Subject: 3.5m shutdown extended through 9/18-19

From: elt@astro.Princeton.EDU

Submitted: Mon, 13 Sep 1999 16:02:14 -0400 (EDT)

Message number: 376 (previous: 375, next: 377 up: Index)

Unfortunately, the first attempt to aluminize the new secondary
for the 3.5-meter produced an unsatisfactory coating with poor
reflectivity and areas of very large scattered light.  Thus, it will
be necessary to make a second attempt to aluminze it in the tank
at Sunspot-NSO.  Therefore, the start of science operations will
be delayed for several more days.

In particular, science operations will not begin before the night of
19 September, and the night of the 20th is more likely, even assuming
cooperative skies during the on-sky recommissioning process.  Affected
programs include PU02, PU01, UW02, UW06, NM08, DD01, UC01, UC08, WS01
and JH02.  (All six ARC institutions and DDT lose time as it turns out.)

I am attempting to copy this message directly to the affected PIs and
observers for each program but institutional schedulers and UC members
are asked to help in making sure that everyone is informed in a timely
manner.

Those responsible for the science programs scheduled for Sept. 19th
(PU02, JH02 and PU01) will be informed later in the week as to the
disposition of that night.

Ed Turner

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