(15700) 1987 QD

R. Durkee, Shed of Science Observatory, Minneapolis, MN; P. Pravec, K. Hornoch, and P. Kusnirak, Ondrejov Observatory; D. Pray, Carbuncle Hill Observatory, W. Brookfield, MA, U.S.A.; V. Chiorny and V. Shevchenko, Kharkiv Observatory; J. Oey, Leura, N.S.W., Australia; N. Gaftonyuk and Yu. Krugly, Simeiz Observatory; D. Higgins, Canberra, Australia; J. Vilagi and S. Gajdos, Modra Observatory; M. Husarik and M. Pikler, Skalnate Pleso Observatory; and J. G. Ries, McDonald Observatory, University of Texas, report that photometric observations obtained during Sept. 6-Oct. 13 reveal that minor planet (15700) is a binary-system candidate. A primary rotation period of 3.0586 +/- 0.0001 hr with a lightcurve amplitude of 0.07 mag was resolved. Superimposed to the primary lightcurve were attenuations with depths 0.1-0.3 mag and durations up to 3.5 hours that had shapes characteristic of mutual events in a binary system. A conclusive solution for the orbit period was not obtained, however, so this object remains a serious suspect for being binary, but confirmation must come from future observations.