UFO tonight!

[Hotinhawaii2]

Any idea who launched this one?

Years ago I watched a silver weather(?) balloon released near the old control tower at Hilo airport.  It was approximately 4-6 feet across(?). They were inside the fence so I assume state or federal officials.  Sorry I can't be more specific, but it was awhile ago.  Perhaps you can call an airport administrative office and ask if they know of an agency that might launch a balloon from there?

(Be careful looking into a telescope aimed near the sun before it sets.  It would only take a moment to burn your retina)

This one was gigantic! I think it must have been the $2 million kind. I have read that many companies have launched them to get very high res images of the earth. I could tell it was nothing like a 4-6 foot balloon. I could clearly see the ridges on the sides and I could see it billowing in the wind. 
As for the UFO title, I'm sticking with it. It was a UFO for an hour for me and many others saw it and no one could identify it. It appeared round and stationary to the naked eye.