File:PIA19216.jpg
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
Size of this preview: 610 × 600 pixels. Other resolutions: 244 × 240 pixels | 488 × 480 pixels | 781 × 768 pixels | 1,042 × 1,024 pixels | 1,992 × 1,958 pixels.
Original file (1,992 × 1,958 pixels, file size: 1.05 MB, MIME type: image/jpeg)
File information
Structured data
Captions
DescriptionPIA19216.jpg |
English: This mosaic of Caloris basin is an enhanced-color composite overlain on a monochrome mosaic featured in a previous post. The color mosaic is made up of WAC images obtained when both the spacecraft and the Sun were overhead, conditions best for discerning variations in albedo, or brightness. The monochrome mosaic is made up of WAC and NAC images obtained at off-vertical Sun angles (i.e., high incidence angles) and with visible shadows so as to reveal clearly the topographic form of geologic features. The combination of the two datasets allows the correlation of geologic features with their color properties. In portions of the scene, color differences from image to image are apparent. Ongoing calibration efforts by the MESSENGER team strive to minimize these differences.
Caloris basin has been flooded by lavas that appear orange in this mosaic. Post-flooding craters have excavated material from beneath the surface. The larger of these craters have exposed low-reflectance material (blue in this mosaic) from beneath the surface lavas, likely giving a glimpse of the original basin floor material. Analysis of these craters yields an estimate of the thickness of the volcanic layer: 2.5-3.5 km (1.6-2.2 mi.).
|
||||||
Date | |||||||
Source | http://photojournal.jpl.nasa.gov/catalog/PIA19216 (image link) | ||||||
Author | NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington | ||||||
Permission (Reusing this file) |
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 12:16, 9 May 2015 | 1,992 × 1,958 (1.05 MB) | Jcpag2012 (talk | contribs) | Transferred from http://photojournal.jpl.nasa.gov/jpeg/PIA19216.jpg |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
Hidden categories: