MTA Monitoring Report 05/25/12 - 05/31/12

Archive of all weekly reports
Archive of monthly reports

Safe Mode Entry of May 29, 2012

Chandra entered safemode at 2012:150:03:33:29z (During ObsID 13650) due to a trip of the sun-position monitor. Telemetry showed that the fine-sun-sensor (FSS) began to show erratic data as the spacecraft pitch-angle neared the edge of the fine-sun-sensor field-of-view. Analysis of the FSS data and FSW indicates that both the region check and comparison check with the coarse-sun-sensor failed, which lead to the trip. It is not known yet whether we have ever operated this close to the edge of the FSS field-of-view with the sun-position monitor enabled. There are no hardware failures and only the possibility of a very slight variation in the FSS performance. There are no concerns with recovery from safemode to primary components. The OFLS characteristics will be modified to change the pad used in calculating the FSS FOV from 1deg to 3deg.

(from Chandra Safemode Status Summary 05/29/2012)

Radiation

Quiet.

Detrended CTI

Although we have quoted CTI values of the cleanest data (FT <= -119.7 C, int time > 7000sec), the data fills these conditions are getting rare. We quote CTI temperature factor corrected ones. The values in the parentheses are CTI based on the cleanest data.

Average of ACIS-I CCDs (MnKa) slope: 2.227e-5 CTI/day (1.375e-5 CTI/day)
Detrended slope: R6.894-9 CTI/day (7.057e-5 CTI/day)

ACIS Warm Pixels

We display all bad pixels 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 a computational artificial effect due to boundaries.

 CCD0CCD1CCD2CCD3CCD4CCD5CCD6CCD7CCD8CCD9
Previously Unknown Bad Pixels                    
Current Warm Pixels     (104,31) (526,66) (764,98) (703,739) (721,765) (811,637) (917,340) (931,553)   (233,315) (233,321) (233,322) (233,323) (233,324) (233,325) (233,326) (258,797) (263,317) (352,544) (367,511) (369,376) (669,577) (1023,166) (41,81) (843,420) (884,31) (1000,214) (335,412)    
Flickering Warm Pixels (153,205) (117,749) (667,782) (692,141) (802,665) (910,239) (427,125)       (233,327) (280,313) (233,328) (282,385) (641,669) (745,313) (109,1)   (199,678) (139,109) (356,902) (881,53) (913,165) (1024,453) (1024,454) (1024,455) (1024,456) (1024,457) (1024,458) (197,241) (587,544) (833,325) (326,978) (636,819) (40,49) (569,1016)
Current Hot Pixels                    
Flickering Hot Pixels                    
Warm column candidates                    
Flickering Warm Column Candidates                    

ACIS Focal Plane Temperature

For this period, 1 peak are observed.

Due to safe mode entry, the parts of the focal temperature data are missing.

Weekly focal plane temperature with sun angle, earth angle, and altitude overplotted. Sun angle is the solar array angle, that is the angle between the sun and the optical axis (+X axis). The earth angle is the angle between earth and the ACIS radiator (+Z axis). Altitude varies from 34 kkm to 128 kkm.



SIM Movements

5 TSC moves this period

Telemetry

New violations or new extrema are shown in blue cells.

MSID 05/25/12 05/26/12 05/27/12 05/28/12 05/29/12 05/30/12 05/31/12 yellow limits
(lower)
upper 		red limits
(lower)
upper 		Units Description
AACH1T (293.96) (294.70) (294.70) (295.81) (295.81)     (314.0)
341.0		(264.0)
373.0 		K #PEA1 AC HOUSING TEMPERATURE IMAGE 0
ELBI   49.99 49.73 49.47       (17.0)
32.0		(3.0)
75.8 		AMP #LOAD BUS CURRENT
OOBTHR45       295.36       (281.9)
292.0		(250.2)
308.0 		K #RT 67: TFTE COVER
OOBTHR56 295.62 298.12 299.01 299.73 298.30     (281.9)
295.0		(250.2)
308.0 		K #RT 158: OBA CONE


IRUs

Recent Observations

OBSID DETECTOR GRATING TARGET ANALYSIS ACA
13768 ACIS-0123 NONE G327.1-1.1 OK OK
13747 ACIS-7 NONE XTE J1810-197 OK OK
13767 ACIS-0123 NONE G327.1-1.1 OK OK
13979 ACIS-0123 NONE six-5 OK OK
13988 ACIS-01236 NONE Abell 2219 OK OK
13298 ACIS-012367 NONE M31 OK OK
13594 ACIS-01236 NONE A773 OK OK
13978 ACIS-0123 NONE six-4 OK OK
14045 ACIS-0123 NONE J1354.4-3746 OK OK
14430 ACIS-0123 NONE G327.1-1.1 OK OK
14044 ACIS-0123 NONE J1354.0-1123 OK OK
13325 ACIS-678 NONE SDSS J0947+1421 OK OK
14226 ACIS-7 NONE MAXIJ 0556-332 OK OK
13806 ACIS-235678 NONE PSR J1355-6206 OK OK
13650 ACIS-35678 NONE Ruprecht 147 OK OK

Trending

This week's focus is HRMA Thermal.

Last reported on Mar 08.

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.







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