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Io - An intense brightening near 5 micrometers (1979)

Pollack, J. B. ; Bregman, J. D. ; Witteborn, F. C.

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Publication Date: 2011-08-17

Description: Spectrophotometric observations of the Jovian satellite Io on February 20 and 21, 1978, (Universal Time) were made from 1.2 to 5.4 micrometers. Io's brightness at 4.7 to 5.4 micrometers was found to be three to five times greater at an orbital phase angle of 68 deg than at orbital phase angles of 23 deg (5.5 hours before the brightening) and 240 deg (20 hours after the brightening). Since the 5-micrometer albedo of Io is near unity under ordinary conditions, the observed transient phenomenon must have been the result of an emission mechanism. Although several such mechanisms were examined, the actual choice is not clear.

Keywords: LUNAR AND PLANETARY EXPLORATION

Type: Science; 203; Feb. 16

Format: text

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