[10] AP Lib is surrounded by an extended source with a spectrum characteristic of a red-shifted giant elliptical galaxy.

[6] This object was first identified as an optical variable by Martha D. Ashbrook in 1942, who noted the brightness changed irregularly from magnitude 15.0 down to 16.0.

[12] Howard E. Bond and Francois Biraud in 1971 noted the coincidence of this object with the position of the radio source PKS 1514–24.

[14] AP Librae emits a synchrotron radiation component to its spectral energy distribution (SED).

[15] In 1998–99, extended radio emission was detected from a one-sided jet that starts in a south-easterly direction from the source before bending to the northeast.