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Author: WikiMatrix

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English[en]
Its three Fine Guidance Sensors (FGS) are primarily used to keep the telescope accurately pointed during an observation, but can also be used to carry out extremely accurate astrometry; measurements accurate to within 0.0003 arcseconds have been achieved.
Korean[ko]
평상시에 정밀유도센서 (FGS) 세 개가 관측할 때 망원경을 정밀하게 조준하기 위해 사용되지만, 0.0003 초 이하의 정밀도를 달성할 수 있기 때문에 극도로 정밀한 천체측지에 쓰이기도 했다.

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