Ilha da Trindade, Brazil: Oval silvery object near Navy weather balloon for nearly 3 hours
One morning in November 1957, while the Brazilian Navy meteorological station on Ilha da Trindade tracked a weather balloon, Capt. Carlos Alberto Bacellar and a theodolite technician saw an oval, silvery object near the balloon that stayed in view for nearly three hours.
Background
In the morning, the newly established Brazilian Navy meteorological station on Ilha da Trindade was tracking a launched weather balloon by radio and with a theodolite when the balloon's radio signals suddenly changed frequency. The technician at the theodolite told Capt. Carlos Alberto Bacellar that there was another object near the balloon. Bacellar went out and saw a silvery speck moving from side to side and making tight turns. Through the 20x theodolite scope the object looked distinctly oval, silvery white, and reflected sunlight from a metallic surface; it occasionally changed shape. The balloon burst at the expected time, but the object remained in sight for nearly three hours. Olavo T. Fontes described the case in the APRO Bulletin in January 1960. The account follows the entry in George M. Eberhart's chronology UFOs and Intelligence (CUFOS) and the sources cited there; it is not an independent determination by From Beyond Space.