Jet Propulsion Laboratory, Pasadena, Calif.
University of Maryland, College Park, Md.
July 4, 2005
NASA's Deep Impact Generates Its Own Spectacular Photo Flash
The hyper-speed demise of NASA's Deep Impact probe generated an immense flash of light, which provided an excellent light source for the two cameras on the Deep Impact mothership. Deep Impact scientists theorize the 820 pound impactor vaporized deep below the comet's surface when the two collided at 1:52 am July 4, at a speed of 6.3 miles per second.
"You can not help but get a big flash when objects meet at 23,000 miles per hour," said Deep Impact co-investigator Dr. Pete Schultz of Brown University, Providence, R.I. "The heat produced by impact was at least several thousand degrees Kelvin and at that extreme temperature just about any material begins to glow. Essentially, we generated our own incandescent photo flash for less than a second."
The flash created by the impact was just one of the visual surprises that confronted the Deep Impact team. Preliminary assessment of the images and data downlinked from the flyby spacecraft have provided an amazing glimpse into the life of a comet.
"They say a picture can speak a thousand words," said Deep Impact project manager Rick Grammier of NASA's Jet Propulsion Laboratory, Pasadena, Calif. "But when you take a look at some of the ones we captured in the early morning hours of July 4, 2005 I think you can write a whole encyclopedia."
At a press conference held the morning of July 4, Deep Impact team members displayed a movie depicting the final moments of the impactor's life. The final image from the impactor was transmitted from the short-lived probe all of three seconds before it met its fiery end.
"The final image was taken from a distance of 18.6 miles from the comet's surface," said Deep Impact principal investigator Dr. Michael A'Hearn of the University of Maryland, College Park. "From that close distance we can resolve features on the surface that are less than 4 meters across. When I signed on for this mission I wanted to get a close up look at a comet but this is ridiculous… in a great way."
The Deep Impact scientists are not the only ones taking a close look at their collected data. The mission's flight controller team is analyzing the impactor's final hours of flight. When the real-time telemetry came in after the impactor's first rocket firing it showed the impactor moving away from the comet's path.
"It is fair to say we were monitoring the flight path of the impactor pretty closely," said Deep Impact navigator Shyam Bhaskaran of JPL. "Due to the flight software program this initial maneuver moved us seven kilometers off course. This was not unexpected but at the same time not something we hoped to see. But then the second and third maneuvers put us right where we wanted to be."
The Deep Impact mission was implemented to provide a glimpse beneath the surface of a comet, where material from the solar system's formation remains relatively unchanged. Mission scientists hoped the project would answer basic questions about the formation of the solar system, by providing an in-depth picture of the nature and composition of the frozen celestial travelers known as comets. The University of Maryland is responsible for overall Deep Impact mission science, and project management is handled by JPL. The spacecraft was built for NASA by Ball Aerospace & Technologies Corporation, Boulder, Colo.
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