Tag Archives: DSA

The pieces of the puzzle are coming together

The activities on the spacecraft are almost finished. The great achievement of last week was the smooth deployment of the sunshield. The Astrium and Sener teams are now giving the final touch to configure the satellite for flight. This week we will check for the last time the leak tightness of the propellant tanks and then Gaia will be ready to move to another building (called S5A) where it will be fuelled. With Gaia almost ready it was time to have a look to other pieces of the puzzle. We therefore paid a visit to the MIK building (MIK is the Russian acronym for the huge hall where the three stages of...

video

Gaia sunshield deployment time lapse sequence

Here are some nice time-lapse sequences from the deployment test of the Gaia Deployable Sunshield Assembly (DSA) on 10 October 2013, in the cleanroom at Europe's spaceport in Kourou.     Since the DSA will operate in microgravity, it is not designed to support its own weight in the one-g environment at Earth's surface. Therefore, during deployment testing on the ground, the DSA panels are attached to a system of support cables and counterweights that bears their weight, preventing damage and providing a realistic test environment. Once in space, the sunshield has two purposes: to shade Gaia's sensitive telescopes and cameras, and to provide power to operate the spacecraft. Gaia will always...

Pyrotechnic and 24 bangs: The sunshield deployment

Several cameras have been strategically positioned around the spacecraft and programmed to take a picture every 3 seconds. Inside the cleanroom, utter silence pervades, which is interrupted only by the regular clicking of the cameras. Three windows provide a view of the cleanroom from the rooms outside. Behind those windows, the rooms teem with people. All eyes are glued to the spacecraft. The anticipation in the air is sliced by the sudden ringing of a red telephone on the wall. We’ve been expecting the call: the software team is ready to command the deployment sequence. There is only time for one last quick check: are we good to go? The team leader...

Installing the Gaia Sunshield

Six in the morning in Kourou: outside it is still dark, but the thermometers are already reading 24 degrees Celsius, and the relative humidity has remained 92% through the night. After sunrise at 06:18 today, the temperature will climb to reach a maximum of 34 degrees in the afternoon. The Gaia spacecraft, however, is inside the cleanroom, where the temperature is maintained at a constant 23 degrees. Air is circulated through filters to preserve a clean environment, and the humidity in the cleanroom will be kept at about 50%. In the airlock leading to the cleanroom, the Astrium Assembly, Integration and Testing (AIT) team and the SENER Sunshield team are getting ready...