The rotation period of this asteroid is very nearly synchronized with the rotation of the Earth. This means that only a small portion of the light curve can be observed from any one location, requiring measurements from multiple sites in order to build a complete curve. In 2012, this mission was accomplished, giving a period of 23.866 ± 0.001 hours with a brightness variation of 0.42 ± 0.02 in magnitude. Allowing for a margin of error and changes in phase angle, this finding agrees with previous measurements made in 2008 and 2011.
^Pilcher, Frederick et al. (April 2012), "Rotation Period Determination for 180 Garumna: A Triumph of Global Collaboration", The Minor Planet Bulletin (ISSN 1052-8091). Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers39 (2): 46, Bibcode:2012MPBu...39...46P.