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HUBBLE SPACE TELESCOPE

DAILY REPORT #2532

PERIOD COVERED: 0000Z (UTC) 01/04/00 - 0000Z (UTC) 01/05/00

Daily Status Report as of 005/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of STIS/CCD 8530 (SMOV3a STIS BEA Science)

The Space Telescope Imaging Spectrograph (CCD) was used to obtain
SMOV3a Bright Earth Avoidance time period for science exposures with the
STIS CCD. Various kinds of targets are observed. The proposal completed
nominally.

1.2 Completed Two Sets of WF/PC-2 8492 (UV Monitor for -88C Cooldown)

The WF/PC-2 was used to conduct the UV monitor after the first
cooldown to -88C. Throughput measurements are also made using UV filters
and UV crossed with long-pass filters to determine red leak
contribution. -These are used to indicate any drop in throughput at Lyman
alpha, which could be due to contamination in the pick-off mirror. The
proposal completed nominally.

1.3 Completed S/C 8518 (Vehicle Disturbance Test)

The Vehicle Disturbance Test {VDT} is used to characterize the HST
dynamic response due to environmental disturbances during extended gyro
hold intervals. Disturbances are caused by on-board mechanism motion and
transient effects resulting from thermal strain. These disturbances excite
the natural modes of HST structural appendages and produce vehicle dynamic
response as measured by the rate gyros. Disturbance signatures are
compared with signatures taken after previous servicing missions to
identify changes in mechanisms or structures since the last VDT. The
disturbances observed will be used as the nominal on-orbit disturbances in
pointing control simulations until the next VDT is run. At least 5 orbits
at +V3 sunpoint {with 90-degree solar array angle} and 3 orbits at -V1
sunpoint {with 0-degree solar array angle} are required for this
test. Using two different solar array orientations allows additional
identification of disturbances induced by the solar arrays. Low bandwidth
attitude control gains are used to configure the HST for "nearly open-loop"
dynamic response during the test. This configuration allows observation of
HST disturbance response that is nearly independent of the affects of the
pointing control law. No science instruments are used during this
test. The test completed with no reported problems.

1.4 Completed WF/PC-2 8497 (Point Spread Function Verification)

The WF/PC-2 was used to verify the WFPC2 PSF after SM3A. There were
no reported problems.

1.5 Completed STIS/CCD 8507 (CCD Darks)

The Space Telescope Imaging Spectrograph (CCD) was used to obtain
weekly updates to the hot pixel list. The proposal completed as planned.

1.6 Completed Two Sets of FGS 8532 (White Dwarf and M-Stars in the
Solar Neighborhood; Revealing Binarity)

FGS-1 was used to conduct a high angular resolution survey with
FGS1r to detect binarity among nearby M dwarfs and white dwarfs. The
observations completed with no reported problems.

1.7 Completed Two Sets of STIS/CCD 8508 (CCD Bias Monitor C8)

The Space Telescope Imaging Spectrograph (CCD) was used to obtain
updates to the weekly superbiases. The proposal was completed as planned.

1.8 Completed STIS/MA2 8509 (NUV MAMA Darks)

The Space Telescope Imaging Spectrograph (MA2) was used to
determine the health of the FUV MAMA detector by monitoring the background
count rate. The observations completed with no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:
Scheduled Acquisitions: 15
Successful: 15

Scheduled Re-acquisitions: 1
Successful: 1

2.2 FHST Updates:
Scheduled: 31 Vehicle Disturbance Test
Successful: 31

2.3 Operations Notes:

Servicing Mission Orbital Verification (SMOV) activities are being
performed.

The Vehicle Disturbance Test (VDT) installation procedure was
performed at 004/1520Z per an operations request. The test ran nominally
as vehicle rates, attitude response, and solar array disturbances were
monitored. The next iteration of the test will occur early on day 007.

ROP SR-8 was utilized at 004/1521Zto configure the AER start and
stop commands.

A NICMOS memory dump was commanded at 004/164556Z. For reasons
that are not currently understood, the CCS system did not receive the dump,
although all required directives and procedures were followed. HSTAR 7461
was written. Later, at 004/210033Z, the NICMOS dump was successfully
performed.

The SSA transmitter was turned on and off at 004/1644Z as directed
by ROP IC-2.

There was a STIS EMC retry at 005/015116Z. HSTAR 7462 was
written. ROP NS-12 was used to clear the STIS flight software error
counter at 005/0219Z.

A TTR was written when the GCMR capability was lost at 005/0801Z
during a TDE event. As a result, there was a 2-minute, 10-second
non-recoverable loss of engineering data.

ESTR-2 was reconditioned at 005/0840Z, using ROP RD-7.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of SMOV and normal science observations and calibrations.

/CAW