ESA PR 09-2005. The latest version of Ariane 5, designed to loft payloads of up to 10 tonnes to geostationary transfer orbit, successfully completed its initial qualification flight on 12 February. After a perfect liftoff from Europe’s Spaceport in French Guiana, at 18:03 local time (22:03 CET), the launcher on Ariane Flight 164 injected its payload into the predicted transfer orbit.
This success paves the way for the commercial introduction of this 'Ariane 5 ECA' version, which is due to replace the current Ariane 5G 'Generic' configuration and is designed to maintain the competitiveness of European launch systems on the world launch services market. Starting from the second flight scheduled for mid-year, Ariane 5 ECA will become the new European workhorse for lifting heavy payloads to geostationary orbit and beyond.
Ariane 5 ECA features upgraded twin solid boosters, each loaded with an extra 2.43 tonnes of propellant, increasing their combined thrust on liftoff by a total of 60 tonnes compared to the Generic configuration. The cryogenic main stage has also been upgraded to carry 15 tonnes of additional propellant. It is powered by the new Vulcain 2 engine, derived from Vulcain 1, which provides 20% more thrust. The Ariane 5 ECA introduces the new high-performance "ESC-A" cryogenic upper stage, powered by the same HM-7B engine as on the Ariane 4 third stage.
Ariane 5 ECA has enough lift capacity to take most combinations of commercial satellites to geostationary transfer orbit and will enable Arianespace to reinstate the systematic dual-launch policy that spelled the success of previous generations of Ariane launchers.
Commercial and technology payloads
On this flight, the Ariane 5 ECA launcher carried three payloads. The first released 26 minutes into flight, was XTAR-EUR, a 3600-kg commercial X-band communication satellite flown on behalf of XTAR LLC. This will subsequently use its onboard propulsion system to achieve circular orbit. After an initial period of in-orbit testing, it will be deployed to provide secure communications to government customers.
The other two satellites onboard, the Sloshsat FLEVO minisatellite and the Maqsat B2 instrumented model, stored inside the Sylda dual launch adapter, were flown on behalf of ESA.
Next released, 31 minutes after liftoff, the Sloshsat Facility for Liquid Experimentation and Verification in Orbit is a 129-kg satellite developed for ESA by the Dutch National Aerospace Laboratory (NRL). It will investigate fluid physics in microgravity to understand how propellant-tank sloshing affects spacecraft control. Its mission is planned to last 10 days.
In order to limit the proliferation of space debris, the third passenger, Maqsat B2, will remain attached to the launcher's upper stage. This 3500-kg instrumented model was designed to simulate the dynamic behaviour of a commercial satellite inside the Ariane 5 payload fairing. An autonomous telemetry system transmitted data on the payload environment during all the flight phases, from liftoff to in-orbit injection. Fitted with a set of cameras, Maqsat B2 also provided dramatic onboard views of several key flight phases, including separation of the solid boosters and jettisoning of the Sylda upper-half payload.
“Less than one month after the descent of Huygens on Titan, this launch marks another great achievement for Europe in space and a further demonstration of European skills in this highly demanding technological field” said Jean-Jacques Dordain, Director General of ESA, after the flight. “Today’s success is also just reward for all the people, in industry and at agencies all over Europe, who have been working so hard to bring this launcher back into operational use.
"Guaranteed access to space is a pre-requisite for our success in all space activities and so it is our duty to maintain this capacity to the full.”
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