NASA announced it on January 5 local time.The work of the operations team to deploy the sun visor (shade) of the new “James Webb” space telescope is complete.I have been clear. Sunshield observes celestial bodies at infrared wavelengthsA very important device for cooling the Webb Space TelescopeAs a result, the telescope reached one of the milestones towards the start of observation six months after launch.
■ 10 days have passed since the launch and the huge sun shade has been successfully deployed.
At 9:20 p.m. on December 25, 2021 (Japanese time, same applies below unless otherwise noted) in Europe“Ariane 5”The rocket-launched James Webb Space Telescope was born in early space.The first generation stars in the universe(First star, first star)First generation galaxy??Observation of extrasolar planetsResearchers around the world should play an active role in these areas.
The Webb Space Telescope is one of the Lagrange points where the gravity of the earth and the sun and the centrifugal force applied to celestial bodies are balanced.L2 」It will take about a month to surrender (the distance from land is about 1.5 million km), and observation will begin after the equipment has been cooled and calibrated (about 6 months after launch).
As mentioned above, the Webb Space TelescopeInfraredInfrared rays are emitted not only by celestial bodies but also by heated objects. The space telescope itself is no exception, and the temperature of the primary mirror, secondary mirror, observation device, and cell should be kept as low as possible.Infrared rays emitted by themselves interfere with observationIt will be.
Therefore, the Webb Space Telescope is used to block sunlight that heats up the mirror and the plane.Sun visorIs installed. The lens hood is made of five ultra-thin films of Kapton (a type of polymer) with aluminum vapor deposited on the surface, and even though the temperature on the sun side reaches 110 degrees Celsius, the temperature of the opposite side where the scientific equipment is located. the teethMinus 230-240 degrees CelsiusIt is said to be kept at a low temperature.
However, every part of the Webb Space Telescope, like the sun visor, which is roughly the size of a tennis court (around 21m x 14m), and the main mirror (diameter 6.5m), was too large to fit in the Ariane 5.fairing.A structure that expands into space after being launched in a folded state
Has been adopted.
*… The Ariane 5 fairing, where artificial satellites and spacecraft are mounted at the end of the rocket, measures 5 m in diameter.
Related: James Webb Space Telescope Passes Huge ‘Canopy’ Deployment Test
[▲ Video showing from the launch of the James Webb Space Telescope to the completion of the deployment of the primary mirror (Credit: ESA / ATG medialab)]Work on deploying the sunshade began three days after launch. First, at 3:21 a.m. on December 29, 2021UPS in front of the plane(Unified Pallet Structure) at 9:27 am the same dayRear inverterCompleted deployment to their respective positions. The inverter contains five folded films, as well as the components that make up the sun visor, such as cables, pulleys and trigger mechanisms. Before dawn on December 31st after deploymentThe UPS blanket that covered the film
Was rolled up.Then, on January 1, 2022, it will be used to take out the sun visor on the side.Arms on both sides of the planeDeployment work has been carried out (mid-boom). The left arm is extended from 3:30 a.m. to 6:49 a.m. and the right arm is extended from 8:31 a.m. to 12:13 p.m. Final phaseStretching work to apply tension to the filmIs started in order from the first film finished at 5:48 on January 4, and the fifth final film isEnded at 1:59 am on January 5, 10 days after launch
[▲ Engineers (Credit: Northrop Grumman) who check DTA when an operation test is performed on the ground]In parallel with the work of deploying the sun visor body, connect the upper part of the aircraft equipped with the telescope and observation equipment to the body (bus) of the Webb space telescope as a spacecraft.DTAWork has also been done to extend the tower structure called (Deployable Tower Assembly). The DTA keeps heat-sensitive mirrors and viewing devices away from the bus and provides space for the five films that make up the lens hood.Structure that extends over 1.2 m
He became. The DTA was deployed from 11:45 p.m. on December 29, 2021 to 6:24 a.m. on the following 30, spending over six and a half hours.
Related: Next Generation ‘James Webb’ Next Generation Space Telescope Ground Testing Progress ExpectedIn addition, it will be located at the rear end of the sun visor around 11:00 p.m. on December 30, 2021.Momentum paneHas been deployed. According to NASA, the Webb Space Telescope’s vast sunshadeThe plane will rotate under the pressure of sunlight.Therefore, as it is, the rotation must be canceled using a reaction wheel (a device for stabilizing the attitude of the spacecraft by rotating or adjusting the speed of rotation to change the attitude). The impulse shutter is a sun visor which receives slight pressure.Adjust the balance
It is said to help stabilize the aircraft and reduce propellant consumption.According to NASA, 139 trigger mechanisms (out of a total of 178 locations on the plane), 70 hinge assemblies, 8 motors, and approximately 400 pulleys are used to deploy and extend the Webb Space Telescope’s sunshade. , 90 cables (total length about 400 m) were involved. The work program was to reconfirm that the blanket covering the film had been successfully rolled up before deploying the arm, and to spend a day optimizing the feed system and motor for film stretching. Although changed from time to time, the characteristic diamond-shaped or kite-shaped sunshadeDeployment completed as planned
[▲SunshielddeploymenttestconductedonthegroundinOctober2019(Credit:NorthropGrumman)]An important step to complete the deployment of the sun visorThe James Webb Space Telescope has just arrived, but deployment work continues. After that he was supported by a long beamSecondary mirrorhe was foldedLeft and right parts of the primary mirror, For observation equipmentradiator
Deployment work is planned.In addition, about a month after launch, the Webb Space Telescope will be put into operational orbit around L2 for observation.Last injection of orbit correction
Must also be done. In sorae, we will keep you posted on the journey of the Webb Space Telescope to L2.
Related: Next Generation ‘James Webb’ Space Telescope Could Be Operational For Over 10 Years
Image Credit: NASA GSFC / CIL / Adriana Manrique Gutierrez
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