A New Countdown for Soyuz' 1st Flight from the Spaceport
This anomaly was identified as a leak in a launch pad pneumatic system responsible for the programmed disconnection of Soyuz' third stage fueling lines before the vehicle lifts off.
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With the issue resolved, the liftoff is now set for October 21 at 7:30:26 a.m. local time in French Guiana - a precise moment that enables the payload of two Galileo satellites to be injected into their proper orbital plane.
Soyuz' 3-hr. 49-min. flight from the Spaceport will inject the In-Orbit Validation (IOV) spacecraft for Europe's Galileo satellite navigation system into a 23,222-km. circular medium-Earth orbit, inclined 54.7 degrees.
Weighing approximately 700 kg. each, these satellites - along with two others to be lofted by Soyuz in 2012 - will form the operational nucleus of Europe's full 30-satellite Galileo navigation constellation, which is being developed in a collaborative program involving the European Space Agency and European Union.
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Source : Arianespace