 In November 2006, a rotational lightcurve of "Amundsenia" was obtained from photometric observations by Petr Pravec at Ondřejov Observatory in the Czech Republic.Lightcurve analysis gave a well-defined rotation period of 7.7594 hours with a brightness amplitude between 0.14 and 0.16 magnitude ().According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Amundsenia" measures between 8.85 and 12.40 kilometers in diameter and its surface has an albedo between 0.151 and 0.399.