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9 Mar 2004
(Source: Johns Hopkins University Applied Physics Laboratory)

The Johns Hopkins University Applied Physics Laboratory
Office of Communications and Public Affairs
Laurel, Maryland

Media Contact: Michael Buckley
(240) 228-7536 or (443) 778-7536
March 9, 2004

FOR IMMEDIATE RELEASE [Note to Editors: Images to accompany this release are available on the Web at:]

NASA's First Mercury Orbiter Mission Preparing for May 11 Launch

NASA's MESSENGER spacecraft left home in Maryland today for Cape Canaveral, Fla., site of its scheduled May 11 launch toward Mercury and the first study of that planet from orbit.

Secured in an air-conditioned moving van, MESSENGER set out from NASA's Goddard Space Flight Center in Greenbelt and will reach Kennedy Space Center/Cape Canaveral Air Force Station tomorrow, March 10. MESSENGER - short for MErcury Surface, Space ENvironment, GEochemistry, and Ranging - spent the past three months being baked, frozen, spun, shaken and probed in Goddard's test facilities, experiencing the conditions of launch and its upcoming five-year journey to the innermost planet.

Over the next several weeks, engineers from the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Md., where MESSENGER was designed and built, will prepare the spacecraft for launch at the Astrotech Space Operations facility near Kennedy Space Center. Other team members will continue to test the spacecraft's key operating systems remotely from the MESSENGER Mission Operations Center at APL.

Set for a predawn launch aboard a Boeing Delta II rocket, MESSENGER will fly past Venus three times and Mercury twice before starting its yearlong orbital study of Mercury in July 2009. The Venus flybys, in November 2004, August 2005 and October 2006, use the planet's gravity to guide MESSENGER toward Mercury's orbit. Mercury flybys in October 2007 and July 2008 further tune MESSENGER's path and allow the spacecraft to gather data critical to planning the mission's orbital phase.

The compact 1.2-ton spacecraft features several defenses against the intense heat and bright sunlight at Mercury, including a ceramic-fabric sunshade and a heat-radiation system. The mission's orbit design will also keep MESSENGER cooler by allowing it to pass only briefly through heat reflecting off the hottest spots on Mercury's surface, where temperatures can exceed 840 degrees Fahrenheit (450 degrees Celsius).

MESSENGER is the next launch in NASA's Discovery Program of lower cost, highly focused space science investigations. Sean C. Solomon of the Carnegie Institution of Washington leads MESSENGER as principal investigator; APL manages the mission for NASA's Office of Space Science. For more information on the mission, visit

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Last Updated: 10 Mar 2004