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Thanks Julian. I tend to agree with your logic on the estimate of its visual magnitude at L2. Which means it will be easy to image it with my C14 and CCD camera which can easily reach 19V.
It appears from the website you quoted that its orbit around L2 is the size of the moon's orbit so I figure that the 6 month excursion in the sky will by a whopping 30 degrees across centered on the actual L2 co-ordinates in the sky.
I do a lot of astrometry for the MPC so I can hardly wait for the sky to clear in Sydney to take some images. The JWST is now about 500,000km from Earth.
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