金星 ALPO-Japan Latest

Venus Image 2022/05/13(UT)

Antonio Cidadao,Clyde Foster
A.Cidadao,C.Foster

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I attach the Venus images obtained this morning, after sunrise, with above average seeing. Five distinct IR filters were used, namely:
Sloan z'-s' (820nm-920nm)
Sloan Y' (940nm-1040nm)
IR850 (>850nm)
VW-1 (1000nm/20nm)
CH4 (890nm/20nm)
Two images, obtained about 1h apart, both using the z'-s' filter were used to produce a gif animation showing retrograde atmospheric rotation.
Since seeing was a bit better today, I employed a milder processing, but on the animation I used both the mild and the usual hard processing.
Higher cloud contrast is observed with Sloan z'-s' (820nm-920nm) and IR850 (>850nm) filters, VW-1 (1000nm/20nm) and CH4 (890nm/20nm) producing, as expected (only 20nm pass-band) the lowest S/N ratio.
No "vertical" linear cloud patterns today...



≪アントニオ  シダダオ  ポルトガル≫
[Antonio Cidadao  Oeiras - Portugal]

IR/UV set from yesterday morning. There was some jet stream and also cloud interference as the sun was rising. 
The UV in particular was negatively affected.

[Clyde Foster:Centurion,South Africa]

ALPO-Japan Latest Venus Section	2022/05/14
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