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NASA's James Webb Space Telescope on track for Dec. 22 launch

An illustration of the James Webb Space Telescope
An illustration of the James Webb Space Telescope (Image credit: ESA)

NASA's much-delayed James Webb Space Telescope remains on track to launch next month.

Further testing on the huge observatory has confirmed that Webb's liftoff, atop an Ariane 5 rocket from French Guiana, is still targeted for Dec. 22, NASA officials wrote in a blog post last week (opens in new tab)

The $9.8 billion Webb has experienced years of technical delays, funding issues and a pandemic. And it suffered another delay, albeit a slight one, earlier this month during its final preparations for launch. 

Related: NASA needs a new telescope, ASAP, to find Earth's twin

On Nov. 22, NASA reported that a clamp band that holds Webb to its launch vehicle adapter had released unexpectedly recently (opens in new tab), causing vibrations throughout the telescope. The incident required further investigation, pushing back the observatory's launch date from its target (at the time) of Dec. 18.

Last week's blog post reports that technicians have performed more testing following the incident, clearing the way for Webb to launch on Dec. 22.

"Engineering teams completed ... tests, and a NASA-led anomaly review board concluded no observatory components were damaged in the incident," the agency wrote in the Nov. 24 blog post. 

NASA and its Webb partners next ran a "consent to fuel" review, which was approved, to begin tanking up the Arianespace Ariane 5 rocket. With that milestone passed, fueling began on Nov. 25 and is expected to last 10 days.

Webb's journey will only just begin after reaching space. It will take Webb a month (opens in new tab) to get to its destination, a stable gravitational location in space known as a Lagrange point (opens in new tab). Once it gets to that spot, which lies about 930,000 miles (1.5 million kilometers) from Earth, Webb will spend six months in a commissioning period to ensure its complex mirror unfolds and that all instruments are ready for observations.

It's unclear where Webb will turn its attention first, but the telescope's "early release science programs" include a range of programs in planets, the solar system, galaxies, black holes, stellar physics and star populations. 

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Elizabeth Howell
Elizabeth Howell
Elizabeth Howell is a regular contributor to Live Science and Space.com, along with several other science publications. She is one of a handful of Canadian reporters who specializes in space reporting. Elizabeth has a Bachelor of Journalism, Science Concentration at Carleton University (Canada) and an M.Sc. Space Studies (distance) at the University of North Dakota. Elizabeth became a full-time freelancer after earning her M.Sc. in 2012. She reported on three space shuttle launches in person and once spent two weeks in an isolated Utah facility pretending to be a Martian.