Gemini Observatory (IAU - O42)

• Bortle: 1~2
• SQM: avg=21.5, peak=21.8
• Seeing: avg.=~0.8~1.2”, peak=0.36”
• Annual Clear dark nights : ~220d
• Avg. Windspeed : 1.65m/s
• Visible Distance : 150km(93miles)
• 50 Telescopes On-Site Currently
• Maximum Diameter : 20”(0.5m) iDK
• Internet : High-speed Fiber, 1 Gbps
• Monitor : All-Sky Camera, Cloud Sensor etc.
• Onsite Support : 7x24
• Power Backup: UPS Generator

Our Gemini Observatory is located in the suburbs of Lijiang City, Yunnan Province, China, adjacent to the Yunnan Astronomical Observatory of the Chinese Academy of Sciences, where a 2.6-meter optical telescope is operated for scientific research. This proximity means our observatory’s observing conditions have undergone rigorous scientific scrutiny. Perched at an altitude of 3,170 meters, the Gemini Observatory boasts exceptional air clarity, with a daytime visual range exceeding 150 kilometers. Its high altitude ensures minimal dust interference, providing a seeing of less than 1” and a peak dark sky measure of 21.8 SQM. With over 220 clear days annually, it’s been recognized one of the best astronomical observation sites in Asia.

Currently, the Gemini Observatory hosts 50 sets of astronomical telescopes, equipped with astronomical weather monitoring equipment, all-sky monitoring cameras, backup generators, gigabit fiber-optic internet access, and a dedicated team on-site for technical support.