I am amazed that Kirk is working this week, what with the GMU Patriots
knocking on fame's door.
My febrile imagination doesn't come up with many community use cases for
astrometry, particularly those that can't be answered by a cone search.
a) Asteroid pre-covery: Here the problem isn't the astrometry, but
trying to predict the position when the object was in LSST's field
of view. This is an example of a metadata use case (if such a
concept even exists).
b) Perturbations: My guess is that the client that looks for astrometric
wiggles in all stars won't have the sophistication to do a search
of the possible orbits that would explain the wiggle. My guess is
that the client might pull out the period and amplitude of the
biggest Fourier term, and leave the rest of the analysis to
specific requests. For example, the general community might often
ask for "give me all objects with astrometric periods between 100
and 1000 days and a g-i color greater than 4".
c) Diseases: The default processing will fail for various combinations
of duplicity, motion, variability, etc., and it would be reasonable
for humans to try to figure out what is going on. Such a query
might be "give me all objects whose astrometric sigma is 5 times
larger than the median sigma of all objects with a similar number
of observations".
I am sure that there are more. I should note that I am really trying
to get (a) off the ground using the USNO's pixel archive from the ensemble
of Schmidt surveys. This is work with Suzanne Jacoby and Carol Christian,
and I think that something might actually happen in the next couple of
months, or at least might with suitable interest.
-Dave
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