IRS Spectra of Basaltic Asteroids: Vestoids, 1459 Magnya, and Other Non-Vestoid Basaltic Asteroids

Details IRS Spectra of Basaltic Asteroids: Vestoids, 1459 Magnya, and Other Non-Vestoid Basaltic Asteroids IRS Spectra of Basaltic Asteroids: Vestoids, 1459 Magnya, and Other Non-Vestoid Basaltic Asteroids

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50259l&link_type=abstract

Spitzer Proposal ID #50259

Mathematics

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Scientific paper

We propose to observe the thermal emission spectra of selected small basaltic asteroids for mineralogical analysis. Our targets will include members of the dynamical family of the unique large differentiated asteroid 4 Vesta (``Vestoids''), four outer-main-belt basaltic asteroids whose orbits exclude them from originating on 4 Vesta, and a basaltic near-Earth asteroid (NEA). Our goal is to address the relationship between the population of Vesta fragments in space (Vestoids), those that have made their way to Earth (``HED'' meteorites), and basaltic fragments from differentiated parent bodies other than 4 Vesta. We plan to characterize the silicate compositions of these asteroids and in particular to achieve unambiguous detection and characterization of their plagioclase components (see below under ``Mineralogy''), which are notoriously difficult to measure in the visible and near-IR. Identifying and characterizing occurrences of differentiation in the Main Belt, as traced by basaltic asteroids, offers important insight to the thermal state of protoplanetary material. This in turn affects the initial conditions for planet formation and the efficiency with which water and other volatiles can be delivered to the nascent planets.

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