Abstract
Based on the international AGN watch of NGC4151 groundbased optical observational data. some significant periods of NGC4151 light variation are obtained by means of the Periodogram Analysis and stepwise Regression Analysis. There exist two major periods. One is about 14 days for all bands. Another is about 30 days for all continuum bands, but 24 and 38 days for Ha and HP, respechvely.
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