correct_parallax fails for small r

[ColinOrionChandler]

This is an issue for reflex-correction in Region Search, fakes analysis, and probably reproject.
The problem distance cutoff could be higher, there just aren't any fakes between 2.1 au and 3.1 au and I haven't tried reflex-correcting to distances under 5 au yet (though I have in the past, and it failed then).
I don't think we can simply ignore these fakes because they will still show up in the image data.
Besides, this issue would also impact users trying to RS or reproject in this regime.
A possible fakes-only workaround would be to supply the known geocentric distances to the new version of correct_parallax, but I haven't tested this in any way yet.

[ColinOrionChandler]

r doesn't have to be that small. Here's an example with an object at r=5 au:

coord=(251.29497121, -22.30754899), obstime=2019-06-04 04:28:11.845853, heliocentric_distance=5.0

[ColinOrionChandler]

If we can incorporate the bounds (see #629 ) then I think this issue will be resolved.

[ColinOrionChandler]

This was fixed previously, but with the new vectorized approach this is again a problem. A new kludge could be to send the failed items to the old fitter?