Elevation: 2071 m = 6795 ft.
  Latitude: +31° 57' 46.5"
  Longitude: 111° 36' 01.6"W
  Time Zone: +7 hours
  Primary Mirror Clear Aperture: 2.29 m = 90 inches diameter
  Primary Focal Ratio: f/2.66
  Typical Seeing: 1.5"
  f/9 Ritchey-Chretien focus
      Plate Scale: 104 microns/arcsec = 9.66 arcsec/mm (nominal)
      Usable Field of View: 45 arcminute diameter (curved focal plane)
      Central obscuration = 14%
  

This is a reminder that both safety goggles AND a face shield, along with cryo gloves, must be worn when filling dewars or handling liquid nitrogen in any capacity. These are provided near the dewars downstairs for the B&C and WIFIS, and upstairs on the tool board for 90Prime. Long sleeves and closed toed shoes must also be worn when handling liquid nitrogen. We have provided lab coats which are hung on the pegs by the whiteboard where fill times are written if you aren’t wearing long sleeves, but proper footware is the responsibility of the observers. Using PPE is easy, but please reach out to us if you have any questions!

What's New at the 90"

Bok 90" Lightning Shutdown - Short Version
Bok 90" Lightning Shutdown - Long Version

Fire Safety Procedure
Emergency Phone List
Snow Clearing Procedure

List of Certifiers
Bok 90" Telescope Checklist for Basic Certification
Certification Form
Required Reading

Kitt Peak NOAA Weather
Kitt Peak Clear Sky Chart
Atmospheric Sciences Arizona IR
Atmospheric Sciences Arizona Radar
All Sky Camera
Bok Weather

Recent Changes and Known Issues
How to Take Flats
Detector Information
Optics
Filters
Operation
90Prime vs 90PrimeOne
Focus
Dithered Exposure
Pointing and WCS Flexture
90Prime Documents

Presentation

Spectrograph Information
Detector Test Report

TCS Crash Recovery Procedure
Mirror Covers Won't Open or Close
Proper Way to Start or Restart the Filter Wheel GUI
Checking Power and Fibers When Using the B&C
Check the Galil Handles
Desktop Icons Gone
Limits