M101 is a grand design spiral galaxy that is 2/3 larger than our own Milky Way, spanning some 170 thousand light years across. It is seen nearly face on from our perspective.
Acquisition Details
Lum = 48x10min
RGB = 24x10min each
Hα = 28x20min
Total = 29hrs 20min
2017
SV80ST f/6
QHY163M
Optolong LRGB
Mach1GTO
L=112x1min RGB=45x2min each
Total time = 6hrs 22min
This is my first LRGB image with a new camera (QHY163M). Processing
done in PixInsight.
2015
APM115 @ f/5.4 Riccardi .75x Reducer Atik 383L+
Losmandy G11 Gemini 2
L=14x15min B=11x15min
G=8x15min
R=6x15min Ha=11x20min
Total time = 13.5hrs
Subs calibrated, registered and stacked with DeepSkyStacker
Photoshop: levels/curves, smartsharpen filter, high pass filter, reduce
noise filter, Gradient Xterminator
2012
APM115 @ f/5.1 AP 27TVPH reducer
Atik 383L+
Losmandy G11
L=45x10min
RGB=18x10min each Total time = 16.5hrs
Subs calibrated, registered and stacked with DeepSkyStacker
Photoshop: levels/curves, smartsharpen filter, high pass filter, reduce
noise filter, Gradient Xterminator This image is the first taken
with an AP 27TVPH reducer, without a flattener. The stars have an irregular
shape that I hope will be resolved with the addition of a field flattener.
2011
Atik 383L+
AT8RC @ f/6.2 CCD67T Reducer Losmandy G11 guided with
AT65EDQ, Lodestar, PHD Guiding
L=34x10min RGB=12x10min each