Quote:
Originally Posted by RyanW
I would assume ongoing minor planet searches (most importantly, Near Earth Object tracking) are distinctly a matter of Astronomy, probably also exoplanet searches and possibly studies of the large scale structure of the universe.
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Astrophysics in all cases. For example, NEO work involves combining infrared observations with optical work on object of poorly understood albedos (want you really want is the size, for obvious reasons). There is a lot of modeling of the asteroid composition and surface that goes into it.
On the other hand, it is worth noting that the intersection of physics and astrophysics is basically complete. The universe is really big, and contains lots of stuff, so pretty much any branch of physics has a related branch of astrophysics.