HUBBLE SPACE TELESCOPE

       DAILY REPORT #3107

PERIOD COVERED:  0000Z (UTC) 05/01/02 - 0000Z (UTC) 05/02/02

Daily Status Report as of 122/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Two 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 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.

    1.3 Completed Five 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.

    1.4 Completed Two Sets of NICMOS/1/2/3 8944 (Filter Wheel/Mechanisms 
Mini-Functional Test)

        The Near Infrared Camera and Multi-Object Camera (NIC1, NIC2 and 
NIC3) was used to perform an early engineering test to verify the 
aliveness, functionality, operability, and electro-mechanical calibration 
of the NICMOS filter wheel motors and assembly.  This was the first use of 
the NICMOS filter wheel mechanisms since they were disabled by ground 
command in January, 1999.  This test was designed to obviate concerns over 
possible deformation or breakage of the fitter wheel "soda-straw" shafts 
due to excess rotational drag torque and/or bending moments which may be 
imparted due to changes in the dewar metrology from warm-up/cool-down.  No 
anomalous incident occurred.

    1.5 Completed Two Sets of STIS/MA2 8923 (FUV-MAMA Cycle 10 Flats)

        The Space Telescope Imaging Spectrograph (MA2) was used to obtain 
FUV-MAMA observations of the STIS internal Krypton lamp to construct an FUV 
flat applicable to all FUV modes.  No problems were encountered.

    1.6 Completed Two Sets of ACS/WFC/HRC 9075 (Cosmological Parameters 
from Type Ia Supernovae at High Redshift)

        The Advanced Camera for Surveys (WFC and HRC) was used to obtain a 
Hubble diagram of Type Ia supernovae {SNe Ia} that will be of long lasting 
value as a record of the expansion history of the universe.  No problems 
were encountered.

    1.7 Completed Seven Sets of WF/PC-2 9318 (POMS Test Proposal: WFII 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used to perform the generic target version of the 
WFPC2 Archival Pure Parallel program.  The program was used to take 
parallel images of random areas of the sky, following the recommendations 
of the Parallels Working Group.  There were no reported problems.

    1.8 Completed Two Sets of STIS/MA1 8922 (FUV-MAMA Cycle 10 Flats)

        The Space Telescope Imaging Spectrograph (MA1) was used to obtain 
FUV-MAMA observations of the STIS internal Krypton lamp to construct an FUV 
flat applicable to all FUV modes.  No problems were encountered.

    1.9 Completed Three Sets of NICMOS/1/2/3 8945 (Cooling System Monitoring)

        The Near Infrared Camera and Multi-Object Camera (NIC1, NIC2 and 
NIC3) was used 1) to measure NICMOS detector performance during the 
cool-down and steady state operation of the NCS. 2}. to demonstrate 
stability {+/-0.1K} of the NICMOS detector temperature at the optimal 
science operating temperature. and 3}.to demonstrate repeatability {+/-0.1 
K} of NICMOS detector temperature following changes from the optimal 
science operating temperature.  No problems were encountered.

    1.10 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.

    1.11 Completed WF/PC-2 9345 (Fundamental Properties of L-type Dwarfs in 
Binaries)

      The WF/PC-2 was used to characterize the physical properties of eight 
L-dwarfs in four binary systems.  The goal is to obtain astrometric, 
photometric and spectroscopic measurements of each component that will 
yield basic information on their atmospheric and dynamical properties.  All 
observations completed nominally.

    1.12 Completed ACS/WFC 9029 (Grism/Prism Performance Check)

        The Advance Camera for Surveys (WFC) was used to observe a 
Wolf-Rayet star and a White Dwarf the grism of both the Wide Field and 
eventually the High Resolution Channels to measure: 1} the dispersion of 
the grism and its field dependence; 2} the grism throughput and its field 
dependence; 3} the frequency of the flat field variation {L-flat} as a 
function of wavelength; 4} the fringe pattern at longer wavelengths as a 
function of position on the chip.  These measurements will be carried out 
at several positions on the chip including the centre and the corners of 
the WFC and HRC chips.  All observations completed without incident.

    1.13 Completed STIS/MA2 8920 (Cycle 10 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA2) was used to perform 
the routine monitoring of the MAMA detector dark noise, and is the primary 
means of checking on health of the MAMA detectors systems through frequent 
monitoring of the background count rate.  The proposal completed with no 
reported anomalous activity.

    1.14 Completed Four Sets of STIS/CCD 9317 (Pure Parallel Imaging 
Program: Cycle 10)

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
the default archival pure parallel program for STIS during cycle 10.  There 
were no reported problems.

    1.15 Completed Four Sets of ACS/WFC 9575 (Default {Archival} Pure 
Parallel Program)

        The Advanced Camera for Surveys (WFC) was used to test ACS pure 
parallels in POMS.  There were no reported problems.

    1.16 Completed Two Sets of WF/PC-2 9180 (Gamma-ray Burst Progenitors: 
Probing Their Environment)

        The WF/PC-2 was used to perform a target of opportunity observation 
of gamma ray burster (GRB), GRB-020405.   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.

    1.17 Completed STIS/CCD 9148 (Light Echos and the Nature of Type Ia 
Supernovae)

        The Space Telescope Imaging Spectrograph (CCD) was used to take 
STIS snapshot images of a subset of 43 well observed Type Ia supernovae 
{SNIa}, most of which have been discovered in late type galaxies over the 
last 40 years to make a systematic search for light echos around SN 
Ia.  STIS will also observe a sample of 10 SN II and SN Ib/c, which are 
believed to be the result of massive star core collapse and, therefore, to 
be thin-disk population objects, in order to make an empirical calibration 
of the accuracy of our method for determining scale heights.  The SN Ia 
sample will provide a direct as well as accurate estimate of the scale 
height of SN Ia which is an important clue to the progenitors of these 
events.  The proposal completed nominally.

    1.18 Completed STIS/CCD 9046 (Black Holes and Bars: A Recipe for Making 
Bulges?)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
multi-color images and (eventually) STIS emission line spectroscopy of the 
nuclear regions of 6 edge-on barred spiral galaxies spanning a range of 
bulge morphologies and bar strengths.  The goal is to quantify the amount 
of vertical heating in the nuclei, and to test whether or not bars are 
indeed destroyed and create a bulge if enough mass is accumulated in their 
centers.  There were no reported problems.

    1.19 Completed FGS/1 9240 (Astrometric Mass Determination of an 
Extrasolar Planet Candidate)

        Fine Guidance Sensor-1R was used to perform astrometric 
observations that will allow a quick measure of the sky-plane motion of 55 
Cancri, a G star with an Msin{i} = 0.9 MJ radial velocity companion with a 
14 day period.  By using 7 pairs of visits, where each visit within a pair 
has the same parallax factor, we will be able to accurately determine the 
stars's proper motion.  The reflex motion of the star, due to its orbit 
about the star-companion barycenter, will manifest itself as a systematic 
residual to the measured proper motion if the companion is sufficiently 
massive.  There were no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 10
    Successful: 10

  Scheduled Re-acquisitions:  4
    Successful:  4

    2.2 FHST Updates:
    Scheduled: 26
    Successful: 26

    2.3 Operations Notes:

        The following operations requests were performed during the day.
16750-0  Genslew Request for proposal 9110 slot 13.
16740-0  Enable Filter Wheel Move Day 121-2
16749-1  Clear ACS SBC Event Flag
16726-0  Configure Tasking Orders for FW Test
16727-1  Configure Tasking Orders after FW test activities
16741-0  Enable Filter Wheel Move Day 122-1

        The STIS MCE-2 reset at 121/105905Z while the low voltage was on 
and while outside any SAA interval.  Using ROP NS-12, the STIS flight 
software error counter was cleared at 121/105905Z.  MAMA-2 was recovered at 
122/0354Z, when high voltage on was initiated, via normal SMS commanding.

        The SSR-1 EDAC error counter was cleared at 121/1924Z per ROP SR-1A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

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

/CAW