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ASA AZ1750 Telescope System
ASA AZ1750 Telescope System

ASA 1.75-Meter Telescope

Starting at $2,619,000

The ASA 1.75-Meter Telescope is a complete Alt-Az observatory telescope system with a 1.75-meter Ritchey-Chrétien low expansion quartz primary mirror that guarantees diffraction-limited performance and ultra low micro-roughness values even under the most perfect Earth-based astronomical seeing conditions.

  • A fast focal ratio offers less obstruction, higher contrast, and a more compact system.
  • Nasmyth design that comes standard with 2 ports on the fork arms and configurable to 4 ports.
  • Secondary mirror focusing unit is equipped with an absolute encoder.
  • Direct drive motors and ultra high-resolution encoders on each axis for zero backlash and zero periodic error.

ASA 1.75-Meter Telescope

Starting at $2,619,000

ASA AZ1750 Telescope System
ASA AZ1750 Telescope System

The ASA 1.75-Meter Telescope is a complete Alt-Az observatory telescope system with a 1.75-meter Ritchey-Chrétien low expansion quartz primary mirror that guarantees diffraction-limited performance and ultra low micro-roughness values even under the most perfect Earth-based astronomical seeing conditions.

  • A fast focal ratio offers less obstruction, higher contrast, and a more compact system.
  • Nasmyth design that comes standard with 2 ports on the fork arms and configurable to 4 ports.
  • Secondary mirror focusing unit is equipped with an absolute encoder.
  • Direct drive motors and ultra high-resolution encoders on each axis for zero backlash and zero periodic error.

The ASA 1.75-Meter Telescope is a complete Alt-Az observatory telescope system with a 1.75-meter Ritchey-Chrétien low expansion quartz primary mirror that guarantees diffraction-limited performance and ultra low micro-roughness values even under the most perfect Earth-based astronomical seeing conditions.

  • Optical Design: Ritchey-Chrétien (RC)
  • Linear Central Obstruction: 42%
  • Focus Position: Nasmyth; 2 as standard; 4 as option
  • Focal Length: 10,500 mm
  • Focal Ratio System: f/6
  • Clear Aperture / Focal Ratio Primary Mirror: 1,750 mm (68.9 inch) / f/2
  • Image Field: 150 mm (0.82 degrees)
  • Mirror Material: Zerodur
  • Surface Quality: >94 Strehl
  • Micro-roughness: 1nm RMS / <0.7nm Ra
  • Coating: Al+SiO2 >91%
  • Back Focus from Flange: 360 mm
  • Tube Weight: 6,500 kg (14,330 lb.)
  • Software: ASA API (application programming interface) available Autumn 2023. ASA Software (Autoslew, Sequence-windows based) with ASCOM-Alpaca.
  • Pointing Accuracy (20° to 85°): <8” RMS with pointing model
  • Tracking Accuracy (20° to 85°): <0.25” RMS within 5 minutes tracking time over 5 min 0,05” RMS/min
  • System Natural Frequency: 10 Hz or greater

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