Gemini 2 5 2 X 4

1. Gemini 2 5 2 X 4 6
2. Gemini 2 5 2 X 4

The zip file download contains both the Gemini web application and the sample database to get you going.

Gemini Grinding Wheel 24 Grit Reinf T27, 4-1/2 x 1/4 x 5/8 - 11 In. 3D Model / PCB Symbol. Can ship immediately: 10. Request Lead Time; Price. Gemini a 1 2 3 prior / no b 4 5 6 area c 7 8 9 0 e f g j system ready 09/01/07 12:09 am next / yes oi234i 8/06. 2 the gem-rp1cae2 is a.

Note Please read the Migration Guide before you proceed any further. We recommend that you perform this upgrade on a test instance.

Step 1 - Backup

Please backup your existing Gemini SQL Database and Gemini web application folders before following this upgrade process. You can use SQL Management Studio to back up your database.

Please check you have everything ready for the installation process.

Step 2 - Unzip

Unzip the Gemini zip file and you should see the contents as follows:

Step 3 - Database Upgrade

Make sure that you have selected the correct database.

Open and run the following scripts in SQL Management Studio:

Once open in SQL Management Studio, execute the scripts. Gemini will automatically upgrade the database to the latest version if the SQL user has the permissions to do so.

Step 4 - Create Web Application

Copy the contents of the Gemini Web Application folder into your current web application folder (removing all existing files first):

Step 5 - Edit Web.config

Edit the new web.config file and put in the correct SQL Server user credentials for your Gemini database:

Remember to set your correct authentication settings:

Step 6 - Set Application Pool

Go to your IIS and change the previous Application Pool's .NET Framework version from 2.0 to 4.0.

Once changed your Gemini should now be upgraded to the latest release.

After installation you can navigate to the Gemini web application using your browser (e.g. http://myserver/gemini').

Step 7 - Set Folder Permissions

For complete administrative control, Gemini requires write access to the following THREE FOLDERS that is located where you installed Gemini:

• Right click App_Code folder, select Security tab, allocate Modify/ Full Control permissions to the EVERYONE group
• Right click App_Data folder, select Security tab, allocate Modify/ Full Control permissions to the EVERYONE group
• Right click Assets folder, select Security tab, allocate Modify/ Full Control permissions to the EVERYONE group

Note Please read the Migration Guide before you proceed any further. We recommend that you perform this upgrade on a test instance.

NSSDCA/COSPAR ID: 1965-043A

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.

Spacecraft and Subsystems

The Gemini spacecraft was a cone-shaped capsule consisting of two components, a reentry module and an adaptor module. The adaptor module made up the base of the spacecraft. It was a truncated cone 228.6 cm high, 304.8 cm in diameter at the base and 228.6 cm at the upper end where it attached to the base of the reentry module. The re-entry module consisted of a truncated cone which decreased in diameter from 228.6 cm at the base to 98.2 cm, topped by a short cylinder of the same diameter and then another truncated cone decreasing to a diameter of 74.6 cm at the flat top. The reentry module was 345.0 cm high, giving a total height of 573.6 cm for the Gemini spacecraft.

The adaptor module was an externally skinned, stringer framed structure, with magnesium stringers and an aluminum alloy frame. The adaptor was composed of two parts, an equipment section at the base and a retrorocket section at the top. The equipment section held fuel and propulsion systems and was isolated from the retrorocket section by a fiber-glass sandwich honeycomb blast shield. The retrorocket section held the re-entry rockets for the capsule.

The reentry module consisted mainly of the pressurized cabin which held the two Gemini astronauts. Separating the reentry module from the retrorocket section of the adaptor at its base was a curved silicone elastomer ablative heat shield. The module was composed predominantly of titanium and nickle-alloy with beryllium shingles. At the narrow top of the module was the cylindrical reentry control system section and above this the rendezvous and recovery section which holds the reentry parachutes. The cabin held two seats equipped with emergency ejection devices, instrument panels, life support equipment, and equipment stowage compartments in a total pressurized volume of about 2.25 cubic meters. Two large hatches with small windows could be opened outward, one positioned above each seat.

Control, Propulsion, and Power

Attitude control was effected by two translation-maneuver hand controllers, an attitude controller, redundant horizon sensor sytems, and reentry control electronics, with guidance provided via an inertial measuring unit and radar system. The orbital attitude and maneuver system used a hypergolic propellant combination of monomethylhydrazine and nitrogen tetroxide supplied to the engines by a helium system pressurized at 2800 psi. Two 95 lb translation thrusters and eight 23 lb attitude thrusters were mounted along the bottom rim of the adaptor, and two 79 lb and 4 95 lb thrusters were mounted at the front of the adaptor. Power was supplied by 6 silver-zinc batteries to a 22- to 30-volt DC two-wire system. During reentry and post-landing power was supplied by four 45 amp-hr silver-zinc batteries.

Communications

Gemini 2 5 2 X 4 6

Voice communications were performed at 296.9 MHz with an output power of 3 W. A backup transmitter-receiver at 15.016 MHz with an output power of 5 W was also available. Two antenna systems consisting of quarter-wave monopoles were used. Telemetry was transmitted via three systems, one for real time telemetry, one for recorder playback, and a spare. Each system was frequency-modulated with a minimum power of 2 W. Spacecraft tracking consisted of two C-band radar transponders and an acquisition-aid beacon. One transponder is mounted in the adaptor with a peak power output of 600 W to a slot antenna on the bottom of the adaptor. The other is in the reentry section, delivering 1000 W to three helical antennas mounted at 120 degree intervals just forward of the hatches. The acquisition-aid beacon was mounted on the adaptor and had a power of 250 mW.

Reentry

At the time of reentry, the spacecraft would be maneuvered to the appropriate orientation and equipment adaptor section would be detached and jettisoned, exposing the retrorocket module. The retrorockets consisted of four spherical-case polysulfide ammonium perchlorate solid-propellant motors mounted near the center of the reentry adaptor module, each with 11,070 N thrust. They would fire to initiate the spacecraft reentry into the atmosphere, with attitude being maintained by a reentry control system of 16 engines, each with 5.2 N thrust. The retrorocket module would then be jettisonned, exposing the heat shield at the base of the reentry module. Along with the ablative heat shield, thermal protection during reentry was provided by thin Rene 41 radiative shingles at the base of the module and beryllium shingles at the top. Beneath the shingles was a layer of MIN-K insulation and thermoflex blankets. At an altitude of roughly 15,000 meters the astronauts would deploy a 2.4 meter drogue chute from the rendezvous and recovery section. At 3230 meters altitude the crew releases the drogue which extracts the 5.5 meter pilot parachute. The rendezvous and recovery section is released 2.5 seconds later, deploying the 25.6 meter main ring-sail parachute which is stored in the bottom of the section. The spacecraft is then rotated from a nose-up to a 35 degree angle for water landing. At this point a recovery beacon is activated, transmitting via an HF whip antenna mounted near the front of the reentry module.

NSSDCA/COSPAR ID: 1965-043A

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.

Spacecraft and Subsystems

The Gemini spacecraft was a cone-shaped capsule consisting of two components, a reentry module and an adaptor module. The adaptor module made up the base of the spacecraft. It was a truncated cone 228.6 cm high, 304.8 cm in diameter at the base and 228.6 cm at the upper end where it attached to the base of the reentry module. The re-entry module consisted of a truncated cone which decreased in diameter from 228.6 cm at the base to 98.2 cm, topped by a short cylinder of the same diameter and then another truncated cone decreasing to a diameter of 74.6 cm at the flat top. The reentry module was 345.0 cm high, giving a total height of 573.6 cm for the Gemini spacecraft.

The adaptor module was an externally skinned, stringer framed structure, with magnesium stringers and an aluminum alloy frame. The adaptor was composed of two parts, an equipment section at the base and a retrorocket section at the top. The equipment section held fuel and propulsion systems and was isolated from the retrorocket section by a fiber-glass sandwich honeycomb blast shield. The retrorocket section held the re-entry rockets for the capsule.

The reentry module consisted mainly of the pressurized cabin which held the two Gemini astronauts. Separating the reentry module from the retrorocket section of the adaptor at its base was a curved silicone elastomer ablative heat shield. The module was composed predominantly of titanium and nickle-alloy with beryllium shingles. At the narrow top of the module was the cylindrical reentry control system section and above this the rendezvous and recovery section which holds the reentry parachutes. The cabin held two seats equipped with emergency ejection devices, instrument panels, life support equipment, and equipment stowage compartments in a total pressurized volume of about 2.25 cubic meters. Two large hatches with small windows could be opened outward, one positioned above each seat.

Control, Propulsion, and Power

Attitude control was effected by two translation-maneuver hand controllers, an attitude controller, redundant horizon sensor sytems, and reentry control electronics, with guidance provided via an inertial measuring unit and radar system. The orbital attitude and maneuver system used a hypergolic propellant combination of monomethylhydrazine and nitrogen tetroxide supplied to the engines by a helium system pressurized at 2800 psi. Two 95 lb translation thrusters and eight 23 lb attitude thrusters were mounted along the bottom rim of the adaptor, and two 79 lb and 4 95 lb thrusters were mounted at the front of the adaptor. Power was supplied by 6 silver-zinc batteries to a 22- to 30-volt DC two-wire system. During reentry and post-landing power was supplied by four 45 amp-hr silver-zinc batteries.

Communications

Gemini 2 5 2 X 4 6

Voice communications were performed at 296.9 MHz with an output power of 3 W. A backup transmitter-receiver at 15.016 MHz with an output power of 5 W was also available. Two antenna systems consisting of quarter-wave monopoles were used. Telemetry was transmitted via three systems, one for real time telemetry, one for recorder playback, and a spare. Each system was frequency-modulated with a minimum power of 2 W. Spacecraft tracking consisted of two C-band radar transponders and an acquisition-aid beacon. One transponder is mounted in the adaptor with a peak power output of 600 W to a slot antenna on the bottom of the adaptor. The other is in the reentry section, delivering 1000 W to three helical antennas mounted at 120 degree intervals just forward of the hatches. The acquisition-aid beacon was mounted on the adaptor and had a power of 250 mW.

Reentry

At the time of reentry, the spacecraft would be maneuvered to the appropriate orientation and equipment adaptor section would be detached and jettisoned, exposing the retrorocket module. The retrorockets consisted of four spherical-case polysulfide ammonium perchlorate solid-propellant motors mounted near the center of the reentry adaptor module, each with 11,070 N thrust. They would fire to initiate the spacecraft reentry into the atmosphere, with attitude being maintained by a reentry control system of 16 engines, each with 5.2 N thrust. The retrorocket module would then be jettisonned, exposing the heat shield at the base of the reentry module. Along with the ablative heat shield, thermal protection during reentry was provided by thin Rene 41 radiative shingles at the base of the module and beryllium shingles at the top. Beneath the shingles was a layer of MIN-K insulation and thermoflex blankets. At an altitude of roughly 15,000 meters the astronauts would deploy a 2.4 meter drogue chute from the rendezvous and recovery section. At 3230 meters altitude the crew releases the drogue which extracts the 5.5 meter pilot parachute. The rendezvous and recovery section is released 2.5 seconds later, deploying the 25.6 meter main ring-sail parachute which is stored in the bottom of the section. The spacecraft is then rotated from a nose-up to a 35 degree angle for water landing. At this point a recovery beacon is activated, transmitting via an HF whip antenna mounted near the front of the reentry module.

Gemini 2 5 2 X 4

Gemini Program

The Gemini program was designed as a bridge between the Mercury and Apollo programs, primarily to test equipment and mission procedures in Earth orbit and to train astronauts and ground crews for future Apollo missions. The general objectives of the program included: long duration flights in excess of of the requirements of a lunar landing mission; rendezvous and docking of two vehicles in Earth orbit; the development of operational proficiency of both flight and ground crews; the conduct of experiments in space; extravehicular operations; active control of reentry flight path to achieve a precise landing point; and onboard orbital navigation. Each Gemini mission carried two astronauts into Earth orbit for periods ranging from 5 hours to 14 days. The program consisted of 10 crewed launches, 2 uncrewed launches, and 7 target vehicles, at a total cost of approximately 1,280 million dollars.

Alternate Names

• 01390
• Gemini4

Facts in Brief

Launch Date: 1965-06-03
Launch Vehicle: Titan II
Launch Site: Cape Canaveral, United States
Mass: 3574 kg

Funding Agency

• NASA-Office of Manned Space Flight (United States)

Disciplines

• Space Physics
• Human Crew
• Earth Science

Additional Information

Questions and comments about this spacecraft can be directed to: Dr. David R. Williams

Personnel

Selected References

• Gemini midprogram conference including experimental results, NASA, SP-121, 1966. (Papers Presented at the Manned Spaceflight Center, Houston, Feb. 23-25, 1966)
• Gemini summary conference, NASA, SP-138, Wash, DC, Feb. 1967.
• Gemini-4 success to intensify launch pace, Space Technol. International, 8, No. 3, 4-8, July 1965.
• Grimwood, J. M., et al., Project Gemini technology and operations - A chronology, NASA, NASA SP-4002, Wash., DC, 1969.

Diagram of the Gemini capsule. (Courtesy of NASA History Office.)

Gemini Books Online

Gemini Home Page
Chronology of U.S. Astronaut Missions - Mercury, Gemini, and Apollo

Gemini 4 Images - Catalog of Spaceborne Imaging
More Gemini 4 Images - Kennedy Space Center
More Gemini Diagrams - NASA History Office