NGC 4559
NGC 4559 is an intermediate spiral galaxy with a weak inner ring structure in the constellation Coma Berenices. Its velocity with respect to the cosmic microwave background is, which corresponds to a Hubble distance of. However, 26 non-redshift measurements give a much closer distance of. It was discovered by German-British astronomer William Herschel on 11 April 1785.
NGC 4559 is a member of the Coma I Group.
One supernova has been recorded in NGC 4559: SN 1941A was discovered by Rebecca Jones on 24 February 1941, and after checking previous photographs of the galaxy, it was determined that the supernova was visible starting 5 February 1941.
NGC 4559 is home to the luminous blue variable AT2016blu. It was discovered by the Lick Observatory Supernova Search on 11 January 2012. It experiences repeated supernova-like outbursts: first when discovered, then again in 2014, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2024, 2025, and 2026.