Comet 21P/Giacobini-Zinner
Taken by Dr Paolo Candy on August 17, 2018 @ Ci.A.O. Cimini Astronomical Observatory - Italy
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A genuine snapshot ... at this fine comet.
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Nice close-up!

Posted by owleye1 2018-08-18 13:10:48
Dr Candy, leading edge is green, trailing plasma is red? Can you explain please, regards Mark
Posted by markbuxton 2018-08-18 13:23:58
The coma is green for ionized gas, while the tail of dust is so rich and flowing that it overhangs and submerges the thin tail of ions. The dust tail reflects sunlight.
Posted by astromazzo 2018-08-18 17:07:00
Thanks you! regards, Mark
Posted by markbuxton 2018-08-19 02:55:56
webmaster prefer a photo-postcard (not genuine) to close-up ... why?
Posted by astromazzo 2018-08-20 01:46:49
Dr Candy, your image is valuable because it is a more natural/ less processed image. I appreciate this may not be as attractive to some. I was wondering if the coma might also contain ionized atomic oxygen in some parts (red) and molecular oxygen (green) in others? like in aurora on Earth.
regards Mark
Posted by markbuxton 2018-08-25 11:18:15
26 thumbs up
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