Speaking of planetary nebulas reminded me of the meeting OAS had last night. It was a real treat. Stacy Palen, a new professor at Weber State, spoke to us about her research on Planetary nebula. She is studing planetaries in the LMC and SMC using the NTT in Chile. It was very interesting. She shared pictures from her trips down there and some of the data that she has collected. -----Original Message----- From: Chuck Hards [mailto:chuckhards@yahoo.com] Sent: Friday, March 14, 2003 1:51 PM To: utah-astronomy@mailman.xmission.com Subject: RE: [Utah-astronomy] Urban astronomy Most, if not all planetaries emit at O-III, but I'm not sure about diffuse nebula; sounds like some of them do also from your experience. The O-III bandpass is very narrow, even compared to an UHC or other narrowband filter. Technically, the Veil is what's left of a planetary if you give it enough time, so the O-III should work with it. For city observing, I find the narrowband the most useful, a broadband works well at very high powers, when the sky background is naturally dimmed anyway. My O-III experience is from borrowed filters, I don't own one. C. --- David Dunn <david.dunn@albertsons.com> wrote:
I have found the OIII to improve the contrast of the Veil, Planetaries and nebulas like Orion, the Eagle and Lagoon. I think that the OIII helps the Veil and the planetaries the most. Are these OIII emitters?Some of the nebulas become better with a UHC but I think that I like the OIII the best for most of the observing that I do.
-----Original Message----- From: Chuck Hards [mailto:chuckhards@yahoo.com] Sent: Friday, March 14, 2003 1:27 PM To: utah-astronomy@mailman.xmission.com Subject: Re: [Utah-astronomy] Urban astronomy
--- UTAHDEB@aol.com wrote:
I think an OIII filter is required for city observing
Do you mean required for the Veil, or city observing in general? An O-III filter will only improve objects that are emitting light at the O-III wavelength.
C.
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