I submitted the image, Tarantula Nebula under Urban Skies - 17 Hour exposure in the Feb image/sketching contest. Well, why not let others play with the data. I am making it available under the condition that you show the results and let us know what you did. I would like to know as I am trying to learn this image processing stuff.
I know there is coma and image tilt – and it kills me. I’m still working that stuff out. Several nights the scope was buffeted by winds, but in the end, there is a lot of data available. This image started out as an experiment. I think it took seven nights when stuff actually worked. On those nights, the drill was dragging the mount out and setting the gear up from scratch, polar aligning, imaging, and then tearing it all down again after a nights imaging. It seems that the norm here is for the clouds to roll in after setting up and polar aligning. That’s harsh. Well, at least I mastered the whole polar alignment in the city with no pole star (Southern Hemisphere).
Melbourne Australia. (15 km from CBD)
Vixen R200SS with comma corrector (f4 8 inch newt) – stock focuser
Astro-Physics AP900 mount.
First generation ST-8300 mono running at -15C
Baader Narrowband Filters: SII 8nm, H-alpha 7 nm, and OIII 8.5nm
SII 17 x 20 min mapped to Red
Ha 18 x 20 min mapped to Green
OIII 16 x 20 min mapped to Blue
CCDStack2 was used to calibrate, register, normalize, perform data rejection, and final stacking. The three FITs images are not sharpened in anyway. They are just as they came out of the camera – ready for processing – so I’m not hiding any mistakes here. This is meant to be a learning exercise.
Data in the raw is available at…
The three images are in Fits format – 32 meg each. One for SII, Ha, and OIII.
Have fun; let’s see what you can do.