Seeing an object close to the Atlanta Airport

I was between 5 and 8 years old.  We lived in College Park, Ga. Only a few miles from the Atlanta Airport.  We lived in a subdivison and in the corner house.  Their was a house next door to us and then a wooded lot and then the rows of houses picked up again.  There were homes across the street from us.  
I had been playing with my friends that lived 3 doors down from us and had to go home to use the bathroom.  Upon returning, as I reached the corner of the wooded lot a circled craft came over making not a sound and just at the tips of the trees.  
I stood frozen watching it go over and and could not speek a word to ask the other kids do they see this.  I looked at them and they were playing not even seeing this. 
It was small,  about 8 to 10 feet around and had what I would call today as chaser lights of different colors flashing around the whole paremature of the craft.  I watched it as it crossed the homes and just as it was out of sight I was finely able to yell to the other kids if they saw it.  Of course they said no.  
I ran home to tell my mother and she said that it was a weather balloon.  I know it was not.  It was almost flat and circuler with the chaser lights running around it.  It moved about, I would guess 5 mph. Very slow and quiet.  
The trees did not sway a bit and it was almost touching the tree tops. 
It was a silver color and looked like it had a darker circle in the middle of the bottom of the circle.  Like I said we only lived a few miles from the Atlanta Airport.  
I will never forget this.
Date is approximate.  PD