Electronic Telegram No. 5637
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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(44168) 1998 JJ_4
     D. Augustin, Anglet, France; R. Behrend, Geneva Observatory; P. Pravec,
Ondrejov Observatory; A. Leroy, Uranoscope de l'Ile de France, Gretz-
Armainvilliers, France; and A. Rajaonarivelo, H. J. Ralaimanampisoa, and
F. Rabemanotrona, Haikintana Astronomy, Madagascar, report that photometric
observations taken with a 0.35-m telescope at e-EyE Observatory in Spain and a
0.36-m telescope at Ecole du Monde Besely in Madagascar during Sept. 24-Oct.
11 reveal that minor planet (44168) is a binary system with an orbital period
of 17.39 +/- 0.02 hr.  The primary has a period of 2.5540 +/- 0.0002 hr and a
lightcurve amplitude of 0.09 magnitude at solar phases 14-20 degrees,
suggesting a nearly spheroidal shape.  Mutual eclipse/occultation events that
are 0.07 magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.26.


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2025 November 12                 (CBET 5637)              Daniel W. E. Green