We have improved the control and driving system of 16' reflector at Kwanak Observatory at Seoul National University, by completing encoder unit, and by developing programs for correction of errors resulting from hardware defects. The hardware defects of this telescope system are the large backlash and the nonuniform tracking and pointing. The telescope pointing accuracy for RA is improved to a few arc minutes, and that for DEC is several tens of arc minutes. The guiding error is improved to 0.7 arcsec/minute, allowing up to 3 minutes exposure for CCD imaging under typical seeing conditions at the Observatory.

• 정웅섭(서울대학교 천문학과) | JEONG WOONGSEOB
• 이상각(서울대학교 천문학과) | LEE SANG-GAK
• 박수종(서울대학교 천문학과) | PARK SOOJONG