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We report V, R, and I band CCD photometry of the radio galaxy 3C 390.3obtained with the 1.56-m telescope of the Shanghai Astronomical Observatoryfrom March 1995 to August 2004. Combining these data with data from theliterature, we have constructed a historical light curve from 1894 to 2004 andsearched for periodicities using the CLEANest program. We find possible periodsof 8.30+-1.17, 5.37+-0.49, 3.51+-0.21, and 2.13+-0.08 years.

Optical Monitoring of 3C 390.3 from 1995 to 2004 and Possible Periodicities in the Historical Light Curve