ACE Weekly 11/19/04 - 11/25/04 All ACE spacecraft subsystems are performing nominally. An attitude=20 maneuver was successfully executed on 11/22/04 The next attitude maneuver= =20 is scheduled for 12/06/04. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D Orbit Events: From Craig Roberts (FDF): The next ACE Solar Exclusion Zone transit has begun. ACE crossed the 4.75= =20 deg mark inbound on 11/15/04, and will exit outbound by 12/09/04. As the=20 ACE Lissajous orbit transitioned to an opening pattern mid-summer, we are=20 now in an era where the Sun-ACE separation angle at closest approach will=20 be greater with each successive crossing (for the next couple of=20 years). This time the angular radius of closest approach (RCA) will be=20 0.83 degrees. More details below: 3.0 deg inbound: 11/20 02:17Z 2.0 deg inbound: 11/22 18:53Z 1.0 deg inbound 11/25 19:29Z 0.83 deg RCA 11/26 21:32Z 1.0 deg outbound 11/28 12:08Z 2.0 deg outbound 12/01 13:24Z 3.0 deg outbound 12/04 06:50Z ACE will spend 2.7 days below 1.0 deg. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D OCRs Executed: None =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Ongoing Activities: TAPS: - TAPS Release 4.3 was installed on the Prime System on 10/13/04. -- FOT regression testing is in progress. --- No problems to report. ---------------------------------------------------------------------------- Automation (ROBOTT): - ROBOTTv0.9 delivered to String 1 on 09/27/03 (OCR GND_145). -- Performing operations in "Auto" mode on String 1. -- 13 DR fixes in this release. --- 12 DRs have been verified by the FOT to date. --- The last DR to be verified will require ROBOTT to be=20 observed over a period of time to ensure no reoccurrence of the problem. -- 13 DRs have been written against this release. - ACE transitioned to Lights Out Operations on 11/13/04. All nominal=20 realtime operations are now being performed using ROBOTT, with the=20 exceptions of maneuvers and special commanding. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D Extra Spacecraft Activities: None =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Anomalies: DOY 04324 (11/19/04) ACE Anomaly G04-0136 =96 MAD 26m (DSS-66) XMTR RED Station unavailable due to transmitter problems. FOT requested time with=20 DSS-27 (occupied by Maintenance) and updated pass times in ROBOTT. If FOT= =20 was not available, the pass would have been lost. IMPACT: Minimal.=20 Delayed pass activities. All data recovered. DR# M102897 DOY 04324 (11/19/04) ACE Anomaly G04-0137 =96 File Not Available A new configuration monitor was not copied to the operational string during= =20 the configuration management process. IMPACT: This generated an error=20 during the execution of a TSTOL procedure. All pass activities completed. DOY 04327 (11/22/04) ACE Anomaly G04-0138 =96 GDS (DSS-27) Poor RF Link= Margin Snow and wind at Goldstone reduced SNR to 3dB at BOT. Other projects were= =20 unable to complete supports. ACE, however, was able to successfully=20 retrieve all data. IMPACT: None DOY 04328 (11/23/04) ACE Anomaly G04-0139 =96 JPL Router Problems Router problems significantly reduced data flow to the MOC. Consistent=20 telemetry was available for 55 minutes allowing the spacecraft to be=20 commanded and the playback to start. IMPACT: Minimal. All data was=20 available on CDR and subsequently retrieved by the FOT. DOY 04328 (11/23/04) ACE Anomaly G04-0140 =96 ROBOTT - No Notification of=20 Problems Only 1 frame was received at AOS. No further data was received until=20 BOT+22min. C&C did not identify the loss of telemetry or the delay in=20 uplink. C&C did correctly diagnose subsequent problems. IMPACT: If FOT=20 had not been in on this day there would have been no indication to an=20 on-call FOT engineer that a problem had occurred. DR CDSID# 21110 DOY 04328 (11/23/04) ACE Anomaly G04-0141 =96 ROBOTT - Tasks Started at Same= Time Telemetry was offline when the SSR transitioned to idle. Telemetry was=20 back online in time to start the procedure g_end_day. C&C started two=20 procs at the same time (s_ops_plbk_complete and then g_end_day 1.5 seconds= =20 later). IMPACT: None. TPOCC held s_ops_plbk_complete at line 76 as=20 g_end_day was executing. DR CDSID# 21085 DOY 04328 (11/23/04) ACE Anomaly G04-0142 =96 ROBOTT - C&C Did Not Resume While the spacecraft was in BinDump format, C&C incorrectly stated that the= =20 spacecraft was in medium rate after telemetry outages. C&C did not=20 successfully resume activities after this occurred. IMPACT: Not all pass= =20 activities completed as scheduled. DR CDSID# 21111 DOY 04328 (11/23/04) ACE Anomaly G04-0143 =96 ROBOTT - Notification Not= Received The sporadic telemetry due to JPL router problems resulted in 132=20 notifications (mostly TLM offline/online). All were received via email but= =20 only 48 were received via pagers. DOY 04329 (11/24/04) ACE Anomaly G04-0144 =96 GDS 34m (DSS-27) Incorrect=20 Uplink Time A schedule change was submitted on 11/23. DSS-27 enabled the uplink at the= =20 previously scheduled BOT time. Fortunately, there was an 11 second gap=20 between DSS-66 carrier down and DSS-27 carrier up=20 times. IMPACT: None. DR# G105008 DOY 04329 (11/24/04) ACE Anomaly G04-0145 =96 ROBOTT - Failure to Clear= Problem C&C detected a 'Command Failed' problem and did not clear the problem after= =20 it was resolved. IMPACT: Erroneous message for rest of pass. DR CDSID# 21074 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 gamiller@pop500.gsfc.nasa.gov ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~