ACE Weekly 06/01/2007 - 06/07/2007

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver is
scheduled for Friday, 06/08/2007.  Station-keeping maneuver #44 is scheduled
for Thursday, 06/21/2007.

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OCRs:

None

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Activities:

RIONET - Testing on String 2 with the new ROBOTT installation continues.
Configuration issues are being discovered and resolved.  A network freeze is
in effect for the upcoming shuttle mission.  After the network freeze, the
data flow to ASC and NOAA will transition to from the Closed IONet fanout to
the Restricted IONet GMUG.

Space Link Extension (SLE) - ACE SLE version 2.1 was delivered to the
Library on April 28, 2006.  Installation in the ACE MOC will not occur until
after the MOC is converted to the RIONET.

DSN/SPS/FDF - FDF is evaluating their ephemeris generation in response to
the ongoing SPS problems with pass numbers and viewperiods.  This impacts
the ACE, SOHO, WIND and POLAR missions.  The impact to ACE occurs more often
since ACE has the shortest ephemeris files (59-day).  The FDF evaluation is
expected within the next few weeks.

Planning continues for integrating ACE operations into a multi-mission ops
center (MMOC).

Upgrades of the MOC PCs will be performed in the upcoming week for IT
Security compliance.

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Anomalies:

DOY 156  06/05/2007  S-ACE-0189  G07-0046  AC2PC1 Account Lost
AC2PC1 is used for attitude maneuver planning.  The acefdf account settings
and desktop files were deleted when the account is logged off.  The
userenv.log contains error messages concerning the DeleteProfile error.  The
SysAdmins have backed up the computer and are troubleshooting the problem as
time is available.  Unknown if this is a hardware or software issue.
IMPACT:  The ongoing process improvement since the attitude transition has
consolidated files on the PC so that no critical files were lost.  However,
ACE has never had a redundant system for attitude maneuver planning.

DOY 157  06/06/2007  S-ACE-0190  G07-0047  AC2FE1A Display Failure
The ground system string 2 front-end display failed.  Hardware maintenance
replaced the display and several reboots of the front-end were required to
restore the workstation.
IMPACT:  Issues with string 2 are impeding the testing and configuring the
transition to the Restricted IONet.

DOY 158  06/07/2007  S-ACE-0191  G07-0048  DSS-27 Outage
At 1700z, DSS-27 ground antenna stopped tracking.  This is attributed to a
station switch from commercial power to generator power.  TLM and CMD was
re-established at 1702z.  At 1800z, TLM and CMD was again lost and restored
at 1818z.
IMPACT:  A 20 minute redump of data will be performed on DOY 159 to capture
missing playback data.