July 5, 2007

Tabatha Thompson Headquarters, Washington 202-358-3895

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

MEDIA ADVISORY: M07-082

NASA POSTPONES DAWN SPACECRAFT LAUNCH

CAPE CANAVERAL, FLA -- Saturday's scheduled launch of NASA's Dawn spacecraft aboard a United Launch Alliance Delta II rocket has been postponed 24 hours

A lightning advisory early Thursday interrupted fueling of the Delta II second stage rocket Also, the temperature of the vehicle's second stage was too warm for the fueling process to begin However, the fairing temperature has been lowered so that another attempt can be made Friday, July 6, pending acceptable weather

Dawn's launch countdown dress rehearsal is now scheduled for Friday The launch window on Sunday, July 8, extends from 4:04 p m to 4:33 p m EDT

Weather for launch still may be an issue with a 60% chance of it not meeting launch criteria on Sunday

The Dawn mission science briefing, scheduled for Friday, will be held as planned at 1 p m The pre-launch news conference is scheduled for 1 p m Saturday, July 7, following the Launch Readiness Review

For more information about Dawn, visit:

http://www nasa gov/dawn

-end-

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