ACE Weekly 12/24/2008 - 12/30/2008 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: Type Attitude Date 12/30/2008 DOY 365 2008 Thrusters 2R 4R+ 4R- Duration 16:30 min Start 16:23:33z Stop 16:40:03z HGAStart -7.74deg HGAStop 7.28deg SunStart 7.93deg SunStop 11.49deg SpinStart 4.9939rpm SpinStop 4.9988rpm Nutation 0.11deg Firing 83 pulses FuelUsed 0.2672lbs FuelRemain 145.5164lbs FinalSCMass 1379.776lbs The next attitude maneuver is scheduled for Friday 01/09/2009. =========================================================================== OCRs: DOY 357 (12/22/2008) GND-196 Install Patchlink (continued) Patchlink was installed on the remaining Windows and Linux computers. GSFC IT Security is requiring Patchlink software to be installed on RIONet computers. Only the ACE Windows and Linux computers will have Patchlink; it will not be installed on the HP-UX 10 computers. McAfee VirusScan on Windows needed to be upgraded to 8.5 to avoid Patchlink memory leak problems. Currently, the Patchlink daemon has been left running and the computers are automatically connecting to Patchlink server. The option to turn off the Patchlink daemon and re-enable it once a month is available if problems are found. ============================================================================ Activities: No problems are expected for the 1/1/2009 leap second. The leaps seconds are only used on the ground when calibrating the spacecraft's timer to UTC. seconds since launch (including leap seconds) = (slope * SpacecraftCounter) + offset UTC = (slope * SpacecraftCounter) + offset + epoch - leap seconds Data Capture: 100% DOY 356-363 2008 There is a higher than normal risk of data loss from October 2008 through February 2009. If there are problems with the passes, it may not be possible to acquire additional DSN time. This higher-risk period has been occurring every winter for the past couple of years. For more information refer to 10/14/2008 weekly. ============================================================================ Anomalies: Update on DSN 26m data delivery (AR# G08-0104 G08-0127 G08-0129) DSN will create a new 26m desktop with both TCP channels set to Low Latency (data sent to both the ACE MOC and the DSN CDR). The two channels will be set to different bit-rates so that duplicate data is not sent to the ACE MOC. DOY 359 12/24/2008 S-ACE-0402 G08-0135 Patchlink Memory Leak Patchlink has a known memory leak issue with McAfee VirusScan 8.0 https://support.lumension.com/scripts/rightnow.cfg/php.exe/enduser/std_adp.p hp?p_faqid=272 VirusScan had not been updated when Patchlink was installed on acetlanpc. IMPACT: Minimal. Memory used by Patchlink grew to 300MB over the holiday weekend. The only other software running on acetlanpc was the DSN 0158 Monitor Data Display (SIMSS). DOY 364 12/29/2008 S-ACE-0403 G08-0136 ACE SLE Software Running as Root The ACE MOC SLE software is running as root on ac2sle2. It should be running under the acefot account; as is the case on ac1sle1. IMPACT: Minimal. The only impact found has been that log files cannot be closed and re-opened for a new pass.