NASA Hubble Space Telescope Daily Report #4856

HUBBLE SPACE TELESCOPE – Continuing to collect World Class Science

DAILY REPORT #4856

PERIOD COVERED: 5am May 29 – 5am June 1, 2009 (DOY 149/0900z-152/0900z)

OBSERVATIONS SCHEDULED

ACS 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.

FGS 11458

Optimizing FGS2R2 Performance with the AMA

Ths proposal satisfies SMOV4 AD OTA/FGSS-054. S-curves with PUPIL and F583W will be obtained at selected locations within the FGS2R2 FOV during SMOV4. These data will be will be used to adjust the AMA so as to align the HST pupil onto the interferometer’s Koesters prisms. The final AMA position will be set to produce an acceptable set of S-curves across the FGS2R2 FOV. The AMA will be adjusted using CCL/instructions from the ground. It is intended that this proposal executes during the SMOV4 BEA and will require several (on the order of 4) iterations to achieve optimal interferometric performance.

WFC3 11454

Activation Test

This program (WFC3 SMOV program WFC3-01) verifies that WFC3 is in the same condition after release from the Shuttle as during the Functional Test (FT), which was conducted with HST in the Shuttle?s payload bay. This analog test will be implemented in stored commanding that will be generated from a Phase II proposal, whereas the in-bay FT was run with real-time CCLs.

The purpose of the FT was to demonstrate that WFC3 is viable for scientific research. This was accomplished by demonstrating that WFC3 can be commanded to the nominal scientific operating state and can carry out nominal scientific operations of the UVIS and IR channels, including operation of the thermoelectric coolers (TECs), corrector and focus mechanisms, UVIS shutter, SOFA and FSM filter wheels, detectors, and Control Section (CS). Only one Side of the CS is verified.

This test is compatible with execution during the post-FT, Safe-Protect period. Operability of the TECs is not demonstrated in this test, but is demonstrated in the SMOV Detector & TEC activation programs, WFC3-04 and WFC3-05.

ACS 11373

SBC Dark Current Measurement

This takes a series of SBC dark measurements over a continuous period of about 6 hours (4 orbits). The aim is to collect dark images during an extended SBC on-time. Earlier measurements indicate that the dark current increases with SBC on-time and may also be increasing with overall SBC use. The 6-hour time matches the longest time used by any observer. As with all SBC observations this needs continuous SAA free time.

ACS/SBC 11372

SBC UV Contamination Check

ACS/SBC throughput in the far-UV will be monitored during the bright earth avoidance period through use of two non-BEA visits, each of one orbit separated by one week allowing observations of NGC 6681. A waiver for two non-BEA orbits during BEA was previously granted. Exposures will be taken in PR110L, F115LP, F125LP, F140LP, F150LP and F165LP as in recent UV Monitor program observations. These results will be one of the activities determining if the BEA can be ended. A third visit just after BEA ends will repeat the above monitoring and include one orbit with F122M. ON HOLD visits 4 and 5 would substitute for 1 and 2 if SM4 is delayed.

ACS 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.

COS 11355

COS NUV Initial On-Orbit Turn-On and Recovery after Anomalous Shutdown

This proposal is designed for the initial turn-on of the COS NUV MAMA detector. The same procedure may later be used to recover the detector after an anomalous shutdown. Anomalous shutdowns can occur as a result of bright object violations which trigger the Bright Scene Detection or Software Global Monitor. Anomalous shutdowns can also occur as a result of MAMA hardware problems. The Initial MAMA turn-on consists of three tests: a signal processing electronics check; a slow high voltage ramp-up to an intermediate voltage; and a slow high voltage ramp-up to the full operating voltage. During each of the two high voltage ramp-ups, diagnostics are performed during a dark time-tag exposure. The turn-on is followed by a MAMA Fold Analysis Test. The complete sequence is contained in visits 1 through 4. If a second execution is required during cycle 17, visits 5 through 8 will be run and another proposal prepared for possible future occurrences.

Supports Activities COS-04 and COS-07

STIS4 11349

Mechanism Mini-Functional

Move mechanisms, except the corrector, through the full range of previous on-orbit motion to redistribute lubricant and verify operability. Wait at least one minute after each move to allow telemetry to update so moves can be verified. Supports Activity STIS-04

STIS 11348

Science Data Buffer Check with Self-Test

The STIS Science Buffer RAM is checked for bit flips during SAA passages. This is followed by a Control Section (CS) self-test consisting of writing/reading a specified bit pattern from each memory location in Buffer RAM. The CS Buffer RAM self-test as well as the bit flip tests are all done with the CS in Operate. Supports Activity STIS-03

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:

18463-0 OBSINT Gyro Bias Update @ 149/17:35z

18458-0 Clear ACS Event Flag 2 (SBC MAMA) Part 2 @ 149/15:56z

18465-0 Clear COS Event Flag 2 after NUV initial turn on Part 1 @ 151/13:36z

COMPLETED OPS NOTES: (None)

                        SCHEDULED      SUCCESSFUL



FGS GSAcq               19                  19

FGS REAcq                0                   0

OBAD with Maneuver      13                  13

SIGNIFICANT EVENTS: (None)