Image of 3hrs and 38m taken in subs of 1 and 2 minutes.
Esprit 120, ASI2600MC Gain 100, F7, EQ8 ; stacked in AstroPixelProcessor and developed in Photoshop.
The sky was very foggy, sqm around 20,15.
When scanning for little galaxies, several very small galaxies were identified using SIMBAD at apparent magnitudes below 20. As an example:
2MASS J09533544+6908169Type: IR<10um
My previous processing of M109 – 360x60s – did not turn out well. Serious issues with noise, most likely calibration files that were not ok.
So I did a complete re-build of the calibration files darks and bias.
The resulting stack and processed image is noticeably better:
Imaging over two nights in April, 314 frames were colelcted, 101 frames 120″ and 212 frames 60″ at Gain 100.
This gain value did not raise up to expectations, I could see more noise in the end result easily. Compared to what I’m used to at Gain 0 with this camera.