ACE Weekly 12/12/03 - 12/18/03 All ACE spacecraft subsystems are performing nominally. An attitude maneuver was successfully executed on 12/18/03. The next attitude maneuver will occur on 01/02/03. ============================================================================ Orbit Events: We're coming to the end of the SEZ transit. Closest angular approach to the Sun was 1.19 deg. To date there has been no SEZ related problems. To summarize the 24-day transit by epoch and SEV angle: 26 Nov 20:56Z 4.75 deg (inbound) 5 Dec 01:22Z 2.0 deg 8 Dec 18:17Z 1.19 deg (minimum) 12 Dec 19:27Z 2.0 deg 20 Dec 22:00Z 4.75 deg (outbound) The next SEZ event will start around 02/22/04 and the minimum angle will be approximately 0.645 degrees. ===================================================================== OCRs Executed: None. ===================================================================== Ongoing Activities: TAPS: Release 4.1.12 was delivered on 12/18/03 and is currently being tested by the FOT. ---------------------------------------------------------------------------- Automation (ROBOTT): - ROBOTT version 0.3 (Offline) is operational on String 1. - ROBOTT Version 0.4 is ready to be installed on String 2 once operations is moved back to String 1 on 12/19/03. This release will include HSM, Offline, and Command & Control. - The first draft of the SUG is expected soon. ===================================================================== Anomalies: DOY 03350 (12/16/2003) ACE Anomaly G03-0124 - GDS 34m (DSS-27) Delayed AOS At pass start DSS 27 informed ACE FOT that they had telemetry online and was "go for command". ACE FOT informed DSS 27 that they did not see telemetry online. DSS-27 then began resweep. DSS 27 then informed ACE FOT that they were having problems obtaining good VCOs and were in the process of reinitializing the Exciter. At 15:21:09, ACE FOT reported seeing telemetry online, nominal AGC's and VCO's. IMPACT: Delayed pass activities for 6 minutes. DR#G103843. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~