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Chapter 10 The plots of the data that you acquire are proof that you can measure the bright- ness of an asteroid or variable star with a reasonable degree of precision. They’re also what you need to take the next big step, which is analyze the data so that you can determine the period and amplitude of a lightcurve and, even more fascinating, create a likely model of a binary star system. 10.1 The Quality of Data Before you begin working with the data, you should review it for any obvious problems standing in the way of your goal of finding the period and amplitude. I usually plot the raw data of the latest session before trying to analyze the data for a period or amplitude or merge it with other sessions. Fig. 10.1 shows why this is a good idea. It’s extremely unlikely that the one point at upper right is real. It could be the result of a cosmic ray hit, a passing plane, or any number of causes for an exces- sively hot pixel within the measuring aperture of the target. My method is to re- move the data point from the plot and calculations but
Published: Jan 1, 2006
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