Ninety minutes after Dione on 11 October 2005, Cassini passed Telesto at a range of 9,500 kilometres. At 24 kilometres in size, this Trojan satellite of Tethys was too small in the Voyager discovery imagery for surface detail to be resolved. This new imagery showed the surface to be remarkably smooth - apart from the large 'rocks' that traced the rims of craters, as if they had been left in situ as the finer material slid downslope into the cavities. This suggested an usually thick blanket of regolith for such a small predominantly icy body.
Views of Telesto taken on 11 October 2005 (left) and 25 December 2005.
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