Comet C/2021 A2 NEOWISE CN 3883Å coma
Taken by Jorma Ryske on February 16, 2021 @
Finland, Helsinki
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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: 2021:02:21 11:43:23
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Details:
Comet C/2021 A2 (NEOWISE) cyanogen CN radical gas coma diameter 1,7'/50000km and wide fan-shaped CN gas tail length 3,5'/100000km towards PA 10° is visible in this 3870Å narrowband/150Å filter image. Comet distance from sun is 1,46au so the sun's heat and UV radiation is strong enough to sublimate comet icy surface and photodissociate gases like CN emitting at UV wavelength 3883Å.
Image 1) 30x180s=90min (2021-02-16 20:15-21:50UT) with CN 387nm narrowband filter.
Image 2) Processed cropped image 1 with CometCIEF to enhance coma and tail morphology.
Telescope 305/1200mm Newton, CCD QSI690, filter Semrock CN 387nm/15nm. FoV 25' x 20'. North up, east left. CometCIEF Samarasinha, N. H., Martin, M. P., Larson, S. M, 2013. Cometary Coma Image Enhancement Facility, http://www.psi.edu/research/cometimen.
Photographer's website:
https://www.taivaanvahti.fi/observations/show/96216
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