Fireball Halo ~ Marco Mastria captured this fireball or bolide exploding over São Paulo, Brazil at 01:08:03 UTC on July 7, '14.

At right is the moon surrounded by a faint 22° halo. At left the fireball which at its brightest outshines the moon - it too has its 22° halo.

All images ©Marco Mastria, shown with permission
With enough crystals of the right size and quality in high cirrus all light sources produce halos.

A challenge would be to image one (other than a pillar, that has been done) from a star.
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