Electronic Telegram No. 5481
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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(64338) 2001 UU_64
     M. Conjat, Observatoire de la Cote d'Azur; J. F. Gout, Starkville, MS,
USA; D. Augustin, Anglet, France; F. Manzini, Sozzago, Italy; and R. Behrend,
Geneva Observatory, Switzerland, report that photometric observations taken
with four telescopes (a 0.40-m telescope at the Nice Observatory; a 0.35-m
telescope at Starkville; a 0.35-m telescope at the E-EyE observatory outside
of Fregenal de la Siera, Spain; and a 0.40-m telescope at Stazione Astronomica
di Sozzago) during 2024 Nov. 28-Dec. 8 reveal that minor planet (64338) is a
binary system with an orbital period of 19.63 +/- 0.01 hr.  The primary shows
a period of 3.818 +/- 0.001 hr with light-curve amplitude of 0.1 mag at solar
phases 1-7 degrees.  Mutual eclipse/occultation events that are 0.2 to 0.25
magnitude deep indicate a lower limit on the secondary-to-primary mean-
diameter ratio of 0.45.


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                         (C) Copyright 2024 CBAT
2024 December 21                 (CBET 5481)              Daniel W. E. Green