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This particular sequence was part of a test to check the drive sector of a Byers 812 mounting. The full sequence of 337 images spans 84 minutes. The first datum is the name of the file, the second the shift in the jc axis, and the third the shift in the y axis. You can analyze these measurement data with the aid of spreadsheet software or write a program to read the data and plot them.

• Tip: With AIP4Win, you can export tracking data to a spreadsheet such as Excel for analysis of your telescope's tracking errors. Use the Multi-Image function to measure the centroid of a star in a test set of images automatically.

The first step is to convert the tracking errors, which were measured in pixels, into arcseconds. Recall from Equ. 4.3 that the conversion factor is dpixel, the width of a pixel in arcseconds:

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