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W. M. Grundy,1*B. J. Buratti,2A. F. Cheng,3J. P. Emery,4A. Lunsford,5W. B. McKinnon,6J. M. Moore,7S. F. Newman,2C. B. Olkin,8D. C. Reuter,5P. M. Schenk,9J. R. Spencer,8S. A. Stern,10H. B. Throop,8H. A. Weaver3 the New Horizons team
The New Horizons spacecraft observed Jupiter's icy satellitesEuropa and Ganymede during its flyby in February and March 2007at visible and infrared wavelengths. Infrared spectral imagesmap H2O ice absorption and hydrated contaminants, bolsteringthe case for an exogenous source of Europa's "non-ice" surfacematerial and filling large gaps in compositional maps of Ganymede'sJupiter-facing hemisphere. Visual wavelength images of Europaextend knowledge of its global pattern of arcuate troughs andshow that its surface scatters light more isotropically thanother icy satellites.
1 Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA. 2 Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA. 3 Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA. 4 SETI Institute/NASA Ames Research Center, 515 North Whisman Road, Mountain View, CA 94043, USA. 5 NASA Goddard Space Flight Center, Code 693, Greenbelt, MD 20771, USA. 6 Department of Earth and Planetary Science, Washington University, Campus Box 1169, 1 Brookings Drive, St. Louis, MO 63130, USA. 7 NASA Ames Research Center, MS 245-3, Moffett Field, CA 94035, USA. 8 Department of Space Studies, Southwest Research Institute, 1050 Walnut Street, Suite 300, Boulder, CO 80302, USA. 9 Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston, TX 77058, USA. 10 NASA Science Mission Directorate, NASA Head-quarters, Washington, DC 20546, USA.
* To whom correspondence should be addressed. E-mail: w.grundy{at}lowell.edu
