ACE Weekly 03/26/04 - 04/01/04

All ACE spacecraft subsystems are performing nominally. No attitude 
maneuvers were executed this reporting period. The next attitude maneuver 
is tentatively scheduled for 04/02/04.

============================================================================
Orbit Events:

 From Craig Roberts (FDF):

The next ACE transit of the old Solar Exclusion Zone (SEZ) will run from 
05/19/04 to 06/14/04.  For the first time ever, ACE will transit the solar 
disk on 06/01/04. On that date, the Sun's angular radius is 0.2629 degree 
(as seen from Earth's center). The solar transit will last 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. No problems have been noted 
to date.

----------------------------------------------------------------------------
Automation (ROBOTT):
- Testing of Release 0.5 is progressing well. This release will not be 
placed on String 1.
- Failover monitor/CRON testing began 03/19/04 with some minor problems 
identified.
- ROBOTT Release 0.6 has a target date of 04/07/04. This release will not 
include any GTAS tasks and will include any fixed DRs at that time.
- The color allocation problem with TPOCC has been corrected.

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

- Submitted a draft OCR to M. Popecki for the S3DPU Anti-Reset Patch 
activity. All loads have been built and reviewed by both M. Popecki and the 
FOT.  Uploading of the Anti-Reset patch will possibly occur within the next 
couple weeks pending completion of supporting OCRs for SEPICA, SWICS, and 
SWIMS and final NASA approval.

- The window of opportunity to execute the patch will open when we have two 
or more active regions in the Eastern hemisphere of the Sun, with at least 
one near the central
meridian. They should be producing X ray flares.

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

DOY 04092 (04/01/04) ACE Anomaly G04-0023 - MAD 26m DSS-66 - Resweep Required
When carrier was brought up, DSS-66 was not able to get lock on the 
spacecraft's Receiver B. Instructed station to resweep and Receiver B 
subsequently was able to obtain LOCK. IMPACT: Delayed pass activities 
approximately 5 minutes.  DR# M102401

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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
Email: gamiller@pop500.gsfc.nasa.gov
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~