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It is important to note that the offsets in all templates are offsets on sky as in other Paranal
instruments. They are computed as follows:
“offset RA= (delta RA)xcos(DEC), and offset DEC= delta DEC”.
It is also important to take into account the proper motions of the objects.
7.1.3 Acquisition templates
Slit acquisition templates
We encourage the users to select the filter in which the target is best visible. We also advice
to set the shortest possible acquisition exposure time (see Section 2.2.1.4). This would allow
a minimum acquisition overhead.
Table 18: User defined and fixed keywords for XSHOOTER_slt_acq.
RA differential tracking
velocity (“/s)
DEC differential tracking
velocity (“/s)
Slit position angle on Sky
9999. for parallactic angle
u’, g’, r’, i’, z’, U,
B, V, R, I
CATALOGUE,
SETUPFILE,
NONE
Telescope guide star
selection mode
Window size for AFC
Cross Correlation
Maximum distance for
AFC Cross Correlation
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