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At 1.5 million km JWST will be roughly 4,000 times farther than the ISS when it's overhead, and very roughly a tenth of the cross-section. So if the ISS can be as bright as -4 magnitude, then JWST will be very roughly +16. That's well within the range of small observatories and large amateur telescopes. But there is going to be quite a lot of variability in ...

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