Artist's conception of Dawn approaching Ceres (left) and Vesta (right). NASA is beginning the final preparations for next Wednesday's launch of the Dawn probe, aboard a Delta II rocket. The Dawn probe, costing over  $250 million, will visit the dwarf planet Ceres and the asteroid Vesta. The launch was originally planned for mid-June, however due to a damaged crate, shipping delays, and a damaged solar panel, NASA chose to delay it until now. Last week the spacecraft was delivered to the launch pad, and engineers performed tests to ensure that it is ready for launch. Today, the payload fairings were installed, and the probe is ready for its launch next week onto its 5 billion kilometer (3.2 billion mile) mission. As the Delta II launches, three stages of rockets will propel the probe towards its first target. With the help of ion thrusters, it will reach Mars in mid-2009. Using Mars' gravity, the probe will speed up and proceed towards the first asteroid, Vesta, in late 2011. After orbiting for 7 months, it will leave Vesta in mid-2012, and arrive at Ceres in 2015. After making scans of Ceres, it will enter an orbit around Ceres that will ensure that it does not impact the asteroid for half a century. This is required due to the United Nations' “Outer Space Treaty”, which states that “harmful contamination” of these asteroids must be avoided.
Artist's conception of Dawn approaching Ceres (left) and Vesta (right). NASA is beginning the final preparations for next Wednesday's launch of the Dawn probe, aboard a Delta II rocket. The Dawn probe, costing over US $250 million, will visit the dwarf planet Ceres and the asteroid Vesta. The launch was originally planned for mid-June, however due to a damaged crate, shipping delays, and a damaged solar panel, NASA chose to delay it until now. Last week the spacecraft was delivered to the launch pad, and engineers performed tests to ensure that it is ready for launch. Today, the payload fairings were installed, and the probe is ready for its launch next week onto its 5 billion kilometer (3.2 billion mile) mission. As the Delta II launches, three stages of rockets will propel the probe towards its first target. With the help of ion thrusters, it will reach Mars in mid-2009. Using Mars' gravity, the probe will speed up and proceed towards the first asteroid, Vesta, in late 2011. After orbiting for seven months, it will leave Vesta in mid-2012, and arrive at Ceres in 2015. After making scans of Ceres, it will enter an orbit around Ceres that will ensure that it does not impact the asteroid for half a century. This is required due to the United Nations' “Outer Space Treaty”, which states that “harmful contamination” of these asteroids must be avoided.
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