Craft 1 mile in the air bright neon green moved at lightning speed top was shaped like an egg but had a flat base

My daughter, son in law and myself were sitting outside and we saw a glowing green neon light top half looked like an egg and the bottom half was flat hovering for about 45 seconds. It moved to the left at lightning speed about a half a mile in less than a second and then stopped and hovered again for about 30 seconds. It then dropped in mid air about 150 feet for 10 seconds and then jumped back up 150 feet to its original spot. It hovered again for less than a minute and took off at lightening speed back to the right where I originally saw it. I pulled my camera out and it disappeared. There was no lights blinking and there was no sound.