Space

September 20, 2013

NASA’s deep space comet hunter mission comes to an end

After almost 9 years in space that included an unprecedented July 4th impact and subsequent flyby of a comet, an additional comet flyby, and the return of approximately 500,000 images of celestial objects, NASA’s Deep Impact mission has ended.

The project team at NASA’s Jet Propulsion Laboratory in Pasadena, Calif., has reluctantly pronounced the mission at an end after being unable to communicate with the spacecraft for over a month. The last communication with the probe was Aug. 8. Deep Impact was history’s most traveled comet research mission, going about 4.7 billion miles.

“Deep Impact has been a fantastic, long-lasting spacecraft that has produced far more data than we had planned,” said Mike A’Hearn, the Deep Impact principal investigator at the University of Maryland in College Park. “It has revolutionized our understanding of comets and their activity.”

Deep Impact successfully completed its original bold mission of six months in 2005 to investigate both the surface and interior composition of a comet, and a subsequent extended mission of another comet flyby and observations of planets around other stars that lasted from July 2007 to December 2010. Since then, the spacecraft has been continually used as a space-borne planetary observatory to capture images and other scientific data on several targets of opportunity with its telescopes and instrumentation.

Launched in January 2005, the spacecraft first traveled about 268 million miles to the vicinity of comet Tempel 1. On July 3, 2005, the spacecraft deployed an impactor into the path of comet to essentially be run over by its nucleus on July 4. This caused material from below the comet’s surface to be blasted out into space where it could be examined by the telescopes and instrumentation of the flyby spacecraft.† Sixteen days after that comet encounter, the Deep Impact team placed the spacecraft on a trajectory to fly back past Earth in late December 2007 to put it on course to encounter another comet, Hartley 2 in November 2010.

“Six months after launch, this spacecraft had already completed its planned mission to study comet Tempel 1,” said Tim Larson, project manager of Deep Impact at JPL. “But the science team kept finding interesting things to do, and through the ingenuity of our mission team and navigators and support of NASAís Discovery Program, this spacecraft kept it up for more than eight years, producing amazing results all along the way.”

The spacecraft’s extended mission culminated in the successful flyby of comet Hartley 2 on Nov. 4, 2010. Along the way, it also observed six different stars to confirm the motion of planets orbiting them, and took images and data of the Earth, the Moon and Mars. These data helped to confirm the existence of water on the Moon, and attempted to confirm the methane signature in the atmosphere of Mars. One sequence of images is a breathtaking view of the Moon transiting across the face of Earth.

The spacecraft’s extended mission culminated in the successful flyby of comet Hartley 2 on Nov. 4, 2010. In January 2012, Deep Impact performed imaging and accessed the composition of distant comet C/2009 P1 (Garradd). It took images of comet ISON this year and collected early images of comet ISON in June.

After losing contact with the spacecraft last month, mission controllers spent several weeks trying to uplink commands to reactivate its onboard systems. Although the exact cause of the loss is not known, analysis has uncovered a potential problem with computer time tagging that could have led to loss of control for Deep Impact’s orientation. That would then affect the positioning of its radio antennas, making communication difficult, as well as its solar arrays, which would in turn prevent the spacecraft from getting power and allow cold temperatures to ruin onboard equipment, essentially freezing its battery and propulsion systems.

Despite this unexpected final curtain call, Deep Impact already achieved much more than ever was envisioned,” said Lindley Johnson, the Discovery Program Executive at NASA Headquarters, and the Program Executive for the mission since a year before it launched. “Deep Impact has completely overturned what we thought we knew about comets and also provided a treasure trove of additional planetary science that will be the source data of research for years to come.

The mission is part of the Discovery Program managed at NASA’s Marshall Space Flight Center in Huntsville, Ala. JPL manages the Deep Impact mission for NASA’s Science Mission Directorate in Washington. Ball Aerospace & Technologies Corp. of Boulder, Colo., built the spacecraft.

To find out more about Deep Impact’s scientific results, visit http://go.nasa.gov/19ki9LG.




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


 
 

 

Headlines December 19, 2014

News: SpaceX’s attempt to land rocket on floating barge postponed - It’s set to be one of the most groundbreaking moments in humanity’s six decades of space exploration. Obama signs $1.1 trillion spending bill into law - President Obama signed the $1.1 trillion federal spending measure into law Dec. 16, officially ending any threat of a government...
 
 

News Briefs December 19, 2014

Trial set for ex-Navy engineer in military secrets case A former Navy civilian engineer is scheduled to stand trial next summer on charges of trying to steal aircraft carrier schematics. Media outlets report that 35-year-old Mostafa Awwad of Yorktown, Va., pleaded not guilty Dec. 17 to two counts of attempted exportation of defense articles and...
 
 
Army photograph by C. Todd Lopez

Army to launch cruise missile-detecting aerostat at Aberdeen Proving Ground

Army photograph by C. Todd Lopez The Army plans to launch an aerostat, part of the “Joint Land Attack Cruise Missile Defense Elevated Netted Sensor,” in late December 2014. The JLENS aerostat will be tethered to the...
 

 
Air Force photograph by SrA. Jordan Castelan

AF delivers Iraqi F-16s for training in US

Air Force photograph by SrA. Jordan Castelan Iraqi air force captain Hama conducts preflight inspections while inside a new to service Iraqi F-16 Fighting Falcon Dec. 17, 2014, located at the nearby Tucson International Airport...
 
 
Air Force photograph by SSgt. Derek VanHorn

Short-notice: A new way to exercise

Air Force photograph by SSgt. Derek VanHorn Airmen from Kadena Air Base, Japan, prepare for an aeromedical evacuation exercise on a KC-135 Stratotanker Dec. 5, 2014, at Misawa Air Base, Japan. The operation was executed in supp...
 
 
Lockheed Martin photograph by Andy Wolfe

Japan, Australia to provide F-35 maintenance sites in Pacific region

Lockheed Martin photograph by Andy Wolfe An F-35C Lightning II joint strike fighter carrier variant prepares to launch from the aircraft carrier USS Nimitz in the Pacific Ocean, Nov. 6, 2014. Japan and Australia will be sharing...
 




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=""> <strike> <strong>