ACE Weekly 03/05/04 - 03/11/04 All ACE spacecraft subsystems are performing nominally as ACE is progressing outbound from its closest angular approach to the Sun. An attitude maneuver was successfully executed on 03/08/04. The next attitude maneuver is tentatively scheduled for 03/16/04. ============================================================================ Orbit Events: The current ACE transit began February 22 and ends March 15 (a span of 22.49 days). This transit will involve the closest angular approach to the Sun yet seen, i.e., 0.63 degree (deg) from solar center. (By comparison, the solar angular radius as seen from Earth at that epoch will be approx. 0.27 deg). The updated details and epochs (UTC) follow: 22 Feb 05:22 4.75 deg inbound 28 Feb 15:51 2.0 deg inbound 01 Mar 17:19 1.19 deg inbound 03 Mar 21:57 0.63 deg closest approach 06 Mar 13:40 1.19 deg outbound 08 Mar 17:55 2.0 deg outbound 15 Mar 16:14 4.75 deg outbound The 1.19 deg reference was included because that was the closest approach during the December transit. ACE will spend 4.85 days within the 1.19 deg zone. ===================================================================== OCRs Executed: None ===================================================================== Ongoing Activities: TAPS: - Release 4.2.1 was delivered on 02/27/04 and is currently being regression tested by the FOT. Some problems have been encountered and the developers have been notified. While these problems will be required to be fixed they should not preclude the transition from GTAS to TAPS tentatively scheduled for 03/18/04. - Comments submitted from the latest SUG review have been included in the latest revision of the SUG released for review on 03/10/04. ---------------------------------------------------------------------------- Automation (ROBOTT): - Release 0.5 was installed on String 2 on 03/09/04. CRON testing will begin on 03/19/04, with failover monitor testing to begin the week of 03/22/04. - Release 0.6 should have fixes for all open DRs and should not include any GTAS tasks as the TAPS software should be operational by then. Depending on how many DRs are opened for Release 0.5, the next release should be ready in early April. ============================================================================ Extra Spacecraft Activities: None ===================================================================== Anomalies: DOY 04068 (03/08/04) ACE Anomaly G04-0020 - MOPSS Errors While bringing up MOPSS for the scheduled maneuver received error messages which inhibited the starting of the MOPSS software processes. MOPSS was recycled and all processes started up nominally. IMPACT: None. The maneuver was not delayed due to this problem. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~