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Actually, the Grace satellites are several hundred kilometers apart and would not appear very close together in the sky, at least not close enough to be confused as a single object. I'm also not sure how bright they are, but I am guessing that they likely can be seen. All things considered, they likely appear as two separate points of light with one following the other at a significant distance (I'm guessing no less than about 20 degrees, depending on height and their actual separation).