 In October 2002, a rotational lightcurve of "Annika" was obtained from photometric observations by Colin Bembrick at Mount Tarana Observatory , Australia, in collaboration with Greg Bolt and Tom Richards near Perth and Melbourne, respectively.Lightcurve analysis gave a well-defined rotation period of hours with a brightness variation of magnitude ().This period was confirmed by Gérald Rousseau in March 2012, who determined a very similar period of hours with an amplitude of magnitude ().