Composition of the L5 Mars Trojans: Neighbors, not siblings

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

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Mars is the only terrestrial planet known to have Trojan (co-orbiting) asteroids, with a confirmed population of at least 4 objects. The origin of these objects is not known; while several have orbits that are stable on Solar System timescales, work by Rivkin et al. [Rivkin, A.S., Binzel, R.P., Howell, E.S., Bus, S.J., Grier, J.A., 2003. Icarus 165, 349-354] showed they have compositions that suggest separate origins from one another. We have obtained infrared (0.8-2.5 μm) spectroscopy of the two largest L5 Mars Trojans, and confirm and extend the results of Rivkin et al. We suggest that the differentiated angrite meteorites are good spectral analogs for 5261 Eureka, the largest Mars Trojan. Meteorite analogs for 101429 1998 VF31 are more varied and include primitive achondrites and mesosiderites.

Original languageEnglish (US)
Pages (from-to)434-441
Number of pages8
Issue number2
StatePublished - Dec 15 2007


  • Asteroids
  • Trojan asteroids
  • composition

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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