Physics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80232e&link_type=abstract
Spitzer Proposal ID #80232
Physics
Scientific paper
We propose to use Spitzer/IRAC to physically characterize 7 near-Earth asteroids (NEAs). These seven targets have particular interest as the primary and potential backups for the OSIRIS-REx asteroid sample return mission. Specifically, we will measure the sizes and albedos of all 6 backup targets and the thermal inertias of three of these. We will measure thermal flux in both IRAC bands for a full rotation of the primary target, 1999 RQ36, to search for temperature variations indicative of small-scale albedo variation. Fluxes of NEAs in the two IRAC channels are dominated by thermal emission, measurement of which enables determination of size and albedo. Knowledge of these fundamental properties is critical for interpreting the origin and evolution of the NEA population, as well as for determining whether an object is a good target for a given spacecraft mission. Three targets have both pre- and post-opposition apparitions during GO8. Obtaining thermal fluxes of both the morning and evening side of a target provides the opportunity to improve the size/albedo determination and constrain the thermal inertia.
Barucci Antonella
Delbo' Marco
Emery Joshua
Harris Alan
Hergenrother Carl
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