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Jim Curry
sage
Reged: 10/29/07
Posts: 432
Loc: Maine
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I was looking at TR 37 in the nebula ic 1396. I didn't see the nebulosity and tried my O3 filter on it as well. Is there a filter to bring out this particular type nebula? 
(The moon was above the horizon)
Jim
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Vixen 140 refractor
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Jim Curry
sage
Reged: 10/29/07
Posts: 432
Loc: Maine
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Never mind, I went to Dave's best of filter article.
Jim
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Vixen 140 refractor
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David Knisely
Postmaster
Reged: 04/19/04
Posts: 8279
Loc: Beatrice, Nebraska
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Yup, that one is tough mainly because of its size. In my 100mm f/6 refractor, it shows up as a dim diffuse glow superimposed on the central star cluster with only hints of irregularity (using the DGM Optics NPB filter). With the OIII, the nebula gets smaller and a little sharper, but if I really want to see detail in it, I have go to with a much larger aperture. In my 9.25 inch SCT, I had to pan around quite a bit (59x, 1 degree true field of view, DGM NPB filter), but despite the nebula's faintness, I was able to trace several irregular dark spots and lanes in the interior. Most notable is the wide wedge-like inclusion into the north end of the nebula, ending in a more definite dark spot (Barnard 161). Clear skies to you.
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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info
Prairie Astronomy Club
http://www.prairieastronomyclub.org
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