|
Well, Ill stick my neck out ;-).
I assume the 1st graph is guided and the last 2 arnt and all graphs are arc/secs or pixels, which doesnt matter as your scale is 1:1.
Since there is no horizontal time scale, ill also assume the guide exposures are 1 to 3 seconds odd.
The 1st graph shows 2 arc/secs P/P 0.45 RMS. The variation you see is probably seeing. This graph my friend, is pretty much the best you will see on a well tuned G11 in average urban skies, there is absolutely nothing wrong with the guiding as shown.
If you have elongated stars with that guiding, then the guiding aint the problem. It may not always be like that though, you may have an intermittent problem that did not occur during the 1st graph.
The 2nd graph (tracking only?) is also fairly normal, with drift due to off polar alignment. I cant tell how off the alignment is, because I dont know the graph time scale. The short variations there is seeing, and is almost the same as with guiding, so the guiding is fine.
The 3rd graph (tracking only?) hints at a possible intermittent problem when the RA levels off then shoots off near the end. This could be a bunch of mechanical things Marc has mentioned. IMO the drive/tracking is fine, and its an intermittent mechanical issue that out of all your graphs, is only really hinted at in the last graph.
I think Marc had it nailed all along, its a simple mechanical problem. Binding worm?, slipping clutch?
|