James Webb Space Telescope general discussion thread

This is potentially bad news:

The medium resolution spectroscopy mode of the MIRI (Mid Infrared Imager) is malfunctioning. There is a motorized ‘grating wheel’ in that mode allowing different diffraction gratings to be selected, and this wheel is exhibiting high resistance to turning, As a result, that whole mode of the MIRI instrument is offline until and if they solve the problem.

MIRI has four modes. The other three are still operating normally.

No updates on this …?
NASA’s JWST blog hasn’t been updated since 20th Sep.
Apparently the problem was discovered before 6th Sep !

In the finely detailed Webb’s First Deep Field image, the researchers zeroed in on what they’ve dubbed “the Sparkler galaxy,” which is nine billion light years away. This galaxy got its name for the compact objects appearing as small yellow-red dots surrounding it, referred to by the researchers as “sparkles.” The team posited that these sparkles could either be young clusters actively forming stars—born three billion years after the Big Bang at the peak of star formation—or old globular clusters. Globular clusters are ancient collections of stars from a galaxy’s infancy and contain clues about its earliest phases of formation and growth.

From their initial analysis of 12 of these compact objects, the researchers determined that five of them are not only globular clusters but among the oldest ones known.

Three and a half weeks and still no updates following the Sept 6 anomaly review board meeting?


Webb took one observation of the impact location before the collision took place, then several observations over the next few hours. Images from Webb’s Near-Infrared Camera (NIRCam)show a tight, compact core, with plumes of material appearing as wisps streaming away from the center of where the impact took place.