HUBBLE SPACE TELESCOPE

       DAILY REPORT #3080

PERIOD COVERED:  0000Z (UTC) 03/25/02 - 0000Z (UTC) 03/26/02

Daily Status Report as of 085/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed FGS/1 9581 (A BEA Science Program: A High Angular 
Resolution Survey of Some of the Galaxy's Most Massive Stars)

        Fine Guidance Sensor #1 was used to make optimal use of otherwise 
unused telescope time while HST's pointing is restricted to the BEA cone 
during the first 12 days of SMOV3B.  The launch date of Feb 29 placed two 
of the Galaxy's most active star forming regions, Trumplers 14 and 16 in 
the Carina Nebula, within the BEA for the entire 12 day period.  FGS1r was 
used to
conduct a high angular resolution survey of the most massive and luminous 
stars in these two magnificent clusters to establish the incidence of 
binarity at the high mass end of the HR diagram. This survey will close the 
detection gap between spectroscopic and speckle surveys in which duplicity 
can be concealed and will dramatically improve our knowledge of the IMF at 
the high mass end of the main sequence as well as the luminosity function 
{LF} of star forming regions which produce such high mass stars.  Finally, 
this survey will identify targets for an approved SIM Key Science project 
to dynamically determine O-star masses.  There was no anomalous activity.

    1.2 Completed Eighteen Sets of NICMOS/1/2/3 8945 (Cooling System 
Monitoring)

        The Near Infrared Camera and Multi-Object Camera (NIC1, NIC2 and 
NIC3 was used 1}.to measure NICMOS detector performance during the 
cool-down and steady state operation of the NCS. 2}. to demonstrate 
stability {+/-0.1K} of the NICMOS detector temperature at the optimal 
science operating temperature. and 3}.to demonstrate repeatability {+/-0.1 
K} of NICMOS detector temperature following changes from the optimal 
science operating temperature.  As described in yesterday's report, the 
re-acquisition for the fifth iteration of this proposal failed, affecting 
that iteration when the take data flag remained down.  Then, as further 
described in 2.1 and HSTAR 8579, during the eleventh iteration, the 
acquisition defaulted to fine lock backup on one FGS only, possibly 
affecting the observations in that iteration.  Otherwise, no other problems 
were encountered.

    1.3 Completed Two Sets of WF/PC-2 8954 (SM3B Point Spread Function 
Verification)

        The WF/PC-2 was used to verify the Point Spread Function after 
SM3B.  There were no reported problems.

    1.4 Completed Eight 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.  As described 
in yesterday's report, the re-acquisition for the third iteration of this 
proposal failed, affecting that iteration when the take data flag remained 
down.  Otherwise, there were no other problems reported.

    1.5 Completed WF/PC-2 8950 (SM3B Cool Down, Contamination Monitor, and 
Focus Check)

        The WF/PC-2 was used to monitor the planned cooldown to -88C, 
followed by UV monitors, focus checks, as well as decons and associated 
monitors.  No problems were noted.

    1.6 Completed STIS/CCD 9163 (Kinematics Of Emission-Line Gas Disks In 
Radio-Quiet Galaxies)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
central black hole {BH} masses from the rotation rate of the emission-line 
gas, and to determine the nature and structure of the gas disks. Three 
galaxies with no radio jets and with Halpha+[NII] emission have been 
identified, which have dust disks similar to those commonly seen in our 
sample of radio-loud active galaxies.  All observations completed nominally.

    1.7 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.

    1.8 Completed Two Sets of FGS/1 8999 (SM3B Jitter Test)

        Fine Guidance Sensor 1R was used in both Position Mode {finelock} 
and Transfer Mode to observe selected targets in order to gain insight into 
the vehicle jitter characteristics after the alterations made to HST during 
SM3B.  As further described in 2.1 and HSTAR 8579, during the second 
iteration, the acquisition defaulted to fine lock backup on one FGS only, 
possibly affecting the observations in that iteration.  No other problems 
were encountered.

    1.9 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.

    1.10 Completed STIS/CCD 9068 (Accurate Determination of the BH Mass in 
Early-Type Disk Galaxies)

        The Space Telescope Imaging Spectrograph (CCD) was used to map the 
ionized gas velocity field of three early-type disk galaxies, for which we 
will be able to derive high precision BH mass measurements.  The sample 
galaxies have been selected by means of ground-based high resolution 
spectroscopy among 37 observed objects, since it is recognized in their 
central regions the clear presence of a circumnuclear Keplerian disk of 
ionized disk suitable for dynamical modelling.  The proposal completed with 
no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  6
    Successful:  6

        Per HSTAR 8579, the acquisition at 084/174019Z defaulted to fine 
lock backup on FGS-2 only.  The proposals defined in1.2 and 1.8 may have 
been affected.
  Scheduled Re-acquisitions:  8
    Successful:  8

    2.2 FHST Updates:
    Scheduled: 15
    Successful: 13

        The full maneuver updates at 085/0612Z and at 085/0615Z failed due 
to high FHST vehicle errors on both trackers 1 and 3.  HSTAR 8580 was written.

    2.3 Operations Notes:

        Using ROP SR-9A, the SSR-3 EDAC error counter was cleared three times.

        The engineering status buffer limit for SESBSLD was modified four 
times per ROP DF-18A.

        During this operational day, the following operations notes were 
performed:
Adjust ACS Error Count limit
NICMOS MEB Limit Changes
Turn Off ACS HRC/SBC Corrector Status limit
NICMOS MEB Limit Changes
NSSC-1 Load in Count Mode

        The SSR-3 playback pointer was set at 084/1240Z as directed by ROP 
SR-9A.

        A TTR was generated when there was a required re-transmit at 
084/1413Z during a 486 uplink.

        Using ROP IC-1, SSA transmitter #2 was turned on for the interval 
084/2257Z to 084/2324Z.

        The ephemeris table was uplinked at 085/0004Z per ROP DF-7A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

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

/CAW