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.
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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.
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OCRs Executed:
None
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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.
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Extra Spacecraft Activities:
None
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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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~