[meteorite-list] ESA Helping China To The Moon

[Ron Baalke]

http://www.esa.int/Our_Activities/Operations/Helping_China_to_the_Moon

Helping China To The Moon
European Space Agency
29 November 2013

Shortly after China's Chang'e-3 spacecraft departs Earth to land on the 
Moon, ESA's network of tracking stations will swing into action, providing 
crucial support for the vessel's five-day lunar cruise.

China's Chang'e-3, named after the mythological goddess of the Moon, is 
scheduled for lift off on 1 December from the Xichang launch base in China's 
Sichuan province on a journey to deposit a lander and a six-wheeled rover 
on the lunar surface.

The landing, in the Sea of Rainbows on 14 December, will be the first 
since Russia's Luna-24 in 1976.

Immediately after liftoff, ESA's station in Kourou, French Guiana, will 
start receiving signals from the mission and uploading commands on behalf 
of the Chinese control centre.

The tracking will run daily throughout the voyage to the Moon. Then, during 
descent and after landing, ESA's deep-space stations will pinpoint the 
craft’s path and touchdown. 

"We are proud that the expertise of our ground station and flight dynamics 
teams and the sophisticated technologies of our worldwide Estrack network 
can assist China to deliver a scientifically important lander and rover 
to the Moon," says ESA's Thomas Reiter, Director for Human Spaceflight 
and Operations.

"Whether for human or robotic missions, international cooperation like 
this is necessary for the future exploration of planets, moons and asteroids, 
benefitting everyone."

The effort is being run from the Estrack Control Centre in ESA's European 
Space Operations Centre in Darmstadt, Germany.

Following lunar mission progress

Chang'e-3 liftoff is set for around 18:00 GMT on 1 December, and the 15 
m-diameter dish in Kourou will pick up the first signals around 18:44 
GMT.

Working with Chinese tracking stations, Kourou will support the mission 
through lunar orbit entry on 6 December continuing until just prior to 
its descent to the surface, expected around mid-day on 14 December.

The landing and rover operations on the Moon will be commanded via two 
Chinese tracking stations at Kashi, in the far west of China, and at Jiamusi, 
in the northeast.

"After the lander and rover are on the surface, we will use our 35 m-diameter 
deep-space antennas at Cebreros, Spain, and New Norcia, Australia, to 
provide 'delta-DOR' location measurement," says Erik Soerensen, responsible 
for external mission tracking support at ESOC.

"Using this delta-DOR technique, you can compute locations with extreme 
accuracy, which will help our Chinese colleagues to determine the precise 
location of the lander."

Ceberos and New Norcia stations watch lunar landing

Together with Cebreros, New Norcia will record Chang'e-3's radio signals 
during landing, which will help the Chinese space agency to reconstruct 
the trajectory for future reference.

A team of engineers from China will be on hand in Darmstadt. "While we're 
very international at ESOC, hardly anyone speaks Mandarin, so having Chinese 
colleagues on site will really help in case of any unforeseen problems," 
says Erik.

"Both sides are using international technical standards to enable our 
stations and ESOC to communicate with their mission and ground systems."