Electronic Telegram No. 5201
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


(3187) DALIAN
     M. Conjat, Observatoire de la Cote d'Azur (using a 0.40-m telescope at
the Nice Observatory); D. Augustin (using a "Deep Sky Chile" 0.14-m refractor
at Pichasca, Chile, and a 0.35-m telescope at the E-Eye Observatory in Spain);
F. Manzini (using a 0.40-m telescope at Stazione Astronomica di Sozzago in
Italy); R. Nicollerat (using a 0.35-m telescope at Valentines Observatory,
Bex, Switzerland); R. Roy (using a 0.40-m telescope at Observatoire de Blauvac
in France); and R. Behrend, Geneva Observatory, report that photometric
observations taken during nine nights from 2022 Nov. 20 to Dec. 11 reveal that
minor planet (3187) is a binary system with an orbital period of 17.461 +/-
0.005 hr.  The primary shows a period of 2.7086 +/- 0.0001 hr with a light-
curve amplitude of 0.1 magnitude at solar phases 7-17 degrees.  Mutual
eclipse/occultation events that are 0.07 to 0.13 magnitude deep indicate a
lower limit on the secondary-to-primary mean-diameter ratio of 0.26.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2023 CBAT
2023 January 4                   (CBET 5201)              Daniel W. E. Green