Veil Nebula mosaic (3-panel)

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.

Details, courtesy by

Sky location, courtesy by


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
Veil Mosaic, 3 Panel

Veil Mosaic, 3 Panel

Target Veil Nebula
Date 15th July to 29th August 2014
Images LRGB – each channel 8x 10 minutes – 3 panels
Optics Cassegrain f/9 20″ @3550mm
Mount: ASA DDM85XL
Filters: Luminance; Red; Green; Blue from Baader
Software: ASA Autoslew (beta) for automatic image capture
Processing: with Pixinsight and Photoshop for mosaic combination