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This paper aims to study the color behavior of the BL Lac object OJ 287during optical outburst. According to the revisit of the data from the OJ-94monitoring project and the analysis the data obtained with the 60/90 cm SchmidtTelescope of NAOC, we found a bluer-when-brighter chromatism in this object.The amplitude of variation tends to decrease with the decrease of frequency.These results are consistent with the shock-in-jet model. We made somesimulations and confirmed that both amplitude difference and time delay betweenvariations at different wavelengths can result in the phenomenon ofbluer-when-brighter. Our observations confirmed that OJ 287 underwent adouble-peaked outburst after about 12 years from 1996, which provides furtherevidence for the binary black hole model in this object.

Color Behavior Of BL Lacertae Object OJ 287 During Optical Outburst