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Venus: 25th May and some experiments


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About this observation
Paul G. Abel
Time of observation
26/05/2020 - 12:56
305mm Newtonian
x67 and x100
Filters: W15, W21, W25A and W47
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Drawing of Venus made on 25th May using the W21 orange filter.  In recent days I have spotted some illusory cusp extensions which seem to arrive when viewing the planet with powers greater than x100 in poor seeing- the cusps don't come to fine focus in these conditions and can in a light sky make it appear as if extensions are present.  

After experimenting with filters I found that the W21 orange filter helped to reduce the effect and that powers of x60 or so were adequate enough to see the thin crescent.  I will write a little more about this in the next issue of Messenger which will be released in the next week or so. 

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