NASA Dawn spacecraft and probe begins journey from asteroid to dwarf planet

WASHINGTON, 11 Sept. 2012. NASA's Dawn spacecraft, to become the first probe to orbit and study two distant destinations, started its 2.5-year, 3-billion-mile journey from the giant asteroid Vesta to dwarf planet Ceres.

Dawn will explore the two most massive objects in the main asteroid belt and help scientists answer questions about the formation of the solar system. The spacecraft arrived at Vesta in July 2011 and will reach Ceres in early 2015.

The spacecraft gently spiraled away from Vesta using a special, hyper-efficient ion propulsion system, which uses electricity to ionize xenon to generate thrust. The 12-inch-wide ion thrusters provide less power than conventional engines but can maintain thrust for months at a time.

"Thrust is engaged and we now are climbing away from Vesta atop a blue-green pillar of xenon ions," says Marc Rayman, Dawn's chief engineer and mission director, at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Calif. "We are feeling somewhat wistful about concluding a fantastically productive and exciting exploration of Vesta, but now we have our sights set on dwarf planet Ceres."

Dawn provided close-up views of and unprecedented detail about Vesta, the giant asteroid. Findings revealed that the asteroid had completely melted in the past, forming a layered body with an iron core. The spacecraft also revealed the collisions Vesta suffered in its southern hemisphere. The asteroid survived two colossal impacts in the last 2 billion years. Without Dawn, scientists would not have known about the dramatic troughs sculpted around Vesta, which are ripples from the two south polar impacts.

"We went to Vesta to fill in the blanks of our knowledge about the early history of our solar system," says Christopher Russell, Dawn's principal investigator, based at the University of California, Los Angeles (UCLA). "Dawn has filled in those pages and more, revealing to us how special Vesta is as a survivor from the earliest days of the solar system. We now can say with certainty that Vesta resembles a small planet more closely than a typical asteroid."

JPL manages the mission to Vesta and Ceres for NASA's Science Mission Directorate in Washington. Dawn is a project of the directorate's Discovery Program, which is managed by NASA's Marshall Space Flight Center in Huntsville, Ala.

UCLA is responsible for the overall Dawn mission science. Orbital Sciences Corp. of Dulles, Va., designed and built the spacecraft. The German Aerospace Center, the Max Planck Institute for Solar System Research, the Italian Space Agency, and the Italian National Astrophysical Institute are part of the mission's team.

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