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Archive for July, 2007

07-Jul-07 | Another delay — until September

Dawn is now scheduled to launch no sooner than September. Troubles with downrange tracking assets have been cited as the cause for delaying from 8 July, and NASA management has decided not to force a launch attempt prior to the current window’s closure on 19 July. Another factor was a desire not to impact the launch of Phoenix, NASA’s next Mars lander, whose 21-day launch window opens on 3 August (and after which another opportunity will not occur until 2009). The exact date of Dawn’s next launch window opening is unclear, but it will extend through late October. (Spaceflight Now, 07-Jul-07)

05-Jul-07 | Dawn delayed by 24 hours

The launch of Dawn has been postponed until Sunday, 8 July, because a lightning advisory in the Cape Canaveral area, along with an overly-high temperature reading within the fairing of the Delta II-Heavy launch vehicle, precluded the start of second stage fuelling today. Propellant loading has been pushed back to this afternoon at the earliest, and the countdown dress rehearsal will take place on Friday. With a launch window on Sunday of 4:04 to 4:33 p.m. EDT, Florida’s tendency for mid-afternoon thunderstorms comes into play, and the forecast for Sunday predicts only a 40% chance of meeting the criteria for launch. (NASA Media Advisory, 05-Jul-07)



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