One of the Webb's instruments is offline. The NIRISS suffered a communications error and timed out. No word on when it will be online.
NIRISS complements the other instruments on the JWST by providing “unique observational capabilities between 0.6 and 5 ?m,” according to the Space Telescope Science Institute. It’s used to investigate exoplanet atmospheres, to detect first light, aka the Era of Recombination, and to detect exoplanets. It can also capture wide-field instruments to study populations of objects and has multiple filters that increase its versatility.
The Canadian Space Agency built the NIRISS as part of its contribution to the JWST mission. It also built the Fine Guidance Sensor , which is physically combined with the NIRISS but is a separate instrument. It’s unclear when the instrument will be back online, but it’s bad news for observers. Observing time on the JWST is in high demand, and it’s not clear how this delay will affect observations.
This isn’t the first mishap the JWST has had to deal with. It went into safe mode for about three weeks in December due to a software fault in its attitude control system. The telescope’s MIRI was also briefly non-operational.
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James Webb Space Telescope experiences 2nd instrument glitchMeghan is a senior writer at Space.com and has more than five years' experience as a science journalist based in New York City. She joined Space.com in July 2018, with previous writing published in outlets including Newsweek and Audubon. Meghan earned an MA in science journalism from New York University and a BA in classics from Georgetown University, and in her free time she enjoys reading and visiting museums. Follow her on Twitter at meghanbartels.
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