Richard Crisp wrote:
I began this over the July 4th holiday and took my most recent data last
night, Aug 3

This is 12 hours of [SII], 10 hours of [OIII] and 7 hours of Halpha

It was shot using the TK1024 powered FLI Dream Machine camera (1kx1k @24x24
micron pixels at about 85% QE) using 4.5nm Cust Sci emission line filters on
the Stinger 450 classical cassegrain using a Lumicon Giant Easy Guider with
focal reducer for a focal length of 3366mm (~f/7.1). You just can't beat
those TK1024 chips and other such similar chips for going really deep. The
combination of the high QE, the deep wells and the big pixels, it really
makes for a fast camera that is just wonderful for deep emission line
imaging with tight filters.

I am intrigued by the sulfur channel data (red in this palette). I am seeing
detail I've not seen previously in shallower exposures.

I may take some more exposures, but am getting a bit tired of this object
after shooting it for the past month.

http://www.narrowbandimaging.com/m27...2hao3_page.htm

Looks like most of the outer shell is oxygen with a bit of helium and
not much sulfur. Interesting how it is somewhat segregated into areas
like that. You have had a lot more good nights than I have! I get an
hour here and there of sort of clear with horrid seeing. Not a summer
for imaging so far anyway.

Rick


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