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We observed the Mars Trojan asteroids (5261) Eureka and (101429) 1998 VF31and the candidate Mars Trojan 2001 FR127 at 11.2 and 18.1 microns usingMichelle on the Gemini North telescope. We derive diameters of 1.28, 0.78, and<0.52 km, respectively, with corresponding geometric visible albedos of 0.39,0.32, and >0.14. The albedos for Eureka and 1998 VF31 are consistent with thetaxonomic classes and compositions (S(I)/angritic and S(VII)/achrondritic,respectively) and implied histories presented in a companion paper by Rivkin etal. Eureka's surface likely has a relatively high thermal inertia, implying athin regolith that is consistent with predictions and the small size that wederive.

Albedos and diameters of three Mars Trojan asteroids