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Daily #4057



 
 
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Old February 24th 06, 02:37 PM posted to sci.astro.hubble
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Default Daily #4057

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT #4057

PERIOD COVERED: UT February 23, 2006 (DOY 054)

OBSERVATIONS SCHEDULED

ACS/HRC 10738

Earth Flats

Sky flats will be obtained by observing the bright Earth with the HRC
and WFC. These observations will be used to verify the accuracy of the
flats currently in the pipeline and to monitor any changes. Weekly
coronagraphic monitoring is required to assess the changing position
of the spots.

ACS/HRC 10752

Cycle 14 Focus Monitor

The focus of HST is measured primarily with ACS/HRC over full CVZ
orbits to obtain accurate mean focus values via a well sampled
breathing curve. Coma and astigmatism are also determined from the
same data in order to further understand orbital effects on image
quality and optical alignments. To monitor the stability of ACS to
WFPC2 relative focii, we've carried over from previous focus monitor
programs parallel observations taken with the two cameras at suitable
orientations of previously observed targets, and interspersed them
with the HRC CVZ visits.

ACS/WFC 10574

Witnessing Galaxy Transformation in Galaxy Groups at z 1

The recent discover of five galaxy groups in the Lynx supercluster
region offers us the exciting opportunity to observe for the first
time groups in the process of collapsing into a merging pair of
clusters at z 1. Our current picture of structure formation suggests
that substantial evolution of galaxy properties can occur in groups
and filaments well before they enter the environs of massive clusters.
However, neither current theoretical models nor observations give us a
complete understanding of the relative importance of the different
physical processes that control the structural and spectral
transformations that occur prior to, during, and after infall into a
dense environment. We propose direct observation of these newly
discovered dynamically young structures in the Lynx region, in order
to provide a critical benchmark in testing not only whether galaxy
evolution occurs mostly prior to entry into the densest regions but
will also constrain the relative importance of initial conditions in
determining the fate of galaxy systems. Our analysis of these proposed
ACS measurements will be complemented with an unique dataset we have
already in the optical, infrared, mid-infrared, and X-ray.

WFPC2 10779

WFPC2 WF4 Temperature Reduction Test #2

A serious anomaly has been found in images from the WF4 CCD in WFPC2.
The WF4 CCD bias level appears to have become unstable, resulting in
sporadic images with either low or zero bias level. The severity and
frequency of the problem is rapidly increasing, and it is possible
that WF4 will soon become unusable if no work-around is found. The
other three CCDs {PC1, WF2, and WF3} appear to be unaffected and
continue to operate properly. This is a second test to further reduce
temperatures. Orbits: internal 26, external 1

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated.)

HSTARS:

10145 - Reacq (2,1,2) drops lock @055/0927z

Reacq(2,1,2) scheduled at 055/09:19:14 reached finelock at 09:26:17
but dropped lock at 09:26:47. The Map at 09:26:28 showed errors of
V1=-3.72, V2=-1.26, V3=4.55, and RSS= 6.01.


COMPLETED OPS REQUEST:
17657-1 - Increase Benchmark SOC @054/2254z

COMPLETED OPS NOTES: (None)

SCHEDULED SUCCESSFUL FAILURE TIMES
FGS GSacq 07 07
FGS REacq 07 06 055/0927z
(HSTAR 10145)
OBAD with Maneuver 18 18

SIGNIFICANT EVENTS:

Benchmark SOC Adjustment Flash Report

On DOY 2006/054 at 22:53 GMT, the EPS Benchmark SOC was successfully
increased from 241A-hr to 246 A-hr via Ops Request 17657-1. EPS SE
observed the expected step increase of the FSW SOC by 5 A-hr upon
uplink of the new benchmark value and that the FSW SOC tracks more
closely with the pressure-based SOC. The EPS system was monitored for
one orbit cycle and nominal system performance was verified with the
BRT satisfied ~37 minutes into orbit day and the benchmark SOC reset
at 246 A-hr.


 




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