||Unless otherwise stated, the "Reduced Magnitudes" in the plots are
Cousins R, based on 2MASS to BVRI conversions (Warner, MPB 34, 113-119)Follow-up to 2009 and 2010. Collaboration with David Higgins (Hunters Hill Observatory, AUSTRALIA) and Petr Pravec (Astronomical Institute, CZECH REPUBLIC). The 2011 solution is ambiguous, with one near 3.4 h possible. The period from none of the three apparitions agrees with the other two. The reason is unknown, though tumbling might be one possibility.