| Clear Aperture | 20" (508mm) |
Optical Design
| Advanced Coma Free (ACF) |
| Optical Coatings | Ultra-High Transmission Coatings (UHTC) |
| Resolving Power (Dawes Limit) | .228 arc seconds |
| Focal Length, Focal Ratio | 4064mm, f/8 |
| Mount type | MAX Robotic Equatorial Mount |
| Gear pitch diameter | 13.625" |
| Periodic error correction | Five (5) arc seconds, both axes |
| Latitude | 0-90° |
| Number of Gear teeth | 652 (RA & DEC) |
| Control Panel | 2 multi-function, multi-port panels |
| Focusing | 4-speed front focusing mechanism |
| GPS | 16-channel GPS receiver. With North sensor. |
| Pointing Precision | High Precision Mode 5-arc min. |
| Autostar® II Hand Controller | Included (147,541 object database) |
| Alignment | Equatorial |
| North electronic sensor | Included |
| Temperature Control | Thermal stabilization fan |
| Slew Speeds | RA and Dec: 0.01x to1.0x sidereal, variable in0.01x increments;
2x, 8x, 16x, 64x, 128x sidereal; 1°/sec. to 2°/sec., variable in 0.1° increments
|
| Tracking Rates | Sidereal, lunar, or custom-selected from 2000 incremental rates |
| Primary, Secondary Mirror | Difraction limited, low-expansion borosilicate |
| Correcting Plate/Lens | High-spectral transmission Borofloat® from world-renowned Schott® AG Germany |
| Power | 12VDC, 5amp power supply required |
| Counterweights | Requires 2 - 35lb. Counterweights (included)
|
| RA Housing Assembly | 66 pounds | L = 20.75"; W = 18.85"; H = 20.34" |
| Dec Housing Assembly | 75 pounds | L = 18.25"; W = 15"; H = 20.45" |
| Counterweight Shaft Assembly | 32 pounds without counterweights | L = 38.1"; W = 1.25" |
| Portable Tripod | 81 pounds | Height: 26.5 inches; Footprint radius: 30 inches |
| Permanent Pier (optional) | 39 pounds | Minimum Height: 22"; Tube Diameter: 11.9" |
| Optical Tube Assembly (OTA) | 190 pounds | L = 40"; W = 25.7"; H = 25.7" |
| OTA + Mount + Counterweights | 694 pounds | L = 40"; W = 25.7"; H = 99.67" |
显身卡
