Vostok 4

Infobox Space mission
mission_name = Vostok 4
spacecraft_name =
shuttle =
insignia = vostok3-4patch.png insignia_size = 200px
sign = Беркут (Berkut - "Golden Eagle")
crew_members = 1
launch_pad =
launch = August 12, 1962
08:02:33 UTC
Gagarin's Start
begin_spacewalk =
end_spacewalk =
landing = August 15, 1962
06:59 UTC
coord|48|9|N|71|51|E|
duration = 2d/22:56
orbits = 48
apogee = 211 km
perigee = 159 km
period = 88.2 minutes
altitude =
inclination = 65.0°
distance =
mass = 4728 kg
crew_photo =
crew_caption =
previous =
next =

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 manned spacecraft were in orbit at the same time. The two capsules came within 5 km 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.

The re-entry capsule is now on display at the NPO Zvezda Museum in Moscow, but it has been modified to represent the Voskhod 2 capsule.

Crew

Number in parentheses indicates number of spaceflights by each individual prior to and including this mission.
*Pavel Popovich (1)

Backup crew

*Vladimir M. Komarov

Reserve crew

*Boris Volynov