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Venus Image 2017/07/31(UT)

Paul G. Abel,Simon Kidd

Paul G. Abel
Although there was a little patchy cloud,the sky was fairly transparent and I was able to see the planet quite clearly with the naked eye.
Seeing was rather poor but there were some interesting features on the disk:
Illuminated Disk: The theoretical phase was 74% but in IL it appeared much less at only 66%.
There was a faint dusky marking to the south,and a darker marker to the north,close to the equator.
Although this feature was present in the W#15,it was a little more subtle.
Bright Limb Band: Visible and complete.
Terminator: Geometrically regular.
Cusp Caps: Both present,perhaps the southern cusp was marginally brighter.
Cusp Collars: Both present- about equal.

[Paul G. Abel:Leicester:United Kingdom]

Simon Kidd
Venus yesterday morning, showing westward drift of cloud features.742nm IR pass filter used. 
(Using (very) basic measurements and maths, I calculated the speed of these winds at the equator as about 120m/s... a bit slow perhaps?)
Interesting swirling effect noticed in places.(C14, ZWO ASI224, 742nm filter)

[Simon Kidd: Welwyn Herts,United Kingdom]

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