Lightcurve Analysis of a Magnitude Limited Asteroid Sample

Synodic rotation periods and amplitudes for twelve main-belt asteroids observed at the Calvin-Rehoboth Observatory are reported: 285 Regina, 939 Isberga, 1104 Syringa, 1206 Numerowia, 1613 Smiley, 1623 Vivian, 1835 Gajdariya, 3013 Dobrovoleva, 3170 Dzhanibekov, 4411 Kochibunkyo, (5854) 1992UP, and (119245) 2001 QD293. The asteroid 939 Isberga is a binary with orbital period 26.8 ± 0.1 h. Together with five asteroids previously measured these constitute a complete magnitude limited sample which can be used to test for bias in the larger catalog of rotation periods.