Between Gaia and WISE and the various IR surveys (WISE), we probably do have stars within 10 parsec covered now and particularly red dwarfs and brighter. Perhaps the dimmer or cooler brown dwarfs at the longer side of 10 pc might still be in question. The problem with Gaia is it can’t handle things brighter than about magnitude +5.7 very well and +2 or so at all. Alpha Centauri doesn’t appear in Gaia DR2, for example, though Proxima Centauri does. The other part of the problem is that stars themselves move pretty far in 200,000 years.

With Gaia additionally sorting out the false positives from real stars (which is at something like a 4:1 ratio from what I’ve seen so far, when dealing with objects in the plane of the galaxy or in the direction of the galactic center), and in addition much of Gaia DR2 is lacking high quality proper motion and radial velocity solutions, but I would be surprised if there was or had been something on the ingress route in the past million years.

On Nov 6, 2018, at 7:26 PM, Tim <xxxxxx@little-possums.net> wrote:

The lower bound comes from estimates of the number of stars that we
have not yet charted. There are almost certainly stars within
10 parsecs that we have not yet detected (likely dim red dwarf stars).
If Oumuamua came from such a star, then it could possibly have
travelled in interstellar space for as short a time as 200 000 years.