(51356) 2000 RY76: A NEW HUNGARIA BINARY.

Analysis of CCD photometric observations of the Hungaria asteroid (51356) 2000 RY76 made in 2012 October and November shows that the asteroid is a binary system. A monomodal lightcurve for the primary has a period 2.5572 ± 0.0001 h with an amplitude of 0.09 ± 0.01 mag while a bimodal solution has a period of 5.1143 ± 0.0003 h. The shorter solution is considered the more likely. The orbital period of the presumed satellite is 62.05 ± 0.05 h using either primary period. Based on the depth of the mutual events, the satellite-primary diameter ratio is estimated to be Ds/Dp ≥ 0.21 ± 0.02.