Europe’s latest Galileo satellites are entirely fuelled, withdrawal them prepared to be trustworthy to their launcher top theatre in credentials for their 11 Sep launch.
Galileo 9 and 10 are due to launch atop a Soyuz launcher during 02:08 GMT on 11 Sep (04:08 CEST; 23:08 internal time, 10 September) from Europe’s Spaceport in French Guiana.
Technicians donned spacesuit-like SCAPE (Self Contained Atmospheric Protective Ensemble) suits to fill any satellite with sufficient hydrazine fuel for their designed 12 years of operations in space.
This fuel is indispensable for fine-tuning of their orbital paths following their launch, followed by slight orbital and opinion control over a march of their operative lives.
Each Galileo satellite needs to keep a navigation receiver lerned on Earth’s front during all times, contracting dedicated infrared Earth and Sun sensors for this purpose.
This noted a initial time Galileo had been fuelled within a Guiana Space Centre’s 3SB credentials building. Previously a S5 fuelling building was dedicated to this purpose, though upgrades by Arianespace meant fuelling can now take place during a same plcae where they will subsequently be trustworthy to their Fregat top stage, streamlining a satellite credentials process.
Completion of fuelling means a dual satellites are radically prepared for launch – what needs to be achieved now is to initial insert a Galileos to their launch dispenser, afterwards to repair this in spin to their Fregat.
The satellites and Fregat will afterwards be encapsulated within a launcher fairing, after that this ‘upper composite’ can afterwards be trustworthy to a other 3 stages of a Soyuz ST-B launcher.
The latest Galileo launch debate commenced during a finish of July, with a attainment of a satellites in French Guiana on 24 July.
A ‘fit check’ followed, to endorse a satellites as delivered in Kourou did indeed fit onto a dispenser that will initial secure them in place during launch and afterwards pyrotechnically eject them into their orbits once their aim 23 222 km altitude medium-Earth circuit has been reached.
This was followed by in-depth complement checks and final settings of onboard navigation and information doing program parameters.
Two serve Galileo satellites are still scheduled for launch by finish of this year. One of these satellites is completing contrast during ESA’s ESTEC technical centre in Noordwijk, a Netherlands, while a other one has already finished a contrast and is available travel to Kourou in a second half of October.
In further a initial satellite of a following collection has arrived during ESTEC and is now undergoing a thermal opening test. Another moody indication will arrive during ESTEC by mid-September.