ACE Weekly 11/05/04 - 11/11/04 All ACE spacecraft subsystems are performing nominally. An attitude maneuver was successfully executed on 11/05/04. The next attitude maneuver is scheduled for 11/22/04. ============================================================================ Orbit Events: Next SEZ transit will run from 11/14/04 to 12/09/04. - Minimum SEV angle of approximately 0.83 deg. Minimum SEV angles of 2005 transits will be greater with each event. ===================================================================== OCRs Executed: None ===================================================================== Ongoing Activities: TAPS: - TAPS Release 4.3 was installed on the Prime System on 10/13/04. -- FOT regression testing is in progress. --- No problems to report. ---------------------------------------------------------------------------- Automation (ROBOTT): - ROBOTTv0.9 delivered to String 1 on 09/27/03 (OCR GND_145). -- Performing operations in "Auto" mode on String 1. -- 13 DR fixes in this release. --- 12 DRs have been verified by the FOT to date. --- The last DR to be verified will require ROBOTT to be observed over a period of time to ensure no reoccurrence of the problem. -- 13 DRs have been written against this release. - Lights-out testing of the ROBOTT system without immediate FOT intervention continues. - Lights-out weekend operations start 11/13/04. ============================================================================ Extra Spacecraft Activities: DOY 04312 (11/07/04) - S3DPU and SWICS limit violations occurred throughout the pass. The FOT analyzed the data, ensuring the limit violations were brief spikes due to increased instrument processing of an ongoing solar event. The appropriate instrument teams were notified. ===================================================================== Anomalies: DOY 04311 (11/06/04) ACE Anomaly G04-0131 - GDS 26m (DSS-16) Power Supply Problem At 1530 Ops Chief called to inform FOT of problems with DSS-16 power amplifier. DSS-16 unable to support. The station was released to allow for troubleshooting. Extra time was requested in the event the problem was corrected before the end of the scheduled pass. Automation manually paused. At 1700 DSS-16 declared green and getting ready to support ACE. Automation pass times adjusted by FOT and all scheduled activities completed successfully. IMPACT: Delay of pass activities (2hr 38min). All pass objectives met because FOT intervened. Lights-out operations would have resulted in 19.5 hours data loss. DR# G104955 DOY 04312 (11/07/04) ACE Anomaly S04-0012 - SWICS Yellow Limit Violation (SSCPAP5V) SSCPAP5V violated the yellow low limit of 4.25 twice during the pass. Jim Raines notified. IMPACT: Unknown. Increased solar activity occurring at the time of violations. DOY 04312 (11/07/04) ACE Anomaly S04-0013 - S3DPU Red Limit Violation (S3DPU_CONV_SEC_I ) S3DPU_CONV_SEC_I violated the red high limit of 440 five times during the pass. Mark Popecki notified. IMPACT: Unknown. Increased solar activity occurring at the time of violations. DOY 04314 (11/09/04) ACE Anomaly S04-0014 - SWICS Yellow Limit Violation (SSCPAP5V) SSCPAP5V violated the yellow low limit of 4.25 four times during the pass. Jim Raines notified. IMPACT: Unknown. Increased solar activity occurring at the time of violations. DOY 04315 (11/10/04) ACE Anomaly G04-0132 - ROBOTT - Incorrect Flagging of Telemetry Outage At 18:57:07, telemetry dropped out from DSS-27 (8 minutes before EOT). Telemetry resumed at 18:58:38. However, ROBOTT sent out a page stating the telemetry outage was only 46 seconds. The brief telemetry outage occurred when a technician at the site disconnected the wrong cable while repairing a damaged fiber cable (Ref. DR#G104959). CDSID#21073 was previously submitted and should solve the time discrepancy problem. C&C will start using the telemetry data mark static messages when flagging the outages. IMPACT: Loss of data from 18:57:07 - 18:58:38 (1 min. 31 secs.) Real-time data recovered from SSR playback. CDSID21073, DR# G104961 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~