HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT       #4873

PERIOD COVERED: 5am June 23 - 5am June 24, 2009 (DOY 174/0900z-175/0900z)

OBSERVATIONS SCHEDULED:

COS23/FUV 11356

COS FUV Initial On-Orbit Turn-On

This proposal specifies the procedure for SMOV initial HV turn-on and

ramp-up of the COS FUV detector. (The FUV will have been commanded to

its Operate state to support execution of proposal 11353.) The procedure

is detailed in the Observing Description, but in summary, the following

is done: The initial transition from FUV Operate to HVLow is broken into

two parts, with a gap of 4 hours between turning on the HV and ramping

to the HVLow (SAA) voltage. This will be followed by 5 cycles of HV

ramp-up and return to HVLow. Cycles will ramp up to successively higher

(magnitude) voltage, with the fifth cycle going to the nominal operating

values. There will be a gap of at least 4 hours between cycles. All HV

ramp-up will be done at 10 sec per HV "step". The step rate and cycle

voltage values (for Segments A and B) must be patched in FSW in each

cycle prior to the HV ramp commanding. Memory monitors will be set on

the patched memory locations. Immediately after any HV commanding, and 4

hours after ramp-up commanding, the DCE memory will be dumped.

Immediately after HV ramp-up commanding higher than HVLow, short DARK &

WAVE exposures will be obtained. Visits 01 and 02, and all the

subsequent even numbered visits (the ones 4 hours after HV ramp-ups),

end with NSSC-1 COS event flag 3 being set. If the flag remains set,

subsequent FUV commanding will be skipped. Thus, Operations Requests

must be in place to clear the flag prior to those subsequent visits.

Real-time monitoring of the telemetry will be used to guide the

decisions whether or not to clear the flag. The final visit (13)

provides a scheduled final opportunity to clear flag 3, and if the flag

is cleared, initiates nominal FUV HV commanding and requests a DARK

exposure.

ACS/WFC 11369

ACS CCD functional test for WFC

During the ACS Repair (ACS-R) conducted during Hubble Servicing Mission

4 (SM4), astronauts will install a CCD Electronics Box Replacement

(CEB-R) and Low-Voltage Power Supply Replacement (LVPS-R). A rudimentary

aliveness/functional test (AT/FT) will be conducted on-orbit during SM4.

Shortly after SM4, the more comprehensive CCD function test (FT) defined

in this program will be conducted as part of SMOV. This program is

modeled after the original CCD functional test (HST program 9005, PI

Mark Clampin) conducted following the initial installation of ACS during

Hubble Servicing Mission 3B. This WFC-only proposal has a companion HRC

proposal 11396.

WFC3/IR 11420

IR Detector Functional Test

This program measures the baseline performance and operability of the IR

detector using only internal observations: darks and internal (WFC3

calsystem) flatfields. The images will be used to evaluate readnoise,

dark current, gain, and cursory characterization of the reference

pixels. Most data will be taken in default full-frame readout mode

(four-amp, gain 2.5 setting), but in addition darks and flats will be

taken in each of the 4 subarrays. A set of internal flatfields will be

acquired to provide absolute gain measurements for each amplifier at the

nominal setting (2.5 e-/DN).

WFC3 11421

WFC3 Channel Select Mechanism Test

The operation and positioning of the Channel Select Mechanism (CSM) will

be verified for the WFC3 UVIS and IR channels. An extended target will

be observed in both channels to verify that the field of view is not

blocked or vignetted in any way when the CSM is set for UVIS and IR

channel operations. Internal IR flat field images will also be used to

verify the correct positioning of the IR diffuser paddle. This proposal

corresponds to activity ID WFC3-08.

WFC3/UVIS 11424

WFC3 UVIS Initial Alignment

The corrector mechanism will be used to iteratively bring the UVIS

channel of WFC3 into alignment with the OTA using phase retrieval of

focus diverse star images over the field. Three visits are required;

corrector offsets will be uplinked after each visit via realtime

command.

This proposal is activity id WFC3-11

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary reports

of potential non-nominal performance that will be investigated.)

HSTARS:

11895 - ACS Suspended @ 174/16:19:58z

11896 - At 175/01:43:47 we received a search radius limit exceeded on

           FGS 3 before the scheduled start of the GSAcq. The GSAcq(1,3,3) was

           scheduled to start at 175/01:44:28, GSAcq(1,3,3) was successful

           Observations Affected, None

HSTAR for DOY 167:

11894 - A Loss of Lock occurred at 2009.167/00:11:34 while guiding on P1S3D3.

COMPLETED OPS REQUEST:

18549-4 - COS Suspend Recovery @ 174/19:53z

COMPLETED OPS NOTES: (None)

                      SCHEDULED      SUCCESSFUL

FGS GSAcq               4                   4               

FGS REAcq               0                   0                

OBAD with Maneuver 4                   4           

SIGNIFICANT EVENTS:

Flash Report:

The COS successfully completed it's recovery to Operate with the FUV

ramped to HVNom at 274/19:50.