ACE Weekly 05/28/04 - 06/03/04

All ACE spacecraft subsystems are performing nominally.  No maneuvers were 
executed this reporting period.  The next attitude maneuver is scheduled 
for 06/11/04.

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Orbit Events:

The ACE transit of the old Solar Exclusion Zone (SEZ) will continue through 
06/14/04. For the first time ever, ACE transited the solar disk on 
06/01/04. On that date, the Sun's angular radius was 0.2629 degrees (as 
seen from Earth's center). The solar transit lasted nearly 21 hours (again, 
as seen from Earth's center). The main features of this transit are given 
in the following table (times are UTC).

5/19    01:42   4.75 deg inbound
5/27    07:45   2.0 deg inbound
5/30    23:39   0.63 deg inbound
6/01    01:18   0.2629 deg (kissing solar disk inbound)
6/01    10:46   0.197 deg (radius of closest approach to solar center)
6/01    22:14   0.2629 deg (kissing solar disk outbound)
6/02    23:28   0.63 deg outbound
6/06    11:15   2.0 deg outbound
6/14    07:18   4.75 deg outbound

The 0.63 deg epochs are included because that radius represents the closest 
approach during our last transit in February/March. ACE will spend almost 
exactly 3 days within this zone.

=====================================================================
OCRs Executed:

NONE

=====================================================================
Ongoing Activities:

TAPS:
- Transition from GTAS to TAPS occurred on 03/18/04. All trending 
activities are being accomplished using TAPS.
- Installation of TAPS release 4.3 is tentatively scheduled for the first 
week of July 2004.  All open DRs will be fixed in this release.

----------------------------------------------------------------------------
Automation (ROBOTT):

- Release 0.6 was installed on String 1 on 05/13/04.
   -- 22 DRs are OPEN.
   -- Release 0.6 will not be used operationally, however testing will 
continue on String 2 until Release 0.7 is delivered on 06/17/04.
- SUG development is ongoing.  A DRAFT version has been delivered and is 
still being reviewed by the FOT.  Comments will be provided to the developer.
- FOT training on ROBOTT began 05/05/04 and additional sessions are being 
developed.

============================================================================
Extra Spacecraft Activities:

NONE

=====================================================================
Anomalies:

DOY 04152 (05/31/04)  ACE Anomaly G04-0046 - AC2WS1 Failure
AC2WS1 rebooted on DOY 152 between 0000z and 1200z and was in an error 
state.  TSMs notified and a troubleticket was opened.  IMPACT:  Operations 
had to be switched back to String 1.   TT#2004050001

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Glen A. Miller
ACE Flight Operations Observatory Engineer
Honeywell Technology Solutions Inc.
Goddard Space Flight Center
Building 14, Room W10A
Mail Stop 428.2
Greenbelt, MD 20771

Office: 301-286-7071
Pager: 800-425-3174
Fax:    301-286-1729
gamiller@pop500.gsfc.nasa.gov
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~