Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..877o&link_type=abstract
(Astronomical Society of the Pacific, Symposium on New Directions in Asteroids and Comet Research, Northern Arizona University,
Astronomy and Astrophysics
Astronomy
11
Asteroids, Comets, Radar Astronomy, Radar Detection, Apollo Asteroids, Iras-Araki-Alcock Comet, Power Spectra, Radar Echoes, Toro Asteroid
Scientific paper
Radar observations of asteroids and comets provide information about these objects' sizes, shapes, spin vectors, decimeter-scale morphology, topographic relief, regolith porosity, and metal concentration. On average, small, near-earth asteroids are rougher at decimeter scales than comets or mainbelt asteroids. Asteroid 2 Pallas is smoother than the moon at decimeter scales but much rougher than the moon at some much larger scale(s). There is at least a five-fold variation in the radar albedos of main-belt asteroids, implying substantial variation in these objects' surface porosities or metal concentrations. The highest albedo estimate, for 16 Psyche, is consistent with a metal concentration near unity and lunar porosities. The radar polarization signature of the near-earth object 2101 Adonis is anomalous, resembling that of Jupiter's satellite Callisto more than that of any other radar-detected planetary target. The echo spectra of comet IRAS-Araki-Alcock reveal an irregular, ≡7-km sized nucleus and an associated debris swarm, at least 103 times larger than the nucleus and comprised of particles at least a centimeter in size.
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