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DUKAS_132580512_EYE
Webb fuelled for launch
The James Webb Space Telescope was fuelled inside the payload preparation facility at Europe’s Spaceport in French Guiana ahead of its launch on Ariane 5.
Webb’s thrusters will use this propellant to make critical course-corrections after separation from Ariane 5, to maintain its prescribed orbit about one and a half million kilometres from Earth, and to repoint the observatory and manage its momentum during operations.
Fuelling any satellite is a particularly delicate operation requiring setup of the equipment and connections, fuelling, and then pressurisation.
Webb’s propellant tanks were filled separately with 133 kg of dinitrogen tetroxide oxidiser and 168 kg hydrazine. Oxidiser improves the burn efficiency of the hydrazine fuel.
These propellants are extremely toxic so only a few specialists wearing Self-Contained Atmospheric Protective Ensemble, or ‘scape’ suits, remained in the dedicated fuelling hall for fuelling which took 10 days and ended on 3 December.
The next steps will start soon for ‘combined operations’. This is when specialists working separately to prepare Webb and Ariane 5 will come together as one team. They will place Webb atop its Ariane 5 launch vehicle and encapsulate it inside Ariane 5’s fairing.
Then, no longer visible, Webb, joined with its Ariane 5 launch vehicle will be transferred to the Final Assembly building for the final preparations before launch.
Webb will be the largest, most powerful telescope ever launched into space. As part of an international collaboration agreement, ESA is providing the telescope’s launch service using the Ariane 5 launch vehicle. Working with partners, ESA was responsible for the development and qualification of Ariane 5 adaptations for the Webb mission and for the procurement of the launch service by Arianespace.
Credit: P PIRON/ESA/CNES/ARIANESPACE / eyevine
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P PIRON/ESA/CNES/ARIANESPACE / eyevine -
DUKAS_127196973_EYE
Quantum satellite
A sophisticated telecommunications satellite capable of being completely repurposed in orbit has been fuelled ready for its launch on 30 July.
Developed under an ESA Partnership Project called Quantum, the satellite is pioneering a new generation of fully reconfigurable satellites that can respond while in orbit to changing demands on Earth during their 15-year lifetimes.
It is the first reprogrammable commercial telecommunications satellite to operate in a high-frequency radio range called the Ku band that is used for data transmission and secure communications, notably with ships at sea.
Its beams can be redirected to move in almost real time to provide information to passengers on board moving planes or ships. The beams can also be adjusted at the push of a button, so that more data is delivered when demand surges.
The successful development and manufacture of the satellite resulted from the contribution of all industrial partners under an ESA Partnership Project with satellite operator Eutelsat. It is a UK flagship project with most of the satellite developed and manufactured by UK industry. Airbus is the prime and was responsible for manufacturing the satellite’s payload and Surry Satellite Technology Ltd manufactured the new platform.Credit: ESA / eyevine
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(FOTO: DUKAS/EYEVINE)
ESA / eyevine -
DUK10101636_011
NEWS - Wertverlust des Pesos: Argentinien fürchtet erneuten Absturz
Bourgoin jallieu le 03/09/2018 : Illustration prelevement a la source et la lettre aux contribuables de Gerald DARMANIN//ALLILIMOURAD_ALLILI012946/Credit:ALLILI MOURAD/SIPA/1809031757 (FOTO: DUKAS/SIPA) *** Local Caption *** 00873560
(c) Dukas -
DUK10101636_016
NEWS - Wertverlust des Pesos: Argentinien fürchtet erneuten Absturz
Bourgoin jallieu le 03/09/2018 : Illustration prelevement a la source et la lettre aux contribuables de Gerald DARMANIN//ALLILIMOURAD_ALLILI012947/Credit:ALLILI MOURAD/SIPA/1809031757 (FOTO: DUKAS/SIPA) *** Local Caption *** 00873560
(c) Dukas -
DUK10101636_012
NEWS - Wertverlust des Pesos: Argentinien fürchtet erneuten Absturz
Bourgoin jallieu le 03/09/2018 : Illustration prelevement a la source et la lettre aux contribuables de Gerald DARMANIN//ALLILIMOURAD_ALLILI012949/Credit:ALLILI MOURAD/SIPA/1809031757 (FOTO: DUKAS/SIPA) *** Local Caption *** 00873560
(c) Dukas