﻿﻿﻿ 30 days 1.5 million kilometers, Web telescope arrived at the end of the transfer, 18 mirror

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2022-01-28 18:05:28 40 ℃

After 30 days of journey, after sailing 1.46 million kilometers, the world's first "pigeon", a $ 10 billion Web telescope finally arrived at the destination: the second Lagrangian point L2 in the day.

This tumbling space telescope has experienced a variety of hard dangers, and finally arrived at the destination. The stone of the grandius fans finally landed. The most exciting, as the NASA Director, he congratulate Web in the official statement: "Welcome home". Netizens can't wait to see the first photo taken by Webu:

On this way, Webu needs to deploy the sun visor, solar cells, and 18 mirrors, each step must be precise, after all, it does not have any opportunities for repair. Web telescope expands the key sun visor. Of course, the Web telescope "Wanting" is so far, nor is it to run. This ultimate door has a lot of heads. The second Lagrang is really paying attention to the L2 Lagrang's point in the L2 Lagrang destination? In the aerospace sector, L2 is an extremely special location. The spacecraft is justified by the earth and sun gravitationalness in this point, allowing it to move around the sun around the sun. Such Web is always accompanied by the earth, and is always transmitted to the Earth.

Second, Web, which stabilizes at L2 points, always keeps the sun, earth, the moon is on the same side. Because the mission of the Webu telescope is to detect the infrared signal of the remote object, and any object will send an infrared ray, including the sun, earth, moon, and more. In order to block the interference of these heat sources, it is best to let these celestials are located on the same side of Web. Then use the diaphragm protected by the diaphragm of the reflective material Kapton, allowing it to reflect interference from other heat sources as much as possible. In this way, even if the sun surface (left on the left side) reaches 85 degrees Celsius, the telescope (right side below) can also operate normally in the lower 233 degree environment.

In this way, L2 is indeed ideal for Web. However, there is a little and ideal, that is, now the location of Webu is not accurate, but nearby "徊". Depending on physics, L2 points are just an unstable point. Please see the following picture below:

In the figure, the arrow indicates the force direction in the gravitational field. If the Web is tightly disturbed in the direction of the seventh day, it will be far farther away from L2. So Webu needs to carry the fuel at any time. Therefore, the track of Web is actually an elliptical orbit around the L2 point:

Such rail motion needs to consume a certain fuel to maintain, so the life of the Webbian telescope is limited. The first photo is taken this summer after arriving in the destination, the next three months Web will need some initial optical inspections and telescope calibration. First, Web will use the fine navigation sensor, first point the telescope to a bright star to demonstrate the ability to lock the target and use Nircam (near-infrared camera) to obtain data. However, the 18 eyeglasses of the main mirror are not aligned, so the target star's photos are still 18 discrete twisted images, follow-up alignment and calibration will continue until April. In the fifth and sixth months of launch, Web will complete the calibration and commissioning of all instruments, and will take the target small tapping knife in our solar system, comet, satellite, etc., to show its mobile tracking capabilities. These early observations will be released immediately after the debugging. After half a year, the Web will officially began to perform scientific tasks. Just in this summer, we can look forward to the first picture of the strongest space telescope Wweeble.