|Object||Dumbbell Nebula- M27|
M27 is a large and bright planetary nebula located in the constellation Vulpecula. It is the most conspicuous of its kind in the night sky. At 8th magnitude it covers an area 1/4 the diameter of the full moon. M27 is 1000 l.y. away.
|Date||5;11/ 8/ 05|
|Location||BayTop Observatory- Streaky Bay South Australia|
|Instrument||Orion ED80 refractor working @ f7.5|
|Mount||Vixen 'GPDX' controlled by a Mel Bartels Goto System|
|Camera (CCD)||Starlight Xpress HX516 monochrome with Hm, made filter slider|
|Exposures||L: 132' R:24' G:24' B:24'[(Total exposure time Lrgb=3.4hrs) 6' sub exposures all unbinned] Dark frames removed. Extinction factors applied .|
|Guiding||Sky Watcher-f5 ST Refractor & a Meade LPI imager attached with main scope on a home made accessory plate|
|Filters||Astronomik Type 2 CL-.RGB set|
Conditions- When taking the luminance subs I had to be well timed to take advantage of when the object was almost at its highest point being 33 degrees in the north. Not very high in the night sky for imaging but conditions weren't too bad. When taking the colour subs, I had to wait almost a week before conditions and weather cleared. Was lucky on the 11th as the moon set to the west, the sky cleared long enough to get a little over an hours worth down. Some times things just work out.
Both the rgb sets and lum have been 'drizzle combined' coefficient resampled to 120% in IRIS.