James Webb Telescope Completes Calibration and Sends Test Images of Milky Way Satellite Galaxy

The instruments of the space observatory work better than even the most optimistic forecasts.

The fact that NASA has completed the focusing of the James Webb telescope was announced by the agency on the night of April 29. The specialists successfully calibrated all segments of the primary and secondary mirrors so that they transmit a clear image to the sensors of the space observatory.

NASA has published a series of test shots that experts took using each imaging tool during the focusing of the mirrors. For this test, Webb was sent to the Large Magellanic Cloud, the largest and most massive satellite galaxy of the Milky Way, located at a distance of 50 kiloparsecs from it.

The main mirror of the observatory continues to cool to the required temperature. At the end of April, NASA began commissioning scientific instruments, which will take about two months. The James Webb Telescope is expected to begin full-fledged scientific work in July 2022.

NIRCam (near infrared camera)

Fine Guidance Sensor (FGS)

Near Infrared Spectrograph (NIRSpec)

MIRI and NIRISS devices for operation in the near and middle ranges of infrared radiation

All test shots


These are not the first images that “James Webb” managed to send to Earth. In February 2022, he captured the sun-like star HD 84406 and took a selfie.

The James Webb telescope sent the first “images” from space – including selfie

Editorial articles

The shooting process lasted about 25 hours.



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