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HST images of Uranus and Neptune
titanicrivers
post Feb 14 2019, 09:16 PM
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Amazing new images from Hubble Space Telescope (HST) of Uranus and Neptune! https://earthsky.org/space/hubble-space-tel...-uranus-neptune
Here are the Hubble site images: http://hubblesite.org/images/news/release/2019-06
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titanicrivers
post Feb 18 2019, 08:45 PM
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From the OPAL site the images of Uranus are taken with the WF3-UVIS filter camera on Hubble and are not IR images. There are 63 UVIS(ultra violet-visual) filters http://www.stsci.edu/hst/wfc3/ins_performa...ponents/filters. My guess is that the images published were from the F845 filter which shows the N polar cap AND the compact methane ice cloud at the polar cap edge https://solarsystem.nasa.gov/news/839/hubbl...uranus-neptune/
As the compact cloud is considered an upper atmospheric phenomenon (sometimes visible in amateur telescopes) and the large polar cap is not a high troposphere or stratospheric phenomenon, that a visible light view of Uranus might still appear relatively bland! With the north polar cap of Uranus facing the sun however one wonders whether it might become visible as the planet’s summer progresses.
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JRehling
post Feb 18 2019, 09:41 PM
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The F845 filter is certainly what I'd call infrared, whatever bin they happened to organize it into. There may be no exact sharp cutoff of the longest wavelength a human eye can see, but I don't think anyone considers >800nm to be red as opposed to IR.
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titanicrivers
post Feb 18 2019, 10:41 PM
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QUOTE (JRehling @ Feb 18 2019, 03:41 PM) *
The F845 filter is certainly what I'd call infrared, whatever bin they happened to organize it into. There may be no exact sharp cutoff of the longest wavelength a human eye can see, but I don't think anyone considers >800nm to be red as opposed to IR.

Excellent point! Looking a bit further that filter spans the 8K to 9K bandwidth; might be better in the IR bin! Will have to look further as to exactly how that image was created. Does your colorized image in your figure above approximate what the human eye would see?
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