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IRAS serendipitous survey observations of Pluto and Charon
On Aug. 16, 1983, the Infrared Astronomical Satellite made two separatepointed observations of Pluto and its moon Charon. Because of the smallangular displacement of the system between the times of measurement, thePluto-Charon system was identified as a source in the SerendipitousSurvey (SSC 14029+0518). Detections were made at 60 and 100 micrometerswith color-corrected flux densities of 581 + or - 58 and 721 + or - 123millijanskys, respectively. Pluto is best described as having a darkequatorial band, and brighter polar caps of methane ice extending to +or - 45 deg latitude, at most. An upper limit of approximately 9meter-amagats is placed on the column abundance of a methane atmosphereon Pluto, which is comparable to recent upper limits based onindependent ground-based spectroscopy.
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