James Webb Space Telescope, information, updates and discussion |
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James Webb Space Telescope, information, updates and discussion |
 Jan 17 2022, 05:16 PM
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#181
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 Senior Member  Group: Members Posts: 2082 Joined: 13-February 10 From: Ontario Member No.: 5221  |
An individual mirror segment deployment tracker is on display! (that's enough detail for anyone!)
https://webb.nasa.gov/content/webbLaunch/wh...ml?units=metric |
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Jan 18 2022, 01:12 PM
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#182
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Member Group: Members Posts: 910 Joined: 4-September 06 From: Boston Member No.: 1102 |
They are cranking on moving the mirrors. Down to 2.0 mm on all mirrors except A3 and A6 which still have 12.3mm to go. Somehow A3 and A6 get measured differently and are moved after all the others. The mirrors are cooling down, now at -206C on way to -233C. Webb is 93% the way to L2 and the insertion burn is in about 5 days.
Go Webb!! -------------------- |
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Jan 18 2022, 10:06 PM
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#183
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 Member Group: Members Posts: 723 Joined: 13-June 04 Member No.: 82 |
Now down to 0.0mm for all segments but A3 and A6, which are down to -10.0mm.
Really motoring!
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Jan 18 2022, 10:19 PM
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#184
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 Member Group: Members Posts: 684 Joined: 24-July 15 Member No.: 7619 |
QUOTE (Floyd @ Jan 18 2022, 01:12 PM)  They are cranking on moving the mirrors. Down to 2.0 mm on all mirrors except A3 and A6 which still have 12.3mm to go. Somehow A3 and A6 get measured differently and are moved after all the others. A3 & A6 are a bit wonky at calibration, so IIRC they got calibration data on all the other mirrors to help guestimate / constrain the measurements. IIRC, stress/strain gauges used to measure alignment didn't cooperate after assembly, so they're working out correct mirror position based on a proxy measurement like of total current through the adjustment motors? So AFAIK, (somebody please correct this because I'm sure it's wrong in one or many ways) they measured mirror displacement and total motor current to be able to figure out mirror displacement based on net current, after the direct measurement mechanism on A3 & A6 went wonky. |
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Jan 18 2022, 10:24 PM
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#185
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Member Group: Members Posts: 910 Joined: 4-September 06 From: Boston Member No.: 1102 |
Thanks for presenting your understanding of what makes A3 and A6 different--very likely mostly correct..
 The movement of the mirrors was substantially faster than 1mm/day--so moving faster than grass grows by 2-4x.  
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Jan 19 2022, 02:33 PM
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#186
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Member Group: Members Posts: 723 Joined: 13-June 04 Member No.: 82 |
All segments now at 0.0mm:
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Jan 23 2022, 09:54 PM
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#187
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Junior Member Group: Members Posts: 43 Joined: 13-June 08 Member No.: 4206 |
Do the motors that performed the mirror extension out of launch position also adjust positioning and tilting?
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Jan 24 2022, 02:33 AM
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#188
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 Member Group: Members Posts: 259 Joined: 23-January 05 From: Seattle, WA Member No.: 156 |
That's my understanding.
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Jan 24 2022, 08:55 PM
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#189
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Member Group: Members Posts: 228 Joined: 14-January 22 Member No.: 9140 |
JWST has entered its mission orbit around L2! The next steps are to focus the mirrors, cool down passively, and prepare for science to begin.
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Jan 24 2022, 10:39 PM
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#190
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 Member Group: Members Posts: 191 Joined: 20-November 06 From: Saint Louis Member No.: 1376 |
Such exciting news! This whole journey has had just the right amount of drama. And by that, I mean none. Well done to that team. I can't wait until we see the first image in several months!
-------------------- - Matt
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Feb 11 2022, 03:34 PM
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#191
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Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Webb first image (and a selfie to boot!).
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Feb 11 2022, 08:42 PM
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#192
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Senior Member Group: Members Posts: 2998 Joined: 30-October 04 Member No.: 105 |
QUOTE (charborob @ Feb 11 2022, 10:34 AM) Webb first image (and a selfie to boot!). A first baby-step of many!! --Bill -------------------- |
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Feb 14 2022, 03:46 AM
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#193
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Senior Member Group: Members Posts: 2082 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Even more detail on this tracking page has been added:
https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html Now including instrument temperatures, mirror steps too. |
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Feb 19 2022, 04:55 PM
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#194
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Member Group: Members Posts: 191 Joined: 20-November 06 From: Saint Louis Member No.: 1376 |
More forward progress:
Webb Team Brings 18 Dots of Starlight into Hexagonal Formation https://blogs.nasa.gov/webb/2022/02/18/webb...onal-formation/ -------------------- - Matt
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Mar 16 2022, 09:07 PM
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#195
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 Member Group: Members Posts: 444 Joined: 1-July 05 From: New York City Member No.: 424 |
NASA held an informative press conference today to announce completion of alignment of the JWST’s primary mirror and the capture of a fully-focused image. I watched it on a live stream and since then haven’t been able to find an archived copy. (My track record for finding archived copies of NASA and JPL press conferences is remarkably poor.)
Here’s an early press account, from New Scientist. https://www.newscientist.com/article/231264...rest-image-yet/ |
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