Date: July 6th 2007

07 05 07

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

MEDIA ADVISORY: 35-07

LAUNCH OF DAWN POSTPONED 24 HOURS TO SUNDAY, JULY 8

The launch of NASA's Dawn spacecraft aboard a United Launch Alliance Delta II rocket has been postponed 24 hours

A lightning advisory this morning precluded the start of the Delta II second stage fueling as scheduled If weather remains unacceptable this afternoon, fueling will be performed on Friday Also this morning, the temperature within the fairing caused the required temperature of the second stage to be too warm for fueling to begin The fairing temperature is being lowered by 10 degrees so that oxidizer loading can begin this afternoon if weather is acceptable

The countdown dress rehearsal scheduled for today has also been postponed until Friday

The launch window on Sunday, July 8, extends from 4:04 to 4:33 p m EDT The chance of not meeting the launch weather criteria on Sunday is 60 percent Required launch telemetry assets downrange will be in place to support the launch

The Dawn mission science briefing scheduled for Friday, July 6, will be held as scheduled starting at 1 p m EDT The prelaunch press conference will be held on Saturday at 1 p m following the launch readiness review

-end-

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