OJ 287 and the predicted fade of 1998

There were predictions that blazar OJ 287 should have faded in late 1997 or early 1998; The observational background for these predictions is the sudd en fade of OJ 287 in 1989. Back then, the radio flux decreased steadily for 4-5 months and then the brightness dropped also in the optical region sudd enly for 2-3 weeks to all time low values, e.g,V=17.4 mag. The predictions are based on a binary black hole model, where the companion black hole and its accretion disk eclipse the emission areas of the primary black hole. We have made observations of OJ 287 during the time of the predicted fade. Th e results show that, in the optical, OJ 287 starts to fade almost linearly in December 1997 until mid-February 1998, when it suddenly shows a sharp ri se and sharp fade, and starts to get brighter again. The radio observations show no signs of variability, but the radio Bur has been very low since th e 1995 outburst. We also have earlier observations since Fall 1993 to Sprin g 1998, which show that the local minimum reached in February 1998 was the lowest since 1995. We have made observations with several telescopes in the optical (UBVRI) and radio (22 and 37 GHz) bands. We discuss the various ev ents in the light curves and their implications on the proposed models, esp ecially the binary black hole model by Lehto & Valtonen (1996), which was u sed to make the prediction of the time of the fade.