[fitswcs] RADESYS = 'GAPPT'

[patrick.wallace at stfc.ac.uk]

Rob Seaman wrote:

> For other instrumentation such as multi-object spectrographs, the
> notion of telescope pointing is quite a bit different.  What does
> it mean for a bench spectrograph to be "on-target"?

That the light illuminating the chosen piece(s) of slit is emanating
from the desired celestial coordinates.  In practical terms, there
will probably be an array of fibres in the focal plane, and "on-
target" means that the sky is being imaged onto the array as
intended.

Patrick Wallace
____________________________________________________________________
Space Science & Technology Department                +44-1235-531198
STFC Rutherford Appleton Laboratory
Harwell Oxford
Didcot, Oxfordshire, OX11 0QX, UK         Patrick.Wallace at stfc.ac.uk
____________________________________________________________________



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