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The two faces of IapetusRadiometric and photometric observations of Iapetus are described, and a model is developed for the albedo distribution consistent with the visual light curves, color variations, and radiometric flux curve. The 20-micron infrared observations show that the radiometric variation differs by about 180 deg in phase from the visual light curve and has a peak-to-peak amplitude of about a factor of two, while the linear phase coefficient of the light curve varies, as the satellite rotates, from 0.028 to 0.068 mag/deg. Determination of the albedo distribution is described, and it is found to be characterized by a dark area covering most of the leading hemisphere, a bright trailing hemisphere, and a bright south polar cap. The radius is approximated as 800 to 850 km, and the mean geometric albedos for the light and dark faces are estimated as 0.35 and 0.07, respectively.
Document ID
19750040967
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Morrison, D.
Jones, T. J.
Cruikshank, D. P.
Murphy, R. E.
(Hawaii, University Honolulu, Hawaii, United States)
Date Acquired
August 8, 2013
Publication Date
February 1, 1975
Publication Information
Publication: Icarus
Volume: 24
Subject Category
Lunar And Planetary Exploration
Accession Number
75A25039
Funding Number(s)
CONTRACT_GRANT: NGL-12-001-057
Distribution Limits
Public
Copyright
Other

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