Electronic Telegram No. 5420
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


(7089) 1992 FX1
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, P. Kusnirak,
and P. Fatka, Ondrejov Observatory; and K. Ergashev, O. Burkhonov, and
Sh. Ehgamberdiev, Ulugh Beg Astronomical Institute, Tashkent, Uzbekistan,
report that photometric observations taken with a 0.35-m telescope at the
Sopot Observatory in Serbia and a 0.6-m telescope at Maidanak Observatory in
Uzbekistan during May 28-June 15 reveal that minor planet (7089) is a binary
system with an orbital period of 19.85 +/- 0.01 hr.  The primary shows a
period of 3.0384 +/- 0.0002 hr and has a lightcurve amplitude of 0.09 mag at
solar phases 9-15 degrees, suggesting a nearly spheroidal shape.  Mutual
eclipse/occultation events that are 0.05 magnitude deep indicate a lower limit
on the secondary-to-primary mean-diameter ratio of 0.22.


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2024 July 20                     (CBET 5420)              Daniel W. E. Green