金星 ALPO-Japan Latest

Venus Image 2022/06/09(UT)

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

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Dear sirs,today's Venus images were heavily disturbed due to the presence of considerable cloud coverage at the time seeing was better.
Afterwards,seeing degraded beyond the point imaging was of any use.
As the result of frequent SER pausing (in SharpCap) due to intervening clouds,
each one of the three independent images obtained today is the average of two 5min SERs obtained immediately after the other
(this was made to try to obtain the usual S/N ratio of "normal" imaging days).
The images to be averaged were perfectly registered but NOT derotated.
The feature I interpreted as the cloud discontinuity (arrowed on enhanced miniatures) is near the limb on the first two images,
and is too close to the limb on the third to allow unambiguous identification.
I wonder if this type of relative positioning has previously hindered its visualization while being present...
If the labeled feature is indeed the CD,it is thin but rather long,and curved
("f" curved,i.e. toward the terminator) mostly on the S hemisphere.
Other cloud boundaries are seen on the three images,with proper atmospheric rotation depicted in the animated gif.
The gif has two panels. At the right,frames are the first and last image,to show the total atmospheric rotation in the imaging session.
At the left,frames are the two first images,to allow the visualization of CD motion.
Obviously,atmospheric rotation is smaller on the left panel.
Hope that others have been able to image today to confirm,or not,the above description.
 
≪アントニオ  シダダオ  ポルトガル≫
[Antonio Cidadao  Oeiras - Portugal]

Unfortunately I had very poor conditions around sunrise for the early set of images,
with very low contrast on teh IR742 and overall the UV data was poor. 
The sets were separated by approx one and a half hours. Hopefully others had better luck.

[Clyde Foster:Centurion,South Africa]

ALPO-Japan Latest Venus Section	2022/06/10
	2022/06/08