Other
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999p%26ss...47...23k&link_type=abstract
Planetary and Space Science, Volume 47, Issue 1-2, p. 23-28.
Other
3
Scientific paper
Radar echoes from the nucleus of the short-period comet Grigg-Skjellerup were obtained using the 12.6 cm wavelength radar of the Arecibo Observatory during the apparition of 20 May-2 June 1982. Dual circularly-polarized receiving channels were employed. The receiving mode orthogonally polarized to the transmission yielded an echo equal to nearly 10 times the standard deviation of the accompanying noise; no echo was detected in the polarization of the same sense as transmitted. The observations give a radar cross-section of 0.50+/-0.13 km2, and an upper limit to the width of the (unresolved) echo spectrum of less than 1 Hz. These results are consistent with specular reflection from a solid nucleus having a radius of less than 0.4 km. The upper limit depends on the unknown rotation rate and scattering law. Two other comets, comets Austin and P/Churyumov-Gerasimenko have also been probed but have not returned any detectable echo, thus allowing one to put only an upper limit on the sizes of their nuclei.
Campbell Duncan
Kamoun Paul
Pettengill G.
Shapiro Irwin I.
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