Close up glowing hovering white orb photographed green in two subsequent locations in Wasatch Mountains

I was driving southbound on Utah state road 65 from the East Canyon Reservoir area (Wasatch mountains) toward Salt Lake City/Interstate 80 enjoying the autumn leaves on Oct. 8th, 2013 approximately 430-5pm MST.  Relatively few cars were on the winding mountain road and the sky was very overcast.  While driving on a fairly straight portion of the road, a glowing white light caught my eye.  The spherical object was approximately the size of a cantaloupe or basketball and was hovering stationary near the top of a large tree.  The object seemed to shimmer white light yet did not blink lights and did not change light color.  It was a glowing ball of white transparent light.
I quickly braked and grabbed my iphone (which was in camera mode as I had been stopping periodically to take pictures of the autumn leaves) and snapped a picture of the glowing orb.  Mere seconds later, the orb appeared on the opposite side of the 2-lane road at approximately the same height off the ground, yet I did not witness the orb move from one location to the other. It was simply as if it "disappeared" as it moved between locations within seconds. I quickly snapped a second picture before the object simply was no longer visible. 
No longer seeing the object, I proceeding in driving toward my destination. Once in SLC, I stopped to look at the two pictures of the object I had taken.  I was surprised to see that the object (which had appeared bright white to my eyes at the time I observed and photographed the object) appeared glowing GREEN, not white, in the two photographs! 
The lighted object I witnessed and photographed was not a reflection from another vehicle or street sign, nor was it a malfunction of my iphone camera (inasmuch as I have taken literally hundreds of photos of this season's autumn leaves on the iphone at varying times of the day and early evening and have never seen a reflective green spherical object inadvertently appear in any of them)!   The green orbs shown in the attached photographs are what ap! peared to the naked eye as white glowing orbs. 
I do not know what it was I witnessed and photographed; I do however know I successfully captured whatever it was in two valid photos.