ACE Weekly 10/31/03 - 11/06/03 All ACE spacecraft subsystems are performing nominally. An attitude maneuver was successfully executed on 11/06/03. The next attitude maneuver is scheduled for 11/21/03. ============================================================================ Orbit Events: The next SEV transit will occur November 26th through December 20th. The minimum SEV angle expected will be approximately 1.19 degrees. ===================================================================== OCRs Executed: DOY 03308 - OCR EPAM-005 17:08:43 - Sent the first of two commands, EPAM_OP1_SET SELECT_STROBE = 32, to set the F-STROBE to the HIGH threshold. 18:13:06 - Sent the second of two commands, EPAM_OP1_SET SELECT_STROBE = 28, to set the M-STROBE to the HIGH threshold. DOY 03310 - OCR CRIS-011 17:04:27 Sent the first command, CRIS_PONII. 17:05:30 Sent the second command, CRIS_IIGAIN PARM=219 Both of these commands are used to turn the CRIS Image Intensifier back ON. OCR SWPX-036 was scheduled for execution on DOY 03301 (10/28/03) but was delayed by Jim Griffee because of the solar activity. It is now scheduled for execution the week of 11/10/03. ===================================================================== Ongoing Activities: TAPS: Release 4.1.9 was delivered on 11/04/03 and was found to have a problem generating Long Term Trending (LTT) products. Release 4.1.10 was delivered on 11/06/03 and is currently being tested by the FOT. ---------------------------------------------------------------------------- Automation (ROBOTT): - ROBOTT version 0.2 (Offline) is operational on String 1. - ROBOTT Version 0.3 was installed on String 2 (11/05/03) following the FOT verification of fixed Offline and HSM DRs on String 3. The FOT is currently testing the release on String 2. - Command & Control is still being tested by the Automation team and the FOT. - The first draft of the SUG is expected soon. ===================================================================== Anomalies: DOY 03304 (10/31/2003) ACE Anomaly S03-0024 - SSCPAP5V Limit Violation. The FOT performed a replay of the VC4 data from Day 301-302 to see if there were any limit violations due to the X17 class solar flare and CME. The mnemonic SSCPAP5V violated the yellow low limit of 4.25V 2 times on day 302. For the first violation, the value dropped to 4.112 from 06:50:30 to 06:51:18. The second time, the value dropped to 4.064 from 07:02:51 to 07:03:39. Jim Raines notified. IMPACT: Unknown. FOT will continue to monitor. DOY 03304 (10/31/2003) ACE Anomaly S03-0025 - SWPE_OVRCNTALRM Limit Violation. The FOT performed a replay of the VC4 data from Day 301-302 to see if there were any limit violations due to the X17 class solar flare and CME. The mnemonic SWPE_OVRCNTALRM violated the yellow high limit 5 times from Days 301-302. The first violation was on day 301 from 20:08:06 to 20:29:26. The second violation was on day 301 from 21:05:42 to 21:18:30. The third violation was on day 301 from 21:29:50 to 21:44:06. The fourth violation was on day 301 from 22:01:10 to 22:26:46. The fifth violation was from day 301 at 22:31:02 to day 302 at 10:29:58. Jim Griffee notified. IMPACT: Unknown. FOT will continue to monitor. DOY 03306 (11/02/2003) ACE Anomaly G03-0109 - GDS 34m (DSS-27) Antenna Red DSS-27 informed the FOT that the antenna was red during the pre-pass briefing at 15:25. At 18:40, DSS-27 reported the antenna was working and telemetry was online at 18:49:09. The pass was extended until 22:15 in order to complete the SSR playback. IMPACT: Delayed pass activities. All telemetry was recovered. DR#G103611 DOY 03308 (11/04/2003) ACE Anomaly G03-0110 - GDS 26m (DSS-16) Command Problems At 16:06:20 the FOT was unable to send commands to the spacecraft. After several attempts the FOT requested DSS-16 manually reset the command modulation index to 0.86, but there was no success in commanding. ACE FOT requested DSS-16 re-sweep but still no success. FOT requested that DSS-16 reapply the command modulation (flip ON the command subcarrier). DSS-16 configured the command subcarrier from "only ON when sending a command" to "always ON". FOT was able to command successfully. The FOT requested that DSS-16 reset the command modulation to "only ON when sending a command". FOT then sent a /NO_OP command to verify status of command modulation; success with command modulation back to a nominal state. IMPACT: Unable to command to the spacecraft for ~17 minutes. Delay of pass activities for ~17 minutes. DR# G103617 DOY 03308 (11/04/2003) ACE Anomaly S03-0026 - S3DPU_CONV_SEC_I Limit Violation The mnemonic S3DPU_CONV_SEC_I violated its red high limit once at 15:58:28. The mnemonic came back within limits at 15:58:29. Mark Popecki notified. IMPACT: Unknown. FOT will continue to monitor. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~