NATIONAL ASTRONOMY AND IONOSPHERE CENTER . ... Planetary Radar . ... Asteroids . ... Radar imaging of near-Earth asteroids can provide dramatic images with resolutions down to 8 m, comparable to the images obtained by the Galileo and NEAR-Shoemaker spacecraft. ... Asteroid 2001 GQ2 was imaged by the Arecibo radar system during April, 2001 by M. Nolan. ... These radar images of main-belt asteroid 216 Kleopatra were obtained in November, 1999, about one hour apart (Ostro et al 2000, Science). ...

... 2.3 Data acquisition Spectra generated by the Multibeam correlator contain the usual structure seen in spectra from other H i instruments: a bandpass spectrum which is the sum of the sky , ground and receiver temperatures multiplied by the product of the filters in the receiver chain; superimposed on this is a noise ... Note also that sources extended much beyond ,40 arcmin can be imaged poorly in HIPASS images because of the bandpass sidelobe effect described in Section 3.3. ...