HUBBLE SPACE TELESCOPE

       DAILY REPORT #3089

PERIOD COVERED:  0000Z (UTC) 04/05/02 - 0000Z (UTC) 04/08/02

Daily Status Report as of 098/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Five 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 Ten 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 WF/PC-2 9039 (Getting to the Core of The Matter: The 
Inner Region of M15)

        The WF/PC-2 was used to measure the velocity dispersion profile 
within 15 arcseconds of the core of M15 to determine whether the mass 
distribution in this region is best fit by the presence of a Black Hole or 
by a more extended distribution of mass.  Three models of the core region 
will be tested {1} a massive Black Hole, {2} a more extended distribution 
of neutron stars, or {3} is in the process of core collapse.  All 
observations completed nominally.

    1.4 Completed WF/PC-2 9060 (Photometry of a Statistically Significant 
Sample of Kuiper Belt Objects)

        The WF/PC-2 was used to propel the physical study of KBOs forward 
by performing accurate photometry at V, R, and I on a sample of up to 150 
KBOs.  The sample is made up of objects that will be observed at thermal 
infrared wavelengths by SIRTF and will be used with those data to derive 
the first accurate diameters and albedos for a large sample of KBOs.  The 
observations completed nominally.

    1.5 Completed Three Sets of 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.

    1.6 Completed Nine 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.

    1.7 Completed Four Sets of STIS/CCD 9088 (Next Generation Spectral 
Library of Stars)

        The Space Telescope Imaging Spectrograph (CCD) was used to produce 
a "Next Generation'' Spectral Library of 600 stars for use in modeling the 
integrated light of galaxies and clusters by using the low dispersion UV 
and optical gratings of STIS.  The library will be roughly equally divided 
among four metallicities, very low {Fe/H < -1.5}, low {-1.5 < Fe/H < -0.5}, 
near-solar {-0.5 < Fe/H < 0.1}, and super-solar {Fe/H > 0.1}, well-sampling 
the entire HR-diagram in each bin.  Such a library will surpass all extant 
compilations and have lasting archival value, well into the Next Generation 
Space Telescope era.  No problems occurred.

    1.8 Completed Thirty-two Sets of STIS/CCD 8910 (Sparse Field CTE 
Test-Internal {Cycle 10})

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
CTE measurements that are made using the "sparse field test", along both 
the serial and parallel axes.  This program needs special commanding to 
provide {a} off-center MSM positionings of some slits, and {b} the ability 
to read out with any amplifier {A, B, C, or D}.  No problems were encountered.

    1.9 Completed Five Sets of 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.

    1.10 Completed Two Sets of ACS/HRC/WFC 9028 (CCD Geometric Distortion)

        The Advanced Camera for Surveys (HRC and WFC) was used to measure 
the geometric distortion of the WFC and HRC detectors using multiple 
pointing observations of globular cluster 47 Tucanae , thus imaging 
moderately dense stellar fields.  Centroid position of stars will be used 
to tie down the geometric distortion to about 0.2 pixels across the field 
of each detector.  These high quality baseline measurements of the 
distortion will be ideal for diagnosing any temporal variations in later 
calibration campaigns.  No problems were encountered.

    1.11 Completed Three Sets of FGS/1/2 8995 (Verification of Operational 
FGS Calibrations)

        Fine Guidance Sensors #1 and #2 were used to monitor the 
characteristics of HST's Fine Guidance Sensors across the boundary of the 
servicing mission SM3B and compares the data with pre-SM3B baseline 
characterizations.  For each FGS, stars from a selected field in the 
standard astrometric Galactic cluster M35 are observed in Position 
mode.  This provides a measurement of their relative positions, which in 
turn provides an effective means to detect and monitor any changes in the 
FGS optical distortions and plate scales.  These observations will obtain 
S-curves at the center of each FGS FOV.  If changes larger than tolerance 
are observed, it will be necessary to activate the appropriate contingency 
proposal that will obtain data for new S-curves.  These data will also be 
used to re-compute the optimal values of parameters, or K-factors, that are 
used in the acquisition and tracking of guide stars {and astrometry 
targets}.  The proposal completed with no reported problems.

    1.12 Completed ACS/HRC/WFC 9015 (CCD Image Quality Verification)

        The Advanced Camera for Surveys (HRC and WFC) was used to obtain a 
series of images to evaluate the point source image quality over the fields 
of view of the ACS HRC and WFC channels in normal imaging 
{non-coronagraphic} mode, after the corrector mechanisms have been used to 
optimize the image focus and symmetry.  A moderate density open cluster, 
NGC-188, will be the target, since it is available year-round and has 
suitable density and magnitude distribution.  Images will be obtained in 
the F502N and F625W filters, with 0.5 px dithers in each axis of the WFC to 
improve PSF sampling.  Larger {~10 arcsec} POS-TARG offsets will be used to 
improve the sampling over the HRC field, while maintaining mean star 
separation {>5 arcsec} adequate for PSF evaluation to a reasonable 
radius.  The proposal completed with no reported problems.

    1.13 Completed Two Sets of STIS/CCD 9180 (Gamma-ray Burst Progenitors: 
Probing Their Environment)

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
a target of opportunity observation of gamma ray burster (GRB), 
GRB-020127.   GRB astronomy is a field maturing at a phenomenal 
rate.  Three important new observational and theoretical discoveries, 
formulated over the last twelve months, allow the proposer to address new, 
and in many cases, more sophisticated questions than could have been posed 
previously.  These developments: the discovery of X-ray lines in GRB 
991216; the observation that N_H as deduced from X-ray afterglow are one to 
two orders of magnitude larger than the dust extinction inferred from 
optical afterglow; and the growing realization that the afterglow emission 
may exhibit features of dust echoes, appear to offer unexpected and new 
diagnostics that will directly inform us about the progenitor, the 
circum-progenitor material and the immediate interstellar environs.  There 
were no reported problems.

    1.14 Completed Eight Sets of WF/PC-2 8952 (SM3B Flat Field Calibration)

        The WF/PC-2 was used to check for changes in flat field using 
external earth flat fields.  No problems were encountered.

    1.15 Completed STIS/CCD 9239 (Absolute Proper Motions of Nearby Dwarf 
Spheroidal Galaxies-Cycle 10)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
precise absolute proper motions for four dwarf spheroidal satellites of the 
Milky Way using spectroscopically-confirmed background QSOs to define a 
zero- velocity reference frame.  The proposal completed with no reported 
problems.

    1.16 Completed Two Sets of FGS/1 9034 (The Masses and Luminosities of 
Population II Stars)

        Fine Guidance Sensor #1 was used to observe the mass-luminosity 
relation {MLR} of Population II stars of which very little is currently 
known.  With the advent of the Hipparcos Catalogue, improved distances to 
many spectroscopic binaries known to be Pop II systems are now 
available.  After surveying the literature and making reasonable estimates 
of the secondary masses, we find 13 systems whose minimum separation should 
be larger than the resolution limit of FGS #1.  The observations completed 
nominally.

    1.17 Completed Two Sets of ACS/WFC/HRC 8992 (ACS Early Release 
Observations)

        The Advanced Camera for Surveys (WFC and HRC) was used to perform 
early release observations {ERO}, employing a variety of instruments to 
demonstrate the new capabilities.  The observations (not all in this 
iteration) will include: 1} WFC observations of peculiar galaxies NGC 4676 
{The Mice} and UGC 10214.  This will be used to study young stellar 
clusters formed through the process of galaxy interaction.  Any dark 
companion to UGC 10214 will also be searched for in sensitive ACS/WFC 
observations. 2} Emission line and continuum imaging of the Cone Nebula and 
M 17 with WFC to demonstrate the improved sensitivity and angular 
resolution of ACS. 3} Coronagraphic imaging of HD 141569, a main sequence 
star with circumstellar disk. 4} Coronagraphic imaging with the HRC of the 
nearby quasar 3C 273 to investigate the physical properties of the host 
galaxy and environments.  There were no reported problems.

    1.18 Completed STIS/CCD 9486 (What Excites LINERs: The Brilliant Case 
of NGC 3998)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
LINER emission that is now known to occur in many galaxies at a variety of 
levels, with causes as diverse as old nuclear starbursts, cooling flows, 
accretion disks, and jets.  The early prototypes, including NGC 3998, 
belong to a distinct class of AGN-like LINERs with the most luminous line 
emission and powerful nuclear radio emission.  These LINERs have ionized 
gaseous disks on the scale of tens of parsecs, which have now been found to 
be in rotation about supermassive black holes.  The disks are apparently 
the outer parts of energy- releasing accretion disks.  Powerful new 
UV+optical emission line diagnostics have been developed to settle the 
long- standing debate over whether the gas is being photoionized or shock 
excited.  There was no anomalous activity.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 24
    Successful: 24

  Scheduled Re-acquisitions: 22
    Successful: 22

    2.2 FHST Updates:
    Scheduled: 56
    Successful: 56

    2.3 Operations Notes:

        The NICMOS Cryo Cooler (NCS) cool down continues nominally.  As of 
Sunday morning, the NICMOS Outlet Temperature (MNPNCOLT) was 91.99K 
(expected end point 76K), the NCC TA Inlet Temperature (MNPTAILT) was 
75.18K (expected end point 68K), the CLI Temperature (MNPLINTT) was 79.50K 
(expected end point 71K), and the NICMOS Inlet Temperature (MNRNCILT) was 
70.19K (expected endpoint 63K).

        During this weekend, the following operations notes were invoked:
                 Limit Management during WF/PC-2 decontamination
                 Change limits for MCE-2 reset detection
                 Adjust STIS OTCCZ3BT limits

        An operations request was executed at 095/1814Z to inhibit MAMA-1 
turn-on (ramp-up scheduled just after the period of this report).

        The TRSWCC relay command stack was re-ordered at 095/1924Z per an 
operations request.

        Using ROP IC-2, SSA transmitter #2 was turned on for the intervals 
095/1409Z to 095/1438Z and from 096/0119Z to 096/0148Z.

        The STIS MCE-2 reset at 095/181430Z while outside any SAA interval 
and while the low voltage was on.  MAMA-2 will be recovered at the next 
time that high voltage is commanded in the SMS.

        The SSR-1 EDAC error counter was cleared at 096/1253Z per ROP SR-1A.

        The mnemonic JWCK4P5 (WF/PC CEB Clock 4 +5v) flagged out-of-limits 
high at 096/150854Z with a value of 5.23447 volts.  The parameter returned 
into normal ranges at 096/150954Z.  HSTAR 8596 was written.

        The 486 engineering status buffer limits were adjusted for SESBSLD 
at 096/1615Z and at 096/1638Z, using ROP DF-18A.

        Per ROP SR-9A, the SSR-3 EDAC error counter was cleared at 097/1243Z.

        SI C&DH errors were reset at 097/1245Z and at 097/1710Z according 
to ROP NS-5.

        A TTR was written for a required re-transmit at 097/1702Z during a 
NSSC-1 load.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

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

/CAW