Venus in UV under the best of seeing conditions (Niall MacNeill)

Contains: Solar system body or event

Venus in UV under the best of seeing conditions

Acquisition type: Lucky imaging

Sometimes you just get lucky with the seeing and last evening, it was extraordinarily good for Venus and Mercury in the evening sky. In fact I was able to image image Venus for an hour, where I normally only get a good 15 minute window if it is good at all.
The much higher sensitivity to UV of the ZWO ASI 178MM camera and the improved image scale versus the ZWO ASI 174MM, I used previously, has paid dividends under these seeing conditions. Once again the cloud patterns display the classic chevron shape.
The single image is an integration of the 3 best sequential captures and has easily the best resolution I've ever achieved imaging Venus in UV.
Since the conditions held up so well I decided to make an animation over the duration of the captures. I made 17 x 3 minute captures (13ms exposure 75fps) and integrated them in lots of 4 with WinJUPOS...and 5 for the last part when the seeing was deteriorating. This restricted the integration time to 12-15 mins and limited the loss of definition due to the movement of the cloud patterns.
The animation of the 4 images thus produced shows clearly how rapidly the cloud patterns on Venus move in just the 48 mins duration. I measured the movement with Photoshop at ~2.0% of the planet's diameter. So that is 0.02 x 12,100 = 242km in 48 mins, or 303 km/hr. This compares well with the literature value of 300 km/hr.
The animation is shown in Revision B and can be accessed via the mouse over.

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Description: Animation of Venus over 48 mins

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Venus in UV under the best of seeing conditions

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