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Product Name: Gemini 4

Product Description

Gemini 4 was the second crewed mission of the Gemini series and carried James McDivitt and Edward White on a 4-day, 62-orbit, 98-hr flight from June 3 to June 7, 1965. The mission included the first American spacewalk. The objective of the mission was to test the performance of the astronauts and capsule and to evaluate work procedures, schedules, and flight planning for an extended length of time in space. Secondary objectives included demonstration of extravehicular activity in space, conduct stationkeeping and rendezvous maneuvers, evaluate spacecraft systems, demonstrate the capability to make significant in-plane and out-of-plane maneuvers and use of the maneuvering system as a backup reentry system, and conduct 11 experiments. Mission Profile Gemini 4 was launched from Complex 19 at 10:15:59 a.m. EST (15:15:59.562 UT) and inserted into a 162.3 x 282.1 km Earth orbit at 10:22:05. The orbit was raised to 166 x 290 km during the first revolution to attempt a rendezvous with the second stage. This stationkeeping exercise was cancelled early in the second revolution after depletion of 42% of the fuel, it was determined that use of more fuel would jeopardize other mission objectives. White then donned special gear and pressurized his suit at 3.7 psi. McDivitt depressurized the cabin, bringing the pressure to zero at 2:33:35 p.m. EST, and the hatch was opened at 2:34. White stood up two minutes later and exited the spacecraft using a hand-held gas gun at 2:46, becoming the first American to walk in space. White was attached to the spacecraft by an 8 meter tether. The gas gun fuel supply was depleted in 3 minutes, after which White pulled on the tether and twisted his body to maneuver around the spacecraft. The extravehicular activity (EVA) lasted 23 minutes, after which White pulled himself back into the spacecraft. Difficulty was encountered sealing the hatch, but working together the astronauts finally closed it, at 3:10 p.m. EST. Cabin repressurization began at 3:12:50. Drifting flight was maintained for the next 30 hours to conserve propellant. A computer malfunction on the 48th revolution made the planned computer-controlled reentry impossible. A zero-lift ballistic reentry, similar to that used by the Mercury program, was started at the beginning of revolution 62 with retrofire at 11:56:00 a.m. EST on June 7. Gemini 4 splashed down 16 minutes later at 12:12:11 in the western Atlantic, 27.73 N, 74.18 W, 81 km from the target. Total elapsed mission time was 97:56:12. The crew were recovered by helicopter and flown to the aircraft carrier U.S.S. Wasp at 1:09 p.m. and the capsule was recovered at 2:28 p.m. The experiments performed during the mission were electrostatic charge (MSC-1), proton-electron spectrometer (MSC-2), triaxial magnetometer (MSC-3), two-color earth limb photos (MSC-4), inflight exerciser (M-3), inflight phonocardiogram (M-4), bone demineralization (M-6), synoptic terrain photos (S-5), synoptic weather photos (S-6), dim and twilight phenomena (S-28), radiation (D-8), and simple navigation (D-9). All experiemnts were performed successfully. All other objectives except the rendezvous and computer controlled reentry were achieved.