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
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