CCT-20 made by DFM Engineering: Ritchey Chretien Telescope primary mirror: 500mm F/3 ( made by Zeiss) effective focal length: 4000mm F/8 spec: Field: 125mm with corrector optics ST8 SBIG CCD 冷凍照相機 piggyback: 7" (178mm) ED APO BMC Meade 折射望遠鏡, ZWO ASI071 CCD Camera 4" 尋星鏡 Mount: Equatorial fork type 760mm (30 in) friction drive in RA and 710mm(28 in) friction drive in DEC ASH-Dome Telescope Control System: Skyx 6 2023年 11月4日 木星opposition 天文觀測站是建築在一條15m高的三合土鋼筋圓柱墩上，深入地下7.5m，結構上跟大樓獨立，以提供一個非常穩固, 吸震(seismic isolation)地基。 13 Feb 2026: 退役 Reference ho koon DFM Engineering hkastroforum ASH-Dome YouTube