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Venus Image 2022/04/20(UT)
Clyde Foster,Paul G. Abel,Antonio Cidadao,Carsten Bauer,Detlev Niechoy
C.Foster,P.Abel,A.Cidadao,C.Bauer,D.Niechoy
I gave Venus a try just after sunrise,and was rewarded with some interesting UV cloud formations.
One of the rather uninformed perceptions that has kept me away from Venus was the thought
that there wasn't much to see,or daily changes that can be observed.
Well that perception has been well and truly put to bed!
Having relooked closely at the Venus images I circulated this morning,
I suspect that there may be some artefacts (mainly near the terminator) that have arisen from the strong sharpening,
levels and contrast adjustment.
I suspect some slight contamination on the chip/chip window,which would be enhanced and highlighted by the processing,
but I will look into this.
I do believe there is interesting cloud structure,but based on the above,please treat these latest results with caution.
I still feeling my way forward with Venus processing!
(2022/06/09)
I greatly appreciate Manos Kardasis informing me that he was concerned about possible artefacts in my UV images of 20 April 2022,
likely due to me still using multiple alignment boxes at the time (I致e subsequently learned that this is not a good idea with Venus).
I have reworked the data using a single alignment box around the planet,and hopefully this is now a better representation.
Kindly delete the original image set and replace with this reworked version.
Once again,my thanks to Manos for his critical,but constructive,and important input!
[Clyde Foster:Centurion,South Africa]
I observed Venus this morning- the sky was rather hazy and seeing only average at best.
Still,there seemed to be a dark marking on the disk to the south. Other points include:
-Bright Limb Band: Not really seen
-Terminator: Geometrically regular
-Cusp Caps: Southern cusp cap small but bright,northern cusp large but somewhat dull
-Cusp Collars: Southern cusp collar fairly dark.
[Paul G. Abel:Leicester:United Kingdom]
Dear sirs,I attach today's IR Venus images obtained with SLOAN/SDSS z'-s' and Y' Baader filters under average seeing and wind gusts.
Similar cloud markings are seen with both filters,but are more contrasted with the z'-s' filter.
A gif animation shows that cloud markings remain registered in different filtered images obtained about 6 min apart.
Images were obtained with a 14" LX200 SCT (f/10) and a PO Neptune C II camera.
≪アントニオ シダダオ ポルトガル≫
[Antonio Cidadao Oeiras - Portugal]
In contrast to the quiet mood of the awakening day,the air was very turbulent.
But some coarse detail is recognizable.
Once more there is a correspondance between the IR and G channel.
Also,in B the polar region brightness seems to increase again,
compared to the situation some weeks ago
[Carsten Bauer : Frankfurt,Germany]
[Detlev Niechoy : Goettingen,Germany]
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