From photoeIectric photometry at our 90-cm telescope we derived continuum and emlssion band fluxes within the bandpasses of the.standard IHW filters. These data were converted to give product ion rates for CN, C3, C2 , and soIids. The observations cover the range of pre-periheIion distances from'^2.1 AU to 1.1 AU and include one post-periheI ion measurement at 1.7 AU. The product ion rates of the gaseous components show a strong dependence on heliocentric distance. The result is compared with the behaviour of other comets and theoretical considerations. The dependence is less steep for the solids. This may be due to relatively pronounced backscattering of the grains. During one pre-perihe ion night (r = 1.5 AU) intensity profiles along three sections through the coma of P/Halley were measured. Compared with the Haser model the
profiles show a global anisotropy of the coma and possibly local structure.
The eclipsing binary SV Cam shows photometric features that suggest its membership to the RS CVn group. The existing light curves (covering the period 1947-1986) have been analyzed in order to isolate the contribution of the vave-like distortion; all the observations support the presence of an activity cycle, with a duration of about 10 years. By suppressing the contribution due to the stellar activity, we have derived an "average" light curve, cleaned from the effects due to the spots; this light curve has been analyzed by means of the Wood Computer code in order to get the physical parameters of the system.