Electronic Telegram No. 2188
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat@iau.org; cbatiau@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


(5899) JEDICKE
     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.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 February 25                 (CBET 2188)              Daniel W. E. Green