 In October 2014, Frederick Pilcher at the Organ Mesa Observatory in New Mexico, in collaboration with astronomers at Etscorn and Bigmuskie observatories, obtained a refined period of 97.4 hours with an amplitude of magnitude ().This result supersedes other measurements by Maurice Clark, Nicolas Esseiva, Raoul Behrend, Laurent Bernasconi, Jean-Gabriel Bosch and Josep Coloma.While not being a core slow rotator, with periods above 100 hours, "Jaroslawa" has a significantly longer period than most minor planets, which typically rotate between 2 and 20 hours once around their axes.