Orion Nebula Trapezium

Wednesday 12th December 2017
8.30 to 10pm Moon just past first quarter
A while ago at the club, someone suggested I try and see all six stars in the trapezium with my 16 inch Dobsonian.  Last night was really clear and I managed to see all six. I had a vague recollection I’d managed this before, but have only been able to see the four brighter stars the last few times I’ve tried. It must be something to do with seeing conditions/transparency.
All six stars were visible in my Vixen LVW 13mm eyepiece, which provides 155x magnification in my scope. The fainter two stars weren’t visible in my 8mm Televue Radian eyepiece, but I recall seeing them in an old Televue plossl eyepiece I used to own.
Comparing the two faint stars, the bottom one is slightly more inclined towards its neighbour, whereas the top one is pointing out more to open space. The bottom one is easier to see, but both stars were coming in and out of view, depending on atmospheric conditions.

David Geary

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