This periodic error can be corrected (see “Error! Reference source not found.” on page Error! Bookmark not
defined.) so that the corrected periodic error is below errors introduced by local seeing. In other words, the
tracking error introduced by mechanical periodic error is “in the noise” and not readily detectable at the eyepiece
or in the measured FWHM of stars on a CCD photo.
Under all but extremely exceptional seeing conditions, measuring periodic error can be difficult, even using an
autoguider, because the random errors caused by local seeing conditions can be larger than the actual periodic
error of the worm and gear.
The Compute PEC Curve tab offers an extremely powerful algorithm that can be used to precisely determine the
mount’s periodic error, independent of the errors introduced by local seeing conditions.
To Next Page
Loading...