MTA Monitoring Report 12/28/01 - 01/03/02

Archive of all weekly reports

Archive of Monthly reports

Radiation

The following alerts were issued. None required action, as ACIS attenuated fluence remained within budget.

Date: Fri, 28 Dec 2001 20:35:05 (EST)
A Radiation violation of P3 (130Kev) was observed by ACE
Observed = 3.6408e+08
(limit = fluence of 3.6e8 particles/cm2-ster-MeV within 2 hours)

Date: Sat, 29 Dec 2001 20:55:02 (EST)
ACIS fluence = 1.00e+09 p/(cm^2-sr-MeV) in previous 44.2 hrs

Date: Mon, 31 Dec 2001 11:05:01 (EST)
ACIS fluence = 1.01e+09 p/(cm^2-sr-MeV) in previous 18.9 hrs

ACIS/Radiation Environment correlations

CTI Trend

Average of ACIS-I CCDs (MnKa) slope 1.242e-8 CTI/day
Detrended slope 1.181e-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, two peaks were observed

SIM Movements

8 TSC moves this period
weekly average time/step 0.00132 s
mission average time/step 0.00137 s

Telemetry

We are looking into the limits of HRMAAVG. This is a pseudo msid monitored at the suggestion of KODAK. Limits appear to be set incorrectly.

Ephin thermal violations are also being investigated. Most likely due to perihelion passage and attitude configuration.

Acis DPA violations are due to FEP operational change in response to the T-plane latchup anomaly.

12/28 12/29 12/30 12/31 01/01 01/02 01/03

Gyro Bias Drift


Recent Observations

OBSID DETECTOR GRATING TARGET ANALYSIS ACA
3144 HRC-S LETG NGC 4051 OK /Grat not yet aval. OK
2584 HRC-S LETG HZ43 OK /Grat OK
2601 HRC-I LETG HZ43 OK /Grat OK
2600 HRC-I LETG HZ43 OK /Grat OK
3018 ACIS-S NONE PSS0134+3307 OK OK
3414 ACIS-S LETG C/LINEAR OK /Grat OK
3416 ACIS-S LETG C/LINEAR OK /Grat OK
3415 ACIS-S LETG C/LINEAR OK /Grat OK
3040 ACIS-I NONE NGC 4038/NGC 4039 OK OK
2567 ACIS-S HETG HD 37022 OK /Grat not yet aval. OK
3029 ACIS-S NONE SDSS020651+121624 OK OK
2520 ACIS-S LETG C/LINEAR OK /Grat OK
2817 ACIS-S NONE VELA OK OK
2554 HRC-I NONE ALPHA TAURI OK OK
2547 HRC-S LETG BETA CETI Partial /Grat OK

Trending

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

Most msids are keeping the same trends from the previous reporting period ( 10/12/01 - 10/18/01 weekly).
Interesting trends are indicated with "*".