This is a mosaic of three panels of the Veil nebula, done in summer 2014. It was a really though job, considering the bad weather we had. ANyway, each panel has a total of about 8 exposures for each LRGB channel, each of 10 minutes time. (so 16 hours of data).
I had not enough Ha7 data to add it to the mosaic, but maybe it will be added sometime.
Processing was really a trial and error thing. With Pixinsight, I planned to compose every channel and then combine it, but it didn’t work well. At the end, I finished every single panel in LRGB and combined it in Photoshop, which was a breeze (but might get complicated with larger mosaics). the GradientMergeMosaic tool pf Pixinsight made too many artefacts with this data to be really useful, sadly.
|Center (RA):||20h 56m 32.842s|
|Center (Dec):||+31° 21′ 48.008″|
|Apparent size:||36.5 x 36.5 arcmin|
|Pixel scale:||0.54 arcsec/pixel|
|Orientation:||Up is -100 degrees E of N|
|Date||15th July to 29th August 2014|
|Images||LRGB – each channel 8x 10 minutes – 3 panels|
|Optics||Cassegrain f/9 20″ @3550mm|
|Filters:||Luminance; Red; Green; Blue from Baader|
|Software:||ASA Autoslew (beta) for automatic image capture|
|Processing:||with Pixinsight and Photoshop for mosaic combination|