Electronic Telegram No. 5314
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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2023 QE_6
     P. Pravec, P. Kusnirak, K. Hornoch, P. Fatka, and H. Kucakova, Ondrejov
Observatory, report that photometric observations taken with a 1.54-m
telescope at the La Silla station of the European Southern Observatory during
Oct. 13-21 reveal that the Amor-type minor planet 2023 QE_6 (cf. MPEC
2023-Q138) is a binary system with an orbital period of 17.36 +/- 0.02 hr.
The primary has a period of 2.3801 +/- 0.0005 hr and a lightcurve amplitude
of 0.12 magnitude at solar phases 7-9 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.  The
system's mean absolute magnitude is H = 21.15 +/- 0.08, assuming a phase-
relation slope parameter G = 0.24 +/- 0.11.  The color index in the
Johnson-Cousins photometric system is (V - R) = +0.40 +/- 0.04.  Follow-up
observations (e.g., photometric or spectroscopic) taken during the rest of
the current apparition of the minor planet are encouraged, to improve the
characterization of the binary system.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2023 CBAT
2023 November 9                  (CBET 5314)              Daniel W. E. Green