B2 1308+326 known as OP 313 or AU CVn, is a BL Lacertae object[1] located in the constellation of Canes Venatici.

It is classified a blazar[7] although some studies described it as a transitional or change-looking due to it experiencing a shift in synchrotron peak frequencies.

[11] In June 2022, B2 1308+326 showed an optical flare, subsequently reaching a historic maximum brightness with a slight decreased flux of 0.2-0.3 magnitude in R-band observed a month later.

[17] A light curve of B2 1308+326 during 10 years between 1976 and 1986, its total range of variability was shown to be 3.0 magnitude with the detection of multiple flares.

According to observations in early 1987, it was found to be a faint state indicating the light curve showed an overall decline.