Physics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004adspr..33.1576c&link_type=abstract
Advances in Space Research, Volume 33, Issue 9, p. 1576-1583.
Physics
1
Near-Earth Asteroids: Discovery, Near-Earth Asteroids: Physical Characterization, Aten Asteroids, Thermal Radiometry, Space-Based Ir Observations, Impact Hazard
Scientific paper
We present a concept for a dedicated space-based observatory for NEO physical characterization and discovery of objects belonging to orbital classes difficult to observe from the ground (Atens, lEOs). The purpose of such a mission is to derive NEO sizes and albedos using the radiometric technique, and to discover a large fraction of the existing Atens and lEOs during an operational lifetime of a few years. Intrinsic advantages of a space-based platform for reaching the above objectives are discussed, as well as several options for the choice of the satellite orbit. It seems likely that current technology is sufficiently mature to field a relatively inexpensive mission, in which most of the thermal constraints are met by means of passive cooling. The thermal load on the system is greatly reduced if the spacecraft orbits far from the most intense sources of heat, e.g., in the L2 Lagrangian points of the Earth or Venus. Based upon preliminary simulations presented herein the Earth L2 option is the better choice.
Cellino Alberto
Muinonen Karri
Tedesco Edward F.
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