Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...237.1349m&link_type=abstract
Science (ISSN 0036-8075), vol. 237, Sept. 11, 1987, p. 1349-1351. NSF-supported research.
Astronomy and Astrophysics
Astronomy
37
Charon, Ice, Infrared Spectra, Planetary Composition, Planetary Surfaces, Water, Astronomical Spectroscopy, Occultation, Radiant Flux Density, Spectral Signatures, Pluto, Satellites, Charon, Surface, Composition, Water Ice, Infrared, Wavelengths, Spectra, Methane, Depletion, Color, Diagrams, Flux, Albedo, Comparisons, Optical Properties, Reflectance, Spectrometry, Earth-Based Observations, Photometry, Telescope Methods, Ice
Scientific paper
The 3 March 1987 Charon occultation by Pluto was observed in the infrared at 1.5, 1.7, 2.0, and 2.35 micrometers. Subtraction of fluxes measured between second and third contacts from measurements made before and after the event has yielded individual spectral signatures for each body at these wavelengths. Charon's surface appears depleted in methane relative to Pluto. Constancy of flux at 2.0 micrometers throughout the event shows that Charon is effectively black at this wavelength, which is centered on a very strong water absorption band. Thus, the measurements suggest the existence of water ice on Pluto's moon.
Lebofsky Larry A.
Marcialis Robert Louis
Rieke George H.
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