Composition of the L5 Mars Trojans: Neighbors, not Siblings - AstrophysicsReport as inadecuate

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Abstract: Mars is the only terrestrial planet known to have Tro jan co-orbitingasteroids, with a confirmed population of at least 4 objects. The origin ofthese objects is not known; while several have orbits that are stable onsolar-system timescales, work by Rivkin et al. 2003 showed they havecompositions that suggest separate origins from one another. We have obtainedinfrared 0.8-2.5 micron spectroscopy of the two largest L5 Mars Tro jans, andconfirm and extend the results of Rivkin et al. 2003. We suggest that thedifferentiated angrite meteorites are good spectral analogs for 5261 Eureka,the largest Mars Trojan. Meteorite analogs for 101429 1998 VF31 are more variedand include primitive achondrites and mesosiderites.

Author: Andrew S. Rivkin, David E. Trilling, Cristina A. Thomas, Francesca DeMeo, Timothy B. Spahr, Richard P. Binzel


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