[g__day (Matthew)]

Folk,

Looking at the sawtooth pattern of the DEC guiding (see attached) does the red line mean I have a gradually DEC drift (I estimate I'm within an arc minute of the SCP on a permanently mounted rig).

The pixel scale was about 1.5 arc seconds per horizontal line in the graph - with each of the data points being about 5 seconds apart - the graph shows 500 data points, and there's 18 teeth to the saw - with a pitch of about 3 lines - 4.5 arc seconds.

So if I interpret this correctly (a big IF) I see on the downside about 50 arc seconds of drift in about 40 minutes. Can anyone tell me am I reading this graph correctly?

Basically drift RA looks random +/- 1.5 arc seconds, but DEC drift looks sawtooth - meaning improving my polar alignment just a tad will likely improve my tracking even further.

Thanks all,

Matthew


Matthew