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).
[ 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
Pointing accuracy: rms residual of a global fit < 15 arcsec
(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