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Imaging Mercury's polar deposits during MESSENGER's low‐altitude campaign
Author(s) -
Chabot Nancy L.,
Ernst Carolyn M.,
Paige David A.,
Nair Hari,
Denevi Brett W.,
Blewett David T.,
Murchie Scott L.,
Deutsch Ariel N.,
Head James W.,
Solomon Sean C.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl070403
Subject(s) - mercury (programming language) , polar , altitude (triangle) , geology , astrobiology , geophysics , geodesy , astronomy , physics , computer science , programming language , geometry , mathematics
Images obtained during the low‐altitude campaign in the final year of the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission provide the highest‐spatial‐resolution views of Mercury's polar deposits. Images for distinct areas of permanent shadow within 35 north polar craters were successfully captured during the campaign. All of these regions of permanent shadow were found to have low‐reflectance surfaces with well‐defined boundaries. Additionally, brightness variations across the deposits correlate with variations in the biannual maximum surface temperature across the permanently shadowed regions, supporting the conclusion that multiple volatile organic compounds are contained in Mercury's polar deposits, in addition to water ice. A recent large impact event or ongoing bombardment by micrometeoroids could deliver water as well as many volatile organic compounds to Mercury. Either scenario is consistent with the distinctive reflectance properties and well‐defined boundaries of Mercury's polar deposits and the presence of volatiles in all available cold traps.