Electronic Telegram No. 5645
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


(2607) YAKUTIA
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; P. Bacci and M. Maestripieri, Astronomical Observatory, San
Marcello Pistoiese, Italy; and N. Ruocco, Osservatorio Astronomico Nastro
Verde, Sorrento, Italy, report that photometric observations taken with a
0.35-m telescope at the Sopot Observatory in Serbia, a 0.60-m telescope at
the San Marcello Pistoiese Observatory, and a 0.35-m telescope at the
Osservatorio Astronomico Nastro Verde during Oct. 31-Nov. 14 reveal that minor
planet (2607) is a binary system with an orbital period of 16.81 +/- 0.01 hr.
The primary has a period of 2.93584 +/- 0.00010 hr and a light-curve amplitude
of 0.19 magnitude at solar phases 1-7 degrees, suggesting a nearly spheroidal
shape.  Mutual eclipse/occultation events that are 0.06 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.24.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2025 CBAT
2025 December 6                  (CBET 5645)              Daniel W. E. Green