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M20 Trifid Nebula
Finally Imaged M20 last night after an aborted attempt the previous night due to very poor seeing and heavy dew etc
75 x 2 minute dithered guided subs
20 x darks
6” f6 Bintel newt on a HEQ5 mount
Canon 600D with Baader coma corrector
PHD2 guiding ( 1.30 to 1.50 arc sec error )
EQMOD and Stellarium for Goto and tracking
BYEOS
Stacked in DSS
Processed in Startools
Finished at 1.30am this morning
I noticed my focus drifting towards the end of the session when my scope was pointed West about 20deg above my neighbours roof line.They leave their Air con running all night so I assume there is some residual heat rising from the house ( a big 2 storey brick home ) I noticed my focus was drifting off a bit on the last 10 subs. I assume it might be due to the heat rising off the house as M20 was still at around 45 deg when I finished. Maybe ? Who knows?
Thanks for looking, comments most welcome
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