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Venus Image 2012/05/22(UT)
柚木健吉
Fumega Camilo Ucha,David Arditti,Peter Edwards
K.Yunoki,Camilo,D.Arditti,P.Edwards
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Kenkichi.Yunoki (260mm Newtonian) |
[Kenkichi Yunoki (Sakai City Japan)]
≪大阪府 堺市 柚木健吉≫
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Fumega Camilo Ucha(310mm.Newton) |
My fest image of the night side on Venus.
[Fumega Camilo Ucha : Galicia,Spain]
Here I have copied the technique of various other observers in imaging in the night side of Venus by massively over-exposing the thin crescent using an IR longpass filter when Venus is low in a twilight sky. The filter is an Asahi filter which passes wavelengths above 990nm. It therefore gives an exposure sensitive to the window in Venus's atmosphere at 1000nm that transmits the night time thermal glow from the surface.
Unfortunately nothing can be deduced from this image because Venus was passing behind a hedge and a tree as seen from my observatory at the time,so multiple diffraction effects are present. The spots are due to hot pixels (no dark frame was applied). The obstruction situation is unlikely to improve during this elongation. But I have at least established that the thermal glow can be detected with my equipment.
[David Arditti: Edgware Middlesex HA8 5LW: United Kingdom]
Not much to say except it was very beautiful through the eyepiece, very low down and boiling in the evening heat.
Some wierd crocodile skin effects when I tried to wavelet sharpen too much, just visable in this image as a slight darkening near the limb.
[Peter Edwars: West Sussex United Kingdom]
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