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HUBBLE SPACE TELESCOPE

DAILY REPORT #3093

PERIOD COVERED: 0000Z (UTC) 04/11/02 - 0000Z (UTC) 04/12/02

Daily Status Report as of 102/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Four Sets of STIS/CCD 8902 (Dark Monitor-Part 2)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks. No problems were reported.

1.2 Completed Two 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.

1.3 Completed Twenty-five Sets of ACS/WFC 8948 (CTE Test)

The Advanced Camera for Surveys (WFC) was used to measure the
baseline charge transfer efficiency {CTE} performance of the HRC and WFC
detectors, emulating the CTE ground calibration testing. Also, a similar
program will perform periodic measurements in order to track the change in
the CTE as damage due to radiation exposure accumulates. All observations
were successful.

1.4 Completed STIS/CCD 9131 (Imaging the Host Galaxies of High Redshift
Type Ia Supernovae)

The Space Telescope Imaging Spectrograph (CCD) was used to complete
the snapshot survey of distant galaxies of known redshift which hosted
supernovae {SNe} of Type Ia found via the Supernova Cosmology Project
{SCP}. No problems were seen.

1.5 Completed STIS/CCD 9077 (Survey of the LMC Planetary Nebulae)

The Space Telescope Imaging Spectrograph (CCD) was used to perform
a snapshot survey of all known LMC planetary nebulae {PNe} in order to
study the co-evolution of the nebulae and their central stars, and to probe
the chemical enrichment history of the LMC. There were no reported problems.

1.6 Completed STIS/CCD 9176 (LMC Eclipsing Binaries with Cepheid
Components: The Key to the Extragalactic Distance Scale)

The Space Telescope Imaging Spectrograph (CCD) was used to
determine the distance to the LMC and to observe the Cepheid P-L that form
the backbone of the Cosmic Distance Scale and the determination of
H_degrees. Unfortunately, in spite of concerted efforts of many
investigators, the zero point of the Cepheid P-L law and the LMC distance
remain controversial and uncertain to ~10-15, using eclipsing binaries
{EBs} as "standard candles'' to include two recently discovered LMC
eclipsing binaries {EBs} with Cepheid components. These observations of
these extraordinary systems hold the key to determining simultaneously the
Cepheid P-L zero point and the LMC distance, and to provide a direct test
of the Baade-Wesselink parallax method. There were no reported problems.

1.7 Completed STIS/CCD 8904 (Bias Monitor-Part 2)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at
gain = 4 in order to build up high-S/N superbiases and track the evolution
of hot columns. The proposal completed with no anomalous activity.

1.8 Completed Two Sets of WF/PC-2 9091 (Evolution of Star Forming
Environments in H II Regions)

The WF/PC-2 was used to look for evaporating gaseous globules and
silhouette disks in two young clusters and along one molecular cloud
wall. The proposal completed nominally.

1.9 Completed ACS/HRC/WFC 9292 (The Nature of Galaxies at z > 4)

The Advanced Camera for Surveys (HRC and WFC) was used to further
look into recent discoveries of a number of galaxies and quasars at
redshifts greater than 5 that has identified the z>5-6 epoch as key to
understanding the earliest formation phases for galaxies. However,
establishing the characteristics and properties of these earliest galaxies
is proving to be a particularly difficult. They are faint, with I{AB}
magnitudes around 26-27. Thus, substantial investments of time are needed
to obtain high S/N images, while ground-based spectroscopy, even with 8-10
m class telescopes, has provided little more than redshifts. Establishing
the physical properties of these galaxies will be a challenge for the
foreseeable future. However, there is a subset of this high redshift
population that is amenable to more detailed study. These are sources that
have been strongly lensed by low redshift clusters. No problems were reported.

1.10 Completed STIS/CCD 9070 (A Census of Nuclear Star Clusters in
Late-Type Spiral Galaxies: II. Spectroscopy and Stellar Populations)

The Space Telescope Imaging Spectrograph (CCD) was used to
investigate spiral galaxies that have a prominent star cluster in their
dynamical center. Statistics for cluster frequency, size, and luminosity
remain incomplete. The proposal completed as planned.

1.11 Completed Three Sets of WF/PC-2 8937 (Cycle 9 Supplemental Darks
pt2/3)

The WF/PC-2 was used obtain three dark frames every day to provide
data for monitoring and characterizing the evolution of hot pixels. No
problems were encountered.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:
Scheduled Acquisitions: 4
Successful: 4

Scheduled Re-acquisitions: 10
Successful: 10

2.2 FHST Updates:
Scheduled: 10
Successful: 10

2.3 Operations Notes:

The NICMOS Cryo Cooler cool down continues and is now in the range
of the expected endpoints. As of yesterday morning, the NICMOS Outlet
Temperature (MNPNCOLT) was 78.73K (expected end point 76K), the NCC TA
Inlet Temperature (MNPTAILT) was 67.49K (expected end point 68K), the CLI
Temperature (MNPLINTT) was 70.07K (expected end point 71K), and the NICMOS
Inlet Temperature (MNRNCILT) was 62.92K (expected endpoint 63K).

The CCS engineering status buffer limits were adjusted at 101/2218Z
per ROP DF18A.

Per an operations note, the limit adjustment CCL was updated on all
CCS strings by 101/2225Z.

Using ROP SR-1A, the SSR-1 EDAC error counter was cleared at 102/0346Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

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

/CAW