Hubble Space Telescope Daily Report #2922 26 Jul 2001

HUBBLE SPACE TELESCOPE

DAILY REPORT #2922

PERIOD COVERED: 0000Z (UTC) 07/25/01 – 0000Z (UTC) 07/26/01

Daily Status Report as of 207/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two Sets of STIS/CCD 8864 (CCD Dark Monitor-Part 2)

The Space Telescope Imaging Spectrograph (CCD) was used to monitor
the darks for the CCD. The proposal completed nominally.

1.2 Completed Four Sets of WF/PC-2 8828 (Cycle 9 Supplemental Darks pt3/3)

The WF/PC-2 was used to obtain three dark frames every day to
provide data for monitoring and characterizing the evolution of hot
pixels. The proposal completed with no reported problems.

1.3 Completed Fourteen Sets of STIS/CCD 8808 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation III)

The Space Telescope Imaging Spectrograph (CCD) was used to make
non-scripted, parallel observations as part of a POMS test proposal. The
observations completed with no anomalous activity.

1.4 Completed Nine Sets of FGS/1 9169 (An Interferometric Harvest of
Double Degenerates)

Fine Guidance Sensor #1 was used to observe the white dwarf mass
and age distributions that hold clues to the star formation history of our
Galaxy and the age of the disk. No problems were reported.

1.5 Completed Ten Sets of WF/PC-2 9244 (POMS Test Proposal: WFII
Parallel Archive Proposal Continuation)

The WF/PC-2 was used to perform a generic target version of the
Archival Pure Parallel program. The program will be used to take parallel
images of random areas of the sky, following the recommendations of the
Parallels Working Group. The observations completed with no anomalous
activity.

1.6 Completed STIS/CCD 8865 (Bias Monitor-Part 2)

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

1.7 Completed WF/PC-2 9160 (Disks and Envelopes of Nearby Nebulous
Young Stellar Objects: A Snapshot Survey)

The WF/PC-2 was used to perform a snapshot survey of nearby
nebulous young stellar objects to study the detailed morphology of the
their disks and envelopes and probe the effect of inclination on the
infrared spectral energy distribution of disk/envelope systems. The
proposal completed as planned.

1.8 Completed FGS/1 9168 (The Distances to AM CVn Stars)

Fine Guidance Sensor (FGS) #1 was used to determine the parallaxes
and proper motions of the five brightest of the seven known AM CVn
systems. AM CVn systems are binaries where mass is transferred from a
completely hydrogen-deficient, degenerate mass donor to a white dwarf
primary through a helium accretion disk. A better understanding of these
systems is crucial for a number of reasons: (1) to study the late stages of
binary evolution, (2) to study the effect of chemical composition on the
physics of accretion discs, (3) to estimate their contribution to the
Supernovae Ia rate, and (4) to estimate their contribution to the
gravitational radiation background. All observations completed with no
reported problems.

1.9 Completed Two Sets of TIS/CCD 9066 (Closing in on the Hydrogen
Reionization Edge of the Universe)

The Space Telescope Imaging Spectrograph (CCD) was used in parallel
constrain the Hydrogen reionization edge in emission that marks the
transition from a neutral to a fully ionized IGM at a predicted
redshifts. The proposal completed uneventfully.

1.10 Completed WF/PC-2/STIS/CCD 8559 (The Role of Dark Matter in
Cluster Formation and Galaxy Evolution)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were
used to observe the outer regions of massive clusters that represent
transitional areas of great cosmological importance where field galaxies
encounter the steep potential wells of dark matter and baryonic hot
gas. Little is known about either the dark matter profile at large radii
or the morphological properties of infalling galaxies at those redshifts
where strong evolution is observed in the cluster cores. The proposal
completed normally, with no reported problems.

1.11 Completed STIS/MA1 8843 (Cycle 9 MAMA Dark Measurements)

The Space Telescope Imaging Spectrograph (MA1) was used to perform
the routine monitoring of the MAMA detector dark noise. The proposal
completed nominally.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions: 15

Successful: 15

Scheduled Re-acquisitions: 2

Successful: 2

2.2 FHST Updates:

Scheduled: 34

Successful: 34

2.3 Operations Notes:

Using ROP DF-18A, the 486 engineering status buffer limits were
adjusted twice.

The SSR EDAC error counter was cleared three times per ROP SR-1A.

The flight operations team remained at the STScI but real-time
operations transferred to CCS string “G” in preparation for GSFC Internal
Simulation #11 (EVA-5).

3.0 SIGNIFICANT FORTHCOMING EVENTS:

GSFC Internal Simulation #11 (EVA-5) will be conducted today for
approximately nine-and-one-half hours beginning at 8:00 a.m.

Continuation of normal science observations and calibrations.