Разделы

Radar observations of Near-Earth Objects

Radar astronomy is one of the most effective techniques for determining the physical properties of near-Earth objects (NEOs). The size, shape, spin period and surface properties of NEOs can be obtained using radar observations. Radar observations require both transmitting and receiving antenna systems with highly sensitive equipment for recording echoes, as well as software for preparing observations and processing the data. Since 2015, the Institute of Applied Astronomy in cooperation with the Jet Propulsion Laboratory and Goldstone Deep Space Communications Complex conduct intercontinental bistatic radar observations of NEOs using 70-m antenna (DSS-14) to transmit and 32-m radio telescopes (RT-32) of “Quasar” VLBI network in Svetloe, Zelenchukskaya and Badary observatories to receive the echoes.

Observed Objects

Parameters of NEOs detected at RT-32

NEO Epoch of observation
D, m
P, h
R, au
B, Hz
RTT, sec
SNR/RTT
2017 VR12 2018 Mar 05 138 1.4 0.012 10 12 6
3200 Phaethon 2017 Dec 17 5100 3.6 0.069 140 69 3
3122 Florence 2017 Sep 04 4500 2.4 0.052 187 52 13
2003 BD44 2017 Apr 19 1400 80.0 0.057 5 57 8
2014 JO25 2017 Apr 18 650 4.5 0.024 14 24 14
2003 YT1 2016 Oct 31 1100 2.3 0.035 47 35 8
2003 TL4 2016 Oct 29 380 27.2 0.029 2 28 11
2011 UW158 2015- Jul 18 320 0.6 0.017 52 16 8

The size distribution of NEOs detected on RT-32, depending on the distance to the Earth. The dashed line shows the distances to the Earth and the NEOs diameters assuming a Signal-to-Noise Ratio of 3, a rotation period P=9 h, a radar albedo σ̂=0.1 and a transmitter power Ptx = 400 kW on a corresponding round-trip light-times.

List of Publications

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