| Date: | 2004-06-19 23:45:00 | |
| Sender: | Pascal Willis (via Carey Noll) <Carey Noll <noll@cddisa.gsfc.nasa.gov>> | |
| Subject: | [SLR-Mail] No. 1226: TOPEX Status | |
| Author: | Pascal Willis | |
| Content: | ******************************************************************************** SLR Electronic Mail 2004-06-19 23:45:00 UTC Message No. 1226 ******************************************************************************** Author: Pascal Willis (via Carey Noll) Subject: TOPEX Status (forwarding email from Lee Fu) Please note the following update. This is great news, thanks to the perseverance and ingenuity of the MIssion Operations Team. The Tandem Mission goes on. SPAT STATUS REPORT for Thursday, June 17, 2004 UTC 04-169 (Cycle 433) SYSTEMS This morning the Spacecraft was successfully commanded back to the Normal Mission Mode, thus completing the recovery from the Safehold Mode, which was entered on May 26. Nadir pointing accuracy for the ALT, which was turned On on June 11, is again within specified limits. Performance and configuration of all systems is nominal, with the following exceptions: - The ADCS is under 3-wheel control due to the failure of the Roll Wheel. - The autonomous Kick-Start function operates as required to restart a stalled wheel. - The ADCS autonomous Failure Detection and Correction (FDC) function has not yet been re-enabled. - The Telemetry Monitoring (TMON) function has not yet been re-enabled. ADCS - ADCS performance in transitioning from OBC Mode 2 to the Normal Mission Mode (4B) was excellent. The Wheel Kick-Start function continues to operate as designed. POWER - Power Subsystem performance continues to be nominal. The Solar Array is under the control of the OBC and the Offset Bias of 36 degrees has been re-established. Pending re-enabling of the TMON function, battery temperature is being controlled via ground command. TELECOM - TELECOM performance is nominal. C&DH & OBC - Performance is nominal. - Although Tape Recorder-C Playback transients are still being encountered, over 99% of all recorded data is being acquired at the control center. SENSORS - Mission Sensor Operations are nominal. - As noted above, nadir pointing is again within specified limits. ------------------------------------------------------------- Lee-Lueng Fu JPL 300-323 4800 Oak Grove Drive Pasadena CA 91109 FAX:818-393-6720. VOICE: 818-354-8167 -- Pascal Willis Jet Propulsion Laboratory, MS 238-646 Ph : 1-818-393-4748 4800 Oak Grove Drive FAX: 1-818-393-4965 Pasadena CA 91109 Em : Pascal.R.Willis@jpl.nasa.gov From: Carey Noll ******************************************************************************** |