File:PIA00040 Umbrielx2.47.jpg

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PIA00040_Umbrielx2.47.jpg(586 × 586 pixels, file size: 94 KB, MIME type: image/jpeg)

Summary

Description
English: Original Caption Released with Image: The southern hemisphere of Umbriel displays heavy cratering in this Voyager 2 image, taken Jan. 24, 1986, from a distance of 557,000 kilometers (346,000 miles). This frame, taken through the clear-filter of Voyager's narrow-angle camera, is the most detailed image of Umbriel, with a resolution of about 10 km (6 mi). Umbriel is the darkest of Uranus' larger moons and the one that appears to have experienced the lowest level of geological activity. It has a diameter of about 1,200 km (750 mi) and reflects only 16 percent of the light striking its surface; in the latter respect, Umbriel is similar to lunar highland areas. Umbriel is heavily cratered but lacks the numerous bright ray craters seen on the other large Uranian satellites; this results in a relatively uniform surface albedo (reflectivity). The prominent crater on the terminator (upper right) is about 110 km (70 mi) across and has a bright central peak. The strangest feature in this image (at top) is a curious bright ring, the most reflective area seen on Umbriel. The ring is about 140 km (90 miles) in diameter and lies near the satellite's equator. The nature of the ring is not known, although it might be a frost deposit, perhaps associated with an impact crater. Spots against the black background are due to 'noise' in the data. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.

The original NASA image has been modified by cropping, increasing the linear pixel density by a factor of 2.47, and converting from .TIF to .JPG format.
Date
Source http://photojournal.jpl.nasa.gov/catalog/PIA00040
Author NASA / Jet Propulsion Lab
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This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA00040.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information.

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Licensing

Public domain
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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  • Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}.
  • The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]
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File history

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Date/Time Thumbnail Dimensions User Comment
current 08:52, 19 November 2015 Thumbnail for version as of 08:52, 19 November 2015 586 × 586 (94 KB) PlanetUser Cropped 7 % horizontally and 7 % vertically using CropTool with precise mode.
06:25, 3 April 2011 Thumbnail for version as of 06:25, 3 April 2011 628 × 628 (95 KB) WolfmanSF A bit more cropping
06:05, 3 April 2011 Thumbnail for version as of 06:05, 3 April 2011 660 × 660 (96 KB) WolfmanSF Further cropping
05:50, 3 April 2011 Thumbnail for version as of 05:50, 3 April 2011 740 × 740 (98 KB) WolfmanSF {{Information |Description ={{en|1=The southern hemisphere of Umbriel displays heavy cratering in this Voyager 2 image, taken Jan. 24, 1986, from a distance of 557,000 kilometers (346,000 miles). This frame, taken through the clear-filter of Voyager's

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