[Lex Computer & Tech Group/LCTG] where is Webb
Tony
galaitsis at verizon.net
Tue Dec 28 17:42:09 PST 2021
Supplement to address Carl's question:
Remember that the earth totally eclipses the moon (when suitably
aligned), which is about 1/4 million miles away and has a ~2000-mi
diameter (3,468 KM). So, at 1 million miles distance (4 times the
Earth-Moon distance) the earth could eclipse an object that has a 500
miles diameter. SO, the telescope will truly be a piece of cake in that
shadow.
Tony
=======
On 12/28/21 6:16 PM, George Gamota wrote:
>
> The location of the Webb is such that only some square feet need to be
> blocking the sun. Some geometry here helps.
>
> *From:* Carl Lazarus <carllazarus at comcast.net>
> *Sent:* Tuesday, December 28, 2021 5:14 PM
> *To:* 'George Gamota' <ggamota at stma-llc.com>; 'Stephen Quatrano'
> <stefanoq at gmail.com>; jjrudy1 at comcast.net
> *Cc:* 'Lex Computer Group' <lctg at lists.toku.us>
> *Subject:* RE: [Lex Computer & Tech Group/LCTG] where is Webb
>
> Is Earth’s shadow large enough to completely block the sun from the
> James Webb telescope? I thought the telescope has an elaborate sun
> shield.
>
> -- Carl
>
> *From:* LCTG <lctg-bounces+carllazarus=comcast.net at lists.toku.us> *On
> Behalf Of *George Gamota
> *Sent:* Tuesday, December 28, 2021 3:41 PM
> *To:* 'Stephen Quatrano' <stefanoq at gmail.com>; jjrudy1 at comcast.net
> *Cc:* 'Lex Computer Group' <lctg at lists.toku.us>
> *Subject:* Re: [Lex Computer & Tech Group/LCTG] where is Webb
>
> Basically the Webb would be fried (electronics burned) if it ever sees
> the sun. So L2 places it in such a way that the Earth blocks the sun
> (an eclipse) all the time. Thus the Webb goes around the sun with
> Earth. Webb’s orbit then is one year just as the Earth.
>
> George.
>
> *From:* LCTG <lctg-bounces+ggamota=stma-llc.com at lists.toku.us> *On
> Behalf Of *Stephen Quatrano
> *Sent:* Tuesday, December 28, 2021 1:08 PM
> *To:* jjrudy1 at comcast.net
> *Cc:* Lex Computer Group <lctg at lists.toku.us>
> *Subject:* Re: [Lex Computer & Tech Group/LCTG] where is Webb
>
> Great graphics, John. I didn’t understand L2 orbit so I Googled it:
>
> "The space telescope is destined to orbit a point in space known as
> Earth-sun Lagrange point 2 or L2, which is located nearly 1 million
> miles (1.5 million kilometers) away from Earth on the opposite side
> as the sun. The spacecraft covered the first 10% of that journey
> within 12 hours of launching.”
> https://www.space.com/james-webb-space-telescope-trajectory-burn
>
> "The James Webb Space Telescope will not orbit the Earth like Hubble
> but will in fact orbit the Sun. It will travel for approximately 30
> days before reaching what is known as the second Lagrange point, or
> L2, 1 million miles away.”
> https://deepfieldfilm.com/discover/james-webbs-halo-orbit
>
> Looking at the second animation, I’m still not sure I understand it…
> but I keep trying.
>
> Regards,
>
> Stephen Quatrano
> CEO and Cofounder | Meema, Inc
> web: http://meemastories.com
> email: stephen.quatrano at meemastories.com
> <mailto:stephen.quatrano at meemastories.com>
> cell: +1 781-266-8799
> https://www.linkedin.com/in/quatrano/
>
> Board Member | The Right Question Institute
> http://www.rightquestion.org
>
> Lifelong Learner
> http://www.howdoweknow.info/p/home.html
> http://stefano.quatrano.us/
>
> On Dec 28, 2021, at 12:35 PM, <jjrudy1 at comcast.net>
> <jjrudy1 at comcast.net> wrote:
>
> This is a nice NASA site that shows its location in
> realtimehttps://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html
> <https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html>
>
> John Rudy
>
> 781-861-0402
>
> 781-718-8334 cell
>
> 13 Hawthorne Lane
>
> Bedford MA
>
> jjrudy1 at comcast.net <mailto:jjrudy1 at comcast.net>
>
> <image001.png>
>
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