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  [Discuss] James Webb Space Telescope (Page 3)

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Author Topic:   [Discuss] James Webb Space Telescope
Robert Pearlman
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Posts: 47979
From: Houston, TX
Registered: Nov 1999

posted 01-08-2022 08:27 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA live video
Watch James Webb Space Telescope experts give real-time updates on the final step in the observatory’s deployment: the unfolding of the second of Webb’s two primary mirror wings. Engineers in mission control will send commands to deploy the wing and latch it into place, a process that takes several hours. The deployment will complete the mirror's golden honeycomb-like structure, and will mark the end of an unprecedented 14-day unfolding process.

Scott
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Posts: 3328
From: Houston, TX
Registered: May 2001

posted 01-10-2022 06:41 AM     Click Here to See the Profile for Scott   Click Here to Email Scott     Edit/Delete Message   Reply w/Quote
Wonderful!

Blackarrow
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Posts: 3423
From: Belfast, United Kingdom
Registered: Feb 2002

posted 01-10-2022 10:23 AM     Click Here to See the Profile for Blackarrow     Edit/Delete Message   Reply w/Quote
After painful memories of the Skylab micrometeoroid shield and the Galileo high-gain antenna, I confess to feelings of trepidation before the unfolding of the Webb sunshield and mirror-assembly. But it looks like they did it! Well done to NASA and to all the individuals involved!

David C
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Posts: 1325
From: Lausanne
Registered: Apr 2012

posted 01-10-2022 01:24 PM     Click Here to See the Profile for David C     Edit/Delete Message   Reply w/Quote
A big relief.

Jim Behling
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From: Cape Canaveral, FL
Registered: Mar 2010

posted 01-13-2022 08:56 AM     Click Here to See the Profile for Jim Behling   Click Here to Email Jim Behling     Edit/Delete Message   Reply w/Quote
Ye of little faith.

Blackarrow
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Posts: 3423
From: Belfast, United Kingdom
Registered: Feb 2002

posted 01-13-2022 05:59 PM     Click Here to See the Profile for Blackarrow     Edit/Delete Message   Reply w/Quote
There is blind faith and there is legitimate concern.

Headshot
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Posts: 1054
From: Vancouver, WA, USA
Registered: Feb 2012

posted 01-21-2022 12:42 PM     Click Here to See the Profile for Headshot   Click Here to Email Headshot     Edit/Delete Message   Reply w/Quote
I read that that Webb's MCC2 burn is now scheduled for 24 Jan and not 23 Jan. Does this mean Webb is going slower than originally planned? If so, will that change the amount of propellant needed to kick it into its L2 halo orbit?

Common sense tells me that less fuel will be required, which will extend Webb's useful operational life. Am I correct?

SpaceAholic
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Posts: 5030
From: Sierra Vista, Arizona
Registered: Nov 1999

posted 01-21-2022 12:58 PM     Click Here to See the Profile for SpaceAholic   Click Here to Email SpaceAholic     Edit/Delete Message   Reply w/Quote
Traveling slower than a cruising jet liner now (490 MPH)... must be poor tailwinds.

Robert Pearlman
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Posts: 47979
From: Houston, TX
Registered: Nov 1999

posted 01-24-2022 02:08 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
The James Webb Space Telescope is now in orbit at Lagrange Point 2 (L2).

Robert Pearlman
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Posts: 47979
From: Houston, TX
Registered: Nov 1999

posted 01-24-2022 03:17 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Headshot:
Does this mean Webb is going slower than originally planned?
Keith Parrish, the observatory manager at NASA's Goddard Space Flight Center, said today that the move of the orbit insertion burn by one day was a product of the performance of the first two burns and the logistics of bringing together the entire international team.

Monday just worked better for everyone and came at no fuel penalty.

SkyMan1958
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Posts: 1177
From: CA.
Registered: Jan 2011

posted 01-25-2022 09:48 PM     Click Here to See the Profile for SkyMan1958   Click Here to Email SkyMan1958     Edit/Delete Message   Reply w/Quote
According to Gizmodo, a robotic telescope in Italy has caught a faint glimpse of JWST. There is a picture of JWST at L2. It looks like a dot.

damnyankee36
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Posts: 47
From: Alamogordo, NM USA
Registered: Aug 2017

posted 01-26-2022 12:56 PM     Click Here to See the Profile for damnyankee36   Click Here to Email damnyankee36     Edit/Delete Message   Reply w/Quote
I saw that story and was wondering how much better Hubble could do? I know there have been questions if, and the reasons why, Hubble can't see the Apollo landing sights.

Are we looking at the same limitations with Hubble observing JWST as well?

Jim Behling
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Posts: 1708
From: Cape Canaveral, FL
Registered: Mar 2010

posted 01-26-2022 01:18 PM     Click Here to See the Profile for Jim Behling   Click Here to Email Jim Behling     Edit/Delete Message   Reply w/Quote
Yes.

Robert Pearlman
Editor

Posts: 47979
From: Houston, TX
Registered: Nov 1999

posted 01-26-2022 01:25 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Also keep in mind that the only thing any telescope (however powerful) could see would be the sunshield. By design, the sunshield blocks the rest of the Webb from Earth, the moon and the sun.

SpaceAholic
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Posts: 5030
From: Sierra Vista, Arizona
Registered: Nov 1999

posted 01-26-2022 01:34 PM     Click Here to See the Profile for SpaceAholic   Click Here to Email SpaceAholic     Edit/Delete Message   Reply w/Quote
The spacecraft bus, solar panels and high gain antenna array would not be obstructed by the sunshield.

oly
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Posts: 1355
From: Perth, Western Australia
Registered: Apr 2015

posted 03-03-2022 07:25 PM     Click Here to See the Profile for oly   Click Here to Email oly     Edit/Delete Message   Reply w/Quote
Here is an interesting behind the scenes look at the JWST sun shield done by the Smarter Every Day YouTube channel:

Robert Pearlman
Editor

Posts: 47979
From: Houston, TX
Registered: Nov 1999

posted 03-16-2022 10:56 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA video
Following the completion of critical mirror alignment steps, the James Webb Space Telescope team has great confidence that the observatory's optical performance will meet or exceed the science goals it was built to achieve.

On March 11, the Webb team completed the stage of alignment known as "fine phasing" – and at this key stage in the commissioning of Webb's Optical Telescope Element, every optical parameter that has been checked and tested is performing at, or above, expectations. The team found no critical issues and no measurable contamination or blockages to Webb's optical path. The observatory is able to successfully gather light from distant objects and deliver it to its instruments without issue.

Although there are months to go before Webb ultimately delivers its new view of the cosmos, achieving this milestone means the team is confident that Webb's first-of-its-kind optical system is working as well as possible.


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