[Lex Computer & Tech Group/LCTG] where is Webb

Tue Dec 28 20:39:25 PST 2021

A Telescope’s Long Journey - Scientific American, Jan 2022
Great illustrations & description.
    – Mike Alexander

https://www.scientificamerican.com/article/what-is-a-lagrange-point/

    Mike Alexander

On Tuesday, December 28, 2021, 11:10 PM, Michael Alexander <mna.ma at yahoo.com> wrote:

Thanks, Larry.

    – Mike Alexander

On Tuesday, December 28, 2021, 9:52 PM, L Wittig <9423lew at gmail.com> wrote:

Per wikipedia about L2: Sun–Earth L2 is a good spot for space-based observatories. Because an object around L2 will maintain the same relative position with respect to the Sun and Earth, shielding and calibration are much simpler. It is, however, slightly beyond the reach of Earth's umbra,[24] so solar radiation is not completely blocked at L2. 
Webb will see a ring of the sun like a full eclipse. It needs some sun for the solar panels to work.

On Tue, Dec 28, 2021 at 6:16 PM George Gamota <ggamota at stma-llc.com> 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
cell: +1 781-266-8799
https://www.linkedin.com/in/quatrano/

Board Member | The Right Question Institute
http://www.rightquestion.org

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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 realtime 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

<image001.png>

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