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Another possibility is the autoguider was going nuts and doing really big corrections as it lost the guide star or was set incorrectly. For example when you slew to the other side of a GEM you have to click the reverse X box so the corrections are issued for the other side of the mount otherwise the X errors build up and up and up as the corrections are going the wrong way.
Perhaps why the squiggly tail. The other stars may not have been bright enough to expose well?
greg.
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