Four O3b Network satellites integrated to Arianespace Soyuz launcher

The fifth Soyuz to be launched from French Guiana is now complete following the integration of its upper composite consisting of four O3b Networks satellites, their protective payload fairing and the Fregat upper stage.

This activity was performed at the Spaceport's ELS launch complex near the town of Sinnamary, beginning with the composite's transfer on a special transporter, followed by hoisting to the upper level of a purpose-built mobile gantry.

Final checkout of the Soyuz is now underway, leading to the Arianespace liftoff planned on Monday, June 24 at precisely 3:53:51 p.m., local time in French Guiana.

The cluster of four O3b Networks satellites to be orbited on Arianespace's upcoming flight will initiate the creation of a next-generation satellite network for telecommunications operators, Internet service providers, enterprise and government customers in emerging markets.

A total of 12 O3b Networks satellites are to be orbited by Arianespace in groups of four, with the next mission planned for later this year, and another in 2014.

These Ka-band relay platforms are produced by Thales Alenia Space, and have a liftoff mass of 700 kg. each.

ESA ATV Albert Einstein: Fully fuelled at Europe's Spaceport in Kourou, French Guiana

ATV Albert Einstein is fuelled at Europe's Spaceport in Kourou, French Guiana. 

Automated Transfer Vehicles (ATVs) carry two types of propellant to the International Space Station. 

Aside from its own propellants, the space ferry brings propellants for the Russian Station thrusters. 

They are loaded in four phases - and each component is highly toxic. 

All non-essential personnel are cleared from the room and operators wear sealed 'scape suits' at all times during fuelling. 

Image courtesy ESA/CNES/Arianespace/Optique Video du CSG.

Automated Transfer Vehicles (ATVs) can deliver up to 7 tonnes of cargo to the International Space Station, including supplies and equipment, water, air, nitrogen, oxygen and fuel.

As the Space Station circles Earth, it slowly loses altitude so ATVs reboost the orbit to keep it aloft.

Part of ATV's cargo includes propellants for the Station's own thrusters to keep the orbital outpost at the right height even when no spacecraft are there to offer a helping hand.

Loading the fuel is a complex and hazardous process that takes place over many days during continuous sessions of up to 30 hours.

Should there be a leak, the operators are protected by 'scape suits' that deliver fresh air and are sealed off from the working environment, much like diving suits.

The operators must remain vigilant at all times, constantly checking progress and signs of leaks. To make matters more complicated, ATV own propellants are different to those used by the International Space Station itself, requiring different equipment each time.

Both fuels need separate oxidisers for combustion outside of Earth's atmosphere. The oxidisers are also loaded separately, meaning that four different liquids are being pumped into Albert Einstein's tanks in total.

ESA Ariane-5 Launch preparations: Mission ATV - Albert Einstein

Ariane 5’s cryogenic core stage is suspended over the launch table in the Spaceport’s Launcher Integration Building. Credits: ESA/CNES/Arianespace/Optique Video du CSG

The launcher for Arianespace’s fourth flight with Automated Transfer Vehicle 4 (ATV-4), Albert Einstein, is rapidly taking shape at the Spaceport, preparing it for liftoff in the spring from French Guiana with the International Space Station’s latest resupply spacecraft.

During activity this month in the Spaceport’s Launcher Integration Building, the heavy-lift vehicle’s core cryogenic stage was suspended over the mobile launch table, followed by positioning of its two solid propellant boosters.

The launcher’s EPS storable propellant upper stage will then be installed, readying the Ariane 5 for transfer to the Final Assembly Building, where the latest ATV (named after Albert Einstein) is to be mated.