Mosaics are cool, but they are tough!
This is a 4-panel mosaic. I had started with the Heart Nebula and decided to try to do a mosaic. I used Sequence Generator Pro’s Framing and Mosaic Wizard tool to plan the framing based on the initial Heart nebula data. I was pleasantly surprised how well the tool works but found out the hard way how difficult mosaics are to process. This was only two channels, known as bi-color. This image is made up of Hydrogen alpha and Oxygen III data. The blend is Red – Ha, Green – mix Ha+O3, Blue – O3. I wish I had gotten SII so that I could do the Hubble Palette but I knew how important getting enough O3 was and I was limited by available clear nights.
It is difficult to get all of the stars to line up among all the frames and all the panels for both the Ha and O3. I am fairly happy with how it turned out, though I wish I had more data.
Ha: 260×90″ (gain: 200.00) -20C bin 1×1
O3: 360×90″ (gain: 200.00) -20C bin 1×1
Integration: 15.5 hours
Avg. Moon age: 19.05 days
Avg. Moon phase: 31.20%
Bortle Dark-Sky Scale: 9.00
RA center: 40.602 degrees
DEC center: 61.214 degrees
Pixel scale: 2.027 arcsec/pixel
Orientation: -140.278 degrees
Field radius: 2.765 degrees