The European Space Agency has set the maiden flight of its new light launcher, Vega, for 13 February - four days later than had been announced two weeks ago and perilously close to the point when the flight will have to be scrubbed to make way for a 9 March Ariane 5 launch to deliver ESA's third Automated Transfer Vehicle robotic supply ship to the International Space Station.
ESA's launch facility in Kourou, French Guiana could handle both flights more or less simultaneously, but the two rockets will follow similar trajectories and thus share the same set of ground stations, including some tracking equipment aboard ships that are today in place for the Vega launch but must be repositioned before the ATV flight. Traffic to the ISS is heavy, so 9 March - give or take a day for normal launch delays - is a non-negotiable slot.
If Vega cannot fly before Ariane 5, it will get a new date in late March or April.
Historical data shows that fully 60% of maiden launches end in failure, but ESA is determined to take every precaution for a success. At this time last year, ESA had hoped to make the Vega flight before the close of 2011, but eventually settled on 26 January 2012 - the key being to find a date in between the first-ever Soyuz flight from Kourou (which flew as planned on 20 October) and the ATV launch on 9 March.
Vega has been nine years in the works and will give ESA exceptional flexibility in its operations. The rocket's sweet spot is to place a 1.5T payload into a 750km orbit, ideal for Earth observation or scientific missions. Soyuz can loft 3T to the very high geosynchronous orbits - its first Kourou payload was a pair of Galileo navigation satellites. Ariane 5 is much bigger, ideal for up to 10T to geosynchronous orbits or heavy loads to the Space Station.
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