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| ST8 Mission |
| Technology: Dependable Multiprocessor |
| Throughput density |
>300 MFLOPS/Watt |
| System availability |
>99.5% in a natural LEO radiation environment |
| Reliability (correctness of processed data) |
>99.5% in a natural LEO radiation environment |
Technology: UltraFlex 175
Scalable to large sizes, the ST8 validation model has the following characteristics: |
| Diameter: |
5.5 m |
| Power output |
7 kW |
| Power output efficiency |
28% |
| Deployed Specific Power |
175 W/Kg |
| Voltage capability |
>100 VDC |
| Power per Stowage volume |
>33 kW/m |
| Technology: SAILMAST |
| Deployed mast length |
40 meters |
| Stowed mast length |
< .5 meter |
| Stowed length / deployed length |
.88% |
| Linear mass density |
34 g/m (deployed) |
| Mast diameter |
24 cm |
| Material, longerons and battens |
Graphite composite fibers |
| Technology: Thermal Loop |
| Number of evaporators |
2 |
| Number of condensers/radiators |
2 |
| Evaporator outer diameter |
6.35 mm |
| Electrical power required for startup |
< 5W |
| Working fluid |
Anhydrous ammonia |
| Maximum heat transport capability |
75W @ 25°C operating temperature |
| Operating temperature range0- 35C |
0 – 35°C |
For Further Information:
Dependable Multiprocessor:
Raphael R. Some and David C. Ngo: "REE: A COTS-based Fault Tolerant Parallel Processing Supercomputer for Spacecraft Onboard Scientific Data Analysis," IEEE, 1999. JPL CL#99-1423.
John R. Samson, Jr., et al: "High Performance, Dependable Multiprocessor," IEEE, 2006.
John R. Samson, Jr., et al.: "Technology Validation: NMP ST* Dependable Multiprocessor Project," IEEE, 2006.
UltraFlex 175:
Brian Spence et al.: "Next Generation UltraFlex Solar Array for NASA's New Millennium Program Space Technology 8," IEEE, 2005.
Brian Spence et al.: "Next Generation Ultraflex (NGU) Technology Maturation for NASA's New Millennium Program (NMP) Space Technology 8 (ST8)," IEEE, 2005.
SAILMAST:
Michael E. McEachen, Thomas A. Trautt and David M. Murphy: "The ST8 SAILMAST Validation Experiment," AIAA 2005-1884.
Thermal Loop:
Jentung Ku:"Operating Characteristics of Loop Heat Pipes," Society of Automotive Engineers, Inc., 29th International Conference on Environmental Systems, July 12-15, 1999, Denver, CO.
Jentung Ku et al.: "Miniature Loop Heat Pipe with Multiple Evaporators for Thermal Control of Small Spacecraft," Government Microcircuit Applications and Critical Technology Conference, April 4-7, 2005, Las Vegas, NV.
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