Credit：NASA
The Webb Space Telescope arrived in orbit at its new home in space, the L2 point of The Helio-Di Lagrange, in the early morning of January 25, 2022 Beijing time.
What is Webb doing these days?
First, the Webb Space Telescope uses a near-infrared camera (NIRCam) to calibrate the main mirror, a process that will take months, but is now nearing completion in the first phase, called Segment Image Identification.
On Feb. 2, Webb's team targeted the telescope's first observation at HD 84406, primarily to test and calibrate the 18 lenses of the main mirror. The 10 detectors of the Webb NIR camera took a total of 1560 photos, totaling 54G of raw data, and the whole process lasted 25 hours.
HD 84406 is a bright, isolated star in the constellation Ursa Major, about 258.5 light-years away.
Chart of Ursa Major
Image source: IAU
HD 84406 was chosen as Webb's first observed star because it was easier to identify and surrounded by fewer bright stars.
The second thing, Webb took a "selfie" using a dedicated pupil imaging lens inside the near-infrared camera.
Webb Space Telescope "selfie" images, taken by a specialized pupil imaging lens inside the near-infrared camera, which is used only for engineering and calibration and is not used during scientific observations.
Over the next few weeks, Webb's team will align and focus on the 18 points captured by each of the 18 lenses, and then superimpose these points to form a unified image of Webb's 18 mirrors, which shows this process in detail.
Credit:NASA
Then when the temperature of The Webb instrument dropped to the operating temperature, the Webb Space Telescope began working, expecting to send back its first spectacular scientific image this summer.
reference:
https://blogs.nasa.gov/webb/2022/02/11/photons-received-webb-sees-its-first-star-18-times/