While driving on hwy from east of Santa Fe to Albuquerque I observed large bright white triangular object high in sky for over 2 hours.

Late in the afternoon in end May 1990 I was driving on state highway #25 from Denver to Albuquerque when about an hour east of Santa Fe I noticed a triangular shaped, bright white object high in the sky out my driver's door window; the object would have been southeast of Santa Fe.
 My first thoughts were that the object must be a type of weather balloon as it was so high and bright and apparently very large (although I had never observed a weather balloon before).  However, a bit later, when the highway goes through a low mountain range with many turns, I noticed that this object maintained its position practically from whichever angle I was looking from, meaning that it must have been very high, many miles high, and therefore be enormous.
 Over 2 hours after the first sighting it was becoming dusk and I was approaching Albuquerque and as soon as I arrived home I got the binoculars but I could not see it any longer.
 The next day or so I was at a Memorial Day gathering of friends and many of us were discussing this object..  there were at least a half dozen who saw it exactly as I had.