B. D. Warner, Palmer Divide Observatory, Colorado Springs, CO; A. W. Harris, Space Science Institute, La Canada, CA, U.S.A.; P. Pravec, Ondrejov Observatory; and J. Pollock, Appalachian State University, report that photometric observations obtained during Feb. 2-20 reveal that minor planet (5899) is a binary system with an orbital period of 16.7 +/- 0.1 hr. The primary lightcurve amplitude of of 0.04 mag suggests a nearly spheroidal shape. Several periods in the range of 3-4 hr were found for the primary, but due to the low amplitude it is not possible to state any one period with certainty. Observed mutual eclipse/occultation events indicate a secondary-to-primary mean-diameter ratio of Ds/Dp greater-than-or-equal-to 0.32. Follow-up observations after the full moon are encouraged to see if the shape and/or depth of the mutual events change.
Central Bureau Electronic Telegrams
- Pub Date:
- February 2010