EL OBJETIVO DE ESTE TRABAJO ES EL ESTUDIO DE BLAZANES Y DE QUASARES EN GENERAL, CON LA INTENCION DE ESTABLECER LAS POSIBLES SIMILITUDES Y DIFERENCIAS QUE PUEDAN CLARIFICAR LA CLASIFICACION DE ESTOS OBJETOS. CON ESTA IDEA SE HA DESARROLLADO UN IMPORTANTE PROGRAMA OBSERVACIONAL EN EL VISIBLE E INFRARROJO ESTUDIANDO LA VARIABILIDAD DE ESTOS OBJETOS

Results of a five-month campaign of optical monitoring the Seyfert 1 galaxy NGC 4593 are presented. High resolution H-alpha and H-Beta spectra and direct images in the Johnson U, B, V, R, and I bands were obtained between January and June 1990. The emission lines and the continuum showed strong variations on time scales of weeks to days. The H

We present lightcurves ofasteroids 31 Euphrosyne, 196 Philomena and 471 Papagena and apply two different amplitude-aspect methods for pole and shape determination.

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We present a detailed analysis on photopolarimetric monitoring on OJ 287 conducted at the Nordic Optical Telescope during January 1991. Large rapid variations were observed in flux, polarization and position angle; the largest being a 40% increase in the flux with a simultaneous 55 degree position angle rotation in five hours. Changes in the