NASA NTRS · 19790047502
Surface composition of Pluto
Abstract
Broadband (J, H, K and L) and narrowband (1.5- to 3.7-micron) infrared photometry of Pluto has been conducted in order to check previous ambiguous observations of methane frost on the planet's surface. In detail, the match between a laboratory spectrum of methane frost and the observed spectrum of Pluto is not good. Nevertheless, the photometric observations suggest the presence of methane in some form.
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Lebofsky, L. A., Lebofsky, M. J., Rieke, G. H.. 1979-03-01. Surface composition of Pluto. https://ntrs.nasa.gov/citations/19790047502
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