NASA Hubble Space Telescope Daily Report #4855

HUBBLE SPACE TELESCOPE

Continuing to collect World Class Science

PERIOD COVERED: 5am May 28 – 5am May 29, 2009 (DOY 148/0900z-149/0900z)

OBSERVATIONS SCHEDULED

ACS/WFC 11367

CCD Hot Pixel Annealing

Hot pixel annealing will be performed during SMOV4 before the CCDs are used for observations. The CCD TECswill be turned off and heaters will be activated to bring the detector temperatures to about +20C. This state will be held for approximately 12 hours, after which the heaters are turned off, the TECs turned on, and the CCDs returned to normal operating condition. To assess the effectiveness of the annealing, a bias and four dark images will be taken before and after the annealing procedure for both WFC and HRC. All the data for this program are acquired using internal targets. The initial annealing occupied 5 visits. A copy of these visits to be run 4 to 5 weeks later has been added to support proposals 11465, 11510 and 11511. The latter proposal was too long.

S/C 11370

SBC MAMA Recovery

Procedure normally used when ACS MAMA anomalously shuts down. We will also use it during SM4 following the planned shutdown. Recovery procedure is designed to carefully bring the MAMA back to operating condition while watching for possible problems. The final step is to do a fold analysis which gives detailed information about how well the instrument is performing.

ACS/WFC/S/C 11809

ACS CEB-R Optimization Iteration 1

During the early weeks of SMOV the ACS-R team will work to find the best parameters for CEB-R and the WFC CCD operations before continuing with the normal SMOV activities and eventually enable science operations. This optimization needs to be done in an iteratively way. The plan is to have up to eight iterations spread out through SMOV week 2-4. A core-set of observations aimed to assess the performance of the CCDs and to check the relative phasing between the internal ASIC signal and the incoming video signal will be repeated in all iterations. In any given iteration a specific test will be run to determine the best value for a given parameter. Data collected in each iteration will be quickly analyzed and if needed, new parameters will be uploaded in real time before the following iteration. The data will consist of a mix of normal data (bias, flat, EPER, darks) and O-mode data. In order to facilitate the program implementation, data collection and reduction, the program will be implemented in eight different proposals. 11809 covers the fist iteration and it executes all the tests.

S/C 11347

Memory Load and Dump

This proposal is a test and verification of the STIS dump of memory capability. Areas of Control Section (CS) to dump include: EDAC RAM, EEPROM, and CS PROM (with the CS in Operate). Areas of MIE memory to dump include: MIE RAM and MIE PROM (with the MIE in Operate). Note that the MIE memory must first be copied to CS buffer RAM as images, which are then dumped. Supports Activity STIS-02

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary reports of potential non-nominal performance that will be investigated.)

HSTARS: (None)

COMPLETED OPS REQUEST:

18460-0 – Restore WFC3 SDH tasking orders @ 148/1315z

18456-0 – Clear ACS Event Flag 2(SBC MAMA) Part 1 @ 148/1338z

COMPLETED OPS NOTES: (None)

                      SCHEDULED      SUCCESSFUL



FGS GSAcq              5                    5

FGS REAcq              0                    0

OBAD with Maneuve      5                    5

SIGNIFICANT EVENTS:

Flash Reports:

-Six checks of WFC3 Buffer RAM have been conducted during SAA passes and no bit flips occurred.

WFC3 remains operating nominally in its Protect Operate state. On Day 149/13:00z the servicing mission functional test will occur via stored commanding. The next major activity for WFC3 will be transitioning out of its Protect state and detector cooldown, tentatively scheduled for the week of June 7th.