Images taken with 5inch or 6inch APO refractor or 12inch CDK or 13inch Newtonian
Recording with DMK41 or ASI120MC / ASI174 with FireCapture. Processing in AstroStakkert!3, Registax 6 and Photoshop CS2.
2020-01-23 01:24UT & 01:30UT. The first observation of 2020 is also introducing a new imaging filter. The image on the left is the first experiment with an Optolong Venus-UV filter (passing UV-A light 320nm-400nm). Using the 12inch CDK and TeleVue 2.5x barlow the system transmission in UV is heavily reduced via glass absorption. Exposure 33ms and gain 400 make for a quite noisy image. There is also a ghost reflection and it's origin still has to be investigated. But there is a hint of the clouds structure on Venus! On the right a comparison in visible light. This one had exposure 2.3ms and gain 100. But besides the phase it shows no other features.
Copyright images and processing Gert Gottschalk.
Copyright Bilder und Verarbeitung Gert Gottschalk
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