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NASA successfully deployed complex sun visor on James Weber Space Telescope

via:cnBeta     time:2022/1/5 9:01:41     readed:66

According to the Verge, NASA's James & Middot; Weber Space Telescope has successfully launched its sun visor - this is a key feature of the telescope to maintain its instrument low temperature during execution tasks.The expansion of the visor marks the end of the most complex deployment, the telescope must complete this deployment to operate normally in space.


"This is a very important moment," The JWST project manager of the Nasa Gordide Space Flight Center said to the task team after deployment. "I just want to congratulate the whole team. We still have a lot of work to do, but take out and deploy the sun visor is really very, very important thing."

James & Middot; Weber Space Telescope (or JWST) is a strong NASA's strong new space observatory. After approximately 25 years, it was launched on December 25.JWST is often considered to be the successor of the Hubble Space Telescope currently on the Earth track, which is expected to provide more energy and stronger capabilities to observe the distant and weak celestials in our universe. Astronomers want to use JWST "peep" to see the first stars and galaxies formed by only hundreds of millions of years after large explosion.

But in order to observe the ancient universe, JWST must first experience a complex development process. The telescope is too large and cannot be launched in space with its final configuration, so the task designer carefully designs telescope to expand after the launch. Expanding hundreds of mechanisms and movable components, everything must be normal, JWST can play a role.In this process, up to 344 single-point faults, these deployments do not have any backups, must be executed according to design, otherwise it will endanger the entire task.

A part of the expansion process needs to deploy the jwst's sun visor. JWST observed is infrared light, which is a non-visible light related to heat. Because of this, the telescope must maintain a very low temperature to work properly, and work about 370 degrees under the Washper minus. The sun visor is composed of five thin reflective materials Kapton to prevent the heat of the sun from bake the telescope too hot.

The deployment of the sun is an extremely complex event; these layers are incredible films and must remain intact. Up to 107 release mechanisms are used to expand these layers, each mechanism must work according to the plan to make the sun visible. Once these layers are expanded, the spacecraft must tighten them, a bit like sails on the sailing.


The deployment of the sun spent a week, more than the original plan. NASA previously tentatively takes 6 days, but the JWST team paused in the weekend of the New Year to get some rest and carefully study the data received from the spacecraft. Due to some unexpected temperature reading and equipment issues, they have to solve some problems on the way. "We are still in the stage of the telescope," OCHS said at the press conference before the deployment ends. "The track satellite is always different on the track and on the ground."

The first question they face is a small problem with the solar battery array of JWST, which is required from the energy obtained from the sun.A factory preset of the solar cell array limits their power output, but Nosrop & Middot; Grumman recombines the battery array based on their temperatures experienced in space. This seems to solve this problem, JWST has now obtained enough energy to work. Another problem is to surround the motor used to release the sun visor and help the stretched layer. Their operating temperature is higher than the JWST team expects, so the task engineer has adjusted the direction of the telescope to reduce the sun to them. This helps cool down the motor before planning.

Now, the sun visor has been launched, and some of the most difficult moments in the JWST deployment process have become. NASA said that 70% to 75% of single-point faults have been formally completed. Ochs said at the press conference: "For about ten days before the spacecraft is running, the task is arduous."

However, for the telescope, there are other milestones to do. It is worth noting that the Observatory still needs to deploy some of its main mirror, which is the main tool for collecting rays from remote galaxies and stars. This key event will happen to approximately one week, just like all deployments so far, it must be perfectly perfect to make JWST to complete its work.

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