[1] Based on its classification into the Gefion family, Annenskij is a stony S-type asteroid.
[12]: 23 Two rotational lightcurves of Annenskij were obtained from photometric observations by Italian and French amateur astronomers Silvano Casulli, Laurent Bernasconi and Cyril Cavadore .
Lightcurve analysis gave a rotation period of 3.969 and 3.974 hours with a brightness amplitude of 0.30 and 0.28 magnitude (U=3-/3).
[10] According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Annenskij measures between 12.09 and 15.386 kilometers in diameter and its surface has an albedo between 0.1744 and 0.235.
[4][5][6][7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2021 and a diameter of 14.15 kilometers based on an absolute magnitude of 11.6.