Tuesday, August 23, 2016

A Big Purple Orb in the Sky

Photo date: August 22, 2016. Photographer: Mark Mahin.

The photo below shows a large purple orb I photographed above a building in New York City. The orb had a size that was one tenth of the original photo height. In order for a dust particle to appear this large, it would have to have a size of about 1500 microns (1.5 millimeters), which is about 1500 times larger than the actual size of outdoor airborne dust particles (about 1 micron).  The moon was not visible when the photo was taken.

big purple orb

There was no rain, fog, mist or precipitation on this night. The air quality listed on airnow.gov was "good," with a rating of 30.

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