It was discovered on 6 February 1916, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany.
[1] The stony S-type asteroid (Sl) has a rotation period of 10.56 hours and measures approximately 23 kilometers (14 miles) in diameter.
[3] Annika is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method (HCM) to its proper orbital elements by Nesvorný as well as by Milani and Knežević (AstDyS).
[6][16] In October 2002, a rotational lightcurve of Annika was obtained from photometric observations by Colin Bembrick at Mount Tarana Observatory (431), Australia, in collaboration with Greg Bolt and Tom Richards near Perth and Melbourne, respectively.
[9][10][11][12] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2062 and a diameter of 22.20 kilometers based on an absolute magnitude of 10.6.