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The AMCS is specified to a pointing accuracy of 1', i.e., with
`` 
'' confidence the distance between the actual pointing
direction and the requested position will be less than 1'.
The pointing stability, i.e., the movement of the optical axis of
the XRT while on target, is less than 5'' per second,
with a jitter radius of 
.
PSPC observations will be carried out in a special ``wobble'' mode
(for details see § 4.2.2; 
and 10.6)
which slowly moves the telescope's
pointing direction back and forth ( 
in 400 seconds of time)
in order to prevent unwanted shadowing of X-ray sources behind
opaque structures in the PSPC. A similar ``wobble'' is performed for the
HRI ( 
in 400 seconds of time).
The ROSAT attitude determination is done post facto on ground by the German Space Operations Center (GSOC) to a specified accuracy of 6''.