ACE Weekly 08/23/02 - 08/29/02 All ACE spacecraft subsystems are performing nominally. An attitude maneuver was executed this week with no problems to report. The next attitude maneuver is scheduled for 08/30/02. ============================================================================ OCRs Executed: None ============================================================================ Ongoing Activity: The engineering test to determine the new HGA constraint is continuing. The current constraint is 6.0 deg., with current tests reaching 6.5 degrees. The FOT has been monitoring the Signal Strength, the MFR AGC levels, and the Signal-to-Noise Ratios(SNR). The drop in RF levels from an HGA angle of 0 deg to 6 deg has been approximately 3dB. There has been no loss of telemetry due to the increased HGA angles. Analysis is ongoing to determine new HGA angle constraint. The following HGA angles and range values are from FDF. Man Date Pre Man Post Man Earth-ACE Range 03/28/02 -4.58 deg +4.38 1408287 km 04/04/02 -4.35 +4.50 1414808 04/11/01 -5.09 +3.79 1428491 04/18/02 -5.16 +3.85 1440512 04/26/02 -5.77 +5.56 1455949 05/06/02 -5.72 +5.43 1493008 05/17/02 -5.81 +5.31 1527979 05/28/02 -4.34 +4.88 1550263 06/06/02 -2.38 +5.96 1576064 06/20/02 -6.57 -3.66 1590405 06/26/02 -6.43 +5.94 1592458 07/12/02 -6.5 +6.5 1598879 07/30/02 -6.5 +6.5 1567441 08/13/02 -5.34 +6.43 1532343 08/23/02 -3.28 +4.64 1493746 ============================================================================ TPOCC Release 5.2 String 2 Testing Status Testing on String 2 has completed. Week 35 realtime operations has been transferred to String 2 (with String 3 as backup) to further confirm its operational capability. TPOCC Release 2 installation on String 1 is tentatively scheduled for September 4th. ============================================================================ Anomalies: DOY 02239 (08/16/2002) ACE Anomaly #G02-0101 INIF Fanout Crash At approximately 1320z, the fanouts crashed and connections were lost with ISIS. IPNOCC was notified of the situation. The fanouts were rebooted at approximately 1345z. The INIF software was then recycled. Impact: NONE ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Glen A. Miller Honeywell Technology Solutions Inc. ACE Flight Operations Team Goddard Space Flight Center Building 14, Room W10A Mail Stop 428.2 Greenbelt, MD 20771 Office: 301-286-7071 Fax: 301-286-1729 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~