Orb over central Wisconsin

While sunbathing I observed an orb like object traveling at an incredible rate of speed in the sky above.  It had a dark - metallic look to it, and appeared to be extremely high in the atmosphere.  It moved in a perfect straight line across the sky, when it was towards the middle of the horizon, it looped around and made a small , perfect, circular  motion and then continued on its normal flight path.
For the elevation it was at, it had to have been far faster than any aircraft, however, it wasn't so fast that it was a blur.  It cleared the entire horizon in about 60-90 seconds.  There was no blinking or flashing, no sounds, and no exhaust.  The sky was perfectly clear so I could observe it very well.  Also, although it was circular, when it was directly above my view, I notice it did have slightly contoured edges.  Kind of like a more compact, and curved boomerang, however, the "wings" or triangualr shape was very subtle and could only be observed when it was directly overhead.