ACE Weekly 11/26/04 - 12/02/04 All ACE spacecraft subsystems are performing nominally. No maneuvers were= =20 executed this reporting period. The next maneuver (Stationkeeping and=20 Attitude) 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: The ACE Solar Exclusion Zone (SEZ) transit is nearing an end. ACE crossed= =20 the 4.75 deg mark inbound on 11/15/04, and will exit outbound by=20 12/09/04. The angular radius of closest approach (RCA) was 0.83 degrees on= =20 11/26/04. No problems with the downlink to date. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ From Manuel Montoro (FDF): There is an ACE stationkeeping maneuver (SK-34) scheduled for=20 12/06/04. Preliminarily, it looks as follows: --delta-V =3D 0.3159 m/s --burn duration =3D 57.606 sec --fuel usage =3D 0.2184 lbm (0.099 kg) The delta-V is Sunward, which calls for the aft-end axial thrusters 3A and= =20 4A. The SK burn will follow an attitude reorientation scheduled for 16:20= =20 UTC. The estimates given above should be considered accurate to first=20 order; improved accuracy will be possible following an orbit determination= =20 update and Lissajous re-targeting based on that new orbit solution. =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 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=3D=3D=3D=3D=3D=3D= =3D Ongoing Activities: 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: Received a request from Jim Griffee (SWEPAM) to investigate the possibility= =20 of commanding the SWEPAM-Ion instrument to collect certain data. The goal= =20 is to characterize the instrument's spectral sensitivity to CEM voltage=20 steps, but doing so in the presence of an ever varying "calibration"=20 signal...the real-time solar wind. A telecon will occur at 1800Z,=20 12/07/04, to further discuss the data collection requirements and the=20 feasibility of commanding the instrument to capture that data. =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 Anomalies: DOY 04333 (11/28/04) ACE Anomaly S04-0018 =AD SWICS YL Limit Violation Mnemonic SSCPAP5V violated the yellow low limit of 4.25 once during the=20 pass from 14:01:11 - 14:01:23, the value was 4.208. Notified Jim=20 Raines. Impact: Unknown. DOY 04334 (11/29/04) ACE Anomaly S04-0019 - SWICS YL Limit Violation Mnemonic SSCGR20V violated its YL limit twice. (1) 333-18:01:55-18:02:19,=20 value 17.00 and (2) 13:11:22-13:11:46, value 16.90. Notified Jim=20 Raines. IMPACT: Unknown DOY 04335 (11/30/04) ACE Anomaly G04-0146 - ROBOTT - Command Capability=20 Acquired Late FOT received page "Commanding Acquired 10 minutes after=20 Acquisition/BOT". C&C still beeping and reporting "Command Failure" after= =20 command capability acquired. FOT verified Automation was running properly= =20 and used "clear problem" button to end the beeping. IMPACT: Minimal. DR=20 CDSID# 0021074 DOY 04336 (12/01/04) ACE Anomaly G04-0147 - H/W - Workstation AC1WS2 Failed All workstations were shutdown and powered off for transition to the new=20 UPS (Uninteruptable Power Supply). After the UPS transition was complete= =20 and while starting all of the workstations, SysAdmin found that ac1ws2 was= =20 unable to access boot partition. IMPACT: Primary operations switched to=20 String 2 with String 3 as backup for operations beginning 12/02/04. DOY 04337 (12/02/04) ACE Anomaly G04-0148 - ROBOTT - ROBOTT Failed To=20 Configure For Support ROBOTT did not start TPOCC on String 2 workstations or XTerms. ROBOTT only= =20 brought up TPOCC on Front-End 2. Developers notified. IMPACT: FOT=20 required to intervene, configure, and monitor pass in the event additional= =20 problems occurred. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~