After Million-Mile Journey, James Webb Telescope Reaches Destination


Deploying the telescope to the L2 neighborhood additionally helps hold the temperatures low whereas offering sufficient daylight for the Webb’s photo voltaic panels, which generate electrical energy. But the telescope isn’t parked at exactly L2 — it would revolve across the level’s middle as soon as each 180 days in an orbital ring some 500,000 miles broad to reveal its photo voltaic arrays to daylight.

“If we were perfectly there, we would be blocked by the Earth, such that we wouldn’t get our electricity,” mentioned Scott Willoughby, the telescope’s program supervisor at Northrop Grumman, the first contractor for the observatory. “So we do this halo orbit.”

Stationing the spacecraft at this distance from Earth may also assist preserve its restricted gasoline provides.

“If you try to stay closer, you’ve got to expend fuel to stay there,” Mr. Willoughby mentioned. But much less gasoline is required to station the Webb at L2, he mentioned, “meaning the mission life for this vehicle will be the longest.” This month, one mission official instructed that the spacecraft might stay operational for as much as 20 years.

“The last 30 days, we call that 30 days on the edge, and we’re just so proud to be through that,” mentioned Keith Parrish, NASA’s commissioning supervisor for the telescope, in a information convention on Monday. “But on the other hand, we were just setting the table.”

With the telescope’s devices deployed and its arrival at L2 full, months of smaller steps lie forward earlier than these of us on Earth can start to see the spacecraft’s vivid views of the cosmos. For the subsequent three months, engineers will watch as algorithms assist fine-tune the place of the Webb’s mirror segments, correcting any misalignments — as precisely as one-10,000th of a hair — to permit the 18 hexagonal items in its array to perform as a single mirror.

Engineers should then calibrate the Webb’s scientific devices, check its capability to lock onto recognized objects and observe shifting targets earlier than astronomers can use the telescope for science operations starting this summer season. Amber Straughn, a deputy challenge scientist for the telescope, mentioned throughout a NASA on-line broadcast on Monday that the primary yr of observations utilizing the Webb have already been scheduled.

“The best is yet to come,” Mr. Parrish mentioned.



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