This picture of asteroid 951 Gaspra is a mosaic of two images taken by the Galileo spacecraft from a range of 5,300 kilometers (3,300 miles), some 10 minutes before closest approach on October 29, 1991.
http://nssdc.gsfc.nasa.gov/imgcat/html/object_page/gal_p40449.html
1991-10-29
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