Electronic Telegram No. 4858
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
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Prepared using the Tamkin Foundation Computer Network


(13920) MONTECORVINO
     D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; M. Husarik, G. Cervak, and M. Pikler,
Skalnate Pleso Observatory; V. Chiorny, Kharkiv Observatory; V. Benishek,
Belgrade Astronomical Observatory; and P. Sogorb, La Bastide des Jourdans,
France, report that photometric observations taken with a 0.50-m telescope
at the Sugarloaf Mountain Observatory, 0.61-m and 1.3-m telescopes at the
Skalnate Pleso Observatory, a 0.70-m telescope at the Chuguev station of the
Kharkiv Observatory in Ukraine, a 0.35-m telescope at the Sopot Observatory
in Serbia, and a 0.28-m telescope at the Bastidan Observatory in France
during Aug. 13-Sept. 20 reveal that minor planet (13920) is a binary system
with an orbital period of 15.475 +/- 0.005 hr.  The primary shows a period
of 2.20231 +/- 0.00009 hr and has a lightcurve amplitude of 0.17 mag at
solar phases 3-6 degrees, suggesting a nearly spheroidal shape.  Mutual
eclipse/occultation events that are 0.05 to 0.10 magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.22 +/- 0.02.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2020 CBAT
2020 September 23                (CBET 4858)              Daniel W. E. Green