In this image, the Dawn spacecraft's three xenon electrostatic ion thrusters can be seen emitting ionized xenon's characteristic
In this image, the Dawn spacecraft's three xenon electrostatic ion thrusters can be seen emitting ionized xenon's characteristic blue/magenta glow, gently propelling the probe toward the dwarf planet Ceres. While the ion engines have relatively low specific thrust (about equal to the weight of a few sheets of paper), they can operate continuously for long periods making efficient use of the approximately 1,000 pounds of xenon propellant onboard. The wing-like solar arrays produce about 1,300 watts for probe's propulsion and other electrical systems. While no close-up observations have yet been made of Ceres itself, here it is rendered as appearing similar to a much smaller version of the Earth's Moon, heavily cratered with the addition of surface water ice and hypothesized plumes of ice crystals from water geysers on its surface. In February 2015 the unmanned Dawn spacecraft is scheduled to arrive at the dwarf planet Ceres. The 65 foot long, ton probe was launched from the Earth in 2007, passed Mars in 2009, and went into orbit around the protoplanet Vesta in July 2011 where it stayed until September 2012. Once in orbit around Ceres, Dawn is expected to operate for about a year making observations of this largest object in the asteroid belt.
Size: 5100px × 3570px
Photo credit: © Walter Myers / Stocktrek Images / Alamy / Afripics
License: Royalty Free
Model Released: No
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