NASA embarks on 3-month alignment of Webb telescope's massive mirror

NASA has started the tedious, precise job of aligning 18 sections of the James Webb Space Telescope's giant golden mirror.

The mirror had to be large enough to capture infrared light from the universe's earliest galaxies, but also had to be sectioned and folded in order to build and launch.

Now, NASA engineers and astronomers will attempt to reposition all 18 hexagonal sections so they match up almost perfectly -- to within 50 nanometers. A human hair is about 90,000 nanometers wide.

To do that, the Webb team sends commands through space to Webb's position a million miles from Earth and looks at images the observatory's sensors have started to collect. The alignment process officially began on Sunday.

Those images are blurry because the mirror is not aligned yet, and NASA is not making them public. But even such blurry images were a treat to see for people who have worked for decades on the project, NASA's Lee Feinberg said in an interview.

"I was very energized by what I saw," said Feinberg, a telescope manager at the space agency. "We had an idea of what to expect from simulations, and this matched those sims almost perfectly."

The $10 billion Webb observatory can see further than the Hubble Space Telescope, but it sees the universe in infrared light, whereas Hubble detects visible light. Both may be in operation for years simultaneously.

The very first light to hit Webb, which launched on Dec. 25, came from a star 258.5 light-years away in the Big Dipper or Ursa Major constellation -- known as HD 84406.

While heartened, Feinberg and the teams of people working on the alignment realize there's still much work to be done, he said. Overall, Webb's launch and deployment to its orbital location have been very successful.

"We're still early so you got to remember that you only draw some conclusions early."

It's all part of Webb's commissioning process, according to NASA and the Maryland-based Space Telescope Science Institute which operates all the nation's space telescopes, including Hubble and Webb.

Once Webb is aligned, each of its instruments will be tested in various modes, which will complete the six-month commissioning process.

NASA plans to release the first public images as soon as possible in that process, but hasn't planned a release date, NASA's Jane Rigby said in a teleconference Friday.

Neither has the agency announced the space targets for those images.

"When the science instrument modes have been approved as ready for science, there will be a big public release of the early release observations. These are designed to be on the front pages of media all around the world," said Rigby, a Webb operations project scientist.

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Webb team begins aligning the telescope
Washington DC (SPX) Feb 04, 2022
This week, the three-month process of aligning the telescope began - and over the last day, Webb team members saw the first photons of starlight that traveled through the entire telescope and were detected by the Near Infrared Camera (NIRCam) instrument. This milestone marks the first of many steps to capture images that are at first unfocused and use them to slowly fine-tune the telescope. This is the very beginning of the process, but so far the initial results match expectations and simulations. ... read more