Instrument Host Overview
========================
 
  The Lowell Perkins 72-inch (1.83-m) telescope is one of the facilities
  of the Lowell Observatory.  The telescope is located on Anderson Mesa,
  near Flagstaff, Arizona.  The geodetic coordinates of the telescope are:
 
      Lontitude : 111d 32' 09.28'' W (248d 27' 50.72'' E)
      Latitude  : +35d 05' 48.62''
      Altitude  : 2200m
 
  Longitude and latitude are good to about +/- 0.2. The altitude is
  good to about +/- 1 meter.
 
  The location and telescope specifications given here are reproduced from
  the Lowell Observatory web site, http://www.lowell.edu.
 
 
Telescope Specifications
========================
 
  The 1.83-meter telescope is a classical Cassegrain reflector with
  the properties listed below:
 
      Primary Mirror Diameter             :  1.83m  (72.2in)
      Overall nominal f-ratio (F/#)       :  17.5
      Normal effective focal length (EFI) :  31.93m (1256.5in)
      Normal Cassegrain scale             :  6.45 arcseconds/mm
      BFI                                 :  1.30m (51.5in)
      Primary mirror f-ratio (Fp/#)       :  4.18
      Primary focal length (FLp)          :  7.635m (300.6in)
      Dsa                                 :  0.41m (16.3in)
      Is                                  :  7.22m (284.1in)
      Os                                  :  1.72m (68.0in)
      Ms                                  :  5.91m (232.6in)
      mag                                 :  4.2
      Primary conic constant (K1)         : -1.0 (paraboloid)
      Secondary conic constant (K2)       : -3.65 (hyperboloid)
 
  Notes:
 
   1) Dsa is the diameter of the axial cone at the secondary. The diameter
      of the secondary is 1 to 2 inches larger than DSA.