Equatorial Platforms - CCD Images by Doug Askew

CCD Images by Doug Askew

Doug Askew took these images using his 15" Obsession on an Equatorial Platform. An HX9 CCD camera was used at prime focus to take multiple short exposures (typically 10-15 seconds). These exposures were then stacked to get the final image. Note that all exposures were UNGUIDED. While Doug used a Dual-axis Platform for these images, similar results can be achieved with a Compact or Single-axis Platform using the same technique -- stacking a series of short (10-30 second) unguided exposures." The images of M81 and M82 both were 15 15second exposures stacked, using the same equipment as was used for the others.

M79	M108	M81
M82	M109	NGC2903
M51	M65	M66
NGC2681	M101	NGC4568
Abell 1367 12 images 30 seconds each, summed.	NGC4565 9 images 30 seconds each, summed.	M106 29 images 30 seconds each, summed.
NGC3628 6 images 30 seconds each, summed.	NGC3753 10 images 30 seconds each, summed.	M65 45 seconds.
Seyfert's Sextet 9 unguided images 20 seconds each, summed.	NGC4762 17 unguided images 30 seconds each, summed.	M88 15 unguided images 20 seconds each, summed.
M91 15 unguided images 20 seconds each, summed.	M99 15 unguided images 20 seconds each, summed.	M100 15 unguided images 20 seconds each, summed.
M17 17 unguided images 15 seconds each, summed.	M20 10 unguided images 20 seconds each, summed.	M16 6 unguided images 20 seconds each, summed.
M15 35 unguided images of 8 seconds each, summed.	M8 19 unguided images 15 seconds each, summed.	NGC7023 15 unguided images 20 seconds each, summed.
NGC7635 24 unguided images of 10 seconds each, H-Alpha summed.	M16 26 unguided images 15 seconds each, summed.	M27 26 unguided images 10 seconds each, H-Alpha summed.
NGC891 30 unguided images of 10 seconds each, summed.	NGC925 12 unguided images of 30 seconds each, summed.	M22 18 unguided images 15 seconds each, summed.
NGC7331 15 unguided images of 15 seconds each, summed.	NGC7479 8 unguided images 30 seconds each, summed.	M33 8 unguided images 30 seconds each, summed.