Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..883z&link_type=abstract
In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed
Physics
2
Near-Earth Objects: Radar Observations
Scientific paper
We present the first radar detection of near-Earth asteroid 1998 WT24 that was performed with the bistatic system Evpatoria → Medicina operating at 6 cm wavelength during WT24 close approaching to Earth at a distance of 0.0125 AU. Radar echo from WT24 was detected during both observational days on Dec. 16, 17, 2001. The maximum value of signal to noise level ratio was about 0.4 for filter, matched with echo bandwidth, which results in OC radar cross section of 0.02 km2. Doppler trend of spectrum center doesn't exceed 0.44 mHz/sec, the echo spectrum bandwidth varies from 6.2 to 6.7 Hz and the WT24's pole-on breadth is ~0.41 km, the estimation of radar albedo is ~0.1. Of most interest is the measurements result giving near-unity circular polarization ratio. Such combination of low radar albedo and near-unity circular polarization ratio may be interpreted as a property of comet-like surface.
Afanas'eva Tatiana
Bortolotti Claudio
Cattani Alessandro
Delbo' Marco
di Martino Mario
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