Electronic Telegram No. 5286
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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(620082) 2014 QL_433
     M. Brozovic, L. A. M. Benner, S. P. Naidu, and J. D. Giorgini, Jet
Propulsion Laboratory, California Institute of Technology, report that the
Apollo-type minor planet (620082) is a binary system.  Goldstone radar
observations (8560 MHz, 3.5 cm) obtained during 2023 Aug. 3-6, with a range
resolution of 18.75 m, reveal a primary with a diameter of approximately 300 m
and a secondary with a diameter of approximately 150 m.  A preliminary fit
suggests a nearly circular orbit with a semimajor axis of 480 +/- 30 m, an
orbital period of 11.45 +/- 0.25 hours, and a system mass of (3.8 +/- 0.7) x
10**10 kg.  The satellite underwent a radar eclipse during 11h49m-12h56m UTC
on Aug. 5 that indicated an equatorial subradar latitude.  Delay-Doppler
images of the secondary at different orbital positions suggest synchronous
rotation.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2023 CBAT
2023 August 15                   (CBET 5286)              Daniel W. E. Green