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Date: Sun, 12 Sep 2010 09:20:45 -0400
From: Kenneth Sembach
Subject: HST Status - Sunday, September 12, 2010


Good morning.

Thursday evening HST experienced an electronic upset in its Science
Instrument
Control and Data Handling Unit (SI C&DH). This is the device that
contains
the payload computer as well as the electronics necessary for
formatting the
science data and communicating with the science instruments.

Such upsets are expected to occur occasionally. This is the first
one seen
in almost a year, and only the fourth since SM4. The last event
occurred in
November 2009, so we have been rather fortunate. This event
appeared to
be very similar to previous upsets in the Control Unit / Science Data
Formatter
section of the SI C&DH. SI C&DH control was restored quickly through
standard procedures that are now in place for such events.

All of the science instruments were placed in a safe configuration
following
the upset, and an intercept science schedule was prepared by our
operations
team here at STScI. That observing timeline was uploaded to the
observatory
yesterday,and HST resumed science late last night,.

Everyone involved in the recovery efforts here and at Goddard did a
great
job of getting HST back to science quickly. Congratulations to all
involved
in keeping Hubble scientifically productive.

Hubble cheers,
Ken Sembach