The 1.3-m Reflector

1.3-m Telescope

This is the newest telescope at the Flagstaff Station, completed in the late summer of 1999. The telescope is a modified Ritchey-Chretien optical design with a corrector lens designed to produce a very large well-corrected field 1.3-degees in diameter. A large-format mosaic CCD camera incorporating a 2x3 mosaic of 2048x4096 SITE CCDs is being built to take advantage of this design, and offer wide-field imaging with exellent astrometric properties. The telescope will be operated completely automatically.

Telescope Data

  • Construction
    • Optics: Corning Glass Works (blanks); Kodak (optical figuring)
    • Mounting: DFM Engineering, Inc.
    • Date Completed: 1998
    • Cost: $800,000
  • Optical Design: Modified Ritchey-Chretien
  • Effective Focal Length: 5.2-meters
  • Overall Focal Ratio: f/4
  • Focal Plane Scale: 39.6 arcsec/mm
  • Primary Mirror
    • Diameter: 1.3-meters (51-inches)
    • Material: Ultra-Low-Expansion (ULE) Glass
    • Weight:
    • Figure: Concave Hyperboloid
    • Focal Ratio: f/2.4
  • Secondary Mirror
    • Diameter: 0.61-meter (24-inches)
    • Material: ULE Glass
    • Weight:
    • Figure: Convex Hyperboloid
  • Total Weight (Optics, Tube and Mount):


  • 2x3 2048x4096 Mosaic CCD Camera (under construction - presently operating with single-chip camera)