Summary of mechanical performance

• Telescope limits:

  Zenith distance < 84
  -6 h < hour angle < +18 h (telescope East of pier)
  -18 h < hour angle < +6 h (telescope West of pier)
  

  There are no explicit declination limits.

  The fully-lowered windshield which sits on the dome lintel sets a further limit. Because of the asymmetry of the telescope, the limits are different east and west of the pier (see La Palma Technical Note 28).

  Figure shows the area of sky accessible to the JKT.

    
  [ TIFF ]
  
  Figure: The area of sky accessible to the JKT. Lines of constant zenith distance are drawn on a plot of declination against hour angle. The horizon and hour-angle limits are shown for the two possible cases: (a) Telescope west of the pier (b) Telescope east of the pier
  

• Speed limits: Hour angle and declination: 1.0 s; Dome rotation: 1.5 s.

• Tracking and pointing:

  Pointing accuracy: rms residual of a global fit < 15 arcsec
  Tracking accuracy:
  (unguided) < 1 arcsec in 3 minutes; < 3 arcsec in 10 minutes
  (guided) < 0.3 arcsec
  Rotator positioning: < 0.2 arcsec over the whole field
  Offsetting accuracy: < 0.3 arcsec over 10 arcmin