[joeman (Joe Turner)]

Hi,
I have a Celestron 9.25" + Canon 1100D setup and last night I was able to try out another piece of Camera software called entangle on Linux.

I was able to do my alignment quickly...
2 star
+ 4 calibration stars.

Then I did my Polar alignment using live preview. It was quite a good experience compared to many years ago.

I then decided to try and take a 200 second exposure of sombrero galaxy but I am getting some movement in both RA and DEC. Just doesn't make much sense. I would have thought I'd be getting perhaps some north/south movement due to minor Polar alignment discrepancies, but RA, not sure why.

(See attached image)

Looking at image it LOOKS like it does a "jump" between...rather than a trail.

Sombrero galaxy at the time of taking was in north West Sky.

I did try setting a timer and walking out of the shed...incase I was "somehow" making vibrations on the floor, but no help.

I am thinking I'll try the drift alignment...200 seconds track RA EAst then 200 seconds track RA WEST...but not too sure this will help too much...well not the RA component of the drift.

Any ideas?

Thanks

Joe