Radar observations of Comet Halley

Details Radar observations of Comet Halley Radar observations of Comet Halley

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338.1094c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 1094-1105. Research supported by NSF and NASA.

Astronomy and Astrophysics

Astronomy

43

Comet Nuclei, Halley'S Comet, Radar Astronomy, Radar Tracking, Spectral Bands, Geocentric Coordinates, Iras-Araki-Alcock Comet, Radar Cross Sections, Radiation Counters, Comets, Halley, Radar Methods, Earth-Based Observations, Astronomy, Comet Nuclei, Porosity, Grains, Ejecta, Comae, Density, Comparisons, Spacecraft Observations, Spectra, Analysis, Particles, Parameters, Reflectivity

Scientific paper

Five nights of Arecibo radar observations of Comet Halley are reported which reveal a feature in the overall average spectrum which, though weak, seems consistent with being an echo from the comet. The large radar cross section and large bandwidth of the feature suggest that the echo is predominantly from large grains which have been ejected from the nucleus. Extrapolation of the dust particle size distribution to large grain sizes gives a sufficient number of grains to account for the echo. The lack of a detectable echo from the nucleus, combined with estimates of its size and rotation rate from spacecraft encounters and other data, indicate that the nucleus has a surface of relatively high porosity.

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