Large Object hovering at low altitude in sky in Lincoln Nebraska

This episode has bothered me for years.  I just found this site and decided to relay information on what I saw this evening.  
Over the years, I have forgotten the exact date, but it's as close as I remember it.  
My dad was diagnosed with cancer just a couple of days before this and was a patient at what was then St. Elizabeth's Hospital (I believe on South 70th St.).   My husband and I lived in South Lincoln South of Old Cheney Road between 27th & 40th St.
 As we were driving home from the hospital we saw what looked like a monstrous round spaceship.  I actually feel silly putting this into writing, as most everyone I know would write me off a kook.  
We spotted it about 5,000 - 8,000 feet up in the air over South Lincoln near 48th St.  It was in the air long enough for us to come home and watch it literally "hover" in the air without a single sound (other than a dull hum) from the time we spotted it at approx 48th & O St. to our home.  
My husband and I were literally frozen.  We don't remember hearing each other talk, although I know I was speaking.  
The next day we asked people at work and found just one person who witnessed the same object hovering in the air that night before.  The best way to describe this object was that it was very similar in size & shape as the "Mother Ship" in "Close Encounters."  
I would swear under oath about this experience.