Trapezium Stars In The Great Orion Nebula
Observer’s Challenge complete report:
https://rogerivester.files.wordpress.com/2012/08/february-2012-observers-challenge-theta-orionis.pdf
Theta 1 “The Trapezium”
March 1977: 4 1/4-inch f/10 spherical mirror, Edmund Scientific reflector @ 80x – Beautiful view of all four primary stars. I could never see the E star with this scope.
February 1993: 10-inch f/4.5 reflector (using 4-inch off-axis stop-down mask) @ 254x – Seeing fair to good. Could see the “E” star, but not easy.
12-22-95: 80-mm f/15 refractor – All four stars appear as a beautiful white.
12-23-95: 10-inch f/4.5 reflector @ 120x – Conditions and seeing not good. Could see only the four primary stars.
March 1997: 3.5-inch Maksutov @ 135x – Seeing good, could see four stars. On one occasion, I thought that I could see the “E” star, but very difficult, using averted vision.
12-26-99: 10-inch f/4.5 reflector @ 142x – Fair to good. All six stars visible, E and F fairly easy.
12-26-99: 4-inch apochromatic f/7 refractor @190x – Must look carefully to see the “E” star, which appears red.
12-26-99: 4-inch achromatic f/9.8 refractor @ 224x – Can see fleeting glimpse of “E” star, but not constant.
January 2012: 76-mm Celestron FirstScope; Model 21024 Dobsonian @ 50x – All four stars visible…nice crisp view.
January 2012: 100-mm Orion SkyScanner @ 67x – All four stars visible, excellent view…slightly brighter than the 76-mm
02-24-2012: 4-inch f/9.8 refractor @ medium to high power. Seeing fair to poor, could not see E nor F.
02-25-2012: 10-inch f/4.5 reflector @ medium to high power. Seeing only fair with tube currents, no E or F stars.
Roger Ivester
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