Binary asteroid IAU announcement telegram

(3523) ARINA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; M. Husarik, Skalnate Pleso Observatory; A. Marchini,
R. Papini, and F. Salvagio, Dipartimento di Scienze Fisiche, Della Terra
e Dell’Ambiente, University of Siena; W. Cooney, Starry Night
Observatory, Columbus, TX, U.S.A.; A. Aznar, Isaac Aznar Observatory,
Alcublas, Valencia, Spain; P. Santos-Sanz, A. Sota, F. J. Aceituno,
Instituto de Astrofísica de Andalucía-CSIC, Granada, Spain, R. Goncalves 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 0.61-m telescope at the Skalnate Pleso Observatory, a 0.30-m
telescope at the Astronomical Observatory of the University of Siena,
a 0.23-m telescope at the WBRO Florence Observatory, a 0.50-m telescope
at the Starry Night Observatory, a 0.90-m telescope at the Sierra Nevada
Observatory IAA-CSIC and a 0.50-m telescope at the Shed of
Science South Observatory during Mar. 2-May 16 reveal that minor planet
(3523) is a binary system with an orbital period of 29.26 +/- 0.02 hr.
The primary shows a period of 2.6742 +/- 0.0001 hr and has a lightcurve
amplitude of 0.08 magnitude at solar phases 9-13 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.