Ravenshead Observatory


Dates & Location	October 13th - 21st 2011 using the SMAP site at Weed, New Mexico. Elevation 7269 ft. Lat 32.8°N Long 195.5W	Catalogue identification	The Cygnus Bubble planetary nebula, PN G75.5+1.7
Equipment Used	Officina Stellare RC400 at 3304mm focal length Paramount ME German equatorial Mount Camera SBIG ST-11000M with FW-5L filter wheel. TheSky V6 telescope control CCDSoft V 5.0 camera control.	Where it is in space	Dave Jurasevich of the Mount Wilson Observatory in California first discovered the "Cygnus Bubble" while recording images of the region on 6 July 2008. A few days later, amateur astronomers Mel Helm and Keith Quattrocchi were also able to confirm it. The Bubble is extremely faint in the light of Hydrogen-Alpha and almost invisible in natural RGB light. It lies 41 arcmin south-east of the Crescent Nebula NGC 6888 in the constellation of Cygnus and is within our own Milky Way galaxy.
Acquisition	Remote session using RADMIN PC control from Ravenshead, UK. HaRGB exposures:- 620:100:100:100 mins total using 20 min Ha and 10 min RG and B sub-exposures at -20°C and -25°C. All images binned 1x1. AllC	What it is	This object was discovered very recently - later than most modern catalogues were updated. It is thought to be a very symmetrical planetary nebula (expanding shell of a supernova star). It's diameter has been calculated at almost exactly 4 arc minutes, but its true dimensions are not yet known.
Processing Methods	Image acquisition and telescope control with CCDSoft V5. Remote acquisition sequence program CCDAutoPilot.
	Data reduction and Luminence De-convolution with CCDStack.
	Master RGB image and Master Ha Images prepared and finished with Photoshop CS2. Final LRGB image using PhotoShop CS2

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