Evaluate effects of prolonged space flight. Demonstrate and evaluate
performance of spacecraft and systems in 4-day flight. Evaluate
procedures for crew rest and work cycles, eating schedules, and
realtime flight planning. Spacecraft weight: 3574kg.
Secondary objectives included: Demonstrate and evaluate EVA and
control by use of HHMU and tether. Stationkeep and rendezvous with
second stage of GLV. Evaluate spacecraft systems. Make in-and-out-of
plane maneuvers. Further test OAMS retro backup capability. Perform 11
experiments.
Launch:
June 3, 1965 10:15:59.562 am.
Orbit:
Altitude: 296.1 km (159.9nm)
Inclination: 32.5 degrees
Orbits: 62
Duration: 4 Days, 1 hour, 56 min, 12 seconds
Distance: km
Landing:
June 7, 1965. Landing was at 27deg 44min North and 74deg 11min West.
Landing was 81.4km from attempted landing zone.
Mission Highlights:
Gemini-4
was NASA's 1st Extra Vehicular Activity (EVA) operation. EVA time
36min
All but one primary objectives were achieved. Computer controlled
reentry in the demonstration and evaluation of spacecraft systems
objective was not flown because of inadvertent alteration of computer
memory. All secondary objectives were met except one. The secondary
objective of stationkeeping and rendezvous was only partially
successful because separation and rendezvous was not attempted due to
fuel consumption.
was the second human spaceflight program of NASA, the civilian space agency of
the United States government. Project Gemini operated between Projects Mercury
and Apollo, with 10 manned flights occurring in 1965 and 1966. Its objective was
to develop techniques for advanced space travel, notably those necessary for
Project Apollo, whose objective was to land humans on the Moon. Gemini missions
included the first American spacewalks, and new orbital maneuvers including
rendezvous and docking.
After the existing Apollo program was chartered by President John F. Kennedy on
May 25, 1961 to land men on the moon, it became evident to NASA officials that a
follow-on to the Mercury program was required to develop certain spaceflight
capabilities in support of Apollo. Originally introduced on December 7 as
Mercury Mark II, it was re-christened Project Gemini on January 3, 1962. The
major objectives were:
1. To demonstrate endurance of humans and equipment to spaceflight for extended
periods, at least eight days required for a moon landing, to a maximum of two
weeks.
2. To effect rendezvous and docking with another vehicle, and to maneuver the
combined spacecraft using the propulsion system of the target vehicle.
3. To demonstrate Extra-Vehicular Activity (EVA), or space-"walks" outside the
protection of the spacecraft, and to evaluate the astronauts' ability to perform
tasks there.
4. To perfect techniques of atmospheric reentry and landing at a pre-selected
location.
5. To provide the astronauts with zero-gravity and rendezvous and docking
experience required for Apollo.
Gemini's primary difference from Mercury was that the earlier spacecraft had all
systems other than the reentry rockets situated within the capsule, to which
access of nearly all was through the astronaut's hatchway. In contrast, Gemini
housed power, propulsion, and life support systems in a detachable Equipment
Module located behind the Reentry Module, which made it similar to the Apollo
Command / Service module design. Many components in the capsule itself were
reachable through their own small access doors.
The original intention was for Gemini to land on solid ground instead of at sea,
using a paraglider rather than a parachute, with the crew seated upright
controlling the forward motion of the craft. To facilitate this, the paraglider
did not attach just to the nose of the craft, but to an additional attachment
point for balance near the heat shield. This cord was covered by a strip of
metal which ran between the twin hatches. However, this design was ultimately
dropped and parachutes were used in a conventional nose-up sea landing.
Early short-duration missions had their electrical power supplied by batteries;
later endurance missions used the first fuel cells in manned spacecraft.
The "Gemini" designation comes from the fact that each spacecraft held two
people, as "gemini" in Latin means "twins". Gemini is also the name of the third
constellation of the Zodiac and its twin stars, Castor and Pollux.
Unlike Mercury, which could only change its orientation in space, the Gemini
spacecraft could translate in all six directions, and alter its orbit. It was
designed to dock with the Agena Target Vehicle, which had its own large rocket
engine which was used to perform large orbital changes.
Gemini was the first American manned spacecraft to include an onboard computer,
the Gemini Guidance Computer, to facilitate management and control of mission
maneuvers. It was also unlike other NASA craft in that it used ejection seats,
in-flight radar and an artificial horizon - devices borrowed from the aviation
industry. Using ejection seats to push astronauts to safety was first employed
by the Soviet Union in the Vostok craft manned by cosmonaut Yuri Gagarin.
The Gemini program cost $5.4 billion.
Missions
There were 12 Gemini flights, including two unmanned flight tests. All were
launched byTitan
IIrockets.
First week-long flight; first use of fuel cells for
electrical power; evaluated guidance and navigation system for future
rendezvous missions. Completed 120 orbits.
When the original Gemini VI mission was scrubbed because its
Agena target for rendezvous and docking failed, Gemini VII was used for the
rendezvous instead. Primary objective was to determine whether humans could
live in space for 14 days.
Accomplished first docking with another space vehicle, an
unmanned Agena stage. While docked, a Gemini spacecraft thruster malfunction
caused near-fatal tumbling of the craft, which, after undocking, Armstrong
was able to overcome; the crew effected the first emergency landing of a
manned U.S. space mission.
Rescheduled from May to rendezvous and dock with augmented
target docking adapter (ATDA) after original Agena target vehicle failed to
orbit. ATDA shroud did not completely separate, making docking impossible.
Three different types of rendezvous, two hours of EVA, and 44 orbits were
completed.
First use of Agena target vehicle's propulsion systems.
Spacecraft also rendezvoused with Gemini VIII target vehicle. Collins had 49
minutes of EVA standing in the hatch and 39 minutes of EVA to retrieve
experiment from Agena stage. 43 orbits completed.
Gemini record altitude, 1,189.3 km (739.2 mi) reached using
Agena propulsion system after first orbit rendezvous and docking. Gordon
made 33-minute EVA and two-hour standup EVA. 44 orbits.
Final Gemini flight. Rendezvoused and docked manually with
its target Agena and kept station with it during EVA. Aldrin set an EVA
record of 5 hours 30 minutes for one space walk and two stand-up exercises,
and demonstrated improvements to previous EVA problems.
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