place Location

latitude 26°41'43.8" N
Longitude 100°01'51.6" E

Gao Mei Gu Observatory located in the Gao Mei Gu City, Lijiang District , Yunnan Province, China. It's located to the northwest of Yunnan Province. Stay away from Kunming about 200 kilometers. Gao Mei Gu Observatory located on a high mountain from sea level is 3193 meters seeing was very good. A clear night sky on average more than 250 nights a year, especially suitable for astronomical observations.

devices Instruments

0.7m CDK700 Telescope System

  • Pinpoint stars out to a 70mm image circle
  • Dual Nasmyth focus, allowing simultaneous mounting of two instruments or easy switching between visual and imaging use
  • Direct-drive motors on each axis for smooth, fast, and virtually silent movement of the telescope
  • High resolution encoders on each axis for precise positioning
  • Zero backlash
  • Zero periodic error
  • PointXP mount modeling software
  • Field de-rotator / rotational field framing
Optical Design Corrected Dall-Kirkham (CDK)
Aperture 700 mm (27.56 inch)
Focal Length 4540 mm
Focal ratio 6.5
Central Obstruction 47% of the Primary Mirror Diameter
Back Focus 305 mm (12 inch) from Mounting Surface
Weight 1,200 lbs
Optical Tube Dual truss structure with Nasmyth focus
Optical Performance 1.8 micron RMS spots [25mm on-axis] (400 to 900nm) 4.4 micron RMS spots [21mm off-axis] (400 to 900nm) 6.8 micron RMS spots [35mm off-axis] (400 to 900nm) Spot Diagram  
Dimensions 93.73" H x 43.25" W x 39" D    
Optimal Field of View 70 mm (0.86 degrees) / 51.6 arcminute
Focus Position Nasmyth Focus
Fully Baffled Field 60 mm
Image Scale 22 microns per arcsecond

CCD Camera

PlaneWave is an authorized dealer for Finger Lake Instruments Cameras and can provide all the most popular cameras including the ProLine Series.

ProLine sets the standards in key performance areas that include: Download Speeds, Cooling, Low Noise Operation, Anti-Ghosting Technology, Image Quality, and Linearity. ProLine download speeds are fast while maintaining low-noise frame quality. ProLine achieves outstanding cooling without water assist. Simply set the ProLine cooling where you want it and the camera will do the rest – quickly and without worries. ProLine frame quality is second to none thanks to careful design, implementation and setup. All cameras are assembled in our clean room under exacting conditions and must pass a battery of tests before being shipped.

Andor DW432 CCD Camera

Andor’s DW432 is designed with scientific imaging in mind. The 2048 x 2048 array and 13.5 μm pixel pitch combine to deliver a 27.6 x 27.6 mm active image area, TE cooled down to -55°C. The DW432 offers outstanding resolution, field of view, sensitivity and dynamic range performance.

Active Pixels 2048 x 2048 
Sensor Size 27.6 x 27.6 mm 
Pixel Size 13.5 μm x 13.5 μm 
Field Of View 0.597 asec/Pix 1222 x 1222 asec
Max. Readout Rate 5 MHz 
Read Noise As low as 2.9 e- 
Maximum Cooling -55 °C
Frame Rate Up to 0.95 fps
Filter Wheel FLI CFW-5-7



FLI color filter wheels are used worldwide. A recent application is SOFIA - Stratospheric Observatory for Infrared Astronomy (along with the ProLine camera and Precision Digital Focuser). FLI color filter wheels have also been used for mine monitoring operations in Angola, microscopy research labs as well as dental research. Of course professional and amateur astronomers around the world use them as well

  • Longest Dimension: 9.300" - Body Thickness (minus motor): .7850"
  • Camera Coupling Pocket: 2.930" - Telescope Coupling: 3.005" - 24 UNS-2B
  • Filter Cup: 2.00" wide by 2.00" long by .116" (2.95mm) depth
  • Internal Wheel Material: CNC Machined Aluminum
  • Path Increase: .505"
  • Power Supply Output: 12VDC, 1000 mA - PC Interface: USB
  • Filter Positions: 7 - Recommended Diameter 50mm - Thickness Range 3mm - 5mm
  • Number of Internal Filter Wheels: One - Software Controlled

Filter Available : U,B,V,R,I