Leo the lion – 16th April 2012

From the star charts and books I knew Leo provided at least one opportunity to see two, may be galaxies within the same field of vision.

I headed for the galaxy pair M65 and M66, both type Sb (Spiral with less tightly wound arms).  There was a possibility of also capturing NGC 3628 alongside, also a type Sb galaxy.

M65 and M66 were just about visible visually through the telescope, although any detail was lost.

For imaging I have been getting slightly braver with these faint objects and for this I used a series of 2min 30sec exposures.  The problem with longer exposures is camera noise and tracking error (as the telescope tries to track the moving sky).  In total I took 39, of which around 32 were usable, so as a composite there is a total of 1 hour 20 mins of exposure time here.  I think this is starting to pay off as the images become a bit more detailed and somehow slightly softer and three dimensional.  I’m also being a lot more disciplined about taking groups of 10 light (picture) frames followed by 5 dark frames, and processing these in groups.  This has all but eliminated the camera readout noise caused by the electronics heating up over time.

M65, M66, NGC 3628, Leo
M65, M66, NGC 3628, Leo