Purple Sky Orb Floats Mysteriously

Photo date: May 16, 2016. Photographer: Mark Mahin.

The photo below shows a purple orb above a building in New York City.

On the same night I photographed the darker orb below, which was much bigger. The orb was ten percent of the original photo height.

There was no fog, mist, rain or precipitation on this night. The air quality listed on airnow.gov was "good."