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Venus nightside at 1000nm 6th May 2020

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About this observation
Observer
Martin Lewis
Time of observation
05/05/2020 - 19:47
Object
Venus
Observing location
St Albans, UK
Equipment
444mm Dobsonian
ASI174MM
Edmunds 1000nm filter 25nm bandwidth
Exposure
200msec 18.9mins accumulated exposure
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Unexpectedly good conditions last night just as the skies started to darken, for 1000nm imaging of the night side of Venus- the atmosphere being transparent at these wavelength allowing a view of the hot surface of the planet.

This is a Winjupos combination of 18.9mins accumulated exposure with 1000nm Edmunds filter (25nm bandwidth) with an increase to 200msec exposures following very helpful advice and discussions with Anthony Wesley and Phil Miles. All at prime focus on my f4.4, 444mm Dobsonian

A number of dark patches can be seen on the night side of Venus which can day to day be seen rotating slowly with the planet and so are confirmed as real features- most likely higher elevation features which are subsequently cooler.

Martin

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