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| Solid-State Star Tracker Size Limitations |
| DTO 847 |
| Overview |
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The objective of this DTO is to characterize the performance of the orbiter's solid-state star tracker with a large and bright target-the International Space Station. Laboratory tests show that the SSST can track significantly larger and brighter objects than the orbiter's other star tracker-the image-dissecting tracker. Since the ISS will reach a size very early in the assembly sequence that could prohibit IDT operations under certain conditions, it may be necessary to use the SSST to track the space station during orbiter passes. At a minimum, the SSST should be verified to accurately track ISS up to 22.6 arcminutes, which is the largest size tested in the lab and the number that was used in analyzing potential problems because of the size of the ISS. If possible, the absolute upper limit in the size of an object that the SSST can track will be determined. This DTO will be performed when the orbiter separates from the ISS but only if specific lighting conditions exist. This is the first of three planned flights. |
Editorial/Technical Comments: ShuttlePresskit
