Electronic Telegram No. 5449
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)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


(3969) ROSSI
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; A. Leroy, Observatoire de Besely, Ecole du Monde, Mahajanga,
Madagascar; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX,
USA, report that photometric observations taken with a 0.35-m telescope at
the Sopot Observatory in Serbia, a 0.36-m telescope at the Observatoire de
Besely, and a 0.50-m telescope at the Shed of Science South Observatory
during Aug. 13-Sept. 8 reveal that minor planet (3969) is a binary system
with an orbital period of 19.365 +/- 0.004 hr.  The primary shows a period
of 2.88972 +/- 0.00008 hr and has a lightcurve amplitude of 0.13 mag at
solar phases 1-8 degrees, suggesting a nearly spheroidal shape.  Mutual
eclipse/occultation events that are 0.08 to 0.16 magnitude deep indicate
a secondary-to-primary mean-diameter ratio of 0.28 +/- 0.02.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2024 CBAT
2024 September 17                (CBET 5449)              Daniel W. E. Green