Electronic Telegram No. 5371
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


(2280) KUNIKOV
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
and K. Hornoch, Ondrejov Observatory; M. Husarik, M. Pikler, D. Tomko, and M.
Kovacova, Skalnate Pleso Observatory; and R. Durkee, Shed of Science South
Observatory, Pontotoc, TX, U.S.A., report that photometric observations taken
with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.65-m telescope
at Ondrejov Observatory, a 0.61-m telescope at the Skalnate Pleso Observatory,
and a 0.50-m telescope at the Shed of Science South Observatory during 2023
Dec. 4-2024 Feb. 18 reveal that minor planet (2280) is a binary system with an
orbital period of 21.479 +/- 0.003 hr.  Mutual eclipse/occultation events that
are 0.61- to 0.76-magnitude deep indicate a lower limit on the secondary-to-
primary mean-diameter ratio of 0.87.  Rotations of the components appear to be
synchronous with the orbital motion and an amplitude of the combined primary-
plus-secondary rotational lightcurve is 0.45 mag at solar phases 2-22 deg.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2024 CBAT
2024 March 21                    (CBET 5371)              Daniel W. E. Green