ACE Weekly 09/12/03 - 09/18/03 All ACE spacecraft subsystems are performing nominally. An attitude maneuver was successfully executed on 09/16/03. The next attitude maneuver is scheduled for 09/24/03. ============================================================================ Orbit Events: ACE is currently in SEV transit through 09/23/03. Expected minimum SEV angle will be 1.76 degrees. The essential timeline based on a 30-min step scan for this 22 day, 8.5 hour event is: - SEZ entry (4.75 deg inbound) on Sept. 1 at 0100Z - Minimum Sun-Earth-ACE angle = 1.760 deg on Sept. 12 at 0800Z - SEZ exit (4.75 deg outbound) on Sept. 23 at 0930Z No problems have been encountered thus far during this transit. ===================================================================== OCRs Executed: NONE ===================================================================== Ongoing Activities: TAPS: Trending, Analysis and Plotting System (TAPS) development continues with emphasis being placed on fixing the DRs attributed to prior releases. Release 4.1.7 was successfully installed on 09/09/03. The Final release (4.1.8) is tentatively scheduled for 09/26/03. ---------------------------------------------------------------------------- Automation (ROBOTT): - Offline testing has been suspended on String 2 because primary operations was moved to this string in order to install ROBOTT Version 0.2 on String 1. - ROBOTT version 0.2 was successfully installed on String 1 and FOT testing will commence this week. - Automation Team testing of HSM and Command & Control on String 3 continues. C&C is shadowing passes and an expected delivery date to the FOT is 09/22/03. - The first draft of the SUG is expected to completed 10/01/03. ===================================================================== Anomalies: DOY 03255 (09/12/2003) ACE Anomaly G03-0084 - JPL Special Function Gateway (SFG) Problems During command validation with DSS-54, FOT did not receive a command echo from DSS-54. DSS-54 put telemetry online but it was not received at the MOC. DSS-54 informed FOT that everything looked nominal on their end and telemetry is leaving the station. Contacted JPL Comm, they reported that they were receiving telemetry from station. JPL Comm swapped the SFG- no change in status. FOT contacted IPNOC and they are investigating the situation. Similar problems were experienced by Chandra & WIND/POLAR due to the SFG (located at JPL Comm). IMPACT: Delayed AOS for 1 hr 36 min. Pass activities delayed and incomplete. All data was subsequently acquired during later passes. TT# NOC 000 8969 DOY 03259 (9/16/2003) ACE Anomaly G03-0085 - MAD (DSS-66) Oil Leak in Y-Axis of Antenna - Station RED DSS-66 declared RED for support (attitude maneuver). DSS-66 was unable to provide support due to a oil leak in the Y-Axis of the antenna. DSS-27 provided coverage for the pass, which was only shortened by 15 minutes. IMPACT: None. All planned activities accomplished successfully. DR#M101887 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~