Black triangle over Katy Texas in mid 1980s

In summer of 1985 or 86 my teenaged son and I noticed a white light in the sky about a mile away from our house  that was blinking slowly, but motionless in the dusk sky.  My husband looked but thought it must be a plane, so my son and I got in the car and drove to get near it and saw it was hovering very low in the sky perfectly still, noiseless.  We could see it was a black perfect triangle, and had a white blinking light underneath at each corner blinking in unison.  
Many others on a school parking lot nearby were also watching it.  A jogger said he had ran the block 3 times and it had not moved.  My son and i rushed home to get my husband and our 8 inch reflector telescope to view it better.  When we came back the sky was dark, but the thing was still stationary, hanging there.
We were almost directly underneath it, and set up the scope on the field grass.  The instant I got my eye on the viewer the lights all went off on it, just like someone flipped the switch off.  It was very eerie,  but after our eyes adjusted to the darkness in the viewfinder we could see the color seemed to be flat black or dark flat gunmetal gray.  It also seemed to not be featureless on the bottom but to have an undulating or webbed appearance. 
After awhile, the telescope began to reveal that it was very softly glowing orange, like coals that are almost burned out.  (You could not see it at all naked eye against the dark sky)   
We all watched it hang there over us for most of an hour and it never budged.   Mosquitoes were biting and it was hot, so we finally left it there suspended in the dark.
Witness indicates that the date is approximate.  PD