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The unfurling of Webb’s sun shield begins

Engineers have begun the multi-day unfurling and deployment of the sun shield on the James Webb Space Telescope.

The first step is to deploy two booms on each side of the telescope that draw the shield itself outward.

The deployment of the first boom was held up several hours to give engineers time to make sure the protective covers had, in fact, rolled off to the side of the sunshade pallets as required.

“Switches that should have indicated that the cover rolled up did not trigger when they were supposed to,” NASA said in a blog post. “However, secondary and tertiary sources offered confirmation that it had.”

“The deployment of the five telescoping segments of the motor-driven mid-boom began around 1:30 p.m., and the arm extended smoothly until it reached full deployment,” NASA said.

Engineers then sent commands to deploy the second sunshade boom, which extended smoothly and locked in place at 10:13 p.m., finally giving Webb its iconic kite-like shape.

Next the shield has to be tightened in place, which will also separate and tighten in place the shield’s five layers. According to the schedule, the four layers will be tensioned today, with the fifth tomorrow.

The step-by-step deployment is outlined in detail here, and updates to the most recently completed step after it is finished.

Genesis cover

On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.

 

The print edition can be purchased at Amazon. from any other book seller, or direct from my ebook publisher, ebookit. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.


The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
 

"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News

4 comments

  • Frank Solomon

    Bob, if possible, I’d like to see a time zone added to the date / time-stamps at the upper left of your posts, and the post comments. This might help gauge things in time. For example, this post says 5:18 PM, the embedded quote from CBS News has its own 8:25 PM time stamp, and that quote says sunshade boom lock-in happened at 10:13 PM. Carefully reading the CBS News article, I saw its 12-31-21 date. This might not matter so much ordinarily, but JWST has a high event-density, and at least for me, it becomes difficult to build an accurate picture of the latest JWST developments, across the sources. I definitely acknowledge that this issue seems to happen frequently across JWST reporting generally, not just BtB.

    Thanks!

  • Andrew_W

    On the site you link to “sunshield layer tensioning” : “rescheduled”.

    Anyone know why the delay?

  • Andrew_W: It appears they decided to simply take the day off after a week of continuous work. It is Sunday after all.

  • It also appears that they wanted the extra time to get the telescope’s power system fully charged.

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