NGC 5273 is a lenticular galaxy located 54 million light-years[4] away in the northern constellation of Canes Venatici. This galaxy was discovered by William Herschel on May 1, 1785.[8] It is positioned 1+1⁄4° to the southeast of the star 25 Canum Venaticorum.[5]
The morphological classification of this galaxy is SA0(s),[4] indicating it is lenticular in form. It displays a faint, unbarred spiral structure within a generally elliptical profile.[9] NGC 5273 is classified as a type 1.5 Seyfert galaxy, with the X-ray emission from its active galactic nucleus undergoing significant absorption.[10] However, data collected between the year 2000 and 2022 suggest this is a changing–look Seyfert, with the type ranging from 1 to 1.8/1.9.[11] The activity level shows strong variability, allowing reverberation mapping of the supermassive black hole at the core. This object has an estimated mass of (4.7±1.6)×106 M☉.[9]
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