MTA Monitoring Report 07/26/02 - 08/01/02

Archive of all weekly reports

Archive of monthly reports

We note that the HETG insertion angle has gone down by 1 bit (6.34 to 5.96) long after the insert move had been completed during this week's gratings observations. We think that it is following the long term trend towards smaller pot angles, but are looking more closely. See Gratings trends and Gratings insertion/retraction statistics.

Radiation

Two more flares were observed, but no alerts were issued during this period.

ACIS/Radiation Environment correlations

Detrended CTI

CTI analysis is now computed with "detrending" derived from reject counters for all imaging CCDs

Average of ACIS-I CCDs (MnKa) slope 1.024e-8 CTI/day
Detrended slope 1.009e-8 CTI/day

ACIS Warm Pixels


The following pixels consistently showed a bias level more than 5 sigma away the chip's mean level during this period.
We suspect some of the recurring bad pixels may be due to biases which are taken just after perigee, when the focal plane is somewhat warm. For more information see the link above and MTA monthly reports.



ACIS Focal Plane Temperature

For this period, 2 peaks are observed.

SIM Movements

17 TSC moves this period
weekly average time/step 0.00131 s
mission average time/step 0.00137 s

Telemetry

7/26 7/27 7/28 7/29 7/30 7/31 8/01

IRUs


Recent Observations

"Prob" means that there was probably bad time data included in the manual runs. This will be corrected in future processing.

OBSID DETECTOR GRATING TARGET ANALYSIS ACA
2739 ACIS-S HETG GS1826-238 OK /OK Prob
3125 ACIS-S NONE 2052-474 OK OK
2670 ACIS-S HETG WXHYI OK /OK OK
2880 ACIS-S NONE NGC533 OK Missing
2829 ACIS-S NONE DEML316 OK OK
3190 ACIS-I NONE NGC6861 OK OK
2967 ACIS-S NONE J2310-437 OK OK
3721 ACIS-S HETG WXHYI OK /OK OK
2531 ACIS-S HETG IMPEG OK /OK OK

Trending

This Week's focus GRAD

Trends last reported on May 16.
Only the most interesting or representative msids are shown below. For a full listing choose the bulletted link.