MTA Monitoring Report 10/05/01 - 10/11/01

Archive of all weekly reports

Archive of Monthly reports

Radiation

A Radiation violation of P3 (130Kev) was observed by ACE on 11 Oct 2001 (limit = fluence of 3.6e8 particles/cm2-ster-MeV). Science was not interrupted as HRC-S+LETG was in place and the alert condition was short-lived.

ACIS/Radiation Environment correlations

CTI Trend

Average of ACIS-I CCDs (MnKa) slope 1.379e-8 CTI/day
Detrended slope 1.324e-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 Temperature

For this period, 2 peaks were observed. Widths of the peaks seem to be wider than usual.

MTA Problem Tracking

Note: Problem Tracking system is currently not working properly. Many problems reported are not listed on the table.

SIM Movements

7 TSC moves this period
weekly average time/step 0.00140 s
mission average time/step 0.00136 s

Telemetry

10/5 10/6 10/7 10/8

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
1667 ACIS-I NONE MS2053.7-0449 OK OK
1626 ACIS-S NONE PKS2135-14 OK OK
2318 ACIS-S NONE RCW103 OK OK
2699 ACIS-S HETG BHCTRANSIENT OK /OK OK
1007 ACIS-S NONE NGC6093 OK PROBLEM
1915 ACIS-S NONE SAXJ1753.5-2349 OK OK
1575 ACIS-S NONE M31NUCLEUS OK MISSING
2226 ACIS-S NONE A2556 OK OK
1576 ACIS-I NONE M31 NUCLEAR REGION OK OK
3361 ACIS-S NONE ABELL496 OK OK
3382 HRC-S LETG RXJ1856.5-3754 OK /NOT AVIL OK
3402 HRC-S LETG CAL83 OK /OK OK

Trending

This Week's focus OBA Thermal
Temperatures in degrees K. Current in Amps. Voltage in Volts.

Most msids are keeping the same trends from the previous reporting period ( 07/20/01 - 07/26/01 weekly).
Interesting trends are indicated with "*".

One noticeable change is observed for OOBTHR24. A trend is dipped around DOM 800 slightly deeper than a normal amplitude of the variation.