Quicheng,
I'm crudely estimating from the posted uncertainties that the 3¦Ò uncertainty ellipse is somewhere around 20 arcmin across, which is rather large for JWST whose largest camera only covers a pair of 2.2x2.2 arcmin fields.
The full ellipse still about fits within a single Roman field, and that telescope should be about as sensitive as Hubble = only ~1-2 mag less sensitive than JWST for the same exposure time (which should make actually Roman faster at searching the full field to the same depth). However, given that solar system science is an extremely low priority for that telescope, I doubt a dedicated search program that goes sufficiently deep for a realistic chance of detection (likely taking a few days) would ever be approved. I think the best chance here would be to find a team with a non-solar system science case to do a deep observation of a field that fits the characteristics of the comet search field, and ask them to target that search field for their program.
thank you very much for the technical background! Yes, that's a rather small FOV for the JWST.
I guess I should work to get an executive order once the NGRST has seen first light... 8-)
Maik
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"One cannot discover comets lying in bed." * Lewis Swift
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