Mathematics – Logic
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.2902b&link_type=abstract
American Astronomical Society, DPS meeting #41, #29.02
Mathematics
Logic
Scientific paper
The shape of an object is among its most fundamental physical attributes and is a basic key to understanding its origin and geologic history. With detailed models of real near-Earth asteroids (NEAs), it is possible to explore the evolution and stability of close orbits, with direct application to the design of spacecraft mission trajectories; the retention and redistribution of impact ejecta; the evolution of spin states due to YORP; and questions about the origins and dynamical evolution of binary NEAs. The shape inversion technique was developed by Scott Hudson and has now been utilized to estimate 3-D shapes of about 25 NEAs and three main-belt asteroids; data suitable for shape inversion are available for perhaps a few dozen others. Modeling has revealed the shapes of contact binaries and true binary systems; highly elongated and irregular objects; spheroids; rubble piles; a non-principal axis rotator; and asteroids that may be collisionally-produced impact shards. Recent shape modeling is suggesting that equatorial ridges on rapidly rotating NEAs may be relatively common. Currently there are numerous opportunities annually for NEA radar imaging at Arecibo and Goldstone that can yield data suitable for shape inversion. I will present an overview of shape modeling results, briefly mention modeling in progress for several NEAs, and conclude with new results for 7 Iris, a topographically rugged main belt asteroid with pronounced concavities near its south pole.
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