(5037) Habing

P. Pravec, Ondrejov Observatory; D. Oszkiewicz and V. Troianskyi, Adam Mickiewicz University, Poznan, Poland; B. A. Skiff, Lowell Observatory; V. Benishek, Belgrade Astronomical Observatory; A. Aznar Macias, Isaac Aznar Observatory, Alcublas, Valencia, Spain; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; and B. D. Warner, Center for Solar System Studies, Rancho Cucamonga, CA, U.S.A., report that photometric observations taken with 0.7-m and 1.1-m telescopes at Lowell Observatory during Feb. 15-Mar. 4 reveal that minor planet (5037) is a binary system with an orbital period of 21.74 +/- 0.03 hr. The primary shows a period of 2.8291 +/- 0.0002 hr and has a lightcurve amplitude of 0.25 magnitude at solar phases 4-7 degrees. Mutual eclipse/occultation events that are 0.05 to 0.11 magnitude deep indicate a lower limit on the secondary-to-primary mean- diameter ratio of 0.22. These results were confirmed with independent observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.35-m telescope at the Isaac Aznar Observatory, and a 0.50-m telescope at the Sugarloaf Mountain Observatory during Feb. 21-29.