This is both a very obvious and a very interesting proposal: locate an apparent source of gravitation by observing the gravitational effects it has upon a fleet of small (almost point-like) craft.
However, there’s something that niggles me.
If it’s a primordial black hole that has been captured by the sun, why is it (as far as I understand) apparently in the same plane (ecliptic) as all the other major bodies in the solar system? It makes sense for all planets & cetera to be in the same plane because they all originated in the same swirling (flat) planetary nebula... but a captured object could potentially orbit at any inclination (and, considering how massive it is, I doubt it would be coerced into being coplanar by comparatively minor intersections with light bodies such as those present in the Oort Cloud, which are arranged roughly spherically anyway).
However, there’s something that niggles me.
If it’s a primordial black hole that has been captured by the sun, why is it (as far as I understand) apparently in the same plane (ecliptic) as all the other major bodies in the solar system? It makes sense for all planets & cetera to be in the same plane because they all originated in the same swirling (flat) planetary nebula... but a captured object could potentially orbit at any inclination (and, considering how massive it is, I doubt it would be coerced into being coplanar by comparatively minor intersections with light bodies such as those present in the Oort Cloud, which are arranged roughly spherically anyway).