July 6, 2007

Tabatha Thompson Headquarters, Washington 202-358-3895

George Diller Kennedy Space Center, Fla 321-867-2468

MEDIA ADVISORY: M07-083

DAWN LAUNCH MOVES TO NO EARLIER THAN MONDAY JULY 9

CAPE CANAVERAL, Fla - The launch of NASA's Dawn spacecraft aboard a Delta II rocket has been rescheduled to no earlier than Monday, July 9

Because of difficulties with a downrange telemetry aircraft and the availability of a tracking ship, a launch attempt cannot be made before that time Also, Friday's weather forecast raised the possibility that the loading of propellants aboard the Delta II rocket's second stage might not be completed in time to support a launch before Monday

The launch window for Monday is 3:56 p m to 4:25 p m EDT According to weather forecasts, there is a 40 percent chance of unfavorable conditions for launch

If a launch attempt is targeted for Monday, the prelaunch press conference will be held at 1 p m on Sunday, July 8, at NASA's Kennedy Space Center press site

Media should call 321-867-2525 for launch updates, status changes and instructions on how to monitor or attend Sunday's press conference The press conference and launch will be broadcast live on NASA Television

For more information about Dawn, visit:

http://www nasa gov/dawn

-end-

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