@article{61a45f9cf1604058a325b0095ccd32fa,
title = "Albedos and diameters of three Mars Trojan asteroids",
abstract = "We observed the Mars Trojan Asteroids (5261) Eureka and (101429) 1998 VF31 and the candidate Mars Trojan 2001 FR127 at 11.2 and 18.1 microns using Michelle 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 the taxonomic classes and compositions (S(I)/angritic and S(VII)/achondritic, respectively) and implied histories presented in a companion paper by Rivkin et al. Eureka's surface likely has a relatively high thermal inertia, implying a thin regolith that is consistent with predictions and the small size that we derive.",
keywords = "Infrared observations, Regoliths, Trojan asteroids",
author = "Trilling, {David E.} and Rivkin, {Andrew S.} and Stansberry, {John A.} and Spahr, {Timothy B.} and Crudo, {Richard A.} and Davies, {John K.}",
note = "Funding Information: We thank Marco Delb{\'o} and Josh Emery for thoughtful, thorough, and helpful reviews. We thank Ed Olszewski and Grant Williams for their assistance with making 90prime observations. Marc Buie developed the IDL moving object pipeline that was used to detect and measure the position for 2001 FR 127 . Larry Wasserman helped with the modification of this pipeline for other observational platforms and also provided useful input on positional errors for planning the 2001 FR 127 recovery observations. We thank Chad Engelbracht for helpful discussions about color corrections and Kevin Volk (Gemini) for providing the color corrections (isophotal wavelengths) for Michelle. We thank Tom Geballe, Scott Fisher, and Chad Trujillo (Gemini) and Rachel Mason and Michael Merrill (NOAO) for help with planning and carrying out the Gemini observations. This work is based in part on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil) and CONICET (Argentina). The data presented here were obtained under Gemini program GN-2005A-Q-47. We used the JPL Solar System Dynamics group's Horizons tool to plan our observations and analyze our results. This manuscript was prepared using the Elsevier/Icarus LaTeX template created by Ross Beyer et al. Finally, we are grateful to the indigenous people of Hawai{\textquoteleft}i for allowing astronomers to use their sacred mountain.",
year = "2007",
month = dec,
day = "15",
doi = "10.1016/j.icarus.2007.08.002",
language = "English (US)",
volume = "192",
pages = "442--447",
journal = "Icarus",
issn = "0019-1035",
publisher = "Academic Press Inc.",
number = "2",
}