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The Permanently Shadowed Regions of Dwarf Planet CeresCeres has only a small spin axis tilt (4 deg), and craters near its rotational poles can experience permanent shadow and trap volatiles, as is the case on Mercury and on Earth's Moon. Topography derived from stereo imaging by the Dawn spacecraft is used to calculate direct solar irradiance that defines the extent of the permanently shadowed regions (PSRs). In the northern polar region, PSRs cover approximately 1800 sq km or 0.13% of the hemisphere, and most of the PSRs are cold enough to trap water ice over geological time periods. Based on modeling of the water exosphere, water molecules seasonally reside around the winter pole and ultimately an estimated 0.14% of molecules get trapped. Even for the lowest estimates of the amount of available water, this predicts accumulation rates in excess of loss rates, and hence, there should be fresh ice deposits in the cold traps.
Document ID
20160009144
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Schorghofer, Norbert (Hawaii Univ. Honolulu, HI, United States)
Mazarico, Erwan (NASA Goddard Space Flight Center Greenbelt, MD United States)
Platz, Thomas (Max-Planck Inst. for Solar System Research Germany)
Preusker, Frank (Deutsches Zentrum fuer Luft- und Raumfahrt e.V. Berlin, Germany)
Schroeder, Stefan E. (Deutsches Zentrum fuer Luft- und Raumfahrt e.V. Berlin, Germany)
Raymond, Carol A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Russell, Christopher T. (California Univ. Los Angeles, CA, United States)
Date Acquired
July 19, 2016
Publication Date
July 6, 2016
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
GSFC-E-DAA-TN33766
Funding Number(s)
CONTRACT_GRANT: NNX15AI38G
Distribution Limits
Public
Copyright
Other
Keywords
CERES
PSR
Craters