in the constellation of Virgo. It is also classified as a LINER galaxy, a class of active galaxy defined by their spectral line emissions. NGC 4457 Is inclined by about 33ð. It was discovered by astronomer William Herschel on February 23, 1784. Despite being listed in the Virgo Cluster Catalog as VCC 1145, NGC 4457 is a member of the Virgo II Groups which form an extension of the Virgo cluster.
NGC 4457 may have had a recent minor merger with another galaxy.
On July 1 2020, an astronomical transient was discovered in NGC 4457 by astronomer KÃ Âichi Itagaki and confirmed by ASAS-SN. Spectroscopic classification determined the object to be a type Ia Supernova, designated SN2020nvb.
NGC 4457 has a broad oval zone containing an inner spiral which is defined mainly by two fairly open arms. There is a well-defined outer ring that is completely detached from the inner regions of the galaxy.
NGC 4457 has a severely reduced amount of star-formation in its disk while its inner regions have a normalized rate of massive star formation. This may have been caused by a recent interaction of the gas in the galaxy with the gas in the surrounding Virgo Cluster, causing the gas to be stripped away in an effect known as ram-pressure stripping.