Irregular Galaxy - The Large Magellanic Cloud - Satellite Galaxy of the Milky Way
The Large Magellanic Cloud Central.
Central Region of The Large Magellanic Cloud.
Mosaic Panels: 3
Exposures per mosaic panel: R:5 hours + Ha:5 hours , B:5 hours + OIII: 5 hours (20 hours per tile, 60 hours total)
Total Field Covered: 240 x 130 arcminutes.
Dates: 12th, 13th, 22nd and 23rd November, 2nd, 3rd, 12th and 13th December 2009.
Location: Gold Coast, Queensland.
Sub-Image calibration and per-filter colour image sigma rejected addition with CCDStack.
Background correction using the PixInsight software's Dynamic Background Extraction Tool.
Green Synthesis, RGB combination, mosaic assembly, levels and Adobe RGB 1998 colourspace conversion with Adobe Photoshop CS4.
This image was an experiment in dealing with light pollution from my site by blending Narrowband filters with RGB and synthesizing Green, usually the most problematic colour.
Using Ha and OIII filters to limit the earthly glows and blending the flat backgrounds from these with standard Red and Blue filters.
For this particular image, being a mosaic, there is approximately 60 hours of exposures here without taking any Green or SII, which would have required another 30 hours of exposures in this case.
In an attempt to limit light pollution influences and also reduce the total amount of time needed to take all the exposures for this three-panel, pseudo RGB image, the Green channel was synthesised from the combined R = R+Ha and B= B+OIII images.
Telescope: Takahashi FSQ106ED
Focal Length: 390mm
Camera: SBIG ST10XE
Pixels: 2184 x 1472 x 6.7um
2010 Royal Observatory Greenwich -Astronomy Photographer of the Year shortlist.