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BAA Observing Sections Mercury and Venus

Mercury 22nd Sept 2017

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About this observation
Observer
Martin Lewis
Time of observation
22/09/2017 - 10:15
Object
Mercury
Observing location
St Albans
Equipment
222mm Dobsonian
742nm IR filter
ASi174MM
Tags

Finally, after 4 attempts, an image of Mercury in IR showing some surface detail. Problem in the past has always been finding the actual planet during the daytime with a Dobsonian scope. In this attempt I used my Argo Navis digital setting circles and set up vertically and S and then went to the alt and az as predicted by Sky Safari. There it was in a low power eyepiece shining at mag -1.1. Its brightness, even at f36, and in the IR allowed 2msec exposure and a massive number of frames to be recorded. The final image is made up of the best 0.5% of 165k frames stacked in Autostakkert.

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