Auto Guiding Issues on M42

[Paul Smaglik]

i have a WO GT 81 mm with an asiair prro, with ZWO guide4 camera using a Ioptron GEM 28 mount.  The problem that I am having when imaging M42 at 600 Seconds.  I am good for the first three or four images but after that my auto guiding goes to sh$#.  So any advice that you have it is greatly appreciated.

 

Paul

[ollypenrice]

Possibilities:

The guide camera or scope dews up during the run.

A cable or other obstruction starts to drag.

You have a voltage issue, notably in the supply to the mount.

Polar alignment is out meaning that the effects of the error increase over time from when calibration was performed. (Note; I'm not absolutely sure about this one! )

If you use PHD2 to guide, run the guide assistant.  If you're not using it, try it.

Olly

[newbie alert]

The ioptron 28 has a long worm period of 600 secs, but in theory if it can do a full revolution without issues then it can do a few more...

I'd check your PA and run the guide assistant for at least a full cycle