Date Posted: 9/10/2023
Date Taken (LRGB): 5/13/2016, 5/15/2016, 6/7/2016
Date Taken (Ha): 6/11/2023, 6/12/2023, 7/11/2023
Scope: Planewave CDK 12.5 f/8, 2541mm
Camera: SBIG STL-11000 with Astrodon Tru-Balance E-Series Gen2 filters
Temp: -15C
Mount: Losmandy Titan
Guiding (LRGB): SSAG, Celestron 80mm guide scope, 600mm.
Guiding (Ha): On-axis via ONAG-XM and SX UltraStar at 2541mm. FocusLock real-time focus for focusing.
Exposure: LhaRGB 160:885:75:85:85 LRGB subs 5min, Ha 15min. Luminance and Ha unbinned, RGB binned 2x2.

Calibrated and Stacked with CCDStack2; RGB combine and DDP with MaximDL. Processed with CS4.

This image adds substantial Ha exposure (14.75 hours) to the previous LRGB image, bringing total exposure time to 21.5 hours.

I did not re-process the LRGB image; I simply added the Ha signal to it. By using StarXTerminator to create starless versions of both images, I was able to add the Ha without distorting star sizes and colors; After re-adding the LRGB I used StarShrink to then reduce the size of the stars from the original image. I couldn't believe how much of the extended outer regions showed up in the later version. The image could probably be be improved with better re-processing of the original LRGB data, but I am quite pleased with this as it is.