Olivine Composition of the Mars Trojan 5261 Eureka: Spitzer IRS Data

Details Olivine Composition of the Mars Trojan 5261 Eureka: Spitzer IRS Data Olivine Composition of the Mars Trojan 5261 Eureka: Spitzer IRS Data

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1199l&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1199

Computer Science

Scientific paper

The largest Mars trojan, 5261 Eureka, is one of two prototype "Sa" asteroids in the Bus-Demeo taxonomy [1]. Analysis of its visible/near-IR spectrum [2] led to the conclusion that it might represent either an angritic analog or an olivine-rich composition such as an R chondrite. Spitzer IRS data (5-30 μm) have enabled us to resolve this ambiguity. The thermal-IR spectrum exhibits strong olivine reststrahlen features consistent with a composition of Fo60-70. Laboratory spectra of R chondrites, brachinites, and chassignites are dominated by similar features.

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