wide field astrophotography
Comet NEOWISE (C/2020 F3) seen here was photographed over Georgian Bay as it passes through the constellation Ursa Major. Having only recently been discovered (March 27, 2020) by astronomers working on the Wide-field Infrared Survey Explorer (WISE) space telescope, it is a welcome surprise in the night sky.  Neowise is the brightest comet seen in the northern hemisphere since Hale–Bopp in 1997. Neowise originates in the outer reaches of our solar system and won't be seen again from Earth for another 6,800 years.  It is expected to make its closest pass to Earth (64 million miles) on July 22/23, 2020.  (Note: The bright star almost directly above the comets nucleus is Talitha in the constellation Ursa Major.)
C/2020 F3 • Comet NEOWISE © Irwin Seidman

 Nikon D750 | Sigma 70-200mm @ 165mm | 6 min exposure | 2020-07-17

Comets are made up of ice, rock and dust. As their orbit brings them closer to the sun, they heat up and often stream two tails.  The brighter whitish tail is made up of dust and gas, and the somewhat dimmer bluish tail is made of electrically-charged gas molecules, or ions.  An eerie greenish glow (diatomic carbon) is sometimes also visible around the comet’s coma.
C/2020 F3  Comet NEOWISE (annotated) © Irwin Seidman

Astrometric annotations for above image courtesy of Astrometry.net

Comet Neowise (C/2020 F3) passing under the Big Dipper in the constellation Ursa Major.  This image was captured from the shores of Georgian Bay near Owen Sound, Ontario, Canada
C/2020 F3 • Comet NEOWISE © Irwin Seidman

 Nikon D750 | Sigma 24-70mm @ 24mm  | 30sec exposure | 2020-07-17

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