The Physical Properties of Near-Earth Asteroids Associated With Meteoroid Streams

Details The Physical Properties of Near-Earth Asteroids Associated With Meteoroid Streams The Physical Properties of Near-Earth Asteroids Associated With Meteoroid Streams

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50716k&link_type=abstract

Spitzer Proposal ID #50716

Physics

Scientific paper

The recent Near-Earth asteroid surveys have discovered a number of bodies now identified as parents of our meteor showers. We propose a 7.5 hr Spitzer program to study the physical properties and meteoroid streams of 4 near-Earth asteroids. We will assess the size, albedo, surface composition, and thermal inertia of all 4 targets with 7-14 micron IRS spectra. We also propose MIPS 24 micron maps to measure each targets' meteoroid stream and assess their recent cometary activity. We expect that NEAs associated with meteor showers are all primitive in nature, i.e., they are derived from primitive main belt asteroids, or extinct Jupiter-family comets. We will compare the physical parameters of our targets to NEAs not associated with meteor showers, and to primitive asteroids, in the Spitzer archive. It is important to study NEAs in order to: 1) determine the sources of the current NEA population, 2) characterize the sources of meteorites, meteor showers, and interplanetary dust particles accumulated by the Earth, 3) characterize the properties of Earth impact hazards, and 4) find interesting targets of future robotic and human space exploration missions (e.g., Marco Polo and OSIRIS, two proposed sample return missions). Meteor showers also have a wide public appeal and Spitzer observations of these objects are likely to attract much attention whenever a new call for meteor shower observations is issued to the public.

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