Hi Scott,

this is a really interesting project!

I observed the Orion trapezium yesterday at 800 meters altitude, using my 25" f4 Dobson. Fst was around 5,5 mag.
At 500x proplyd 159 was easy to see. Proplyd 170 was more difficult as it showed up only intermittently, but clearly recognizable. I could not see the G star however.

Greetings
Johannes