April 17-18, 2012; Casitas, NM
TEC 140 mm, f7, AT2FF field Flattener, Canon Hutech 400D @ ISO 800, AP Mach1 mount, 50
mm f5 guide scope
Cropped, full resolution, 1.2 arcsec/pixel.
4 x 10 min subs = 40 minutes, 2 darks (not enough, lots of hot pixels)
M81 and M82 require different processing, this is the best compromise. Individual processing of each galaxy can be found below. I am not clever enough yet to recombine when done.
M81: (from above)
After discovering that Holmberg IX is close to M81 I reprocessed the above pic to bring out maximum faint detail in M81 (using Image Plus). And there is Holmberg IX; the fuzzy patch below M81 -:)
Technical details as above; except these M81 pics are binned 2x2 yielding a resolution of 2.4 arcsec/pixel.
In addition to M81 and Holmberg IX, I count at least 11 additional galaxies in this pic. No doubt there are more but I got tired of looking. See the labeled pic next below. Based on the Sky Tools 3 chart, further below, I estimate that this pic goes to m = 19+. Galaxies magnitudes are notoriously suspect for faint galaxies. That said, galaxies to m = 19 are also visible. I really need a two hour exposure now!
M81: Labeled pic.
M81: Sky Tools 3 Chart
Stars to m = 19.
M82: (from above image)