# How well have we mapped our local neighborhood of stars?

Do we have a reasonable idea of how well we've mapped our local neighborhood of stars? That is, about what fraction we know about vs. what fraction are unseen (too dim, too much dust, not enough observing time, etc.).

Something like, "We're almost certain to have found all stars out to __ pc, we expect to have found > 90% [or whatever percentage is convenient] out to __ pc, we think we've found only -% in the Milky Way" would be perfect, especially with a reference. If I could have just one distance my current interest is ~2000 pc but I'll take whatever can be found. (Clearly we have at least fair coverage of ~60 pc to map the Local Bubble.)

• Sep 7 at 14:46

One way for you to find out would be to look at lists of stars within varius distance limits of Earth.

For example Wikipedia has:

https://en.wikipedia.org/wiki/List_of_nearest_stars_and_brown_dwarfs

That lists all the stars and brown dwarfs out to a distance of 5.0 parsecs or 16.3 light years from earth.

Counting by star systems and not by individual stars, there are 7, counting the solar system out to about 2.5 parsecs or 8.15 light years. A sphere with a radius of 5 parsecs would have 8 times the volume, so there should be about 8times as many star ssytems, or about 56, out to 5 parsecs.

I counted 56 star systems out to about 5 parsecs. So the percentage of stars whhich have been discovered does not seem to diminish with distanc eover that samll distance.

So you should search for lists of stars within various distances of the Sun. And you should calculate the relative volumes of the distances in the various lists. And then count the numbers of stars within each volume to see how they compare to the relative volumes of space.

Finding lists that number the stars would be very convenient for you.

And I suppose that some such lists may discuss how complete they are.