Electronic Telegram No. 5610
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
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Prepared using the Tamkin Foundation Computer Network


(4373) CRESPO
     R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; P.
Pravec, P. Kusnirak, and P. Fatka, Ondrejov Observatory; V. Benishek, Belgrade
Astronomical Observatory; and K. Ergashev and O. Burkhonov, Ulugh Beg
Astronomical Institute, Tashkent, Uzbekistan, report that photometric
observations taken with a 0.50-m telescope at the Shed of Science South
Observatory, a 0.35-m telescope at the Sopot Observatory in Serbia, and a
0.6-m telescope at Maidanak Observatory in Uzbekistan during July 30-Aug. 30
reveal that minor planet (4373) is a binary system with an orbital period of
32.34 +/- 0.01 hr.  The primary shows a period of 3.5669 +/- 0.0001 hr and
has a lightcurve amplitude of 0.07 magnitude at solar phases 1-12 degrees,
suggesting a nearly spheroidal shape.  Mutual eclipse/occultation events
that are 0.10 magnitude deep indicate a secondary-to-primary mean-diameter
ratio of 0.31 +/- 0.02.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2025 CBAT
2025 September 20                (CBET 5610)              Daniel W. E. Green