ACE Weekly 10/18/02 - 10/24/02 All ACE spacecraft subsystems are performing nominally. A "dog-leg" attitude maneuver was executed this week to a HGA target angle of 6.5 deg. with no problems to report. A triple maneuver ("dog-leg" attitude and a station-keeping maneuver) is scheduled for 11/01/02. ============================================================================ OCRs Executed: ULEIS-029 - DOY 020296, 10/23/02, 17:20:36, Turn ON Front (Start 1) HVPS ULEIS-030 - DOY 020296, 10/23/02, 17:29:36, Turn OFF Front (Start 1) HVPS ============================================================================ Ongoing Activities: The HGA Angle Constraint Report is still being reviewed. ------------------------------------------------------------------------- Two 26M demo tests with DSN were performed this week. DOY 02289 - Successful test was completed with only minor issues with the Ground Receipt Times (GRT). DOY 02290 - No analysis was performed on DSN Monitor Data. There were problems reacquiring 498bps rate data at end of pass otherwise the test was unremarkable. ============================================================================ Anomalies: Day 02295 (10/22/2002) ACE Anomaly #G02-0119 TPOCC - Erroneous data While running the procedure g_precal, a warning message was received that the command FSN 146 does not match clcw FSN 1. After noticing the warning message, it was noticed that the standard header page had the S/C time, Total VC2 Packets, Total VC4 Packets, and the Ground Frame Sequence Numbers populated with data from the end of pass on DOY 294. Then while running the procedure g_end_day, the result of the "snap ace_cmdstat" directive had an extra command that was transmitted on DOY 294. IMPACT: None. Under Investigation. DOY 02297 (10/24/2002) ACE Anomaly #G02-0120 GDS(DSS-27) Mon Blocks Offline DSN Monitor Blocks were offline from 15:51:23 to 16:18:48. IMPACT: Loss of DSN Monitor data. DR#G101738 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Glen A. Miller Honeywell Technology Solutions Inc. ACE Flight Operations Team Goddard Space Flight Center Building 14, Room W10A Mail Stop 428.2 Greenbelt, MD 20771 Office: 301-286-7071 Fax: 301-286-1729 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~