Newsletter - 29 July 1992

This is another update concerning the current status of instruments
at CFHT.  Comments and suggestions about the newsletter may be
emailed to newsletter@cfht.hawaii.edu or newsletter@uhcfht.bitnet
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PARTIAL COMMISSIONING OF THE MOS/SIS SPECTROGRAPH

Based on the excellent behaviour of the MOS spectrograph as tested 
on the sky, we will be offering this new instrument to observers with 
allocated MARLIN time starting in August (92II). Technical information 
has been provided in the Information Bulletin No. 27 (92II).  Please 
refer to this document for observing requests preparation.  For any 
additional information, please contact lefevre@uhcfht (BITNET) or 
lefevre@cfht.hawaii.edu (INTERNET).

At this time, we cannot be certain that the active tip/tilt correction
provided by the SIS mirror will be fully operational by the start of 
93I. The guiding of SIS in the active mode is currently possible only 
for guide stars with m<14; a complete rework of the SIS guide optics 
and PMTs is under way to allow active guiding for m<19.  Observing 
requests for SIS in imaging mode with active correction should instead 
ask for HRCAM. Observing requests for SIS in spectrographic mode with 
active correction should either have a guide star with m<14 at <3 arcmin 
from the target, or, in case the guiding system upgrade is not completed, 
have a backup program feasible with SIS without active correction, or 
with MOS.

The Fabry-Perot mode has also been successfuly tested and will be offered 
to observers assigned PALILA time starting in August 92II. We encourage
proposals for this mode for 93I.

Olivier LeFevre

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