In this paper, the long-term historical optical (UBVRI) and near-infrared (
JHK) data are presented with some new observations in the optical (February
1994-January 1995) and near-infrared (November 1995) bands included for BL
Lac object OJ 287. The new optical data in V-band are in agreement with th
e results reported by other authors (Sillanpaa et al. 1996a; Arimoto et al.
1997), a close correlation between the color index of B - V and the magnit
ude V has been obtained from our new observations. The new infrared observa
tions presented here indicate that the source was at a high level in the in
frared band during the observation period. From the available literature, w
e have got that the largest variations for UBVRIJHK bands are respectively:
Delta U = 4.(m)72; Delta B = 5.(m)93; Delta V = 5.(m)18; Delta R = 4.(m)45
; Delta I = 4.(m)07; Delta J = 3.(m)87; Delta H = 3.(m)78; Delta K = 3.(m)5
4. A strong correlation is found between the optical and near-infrared band
s when the DCF method is used, which suggests that these two bands have the
same emission mechanism.