In the presented paper we are investigating the color indices of targets situated at the geostationary orbits. To get the color indices we performed five nights of observations at the Astronomical and Geophysical Observatory FMPI CU, Modra during the summer and fall 2012 and during the winter 2013. The main targets were stable spacecrafts and rocket bodies. In three cases we also observed fragments of the Titan 3C rocket body which fragmented on GEO in 1993. Two types of observations were used. During one station observations the measurements were performed by the 0.6-meter Zeiss telescope with 3.29-meter focal length and with Johnson/Cousin BVRI filters. For two simultaneous observations the 0.6-meter Zeiss telescope and 0.28- meter Celestron EdgeHD telescope equipped with Johnson/Cousin R filter were used. We calculated astrometric positions of selected targets by our own package Sateph and by using the public catalogue.