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(abstract) Observation by Clementine of a Hugh Opposition Surge on the Moon at Very Small Solar Phase Angles

Show simple item record Buratti, B.J. en_US Wang, M.C. en_US 2004-10-05T05:38:17Z 2004-10-05T05:38:17Z 1994-12-05 en_US
dc.identifier.citation San Francisco, CA en_US
dc.identifier.clearanceno 94-1218 en_US
dc.description.abstract The Clementine mission enabled the first quantative observations of the Moon at very small solar phase angles. It is well established from Earth-based observations that the Moon exhibits a non-linear increase in brightness as its face becomes fully illuminated to a terrestrial observer. Because the models of the opposition effect are sensitive indicators of surfical compaction state and particle size, observations at small solar phase angles are important to obtain. A recent model for optical coherent backscatter seeks to explain a narrow opposition spike at very small phase angles (< 1 degree) seen on several icy satellites , including Europa, Icarus 90, and Oberon . Over 90 images of the Moon's surface at phase angles less than 0.5° (the minimum phase angle observable from Earth due to the Moon's angular size) were obtained by the Clementine spacecraft. Our analysis of these images shows the moon exhibits a surge in brightness of approximately 20% below 0.25°, comparable to the values observed on icy satellites. No color dependence was detected in the lunar phase curve below 2 degrees. en_US
dc.format.extent 21902 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject.other Moon Clementine solar phase angles opposition effect optical coherent backscatter increase in brightness opposition surge surface compaction state partical size icy satellites Europa Icarus 90 Oberon lunar phase curve en_US
dc.title (abstract) Observation by Clementine of a Hugh Opposition Surge on the Moon at Very Small Solar Phase Angles en_US

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