NGC 5123 is a spiral galaxy in the constellation of Canes Venatici. Its velocity with respect to the cosmic microwave background is , which corresponds to a Hubble distance of . It was discovered by German-British astronomer William Herschel on 9 April 1787.
NGC 5123 is a radio galaxy, i.e. it has giant regions of radio emission extending well beyond its visible structure.
Supernova One supernova has been observed in NGC 5123: SN 2008dz (TypeII, mag. 17.4) was discovered by Tim Puckett and Robert Gagliano on 6 July 2008.
See also List of NGC objects (5001–6000)
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