@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ @ @ MTA Monitoring Report 6/02/00 - 6/08/00 @ @ @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ *********** Lost Data Update ************** Although old processed data are not yet restored, lost data between 5/1-5/8 for mta L0 were reprocessed and restored. ************ CTI trend ************* Everything looks smooth this week. ************** MTA Problem Tracking ***************** None of them are new Some of them are HRC related, and others are reaction wheel related. HRC - We intend to Stop flagging these: 2P4BSCR, 2DRLSOP, 2RSRFALV, 2DRLSOP, 24SRFALV, AOPSAMUL AWD3TQI, 1DPDBBON, ES1P5CV, ES2PSCV, ASPEB5CV, AGWS2V, AIOBP5CV, AOVAMPWR, AOFUNLST, C28VMONB, CUSOB28V, CIUB5V, CIUB15V, AWD1TQI, AWD4TQI, AWD2TOI, AWD5TQI, AWD6TQI RADIATION BELT PASSAGE - SEHSE400 ******** Trending *********** software note: Trending has bugs and it is not working this week. Sorry. ************* Telemetry *********** 1DPICBCU (AMP: DPA INPUT CURRENT B) show yellow warning from 6/5-6/7. This is first time we observed the warning. The limits are 0.3 1.5 0.0 1.8 (yellow lower, upper, red, lower, upper). From PGF: The FEPs were powered off during SI Safing so the B-side DPA was only powering a halted BEP-B board. In this state, it is quite normal for 1DPICBCU to run under 0.3 amps. It has averaged ~0.26 amp since first on-orbit activation whenever its FEPs are powered off. The yellow limit might well be lowered to 0.24A. From SJW We will change this limit. Note, We are changing AORWSPD(1-6) limits to the followings in near future: Low Red Low Yellow Upper Yellow Upper Red - -628.0 -596.0 596.0 628.0 *********** ACIS Focal Temperature ******** Acis focal plane temperature peaked three times. Day (DOY) Temp (C) Width (DAY) 154.41 -112.0 0.23 157.05 -112.3 0.22 149.70 -110.0 ~0.22 *********** Photon Page ************ Acis OBSID DETECTOR GRATING TARGET ANALYSIS - --------------------------------------------------------- 367 ACIS-I NONE Q1422+231 OK 582 ACIS-S NONE AXAF SOUTH.DEEP OK 363 ACIS-I NONE PG1115+080 OK 665 ACIS-I NONE 1736-297 OK 588 ACIS-S NONE NGC7027 OK 435 ACIS-S NONE 3C 351 OK 690 ACIS-S HETG BHXB OK 309 AICS-I NONE M31 TRANSIENT OK 939 ACIS-I NONE AXJ1510+0742 OK 741 ACIS-I NONE PSR J0437-4715 OK 832 ACIS-S NONE PG1254+047 OK 689 ACIS-S HETG BHXB OK Following OBSID do not have full analysis: 62034, 62036, 62037, 62041, 62043, 62044, 62042, 62332, 62330, 62331, 62328, 62329, 62302, 62301, 62306, 62303, 62304, 62300, 62305, 62898 Hrc OBSID DETECTOR GRATING TARGET ANALYSIS - --------------------------------------------------------- 142 HRC-I NONE G21.5-0.9 OK Also the following OBSID were analyzed: 1704, 1705 (HRC-S) Grating 1703 MISSING ANALYSIS 1704 OK 1705 OK 690 ACIS-S HETIG BHXB MISSING ANALYSIS 1715 OK 1714 OK The msids with missing analysis are both acis observations. ******** Note from Experts ************** About AORWSPD* yellow warning from the last report (Dan Schwartz) The reaction wheels store angular momentum on Chandra. When too much momentum is stored, we fire reaction control jets to unload it. "A momentum auto-unloading event was performed by Chandra for the first time during the interval 151:17:19:22 to 151:17:27:33. Momentum unloading had always been predicted and performed via stored commands, so the auto-unload was unexpected. This was near perigee, so a gravity gradient torque larger than we calculated is suspected. Everything behaved properly, as designed." I assume the high wheel rates you report are just before the automatic momentum unloading occurred.