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Bistatic Radar Observations of 2011 UW158

Authors: A. Ipatov, Yu. Bondarenko, Yu. Medvedev, N. Mishina, D. Marshalov, L. A. M. Benner

Journal: Transactions of IAA RAS vol. 41

Pages: 32 - 40

Year: 2017

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About the paper

Keywords: Near-Earth objects, Asteroids, Radar observations, Orbit determination

We report the results of our intercontinental bistatic radar observations of the near-Earth Asteroid 2011 UW158 during its close approach to the Earth in July 2015. A high power continuous wave signal at a fixed 8.4 GHz frequency was transmitted to the asteroid from the 70 m antenna of the Goldstone Observatory (DSS-14) and then the echo was reflected back from the target and received by the 32 m radio telescopes of the “Quasar” VLBI network in the Zelenchukskaya and Badary observatories. An analysis of the echo power spectra allowed us to estimate the size and spin period, which agrees with the photometric observations as well as to obtain some information about the asteroid’s shape and its near-surface roughness. Also, we report 18 Doppler estimates and suggest our computed images of the 2011 UW158’s heliocentric orbit.