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NASA Launches Interstellar Boundary Explorer

By | October 20, 2008

      Spacecraft Will Remain In Orbit For 45-Day Systems Checkout, Then Head Off To Edge Of Solar System

      The Interstellar Boundary Explorer mission, or IBEX, successfully launched from the Kwajalein Atoll in the Pacific Ocean at 1:47 p.m. ET yesterday.

      The spacecraft rode into the solar system void on a Pegasus rocket that was carried aloft on an L-1011 aircraft, which served as the launch platform for the rocket.

      IBEX will be the first spacecraft to image and map dynamic interactions taking place in the outer solar system, NASA announced.

      The spacecraft separated from the third stage of its Pegasus launch vehicle and immediately began powering up components to control onboard systems. The operations team is continuing to check out spacecraft subsystems.

      "After a 45-day orbit raising and spacecraft checkout period, the spacecraft will start its exciting science mission," said IBEX mission manager Greg Frazier of Goddard Space Flight Center in Greenbelt, Md.

      Just as an impressionist artist makes an image from countless tiny strokes of paint, IBEX will build an image of the outer boundary of the solar system from impacts on the spacecraft by high-speed particles called energetic neutral atoms.

      These particles are created in the boundary region when the 1 million mph solar wind blowing out in all directions from the sun plows into the gas of interstellar space.

      This region is important to study because it shields many of the dangerous cosmic rays that would flood the space around Earth.

      "No one has seen an image of the interaction at the edge of our solar system where the solar wind collides with interstellar space," said IBEX Principal Investigator David McComas of the Southwest Research Institute in San Antonio.

      "We know we’re going to be surprised. It’s a little like getting the first weather satellite images. Prior to that, you had to infer the global weather patterns from a limited number of local weather stations. But with the weather satellite images, you could see the hurricanes forming and the fronts developing and moving across the country."

      IBEX is the latest in a series of low-cost, rapidly developed Small Explorers spacecraft. The Southwest Research Institute developed the IBEX mission with a team of national and international partners. Goddard manages the Explorers Program for the Science Mission Directorate in Washington.

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