Electronic Telegram No. 5110
Central Bureau for Astronomical Telegrams
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(350751) 2002 AW
     P. Pravec, P. Kusnirak, K. Hornoch, P. Fatka, and H. Kucakova, Ondrejov
Observatory; J. Licandro and J. de Leon, Instituto de Astrofisica de Canarias;
and M. Popescu, G. N. Simion, and B. A. Dumitru, Astronomical Institute of the
Romanian Academy, report that photometric observations taken with the 1.54-m
Danish telescope at the La Silla station of the European Southern Observatory
and the 1.52-m Carlos Sanchez telescope at Teide Observatory during Feb. 5-
Mar. 12 reveal that the Apollo-type minor planet (350751) is a binary system
with an orbital period of 25.12 +/- 0.02 hr.  The primary has a period of
4.647 +/- 0.002 hr and a lightcurve amplitude of 0.08 magnitude at solar
phases 1-9 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 0.21 +/- 0.02.  The system's mean absolute
H = 20.74 +/- 0.02 was determined assuming a phase-relation slope parameter
G = 0.12 +/- 0.08.  The color index in the Johnson-Cousins photometric system
is (V - R) = +0.370 +/- 0.010.  The color indices in the SDSS photometric
system are (g - r) = +0.40 +/- 0.05 and (r - z) = +0.12 +/- 0.05.  The colors
indicate a B-type classification.  These observations were run as a part of
the Ondrejov photometric project "NEOSource" within its task to study
potential space-mission targets.  Minor planet (350751) was selected as a
target because it is listed on the "Near-Earth Object Human Space Flight
Accessible Targets Study (NHATS)" webpage (https://cneos.jpl.nasa.gov/nhats/).
(The observations were performed in the framework of "NEOROCKS" collaboration,
which is funded by the European Union's Horizon 2020 research and innovation
programme.)  Follow-up observations are encouraged.


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2022 March 19                    (CBET 5110)              Daniel W. E. Green