MTA Monitoring Report 02/20/15 - 02/26/15

Archive of all weekly reports
Archive of monthly reports

Radiation

Quiet

Detrended CTI

Although we prefer to quote CTI values of the cleanest data (FT <= -119.7 C, int time > 7000sec), the data that fulfills these conditions are getting rare. We now quote CTI based on temperature corrected data for Focal plane temperature <= -118.5 C).

The unit is now CTI/year not CTI/day.

ACIS Warm Pixels

We display all bad pixels that have showed up in past, and, if any, previously unknown bad pixels appeared in the last 14 days. We also list hot pixels (defined as 1000 above the average of bias background). Warm columns 509-514 are probably due to boundaries.

New definitions of warm pixels and flickering pixels (May 15, 2014). If a pixel displays the level beyond a threshold for more than 70% of the time in the past two weeks, the pixel is categorized as a "warm" pixel. If a pixel is above the threshold more than 30% of time but less than 70% of the time in the past two weeks, the pixel is categorized as a "flickering" pixel.

ACIS Focal Plane Temperature

For this period, 4 peaks are observed.

Day (DOY)	Temp (C)	Width (Days)
51.61	-115.02	0.73
54.24	-113.12	1.17
56.93	-116.80	0.15
57.49	-116.62	0.23

Weekly focal plane temperature with sun angle and altitude overplotted. Sun angle is the solar array angle, that is the angle between the sun and the optical axis (+X axis). Altitude varies from 10 kkm to 135 kkm.

Telemetry

New violations or new extrema are shown in blue cells.

IRUs

• Gyro Bias Drift
• Gyro Bias Drift Histogram

Recent Observations

Trending

This week's focus is Spacecraft Bus and Subsystem Trends.

Last reported on Dec 11.

Only the most interesting or representative msids are shown below. For a full listing choose the bulletted link.

Min/max envelopes in dark blue appear on the trending plots. The envelopes are 4th degree fits to the monthly minimum and maximum values for each MSID. The final polynomial form and binning are still being experimented with. We will soon add to the trending pages a report of the fits and predictions they give on future limit violations. The light blue curve is our original smoothing of all the data over 30 day moving boxcars. The green/yellow line is a linear fit to all the data; the break occurs at a limit change.

• S/C Main Temperatures

MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
TCYLAFT1	304.98	4.23	2.358e+00	4.416e+00	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-1
TCYLAFT2	278.18	2.48	7.706e-01	2.947e-01	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-2
TCYLAFT3	264.24	1.64	1.553e-01	-1.263e-01	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-3
TCYLAFT4	267.64	2.22	1.292e-01	-3.100e-03	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-4
TCYLAFT5	282.93	4.36	1.324e+00	5.359e-01	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-5
TCYLAFT6	300.18	6.57	2.518e+00	1.103e+00	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-6
TMZLGABM	318.30	7.80	1.298e+00	1.715e+00	K	-Z LOW-GAIN ANTENNA BOOM TEMP
TSAMYT	319.87	2.01	1.290e-01	9.859e-02	K	-Y WING SOLAR ARRAY TEMP
TSAPYT	319.50	1.89	1.981e-01	1.030e-01	K	+Y WING SOLAR ARRAY TEMP



• S/C Main Temperatures - Previous Quarter

Previous Quarter
MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
TCYLAFT1	306.46	4.25	1.150e-01	-5.872e+01	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-1
TCYLAFT2	281.14	2.19	-7.990e-01	-9.911e+01	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-2
TCYLAFT3	265.23	1.80	-3.226e+00	4.707e+01	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-3
TCYLAFT4	268.38	2.21	-4.400e+00	1.081e+02	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-4
TCYLAFT5	286.69	3.28	-3.334e+00	9.345e+01	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-5
TCYLAFT6	307.59	4.55	-1.083e+00	7.888e+01	K	CNT CYL TEMP:16-IN FWD OF SC-TS FIT-6



• S/C Electronics

MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
OHRMAPWR	56.90	3.56	-1.544e+00	-3.008e-01	W	HRMA COMPUTED TOTAL POWER
OOBAPWR	50.11	4.17	-1.467e+00	3.055e-01	W	OBA COMPUTED TOTAL POWER

If you have any questions, please contact: swolk@head.cfa.harvard.edu