ACE Weekly 12/21/2010 - 12/27/2010 All ACE spacecraft subsystems are performing nominally. ======================================================================== Orbit/Attitude: Type Attitude Date 12/23/2010 DOY 357 2010 Thrusters 2R 4R+ 4R- Duration 12:23 min Start 16:22:40z Stop 16:35:03z HGAStart -4.94deg HGAStop +7.50deg SunStart 6.33deg SunStop 16.89deg SpinStart 5.0656rpm SpinStop 5.0686rpm Nutation 0.17deg Firing 63 pulses FuelUsed 0.2010lbs FuelRemain 131.6116lbs FinalSCMass 1365.871lbs The next attitude maneuver is scheduled for Wednesday 01/05/2011. ======================================================================= OCRs: None ======================================================================== Activities: Data Capture: 100% DOY 353-360 2010 There is a higher than normal risk of data loss from October 2010 through February 2011. If there are problems with the passes, it may not be possible to acquire additional DSN time. ======================================================================== Anomalies: Update on AR#G10-0082: DSN DCD problems that caused prime and backup DCD to switch resulted in data being unavailable on the DSN's FDS website. DSN manually imported the data and it is now available. ACE Science Center was not impacted by the DCD problem. (DR#N106933 and N106950) DOY 355 12/21/2010 S-ACE-0568 G10-0083 DSS-65 Brief Telemetry Delay While DSN/Madrid was replacing UPS batteries, a router was disconnected. There were 5 brief (40 seconds) delays in telemetry from 1445z through 1517z. (DR#M106095) IMPACT: Minimal. There were no gaps in the telemetry, only 5 brief delays in the delivery of telemetry to the MOC. DOY 358 12/24/2010 S-ACE-0569 G10-0084 Goldstone Power Glitch DSN/Goldstone experienced a power glitch and DSS-27 stopped tracking at 1733z (BOT=1550z EOT=1920z). DSN attempted several remote resets but were unsuccessful. Personnel did not arrive in time to resolve the problem before the end of the ACE track. (DR#G110893) IMPACT: No telemetry, including NOAA Space Weather, for the remainder of the pass (107 minutes). SSR playback completed on the following pass. Manual intervention required for MMOC procedure cleanup. DOY 360 12/26/2010 S-ACE-0570 G10-0085 ITOS tm_controller Before Beginning Of Track, ITOS had problems connecting telemetry, "timeout reading from tm_controller". ITOS was stopped and restarted. IMPACT: Manual intervention required. ************************************************************************** Andrew J. Davis, Caltech, Mail Code 292-17, Pasadena CA 91125. Phone: 360-681-3020, 626-429-0844 (cell) Email: ad@srl.caltech.edu Web: http://www.srl.caltech.edu/ACE/ASC