The OJ 287 colors during a multiwavelength campaign

In 2005 the blazar OJ 287 exhibited an interesting variable behavior in the optical band. An optical outburst was observed in the period Oct.-Nov. 2005, and two XMM-Newton X-ray observations were performed in correspondence with two active optical states of the source (an intermediate flare and such claimed outburst). These satellite pointings triggered and invited observations by several radio, mm, near-IR, and optical ground-based observatories. During an intensive WEBT campaign coordinated with the satellite observations, and longer-term monitoring observations, a rather good set of multi-band optical and near-IR photometric data was collected. Such multicolor data of OJ 287 are briefly introduced.