MTA Monitoring Report 4/13/01 - 04/19/01

SCS 107 Ran 2001:106:00:27 UTC
Science restored 2001:107:04:33
Lost Science Time 101 ks
Obsids to be rescheduled: 2105, 2109, 2120, 1619, 2118, 2191, 1697

See lost science log for more details

Tue, 17 Apr 2001 20:20:03 EDT A Radiation violation of P3 (130Kev) was observed by ACE
(limit = fluence of 3.6e8 particles/cm2-ster-MeV within 2 hours)
No action taken, SI safed for rad zone passage.

CTI Trend

Average of ACIS-I CCDs (MnKa) slope 1.789e-8 CTI/day
Detrended slope 1.288e-8 CTI/day

NEW! ACIS/Radiation Environment correlations

The following front-illuminated pixels consistently showed a bias level more than 100 counts above the chips's mean level during this period.
For more information on these and the back-illuminated chips, see the link above and MTA monthly reports.

CCD	CHIPX	CHIPY
6	766	501
8	62	482

ACIS Focal Temperature

For this period, 3 peaks are observed.

Day (DOY)	Temp (C)	Width (Days)
103.06	-113.89	0.29
105.96	-107.41	0.39
108.34	-115.51	0.25

MTA Problem Tracking

No new or reopened problems were reported in this period

Following msids are still coming
ES2P5CV 1DPDBBON ESAPYI ES1P5CV ESAPYI

SIM Movements

10 TSC moves this period
weekly average time/step 0.00136 s
mission average time/step 0.00139 s

Telemetry

On 4/13 and 4/16-4/17,

1DPPWRB(Computed DP Power Side B) hit red warning with min of 7.49 (lower red limit: 8.0).

4/14

Nominal HETG retraction

On 4/17-4/18,

FAMTRTEMP(FA Motor Temperature) hit yellow warning with max of 284.6 (upper red limit: 282).

TSCIUSF1 (SC-IUS FITTING-1 TEMP) hit a yellow warning with a max of 349.70 (upper yellow limit: 347.0)

4/18

Nominal HETG insertion

BOXTEMP (SEA Box Temperature) hit a yellow warning with a max of 292.15 (upper yellow limit: 292.0)

ELBI (Load Bus Current - high range) hit a yellow warning with a min of 51.28 (lower yellow limit: 52.0)

Recent Observations

The ACA Problem is in the specified handling of guide star positional errors.
This issue in not significant to the final product and so is being worked at low priority.

OBSID	DETECTOR	GRATING	TARGET	ANALYSIS	ACA
2022	ACIS	NONE	NGC 1316	OK	PROBLEM
2014	ACIS-S	NONE	NGC2403	OK	OK
2087	ACIS-S	HETG	MKN 509	OK /Grat	missing
1017	ACIS-S	HETG	EXO 0748-676	OK /Grat	OK
2070	ACIS-S	NONE	NGC 5018	OK	OK
971	ACIS-S	NONE	TWA-5	OK	PROBLEM
1646	ACIS-S	NONE	A3558	OK	OK
2080	ACIS-S	HETG	NGC 3516	Partial /Grat	PROBLEM

MSID	DESCRIPTION	COMMENTS
AACCCDRT	AC CCD TEMP	upward trend, around 289.1 after DOM 400
AAOTALT	LENS CELL TEMP	upward trend, around 287.4 after DOM 450
AAOTASMT	temp 4 - secondary mirror	upward trend, 287.1 after DOM 450
AAOTH2MT	AC OPT TEL ASSY SECONDARY MIRROR TEMP	upward trend, 287.4 after DOM 450
AACH2T	AC HOUSING TEMP	upward trend, around 287.75 after DOM 430
AACBPPT	AC BASEPLATE TEMP	mainly around 293.1, but upward scatter after DOM 450
AACBPRT	AC BASEPLATE TEMP	mainly around 289.7, but upward scatter after DOM 450
AACCCDPT	AC CCD TEMP	flat @262.78
*AACH1T	AC HOUSING TEMP	around 287.5 before DOM 510, then step up to 287.75
*AAOTAPMT	AC OPT TEL ASSY PRIMARY MIRROR TEMP	around 286.8 before DOM 510, then step up to 287.1
TEMPCCD	temp 1 - CCD	flat at 263.15
*TEMPHOUS	temp 2 - AC housing	around 287.55 before DOM 510, then step up to 287.95
TEMPORIM	temp 3 - lens cell	around 287.55 after DOM 400
TEMOSEC	temp 4 - secondary mirror	around 287.15 after DOM 430

IRU Temperature and Electronics

MSID	DESCRIPTION	COMMENTS
*AIRU1G2I	IRU-1 GYRO #2 CURRENT	downward trend currently around 99, perhaps slight upward trend starting DOM 600
AFSSPC1V	FSS POWER CONV 1 VOLTAGE	flat @ 3.50
AFSSPC2V	FSS POWER CONV 2 VOLTAGE	flat @ 0.0
AGWS1V	GYRO WHEEL SUPPLY 1 INPUT VOLTAGE	almost flat around 2.71
AGWS2V	GYRO WHEEL SUPPLY 2 INPUT VOLTAGE	flat @0.0
AIRU1BT	IRU-1 BASE TEMP	flat @313 after a bump finished around DOM 400
*AIRU1G1I	IRU-1 GYRO #1 CURRENT	upward trend since DOM 500, currently about 91.5
AIRU1G1T	IRU-1 GYRO #1 TEMP	flat @ 342.26
AIRU1G2T	IRU-1 GYRO #2 TEMP	flat @ 342.72
AIRU1VFT	IRU-1 VFC TEMP	flat @ 334.16
AIRU2BT	IRU-2 BASE TEMP	flat @ 252.59
AIRU2G1I	IRU-2 GYRO #1 CURRENT	flat @ 9.60
AIRU2G1T	IRU-2 GYRO #1 TEMP	flat @ 292.59
AIRU2G2I	IRU-2 GYRO #2 CURRENT	flat @ 9.60
AIRU2G2T	IRU-2 GYRO #2 TEMP	flat @ 292.59
AIRU2VFT	IRU-2 VFC TEMP	flat @ 292.58

PCAD Gyro Rates

MSID	DESCRIPTION	COMMENTS
AOSUNEC1	UNIT VEC. FROM THE SPACECRAFT	annual cycle between -1.0 and 1.0, second peak of mission around DOM 605
AOSUNEC2	UNIT VEC. FROM THE SPACECRAFT	annual cycle between -1.0 and 1.0, approaching second peak of mission
AOSUNEC3	UNIT VEC. FROM THE SPACECRAFT	annual cycle between -0.4 and 0.4, approaching second peak of mission
AOTAROT1	TARGET ATTITUDE	annual cycle between -0.6 and 0.6, approaching max
AOTAROT2	TARGET ATTITUDE	annual cycle between -1.0 and 1.0, approaching min
AOTAROT3	TARGET ATTITUDE	scattered between -0.8 and 0.6, slightly upward trend.
AOATTQT1	ESTIMATED S/C ATTITUDE	annual cycle between -0.6 and 0.8, approaching max, tracking commanded att.
AOATTQT2	ESTIMATED S/C ATTITUDE	annual cycle between -0.8 and 0.8, approaching min, tracking commanded att.
AOATTQT3	ESTIMATED S/C ATTITUDE	scattered between -0.6 and 0.6, tracking commanded att.
AOATTQT4	ESTIMATED S/C ATTITUDE	scattered between 0.0 and 1.0
AOCMDQT1	COMMANDED S/C ATTITUDE	annual cycle between -0.6 and 0.8, approaching max
AOCMDQT2	COMMANDED S/C ATTITUDE	annual cycle between -0.8 and 0.8, approaching min
AOCMDQT3	COMMANDED S/C ATTITUDE	scattered between -0.6 and 0.6
AOSCPOS1	SPACECRAFT POSITION VECTOR X	around 5 in log scale
AOSCPOS2	SPACECRAFT POSITION VECTOR Y	scattered between -1.2e5 to -2.0e4
AOSCPOS3	SPACECRAFT POSITION VECTOR Z	around 5 in log scale
AOSCVEL1	SPACECRAFT POSITION VEL	scattered between -1.5 and 1.0 more around 0.9
AOSCVEL2	SPACECRAFT POSITION VEL	scattered between -1.5 and 1.5
AOSCVEL3	SPACECRAFT POSITION VEL	scattered between -1.0 and 1.0
AI1AX1X	IRU-1 AXIS 1X ANALOG RATE	flat @ 0.0
AI1AX1Y	IRU-1 AXIS 1Y ANALOG RATE	flat @ 0.0
AI1AX2X	IRU-1 AXIS 2X ANALOG RATE	flat @ 0.0
AI1AX2Y	IRU-1 AXIS 2Y ANALOG RATE	flat @ 0.0
AI2AX1X	IRU-2 AXIS 1X ANALOG RATE	flat @ -3.72
AI2AX1Y	IRU-2 AXIS 1Y ANALOG RATE	flat @ -3.72
AI2AX2X	IRU-2 AXIS 2X ANALOG RATE	flat @ -3.72
AI2AX2Y	IRU-2 AXIS 2Y ANALOG RATE	flat @ -3.72

FTS Temp and Gradient

MSID	DESCRIPTION	COMMENTS
OHRTHR43	RT 134: PERISCOPE	slight upward trend 293.0 to 293.1
OOBAGRD3	RT 505 TO RT 504: PERISCOPE GRADIENT	slight downward trend 1.0 to 0.95
OHRTHR27	RT 20 : PERISCOPE	tightly scattered around 297.10
OHRTHR42	RT 133: PERISCOPE	tightly scattered around 294.10
OOBAGRD6	RT 507 TO RT 506: PERISCOPE GRADIENT	flat @0.03

PCAD Reaction Wheel Rates

MSID	DESCRIPTION	COMMENTS
AORWCMD1	REACTION WHEEL TORQUE COMMANDS 1	flat @ 0.0
AORWCMD2	REACTION WHEEL TORQUE COMMANDS 2	flat @ -0.01
AORWCMD3	REACTION WHEEL TORQUE COMMANDS 3	flat @ 0.0
AORWCMD4	REACTION WHEEL TORQUE COMMANDS 4	flat @ -0.01
AORWCMD5	REACTION WHEEL TORQUE COMMANDS 5	flat @ 0.0
AORWCMD6	REACTION WHEEL TORQUE COMMANDS 6	flat @-0.01
AORWCNT1	TACH PULSE COUNT 1	scattered between -60 and 60
AORWCNT2	TACH PULSE COUNT 2	scattered between -40 and 40
AORWCNT3	TACH PULSE COUNT 3	scattered between -60 and 60
AORWCNT4	TACH PULSE COUNT 4	scattered between -60 and 60
AORWCNT5	TACH PULSE COUNT 5	scattered between -40 and 60
AORWCNT6	TACH PULSE COUNT 6	scattered between -60 and 60
AORWMC1	COMMANDED REACTION WHEEL ANGULAR MOMENTUM	scattered between 16 and 28
AORWMC4	COMMANDED REACTION WHEEL ANGULAR MOMENTUM	scattered between -28 and -16
AORWMC5	COMMANDED REACTION WHEEL ANGULAR MOMENTUM	scattered between 16 and 26
AORWMC6	COMMANDED REACTION WHEEL ANGULAR MOMENTUM	scattered between 140 and 260
AORWSPD2	REACTION WHEEL RATES	scattered between -240 and -120, slight downward trend
AORWSPD3	REACTION WHEEL RATES	scattered between 140 and 280, slight downward trend
AORWSPD4	REACTION WHEEL RATES	scattered between -260 and -140
AORWSPD5	REACTION WHEEL RATES	scattered between 140 and 240, slight upward trend
AORWSPD6	REACTION WHEEL RATES	scattered between -260 and -160

Drift rate updated to Gyros

MSID	DESCRIPTION	COMMENTS
AOGBIAS1	GYRO DRIFT RATE ESTIMATED (ROLL)	flat @0.0
AOGBIAS2	GYRO DRIFT RATE ESTIMATED (PITCH)	flat @0.0
AOGBIAS3	GYRO DRIFT RATE ESTIMATED (ROLL)	flat @0.0
AOGYRCT1	ACCUM. GYRO PULSE COUNTS	scattered between -1500 and 1000
AOGYRCT2	ACCUM. GYRO PULSE COUNTS	scattered between -200 and 200
AOGYRCT3	ACCUM. GYRO PULSE COUNTS	scattered between -300 and 300
AOGYRCT4	ACCUM. GYRO PULSE COUNTS	scattered between -400 and 400