|Mission Name:||Vostok 4|
|Call Sign:||Berkut (Беркут, translated as "Golden Eagle")|
|Number of Crew Members:||1|
|Launch:||August 12, 1962|
|Landing:||August 15, 1962|
|Duration:||2 days, 22 hours, 56 minutes|
|Number of Orbits:||48|
Vostok 4 was a mission in the Soviet space program. It was launched a day after Vostok 3 with cosmonaut Pavel Popovich on board - the first time that more than one crewed spacecraft was in orbit at the same time. The two capsules came within 5km of one another and ship-to-ship radio contact was established.
The mission went largely as planned, despite a malfunction with the Vostok's life-support systems that meant that cabin temperature dropped down to 10°C. The flight was terminated early, after a misunderstanding by ground control, who believed that Popovich had given them a code-word asking to be brought back ahead of schedule.