From: Isobel Hook (imh@astro.ox.ac.uk)
Date: Fri Nov 01 2002 - 19:58:29 PST
Hi Greg,
Thanks for the comments.
It may be difficult to be specific about what conditions we want on which
nights (although we can certainly make our preferences known informally,
but there is no formal way to do that in the queue). We can certainly
specify different conditions for brighter and fainter targets though.
Re Nodd & Shuffle - we will observe the source in both nod positions so
the overhead is not much larger than if you offset along the slit between
exposures in the conventional way. The difference is that we will nod much
more frequently and will not read out the detector in between nids - the
more frequent nodding is what adds the 25% overhead.
So, given your comments plus Rob's point about probably not having targets
much before 5th anyway, I suggest we prepare a mix of really faint and
not-so-faint targets. For the faint ones we'll specify better IQ (~0.6?)
with nod & shuffle and for the not-so-faint ones 0.8" with no nod &
shuffle. Then we can mention that we'd like to be observing on 8th if
possible. (do we want to hold back some time for that night? It is
possible that we could have used all our 10.3 hrs before that if things go
well.)
Cheers,
Isobel.
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