First image from the JWST!!

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Ron Schmit
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First image from the JWST!!

Post by Ron Schmit »

A single star... or is that 18?
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merle
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Re: First image from the JWST!!

Post by merle »

Since JWST is reported to be able to "look back in time", would it be this might represent the star cluster our sun was part of billions of years ago. The elongated disks of pre-planetary matter.
:-)
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matt_2018
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Re: First image from the JWST!!

Post by matt_2018 »

We have people in the club who can help with collimation...
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setnes
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Re: First image from the JWST!!

Post by setnes »

matt_2018 wrote: Fri Feb 11, 2022 2:41 pm We have people in the club who can help with collimation...
Let me know when you get up there, we'll stay here and tell you which screws to turn. :)
rwcooper
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Re: First image from the JWST!!

Post by rwcooper »

I waited 15 years and spent $10 billion dollars and all I got was this lousy Strehl ratio of 0.0001. - Chris Burke
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Ron Schmit
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Re: First image from the JWST!!

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[attachment=0]Screenshot_20220211-174053_Google News.jpg[/attachment]

This shows which image is from which mirror.
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Frank Kenney
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Re: First image from the JWST!!

Post by Frank Kenney »

I feel so much better now, diffraction spikes and all, after taking this image when I first heard it would be the one.
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Deane Clark
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Re: First image from the JWST!!

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A nice short video on the first light image and the collimation procedure:
https://youtu.be/QlwatKpla8s
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Dick Jacobson
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Re: First image from the JWST!!

Post by Dick Jacobson »

Superb video! Another interesting factoid, the alignment star HD84406 is actually too bright for routine imaging.
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Re: First image from the JWST!!

Post by setnes »

I've been scratching my head trying to understand how they determined which star was from which mirror. They eluded to it in the video, but didn't come out and say it exactly. Are they using the "selfie" images to determine which mirror is brighter for each sub exposure in the mosaic? If so, that's pretty cool. If that's not how they're doing it, I'm still scratching my head.
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Re: First image from the JWST!!

Post by bsk1947 »

I had the same question... Could they be using star shapes to identify the mirror corresponding to an image?
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Ron Schmit
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Re: First image from the JWST!!

Post by Ron Schmit »

Here are the stars lined up with the corresponding mirror segments.
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JWST Mirror Segments per Star.png
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petemn2004
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Re: First image from the JWST!!

Post by petemn2004 »

Could be that once they found the star images in the mosaic, they moved each mirror one at a time and took a photo after each mirror movement to see which star image moved.
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merle
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Re: First image from the JWST!!

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"We are pointing the telescope at a bright, isolated star (HD 84406) to capture a series of images that are then stitched together to form a picture of that part of the sky. We don’t have just one mirror looking at this star; we have 18 mirrors, each of which is initially tilted towards a different part of the sky. As a result, we’ll actually capture 18 slightly shifted copies of the star – each one out of focus and uniquely distorted. We refer to these initial star-copies as 'segment images.'

One by one, we will move the 18 mirror segments to determine which segment creates which segment image. After matching the mirror segments to their respective images, we can tilt the mirrors to bring all the images near a common point for further analysis. We call this arrangement an 'image array.'"

https://webb.nasa.gov/content/webbLaunc ... sWebb.html
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setnes
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Re: First image from the JWST!!

Post by setnes »

Thanks Merle. That validates Mark's theory.

It also means this had nothing to do with it. :)


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Ron Schmit
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Re: First image from the JWST!!

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Cooling down!!
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Current status.
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bsk1947
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Re: First image from the JWST!!

Post by bsk1947 »

Thanks for sharing!
Looks like cooling is quicker away from the shield.
Did they turn on the fans for cooling it down?! ...
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setnes
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Re: First image from the JWST!!

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Did they turn on the fans for cooling it down?! ...
Fans in space?
bsk1947
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Re: First image from the JWST!!

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Sorry, that was an attempted joke... it failed... :-)
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Deane Clark
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Re: First image from the JWST!!

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bsk1947 wrote: Fri Feb 18, 2022 10:32 am Sorry, that was an attempted joke... it failed... :-)
I got it :-D

I was going to suggest they should have made the whole thing out of SMAs ;-)
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Dick Jacobson
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Re: First image from the JWST!!

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Deane Clark wrote: Fri Feb 18, 2022 10:42 am
bsk1947 wrote: Fri Feb 18, 2022 10:32 am Sorry, that was an attempted joke... it failed... :-)
I got it :-D

I was going to suggest they should have made the whole thing out of SMAs ;-)
What's an SMA?
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Too many small scopes and binoculars to mention
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Ron Schmit
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Re: First image from the JWST!!

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The SMA is the Secondary Mirror Assembly.
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Labeled here as the "Secondary Mirror"
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Deane Clark
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Re: First image from the JWST!!

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Another attempted “joke”. The SMA is the dark blue circle in the upper right, the coldest mirror “segment” at 30.82K.
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Dick Jacobson
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Re: First image from the JWST!!

Post by Dick Jacobson »

So the Webb is just like my Newtonians. The secondary mirror always gets coldest and dewy/frosty, putting an end to my observing session.
30-inch homemade Newtonian with periscope
20-inch homemade equatorial Newtonian with periscope
14-inch homemade equatorial Newtonian
10-inch Newtonian that folds flat
6-inch Russian Maksutov-Newtonian on Vixen equatorial mount
Too many small scopes and binoculars to mention
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merle
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Re: First image from the JWST!!

Post by merle »

Dick Jacobson wrote: Sat Feb 19, 2022 1:15 pm So the Webb is just like my Newtonians. The secondary mirror always gets coldest and dewy/frosty, putting an end to my observing session.
Hope they packed a hair dryer....


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