Odysseus
Legend
Trump = Disaster
Posts: 41,098
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Post by Odysseus on Jul 12, 2022 3:03:40 GMT
Presumably in the graphic above/below, the sun shields all sort of fan out to protect the telescope/camera from the sun's rays. I suppose.
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Odysseus
Legend
Trump = Disaster
Posts: 41,098
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Post by Odysseus on Jul 12, 2022 3:11:48 GMT
Here's an animation of the sunshield deployment:
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Odysseus
Legend
Trump = Disaster
Posts: 41,098
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Post by Odysseus on Jul 12, 2022 3:16:59 GMT
And here is the sunshield on the ground being test-deployed. Turns out the multiple layers (five in all) are there to provide protection from both the 185F temps on the sun side, and the extremely low temps on the dark side.
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Odysseus
Legend
Trump = Disaster
Posts: 41,098
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Post by Odysseus on Jul 12, 2022 3:24:10 GMT
And a pdf file on the sunshield development:
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Odysseus
Legend
Trump = Disaster
Posts: 41,098
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Post by Odysseus on Jul 12, 2022 4:02:54 GMT
But wait there's more. Wednesday PBS will be playing a one hour show on the Webb: www.pbs.org/wgbh/nova/video/ultimate-space-telescope/Nova Ultimate Space Telescope 56 min Explore the dramatic story of NASA's James Webb Space Telescope-the most ambitious observatory ever launched-through a series of high-stakes milestones, from its conception to completion. |
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Post by Fiddler on Jul 12, 2022 16:23:04 GMT
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Post by Fiddler on Jul 12, 2022 16:24:42 GMT
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Post by Fiddler on Jul 12, 2022 16:26:48 GMT
JW - Southern Ring Nebula
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Post by Fiddler on Jul 12, 2022 18:19:26 GMT
Same section of sky.. Hubble v Webb.. Interesting .. In both images the spikes around the nearby stars are from the secondary mirror mount. Hubble uses a 4 point mount .. JW uses a 3 point mount..
It's an artifact often seen in reflecting telescopes.. I see 4 point diffraction spikes in my 13" Dobsonian but none in my Celestron 8 as its secondary is mounted to lens ahead of the primary mirror.
However those supports are configured determines the shape of the spikes, with each unique support creating its own diffraction spikes that are perpendicular to that support structure itself.
The Hubble Space Telescope, whose images are arguably the most ubiquitous and recognizable of all telescopes in human history, is configured in a typical way for a reflecting telescope: with supports for the secondary mirror shaped like the “+” sign. Its perpendicular supports ensure that there will be heavy diffraction spikes making a “+” shape coming off of every source that qualifies as point-like: the individual stars it can see.
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Odysseus
Legend
Trump = Disaster
Posts: 41,098
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Post by Odysseus on Jul 12, 2022 18:50:06 GMT
Also known as artifacts.
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Post by atreyu on Jul 14, 2022 22:51:50 GMT
You may enjoy this deeper analysis of the photos that were released the following day.
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Post by Maestro on Jul 14, 2022 22:53:12 GMT
You may enjoy this deeper analysis of the photos that were released the following day.
Thank you. I'll definitely take a look. |
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