DLR Institute of Planetary Research - 23.01.2012 - 3-D image of Vesta’s eastern hemisphere

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23.01.2012 - 3-D image of Vesta’s eastern hemisphere

This 3-D image, called an anaglyph, shows the topography of Vesta’s eastern hemisphere. To create this anaglyph, two differently colored images are superimposed with an offset to create depth. When viewed through red-blue glasses this anaglyph shows a 3-D view of Vesta’s surface. The images used to generate the two differently colored images that make up this anaglyph were obtained during the approach phase of NASA’s Dawn mission in July 2011. At the time the distance from Dawn to Vesta was about 5,200 kilometers (3,200 miles), which results in an image resolution of about 500 meters (1,600 feet) per pixel. The depth effect or topography differences in this anaglyph were calculated from the shape model of Vesta. A number of Vesta’s large features are clear in this anaglyph. Firstly, the equatorial troughs are visible around Vesta’s equator. These troughs encircle most of the asteroid and are up to 20 kilometers (12 miles) wide. Secondly, to the north of these troughs there are a number of highly degraded, old, large craters. Vesta’s heavily cratered nature is clear from this anaglyph because younger, fresher craters are overlain onto many sets of older, more degraded craters. Due to Vesta’s angle towards the Sun the northernmost part of Vesta has yet to be illuminated and studied and is shown in shadow in this anaglyph. Finally, in the southern hemisphere there are generally fewer craters than in the northern hemisphere. Also visible protruding out from Vesta’s south polar region is a side view of the central complex of the Rheasilvia impact basin.

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