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Webb Space Telescope

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  • macona
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  • aostling
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    First star images are spectacular!

    https://www.youtube.com/watch?v=VwysUlbOGZk

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  • lakeside53
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    ya, they didn't even have slide rules!

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  • lynnl
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    All the more amazing is that much of the orbital mechanics involved was figured out in the 1700's. ...makes me feel even more stupid!

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  • aostling
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    Originally posted by lakeside53 View Post

    So.. Goggle is my friend... this is worth watching What Makes Lagrange Points Special Locations In Space - YouTube
    I am glad you were able to answer your own question! Your link with its amazing simulation is way beyond anything I imagined.

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  • Randy
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    Originally posted by lakeside53 View Post
    Why does it need to orbit the L2 point? [/URL]
    Quick answer at 11:58 of this video.

    https://youtu.be/fqHJ05IO-cA?t=717

    Last edited by Randy; 01-25-2022, 05:35 AM.

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  • lakeside53
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    Why does it need to orbit the L2 point? What (forces) is it orbiting? Can't it "just" orbit the sun synchronously with Earth?


    So.. Goggle is my friend... this is worth watching What Makes Lagrange Points Special Locations In Space - YouTube
    Last edited by lakeside53; 01-25-2022, 01:43 AM.

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  • aostling
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    Webb is now in its "halo orbit" around the L2 point.

    https://webb.nasa.gov/content/webbLa...ereIsWebb.html

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  • macona
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    Yeah, seeing what he has done really reminds me I need to get my scope out and test the mount I made.

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  • aostling
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    That is quite amazing. The screen resolution on my 16" MacBook Pro is 3072 x 1920, and the JWST in the final frames occupies one moving pixel. I wondered what sort of telescope was used, and found this in the comments.
    .
    The photos were shot with a $1,799 Celestron RASA 8 telescope, a $999 ZWO ASI183MM Pro monochrome camera, a $2,268 iOptron CEM40 equatorial mount, and an Astronomik H-alpha 12nm filter

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  • macona
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    Video of a guy catching it on his telescope:

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  • darryl
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    Months now for it to cool down-

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  • macona
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    It’s not that bad. At the red to NIR end of the spectrum it should have considerably better resolution than the Hubble. It’s only when you get to MWIR and LWIR that you start losing resolution.

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  • aostling
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    The video is instructive, especially in its discussion of the simple equation equating angular resolution to λ/D. This explains why despite the larger aperture the Webb images may not be as sharp as those obtained in the visible wavelengths. It tempers my expectation of what we should soon be seeing.

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  • macona
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    Huygens Optics did a short video on telescope resolution vs wavelength and diameter and talks about the Webb:

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