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The apparent size of this object, considered to be too large to be the target marker, is only a very simple illusion: the thing seems posed on the asteroid, but it is only an effect of perspective; the probe in fact is just sent towards the asteroid, it is still close to the Hayabusa probe and not posed on the asteroid. On the following images, it naturally apparently "disappeared" since it is indeed too small to be spotted on the asteroid from this distance. Hayabusa carried three of these small spheres, which are in fact simply inert reflective objects - hence the white aspect - with three fixation points, on which the probe can shoot a beam to obtain by telemetry its exact distance to the surface of the asteroid, for a correct automatic approach of its surface.