UFO sighting one summer night back in the late 1980's.

Years back one summer night.  My sister was lying down in the living room couch looking outside at the stars.  My Mom & I were at the house.  
All of a sudden my sister yelled out for us.  She was yelling, “Look, look, what is that up there?”  My sister, Mom and Me looked out the window and there was an oval shape flying saucer with different colors around it standing still on top of a mountain near our home.  It appeared it was looking down at the water tower in Turnbull Canyons Hills, Hacienda Heights, CA.  
I ran to call my neighbors so they can come and see it.  By the time they came out my sister said the UFO disappeared rapidly.  Turnbull Canyons Hills in Hacienda Heights, CA, in the U.S.A. is popular for supernatural stuff.  
I will never forget what I saw but it was brief.
Date indicated by source of report is illogical.  We have assigned an arbitrary date above.  PD