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Vesta's SisterAug 21, 2012 The Dawn spacecraft will arrive at Ceres in August of 2015
Ceres is the largest asteroid in the Solar System. The most recent measurement from the Hubble Space Telescope puts it at approximately 975 kilometers in mean diameter. It is so large that it is roughly spherical, and has recently been classified as a dwarf planet, along with Pluto and several recently discovered Trans-Neptunian Objects like Sedna.
Ceres compares with Saturn’s moons Tethys (1072 kilometers) and Dione (1120 kilometers) in overall size and density, so it is likely that its features will be similar to those bodies. Its assumed density, based on gravitational perturbations on other asteroids likePallas, means that it should be covered with a thick ice layer. There might also be a layer of silicate rock beneath the ice, since Vesta, a smaller sister asteroid, is primarily composed of silicates................. Quoting: observation [ link to www.thunderbolts.info] so dawn comes to ceres in aug.2015 In ancient Roman religion, Ceres was a goddess of agriculture, grain crops, fertility and motherly relationships.......... Quoting: observation [ link to en.wikipedia.org]
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