Aqua-Blue orb moving north,northeast in the Hudson Valley Mid May 1974 at high rate of speed

Descpription: Aqua-blue, round, no tail, speed and altitude undetermined.  All that I saw was this object moving North by Northeast at a rapid rate of speed.  I had only been discharged from the USAF a year earlier, I have a very extensive understanding of aircraft, sight, sound, air to ground speed determination.  There was no tail, so I ruled out, afterburners, meteors, or any thing I had ever seen in the night sky before.
 The color was beautiful, the object I saw as I was driving north on Rt. 9W passing through Esopus. I saw the object out my left window, it was visible for less than 5 seconds before it was out of sight, it could have been 10 miles up or 100 miles up, I had no frame of reference I could use to judge.
 To this day I do not know what it was, so to me it was my experience of seeing an Unidentied Object in the air.