 Ivanov's flight lasted one day, 23 hours and one minute, completing 31 orbits.The Mir space station core module was launched in February 1986 and the Spektar-256 system, a follow-up to the Spektar-15, was to be fitted on the station.During an official visit to the Soviet Union in 1986, Bulgarian defence minister Dobri Dzhurov arranged for a Bulgarian cosmonaut to be sent to the station with Soviet assistance.