Space

September 4, 2012

Dawn spacecraft prepares for trek toward dwarf planet

NASA’s Dawn spacecraft is on track to become the first probe to orbit and study two distant destinations to help scientists answer questions about the formation of our solar system.

The spacecraft is scheduled to leave the giant asteroid Vesta Sept. 5 to start its 2 1/2-year journey to the dwarf planet Ceres.

Dawn began its 3-billion-mile odyssey to explore the two most massive objects in the main asteroid belt in 2007. Dawn arrived at Vesta in July 2011 and will reach Ceres in early 2015. These two members of the asteroid belt have been witness to much of our solar system’s history.

The valuable evidence Dawn gathered from examining the first of these cosmic fossils up close improved our understanding of asteroids and provided context for a future human mission to visit an asteroid.

The spacecraft will spiral away from Vesta as gently as it arrived, using a special, hyper-efficient system called ion propulsion. The ion propulsion system 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,” said Marc Rayman, Dawn’s chief engineer and mission director, at NASA’s Jet Propulsion Laboratory 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 Vesta and unprecedented detail about 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,” said Christopher Russell, Dawn’s principal investigator, based at the University of California, Los Angeles. “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.

 




All of this week's top headlines to your email every Friday.


 
 

 
Virgin Galactic photograph

NTSB concludes SpaceShipTwo flight test accident investigation

Virgin Galactic photograph WhiteKnightTwo and the first SpaceShipTwo during a captive carry test flight over the Mojave Desert. MOJAVE, Calif.–The National Transportation Safety Board has concluded the investigation of th...
 
 

Headlines July 27, 2015

News: U.S.-Turkey deal aims to create de facto ‘safe zone’ in northwest Syria¬†– Turkey and the United States have agreed on the outlines of a de facto “safe zone” along the Turkey-Syria border under the terms of a deal that is expected to significantly increase the scope and pace of the U.S.-led air war against...
 
 

News Briefs July 27, 2015

Putin OKs maritime code calling for strong Atlantic presence Russian President Vladimir Putin has approved a new version of the country’s maritime doctrine that calls for maintaining a strong Russian presence in the Atlantic Ocean amid concerns about NATO expansion. The doctrine, which covers naval, merchant marine and scientific maritime issues, also adds the Antarctic...
 

 
Army photograph by SFC Walter E. van Ochten

U.S., Ukraine, Romania, Bulgaria train together at Rapid Trident 2015

Army photograph by SFC Walter E. van Ochten U.S. soldiers, of the 3rd Platoon, 615th Military Police Company, 709th Military Police Battalion, react as they conduct reacting to contact training as part of their situational trai...
 
 
nasa-astronaut

Astronaut Stephen Frick retires from NASA

Astronaut Stephen Frick has retired from NASA to accept a position in the private sector. Frick, who flew as both a shuttle pilot and commander, left the Agency July 13. Steve has been a great asset to the astronaut office and ...
 
 
Army photograph by Sgt. Juana M. Nesbitt

Estonian, US forces receive new jump wings

Army photograph by Sgt. Juana M. Nesbitt Pvt. Kalmer Simohov, of Parnu, a volunteer with the Estonian Defense League, receives his U.S. Army Airborne wings following the joint airborne operations exercise at a drop zone in Nurm...
 




0 Comments


Be the first to comment!


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>