A new spectrum of Triton near the time of the Voyager encounter

Details A new spectrum of Triton near the time of the Voyager encounter A new spectrum of Triton near the time of the Voyager encounter

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...93..379g&link_type=abstract

Icarus (ISSN 0019-1035), vol. 93, Oct. 1991, p. 379-385.

Physics

9

Absorption Spectra, Satellite Surfaces, Spectral Bands, Triton, Ultraviolet Spectra, Grain Size, Methane, Voyager 2 Spacecraft

Scientific paper

A 5200-10,000 A spectrum of Triton that was telescopically obtained during the summer of 1989, just before the Voyager II encounter with the Neptune system, exhibits a measurable 8900 A CH4 ice absorption band. A combination of these data with those of Voyager indicates that the absorption is caused solely by Triton surface CH4 ice. A Hapke-type model for the Triton spectrum (1) sets a 20-micron lower limit on the CH4 ice's mean grain size (although it is suspected that actual grain size is closer to 100 microns), and (2) indicates that CH4 ice is widely distributed on the southern-hemisphere surface of Triton.

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