You can see it in detail by clicking on it.
It’s a picture of a star called 2MASS J175540426551277 in Dragon’s constellation and its surroundings. The total exposure time is about 2,100 seconds.
You can see galaxies in the distance around bright stars.
18m ground telescope observation and comparison
The telescope optics are almost completely aligned with the near-infrared camera NIRCAM that was photographed.
Since the intermediate infrared equipment and other scientific equipment have not yet been aligned, we plan to arrange these equipment in the future and then perform final optical calibration.
This time, mirror selfie images showing mirror alignment were released, and you can see that the brightness of the mirrors is quite even compared to when they were first released.
This means that all mirrors are focused on the camera exactly 99.
This photo was not taken by a camera outside the telescope, but by NIRCAM inside the telescope.
NIRCAM assembly hardware layout diagram and optical unit OTE incoming optical path blue
If you have used a reflective telescope, you may know that the optical axis of the optical section is twisted and out of focus, you can see the mirror through the eyepiece.
NIRCAM can mechanically insert a special lens from the optical path entering the image sensor and arbitrarily turn on the optical axis. This is called the Pewel Imaging Lens PIL.
The image taken when the PIL is inserted is used to feed back the state of the mirror surface during the mirror segment alignment process.
Thank you.
Reference
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