Suppose there is an object with the mass of the moon made entirely of dark matter. Suppose that somehow, it has the same mass density as the moon. By dark matter I mean matter that does not interact through the EM force, as well as the strong or weak force. Thus this object is bound entirely by the gravitational force.
Suppose this object is moving with an initial velocity, greater than the our solar system escape velocity. It's position is outside the solar system and its velocity vector direction is in the direction towards Earth.
At what point would the we be able to detect this object, with the equipment currently in operation on Earth? Is there a speed dependence on detection?
Would we be able to detect this object with gravitational wave detector?