Re: Possibility of JWST flares and antiflares?

From: George Roberts via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 5 Jan 2022 19:54:41 -0500
On 1/5/22 4:51 PM, C. Bassa via Seesat-l wrote:
>
> sunshade to reflect sunlight back to Earth. As the sunshade is fixed
> to the telescope, whether the reflections reach Earth will depend on
> the location of JWST in its SEL2 orbit, as well as its pointing
> direction. This page shows that it can target angles from 85 to 135
> deg away from the sun:
> https://jwst-docs.stsci.edu/jwst-observatory-characteristics/jwst-observatory-coordinate-system-and-field-of-regard/jwst-target-viewing-constraints

Just in case you missed it "the sunshade is fixed to the telescope" 
means that when you aim the telescope at a star, the entire sunshield 
also has to move the same amount.  I think it's more obvious if you 
watch this animation showing the range of motion and range of targets 
starting at 6:20 in the video (link should jump you to that spot)
https://youtu.be/cp_7AJseYYc?t=380

It would be amazing if someone figured out exactly the angle/position of 
the sunshield versus the target that the telescope is pointing at.  With 
enough observations we can get this within an arc second I would think.  
Although keep in mind it rolls while filming so the field of view 
doesn't rotate. Yikes - maybe it's too unpredictable?

Anyway, being able to go onto heavens-above and get flare predictions 
for JWST would be fantastic.  We could see flares at any time including 
midnight (unlike most satellite flares).

- George



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Received on Wed Jan 05 2022 - 18:56:03 UTC

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