ACE Weekly 05/02/03 - 05/08/03 All ACE spacecraft subsystems are performing nominally. An attitude maneuver (dog-leg) was executed on 05/07/03 successfully. The next attitude maneuver is scheduled for 05/22/03. ============================================================================ Orbit Events: The next expected SEV transit is to occur: Entry: 06/01/03 at 1442Z Minimum angle: 2.18 degrees on 06/13/03 at 1618Z Exit: 06/25/03 at 1652Z ============================================================================ OCRs Executed: NONE ============================================================================ Ongoing Activities: TAPS: Trending, Analysis and Plotting System (TAPS) development continues with emphasis being placed on fixing the DRs attributed to the current release. Testing is progressing on both TAPS#1 and TAPS#2. ---------------------------------------------------------------------------- Automation (ROBOTT): Testing of the Offline and HSM systems is progressing. Testing by the Automation team for Command and Control is still paused due to testing at WIND. The first release of Command and Control to the FOT is still TBD. ---------------------------------------------------------------------------- 34m UPL Demo Passes: Two 34m UPL demo passes were conducted this week with DSN DSS-54 (05/06/03 & 05/08/03). There were no problems with DSS-54 locking onto all the bit rates. All commands sent were verified by the spacecraft. ============================================================================ Anomalies: Day 03125 (05/05/2003) - ACE Anomaly Report #G03-0036 - DSN 26m (DSS-66) - Incorrect Predicts DSS-66 failed to acquire the spacecraft at the AOS. DSS-66 did not have the current predicts. Telemetry acquisition at AOS+13 minutes. IMPACT: Delayed pass activities. All telemetry recovered during pass. DR# M101586 Day 03126 (05/06/2003) - ACE Anomaly Report #G03-0037 - TPOCC-ENIF Connection Lost At 14:27:36, DSS-54 had reaquired the spacecraft at the high data rate. However, no VC2 or VC4 data was flowing to the MOC at this time. Earlier in the pass, at 15:30:36, while running the procedure c_noop in the low data rate the forward link connection to the fanout was terminated. However, the foward link connection was re-established five seconds later. It seems as though at this time both the VS2 and command echo ports were terminated as well. However, there were no event messages to indicate this. It was also noticed that both TAPS machines had lost VS2 connections as well. Both TAPS machines were recycled to re-establish all connections. IMPACT: None. Day 03122 (05/02/2003) - ACE Anomaly Report #G03-0038 -AC2WS1 Reboot During /trend Access String 2 workstation ac2ws1 rebooted while trying to create GTAS partitions on /trend drive. Notified TSMs, opened Ticket Number 2003050001. IMPACT: None. Occurred on the backup string. Problem has been corrected. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~