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Jupiter / Dew
Had the first really clear evening for quite a while, so got the scope out, had a good view of Venus, and the phase has noticeably changed since I last spent any time looking at it, which is cool.
A little later I span the scope round to have a look at Jupiter and I was just in time to watch Ganymede move clear of the limb, with it's shadow still over the planet, with Io transiting on the other side! I've only seen a moon transit once before so this blew me away! If only I could have photographed it....
The downside is I've just been forced in by dew on the mirror (either that or it suddenly got VERY dusty). BOM says temp is 7.9, apparent temp 5.8, dew point 5.7. There was dew on the tube almost as soon as I took it out. I had the fan running on the mirror, but it hasn't stopped the dew. We have cool evenings here in Mildura, so can anyone give me any good ideas on preventing this happening?
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