HUBBLE SPACE TELESCOPE

       DAILY REPORT #3088

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

Daily Status Report as of 095/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Three 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.

    1.2 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.

    1.3 Completed Two 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.

    1.4 Completed Two 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.

    1.5 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.

    1.6 Completed FGS/1 9237 (The Masses of the O-type Binary 15 Monocerotis)

        Fine Guidance Sensor #1 was used to observe the O-type star 15 Mon 
{HD 47839} that was recently discovered to be an astrometric and 
spectroscopic binary with an orbital period of 25 years.  It is the first 
known O-star system to bridge the observational gap between the period 
regimes normally probed by these techniques.  The observations completed 
with no reported problems

    1.7 Completed STIS/CCD 9147 (Probing The Structure Of The Shocks In The 
Narrow Line Region Of M 51)

        The Space Telescope Imaging Spectrograph (CCD) was used to 
determine whether nuclear or shock-induced photoionization dominates the 
gaseous ionization in the narrow-line region {NLR} of LINERs and Seyfert 
galaxies.  A critical issue is the determination of the input of mechanical 
energy in the NLR through jet/ISM interactions.  Previous studies suggest 
that the latter could actually suffice to power the NLR in most Seyfert 
galaxies.  Previous approaches to this problem have obtained integrated 
UV/visible line flux ratios, which are sensitive to uncertain 
reddening.  It is now proposed to map several spectral lines across the 
shock/precursor complex in the spatially extended, jet-driven NLR of the 
nearby Seyfert 2 galaxy M 51, measuring the spatial distribution of 
kinematic subsystems, the ionization structure, and the gaseous density, 
across this structure.  All observations completed nominally.

    1.8 Completed 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.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  7
    Successful:  7

  Scheduled Re-acquisitions: 10
    Successful: 10

    2.2 FHST Updates:
    Scheduled: 16
    Successful: 16

    2.3 Operations Notes:

        The NICMOS Cryo Cooler (NCS) cool down continues nominally.  As of 
yesterday morning, the NICMOS Outlet Temperature (MNPNCOLT) was 104K 
(expected end point 76K), the NCC TA Inlet Temperature (MNPTAILT) was 83K 
(expected end point 68K), the CLI Temperature (MNPLINTT) was 88K (expected 
end point 71K), and the NICMOS Inlet Temperature (MNRNCILT) was 78K.  Per 
operations requests, the NCS CPL minimum value was set to 12 at 094/1550Z, 
the min/max collection for the NCS post-surge period was re-configured at 
094/1937Z, and the 8051 flight software end-of-surge value was set to 82 at 
094/1938Z.

        The STIS MCE-1 reset at 094/204158Z while the low voltage was on 
and while outside any SAA interval.  MAMA-1 will be recovered via SMS 
commanding when the high voltage is turned on.  Per ROP NS-12, the STIS 
flight software error counter was cleared at 094/204158Z.

        An operations note was utilized to change the MAMA threshold 
voltage limits.

        A TTR was written when there was a required re-transmit at 
095/0916Z during an NSSC-1 load.  SI C&DH errors were reset at 095/0922Z 
per ROP NS-5.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

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

/CAW