Orange Orb flies over Springfield.

I was sitting in bed watching tv. I looked out my window and noticed a slow moving orange light flying west.  I was facing south. I watched for a minute just wondering what it was, then it got brighter.  As it brightened, it split into two other glowing lights.  I am not sjre the distance from me to the orb, but the two other lights that aplit from the first fell back, one flew lower, as the other went higher.  They drifted a good distance away from the first and then got up to the same speed as the first.  They flew like this for about a minute and the the first light got brignter again, and the other two lights increased speed and went back into the first light.  
At this point I opened my windows and tried to listen for sounds.  The object was silent, but when I opened my window my dog stood up on the bed and growled for a second, the fur on her back stood up.  She ran for the door.  
The light then increased speed and just took off out of view. The whole event lasted around five minutes.