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We evaluated the planetary radar capabilities at Arecibo, the Goldstone 70-mDSS-14 and 34-m DSS-13 antennas, the 70-m DSS-43 antenna at Canberra, the GreenBank Telescope, and the Parkes Radio Telescope in terms of their relativesensitivities and the number of known near-Earth asteroids (NEAs) detectableper year in monostatic and bistatic configurations. In the 2015 calendar year,monostatic observations with Arecibo and DSS-14 were capable of detecting 253and 131 NEAs respectively, with signal-to-noise ratios (SNRs) greater than30/track. Combined, the two observatories were capable of detecting 276 NEAs.Of these, Arecibo detected 77 and Goldstone detected 32, or 30% and 24% thenumbers that were possible. The two observatories detected an additional 18 and7 NEAs respectively, with SNRs of less than 30/track. This indicates that asubstantial number of potential targets are not being observed. The bistaticconfiguration with DSS-14 transmitting and the Green Bank Telescope receivingwas capable of detecting about 195 NEAs, or ~50% more than with monostaticobservations at DSS-14. Most of the detectable asteroids were targets ofopportunity that were discovered less than 15 days before the end of theirobserving windows. About 50% of the detectable asteroids have absolutemagnitudes > 25, which corresponds diameters < ~30 m.

Capabilities of Earth-based radar facilities for near-Earth asteroid observations