The Jacobus Kapteyn Telescope (JKT) has a parabolic primary mirror of
diameter 1.0 m with two interchangeable secondaries. It is equatorially
mounted, on a cross-axis mount, which allows operation east or west of the
pier. Normally it is East of the pier, if operation West of the pier is
required the user should contact the telescope manager in advance to ensure
that the appropriate pointing model is in place.
There is a choice of two secondary mirrors.
The f/8.06 Harmer-Wynne system uses a spherical secondary and a
doublet corrector to give a field of 90 arcmin diameter for photographic
astrometry over a wide field. The other secondary is a hyperboloid,
which gives a
conventional f/15 Cassegrain focus. The telescope is shown in Figure
.
The JKT is normally operated by the observer. Further details of the telescope and its control system are given in the ``Jacobus Kapteyn Telescope User Guide''.
[ TIFF ]
Figure: Schematic views of the JKT. (a) From
the north (b) From the west