HUBBLE SPACE TELESCOPE

       DAILY REPORT #3075

PERIOD COVERED:  0000Z (UTC) 03/18/02 - 0000Z (UTC) 03/19/02

Daily Status Report as of 078/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Six Sets of ACS/WFC/HRC 8947 (Weekly Test)

        The Advanced Camera for Surveys (WFC and HRC) was used to perform 
basic tests to monitor, the read noise, the development of hot pixels and 
test for any source of noise in ACS CCD detectors.  This program will be 
executed at least once a day for the entire lifetime of ACS.  There were no 
problems reported.

    1.2 Completed Two Sets of STIS/CCD 8963 (CCD Bias)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
CCD read noise from multiple bias frames obtained in common science modes: 
amplifier D, gains 1 and 4 electrons/DN, and binning factors of 1x1, 1x2, 
2x1, and 2x2.  The read noise measurements before and after NCC turn-on are 
then compared, and standard calibration reference files for use in pipeline 
reduction of SMOV3B data are constructed.  The proposal had no reported 
problems.

    1.3 Completed Two Sets of STIS/CCD 8964 (CCD Darks)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
dark frames twice daily, as in a corresponding calibration 
program.  Standard calibration reference darks are constructed and hot 
pixel lists are updated for use in pipeline reduction of SMOV3B data.  All 
observations completed without incident.

    1.4 Completed STIS/CCD 8906 (Hot Pixel Annealing)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
the effectiveness of the CCD hot pixel annealing process by measuring the 
dark current behavior before and after annealing and by searching for any 
window contamination effects.  In addition, CTE performance is examined by 
looking for traps in a low signal level flat.  There were no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 0
    Successful: 0

  Scheduled Re-acquisitions: 0
    Successful: 0

    2.2 FHST Updates:
    Scheduled: 0
    Successful: 0

    2.3 Operations Notes:

        Operations personnel remain in the GSFC STOCC.

        The NICMOS Cyro Cooler (NCC) has been recovered.  Since that was 
accomplished, the NCC continues to operate nominally.  As of 078/1130Z, the 
TA inlet temperature is 161.5 degK.  Cooldown continues.

        An intercept load for the current Science Mission Specification is 
expected today with an expected start time of approximately 079/0000Z.

        COP 3.46 (Attitude Determination) is being iteratively executed in 
order to maintain coarse mode attitude during the period when both the 
FHSTs and the FGS high voltage is off for the NCS operations.  At 
078/0948Z, the HST coarse attitude error was 1.67 deg.

        Operations requests were used to command the following:
NCC Circulator Start @ 077/1814z
NCC Compressor Start @ 077/1817z
Dump 8051 History Buffer @ 077/1833z
Clear NCC flags & Turn on PCE @ 077/2028z
PCE Recovery @ 077/2234z
Adjust NCS CPL Reservoir SetPoint @ 077/2238z
Prevent CPL Flood @ 077/2359z
NCC Circulator Start @ 078/0003z
NCC Compressor Start @ 078/0024z
Dump 8051 History Buffer @ 078/0125z
Modify 8051 History and Min/Max Buffer Collection @ 078/0146z
NCS Control to PID Operate @ 078/0203z
Reset Min/Max @ 078/0305z

        The following operations notes were executed during the day:
FGS HV Monitoring during the NCS activities
Coarse Attitude Determination during NCS Fill Operations
FHST 2 Mounting Bracket Limit Change and Monitoring
EPS Batteries 5 and 6 Current Limit Adjustment Post SM3B

        ROP NS-03 was utilized to perform an NSSC-1 status buffer dump at 
077/2032Z.

        The ephemeris table was loaded at 078/0001Z per ROP DF-07A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of Servicing Mission Orbital Verification and the 
gradual resumption of normal science observations and calibrations.

/CAW