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Nasa rolls out rocket for ISS cargo launch

18 December 2013, 08:58

Washington - With the space station cooling system hobbled and a commercial cargo launch waiting in the wings, Nasa on Tuesday prepared all options, but said no decision had yet been made on whether space walk repairs would be needed.

Instead, Orbital Sciences rolled its Antares rocket out to the launch pad at Wallops Island, Virginia in preparation for a Thursday launch of its Cygnus supply ship at 21:19 (02:19 GMT).

Meanwhile, Nasa television showed images of astronauts preparing their white spacesuits in case they are called upon to step outside the space station and repair the broken equipment cooling system.

A US space agency spokesperson told AFP a final decision could come later on Tuesday or early on Wednesday.

On Wednesday of last week, Nasa learned that a broken valve had interfered with the cooling loops that regulate the equipment temperature aboard the space station.

The six-man crew was never in danger due to the problem, Nasao said.

If the agency decides the manoeuvres it has made from the ground to orchestrate a temporary fix - by manipulating valves and shutting down some equipment - are stable, the Orbital launch could go ahead.

Orbital Sciences' privately owned cargo ship would then start its journey on its first regular commercial mission to supply the orbiting outpost on Thursday, berthing at the space station on Sunday.

The company did a demonstration launch and berthing at the ISS in September, showing it was capable of the mission and paving the way for more supply trips.

When Nasa lost its capacity to reach space with the retirement of the 30-year shuttle programme in 2011, Orbital and SpaceX stepped in to fill the void with their privately made, unmanned supply spacecraft.

Both companies have lucrative contracts with the US space agency to ferry supplies to the ISS.

SpaceX, the California-based company owned by internet entrepreneur Elon Musk, became the first private company to reach the ISS in 2012 and has a $1.6bn dollar contract for 12 missions with its Dragon space capsule.

Orbital has a $1.9bn contract with Nasa for eight cargo missions to the ISS, toting supplies, food, science experiments and spare parts.

If Nasa decides that engineers on the ground have not been able to fix the ISS cooling system in a way that would be stable for the coming weeks, the Orbital launch would be delayed until next year.

The first of a series of space walks by the astronauts on board would then begin later this week.

The last time astronauts stepped out to replace a faulty ammonia pump was in 2010, and the repair took three space walks to complete.

If space walks are called for this time, they would mark the first time astronauts have ventured outside the orbiting lab since a helmet leak brought an early end to a European astronaut's outing in July.

Italian Luca Parmitano was wearing a US-made spacesuit when a water leak flooded his helmet and risked drowning him.

Two Russians aboard the station are scheduled to step out on a space walk for maintenance work on their own module at the lab on 27 December.

Commander Oleg Kotov and Flight Engineer Sergey Ryazanskiy are slated for an outing to install cameras and other equipment on a platform outside the Russian segment of the station.


Tags nasa us space

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