HUBBLE SPACE TELESCOPE
DAILY REPORT #2465

PERIOD COVERED: 0000Z (UTC) 09/24/99 - 0000Z (UTC) 09/27/99
Daily Status Report as of 270/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed WF/PC-2 8199 (Local Cosmology: The Nearby Flow Field 
and its Structure)

   The WF/PC-2 was used to make observations of the galaxy 
UGC-4115 in order to study its nearby flow field and structure. Very 
little data are available to constrain the velocity field of galaxies 
in the local neighborhood {<= 500 km/sec}. The observations were 
executed as scheduled, and no anomalies were noted.

1.2 Completed Nine Sets of STIS/CCD 8406 (POMS Test Proposal: STIS 
Non-Scripted Parallel Proposal Continuation V)

   The Space Telescope Imaging Spectrograph (CCD) was used to 
make high galactic latitude observations taken in parallel with the 
prime science observations as part of a POMS proposal. This is a 
STIS non-scripted parallel Condition V proposal. The observations 
were completed as scheduled, and no anomalies were reported.

1.3 Completed Six Sets of STIS/CCD 8408 (STIS CCD Dark Monitor C8)

   The Space Telescope Imaging Spectrograph (CCD) was used to 
make a CCD bias calibration observation. This is to monitor the 
darks for the STIS CCD. The observations were executed as scheduled, 
and no anomalies were reported.

1.4 Completed Eight Sets of WF/PC-2 8443 (WF/PC-2 Cycle-8 
Supplemental Darks pt1/3)

   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 observations were completed as planned, and no problems 
were reported.

1.5 Completed Three Sets of WF/PC-2 8345 (Multipolar Bubbles and 
Jets in Very Low Excitation Planetary Nebulae - A WF/PC-2 H-Alpha 
Imaging Survey)

   The WF/PC-2 was used to make H-Alpha observations of the very 
low excitation planetary nebulai PK235-01D1, PK300-02D1 and 
PK023-02D1 in order to study their multipolar bubbles and jets. 
Comparison of the morphology of this young PNe sample with more 
evolved PNe populations will set new constraints on models for the 
production of jet-like outflows and nebular evolution. The 
observations were completed as planned, and no problems were 
reported.

1.6 Completed Three Sets of STIS/CCD 8409 (STIS CCD Bias Monitor C8)

         The Space Telescope Imaging Spectrograph (CCD) was used to 
make a CCD bias calibration observation. This is to monitor the bias 
in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at gain 
= 4, to build up high-S/N superbiases and to track the evolution of 
hot columns. The observations were executed as scheduled, and no 
anomalies were reported.

1.7 Completed WF/PC-2 8314 (Star Clusters of NGC 6822)

     The WF/PC-2 was used to make observations of the star clusters 
located in the irregular local group galaxy NGC-6822. The goals are: 
{1} to measure the oldest population of stars in the field to answer 
the question of when star formation commenced in this galaxy; {2} to 
ascertain the nature of the star formation history of the galaxy; and 
{3} to look for evidence of a halo population of old stars. The 
observations were executed as scheduled, and no anomalies were noted.

1.8 Completed Two Sets of STIS/CCD 7912 (STIS Parallel Archive 
Proposal - Nearby Galaxies - Imaging and Spectroscopy)

            The Space Telescope Imaging Spectrograph (CCD) was used to 
make parallel observations of nearby galaxies. This survey will be 
useful to study the star formation histories, chemical evolution, and 
distances to these galaxies. These data will be placed immediately 
into the Hubble Data Archive. The observations were completed as 
scheduled, and no problems were reported.

1.9 Completed Three Sets of WF/PC-2 8457 (UV Earthflats)

         The WF/PC-2 was used to make a ultraviolet Earth flat 
calibration image. This is to improve the quality of pipeline the 
ultraviolet flatfields. The observations were completed as 
scheduled, and no problems were reported.

1.10 Completed Two Sets of FGS 8309 (A Link Between Massive Binary 
Stars and Non-thermal Radio Emission)

             The Fine Guidance Sensors were used to make astrometric 
observations of the massive Wolf-Rayet binary stars WR44 and WR140, 
plus several nearby reference stars. Non-thermal radio emission in 
Wolf-Rayet stars is explained in terms of synchrotron emission from 
shocks in the stellar wind. The observations were executed as 
scheduled, and no anomalies were noted.

1.11 Completed six Sets of WF/PC-2 8090 (POMS Test Proposal: WF-II 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used in the parallel mode to make some low 
galactic latitude archive observations. The program will be used to 
take parallel images of random areas of the sky. The observations 
were executed as scheduled, and no anomalies were noted.

1.12 Completed STIS/CCD/MA2 8197 (Detection of ^11B/^10B: Part II)

           The Space Telescope Imaging Spectrograph (CCD and MA2) was 
used to make spectrographic observations of star HDD160617 to measure 
the boron isotope ratio (i.e., 11B/10B). See Section 3.0 of this 
report.

1.13 Completed STIS/CCD/MA1 8241 (A Snapshot Survey of 
Interstellar Absorption Lines)

          The Space Telescope Imaging Spectrograph (CCD and MA1) was 
used to make high resolution Echelle spectrographic observations of 
the standard ultraviolet star HD142315 as part of a snapshot survey 
of interstellar absorption lines. A wavelength calibration image was 
also taken. The observations were executed as scheduled, and no 
anomalies were noted.

1.14 Completed WF/PC-2 8134 (Is the IMF Universal at Low Stellar Masses?)

     The WF/PC-2 was used to make observations of the NGC-216 
(a.k.a., LMC cluster R-136). Only the HST can provide the resolution 
and limiting magnitude required to reach the low-mass end of the IMF 
at extragalactic distances. The observations were executed as 
scheduled, and no problems were reported.

1.15 Completed Two Sets of STIS/CCD 8545 (POMS Test Proposal: STIS 
non-scripted parallel proposal continuation VI)

              The Space Telescope Imaging Spectrograph (CCD) was used to 
make low galactic latitude, non-scripted parallel observations as 
part of a POMS test proposal. The observations were completed as 
planned, and no anomalies were reported.

1.16 Completed Three Sets of STIS/CCD 8410 (STIS CCD Hot Pixel Annealing C8)

            The Space Telescope Imaging Spectrograph (CCD) was used to 
assess the effectiveness of the CCD hot pixel annealing process by 
measuring the dark current behavior before and after annealing and by 
searching for any window contamination effects. In addition CTE 
performance is examined by looking for traps in a low signal level 
flat. The observations were completed as planned, and no anomalies 
were reported.

1.17 Completed WF/PC-2 7371 (The White Dwarf Luminosity Function in NGC 188)

          The WF/PC-2 was used to study the white dwarf luminosity 
function in the old open cluster NGC-188. These data will be one of 
the first "complete" samples of white dwarfs {in the sense of 
containing stars from the full cooling sequence} all at a known 
distance, with similar compositions and derived from a fairly well 
understood initial mass distribution. The observations were executed 
as scheduled, and no anomalies were noted.

1.18 Completed WF/PC-2 8301 (A Snapshot Survey of X-ray Selected 
Central Cluster Galaxies)

               The WF/PC-2 was used to make snapshot survey observations of 
the x-ray, central cluster galaxy A2261. Central cluster galaxies 
are the most massive stellar systems known and have been used as 
standard candles for many decades. The observations were executed as 
scheduled, and no anomalies were noted.

1.19 Completed WF/PC-2 6752 (Global Mapping of the Opposition 
Surge on the Galilean Satellites)

               The WF/PC-2 was used to make observations of Jupiter's moons 
Ganyemede, Io, Europa and Callisto. This is to construct ~200 km 
resolution global maps of the opposition brightness surge for each of 
the four Galilean satellites to support and complement Galileo 
mission science investigations. The observations were executed as 
scheduled, and no anomalies were noted.

1.20 Completed Two Sets of WF/PC-2 6671 (Deep V, I Photometry for 
20 M31 Globular Clusters)

                The WF/PC-2 was used to make deep photometry observations 
(V=27.5) of the globular clusters M-31-G11 and M-31-G287 which are 
located in the Andromeda Galaxy (a.k.a., M-31). The observations 
were executed as planned, and no problems were reported.

1.21 Completed WF/PC-2/STIS/CCD 8169 (HST-Galileo Io Campaign)

          Both the WF/PC-2 and the Space Telescope Imaging Spectrograph 
(CCD) were used to make observations of Jupiter's moon Io. Io plays 
a central role in the Jovian system, yet the mechanisms that couple 
its volcanoes, the tenuous atmosphere, the escaping corona and the 
plasma torus remain elusive. In 1999 there is the unique opportunity 
to combine HST observations with the Galileo close flybys of Io. A 
wavelength calibration image was also taken. The observations were 
completed as planned, and no problems were reported.

1.22 Completed STIS/CCD 8238 (Collimated Jets and Low Velocity 
Forbidden Emission from T Tauri Stars)

               The Space Telescope Imaging Spectrograph (CCD) was used to 
make observations of the T-Tauri class star UZ-Tau and to study its 
collimated jets and low velocity forbidden emission lines. This is a 
program of slitless spectroscopy to image both the low velocity 
component {LVC} and high velocity component of forbidden line 
emission in single and binary low mass stars undergoing disk 
accretion. A calibration CCD flat image was also taken. The 
observations were executed as scheduled, and no anomalies were noted.

1.23 Completed WF/PC-2 8268 (Lensed Quasar Hosts at High Redshift)

              The WF/PC-2 was used to make observations of the high 
redshift, lensed quasar B1600+434. Gravitational lensing offers a 
novel way to detect quasar host galaxies at z > 1 and to measure 
their properties. The observations were completed as scheduled, and 
no anomalies were reported.

1.24 Completed WF/PC-2 8192 (A Snapshot Survey of Probable Nearby Galaxies)

            The WF/PC-2 was used to make a snapshot survey images of a 
probable nearby galaxy KK091. The census of galaxies in the Local 
Volume of space is very incomplete, particularly at the faint end. 
The observations were executed as scheduled, and no anomalies were 
noted

1.25 Completed STIS/CCD/MA1 7481 (The Wind-momentum Luminosity 
Relationship for M31 and M33 B-supergiants)

            The Space Telescope Imaging Spectrograph (CCD and MA1) was 
used to make observations of the B class supergiant star M-31-OB78-1 
which is locate in the M-31 galaxy. The purpose of these 
observations is to acquire STIS low-resolution ultraviolet spectra 
of early B-supergiants in galaxies M31 and M33 to determine the 
terminal velocities of their stellar winds.

             There was a guide star acquisition (1,3,1) which went to Fine
Lock 
(FL) back-up on FGS #1 (1,0,1) at 269/1129Z. The event occurred 
during a ZOE. The subsequent Guide Star acquisition (1,3,1) also 
resulted in Fine Lock back-up. HSTAR #7279 was written. No other 
anomalies were reported.

1.26 Completed WF/PC-2 8059 (POMS Test Proposal: WF-2 Targeted 
Parallel Archive Proposal)

            The WF/PC-2 was used to make observations in parallel with the 
prime science observations. The parallel opportunities available 
with WF/PC-2 in the neighborhood of bright galaxies are treated in a 
slightly different way from the normal pure parallels. Local group 
galaxies offer the opportunity for a closer look at young stellar 
populations. The observations were completed as planned, and no 
anomalies were reported

1.27 Completed STIS/CCD/MA2 8342 (Abundances in Halo Stars and 
Galactic Element Formation)

                 The Space Telescope Imaging Spectrograph (MA1 and CCD) was 
used to make observations of star HD6755 as part of a study of the 
abundances in halo stars and galactic element formation. The results 
for the very oldest galactic stars will also provide an important, 
and independent, age determination for the Galaxy and hence constrain 
cosmological age estimates. See Section 3.0 of this report.

1.28 Completed WF/PC-2 8216 (T Tauri Star Snapshot Survey II. 
Completing the CTTs Sample)

                 The WF/PC-2 was used to make observations of the Y-Tauri
class 
star known as Reipurth-4 as part of Snapshot Survey II. This 
database will be of fundamental importance to understanding the 
nature of planet-forming environments and their frequency in the 
galaxy. The observations were executed as scheduled, and no 
anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

        Scheduled Acquisitions: 22 
        Successful: 22

        There was a guide star acquisition (1,3,1) which went to Fine Lock 
(FL) back-up on FGS #1 (1,0,1) at 269/1129Z. The event occurred 
during a ZOE. The subsequent Guide Star acquisition (1,3,1) also 
resulted in Fine Lock back-up. HSTAR #7279 was written. See 
Observations Item 1.25 in this report.

        Scheduled Re-acquisitions: 21 
        Successful: 21

2.2 FHST Updates:

        Scheduled: 61 
        Successful: 61

2.3 Operations Notes:

            Battery 2,3 and 4 Voltages were flagged Out-of-Limits (OOL) 
Low (27.63) at 269/2012Z. The event occurred as the spacecraft came 
out of an eclipse. All three batteries were back in bounds at 
269/2013Z. HSTAR #7280 was written.

            There was a real-time non-recoverable engineering data lose at 
269/0338Z through 0355Z due to White Sands Ground terminal (WSGT) 
equipment problems. TTR #21399 was written.

               The NICMOS FPA temperature sensor Detector #1 was enabled at 
268/0220Z (OR 14293).

                The correctable EDAC errors were cleared three times. (ROP
SR-1).

3.0 SIGNIFICANT FORTHCOMING EVENTS:

                  The Space Telescope Imaging Spectrograph (STIS MAMA #2)
recovery 
will be executed in incremental steps. The MAM 2 Low Voltage (LV) 
turn-on, engineering data collection and STIS Event Flag 3 will be 
set by SPC on Day 270. Partial High Voltage slow ramp-up to -175 
Volts followed by ramp-down, and STIS Event Flag 3 set by SPC on Day 
271. The full HV ramp-up and the Fold Test on Day 273, and Normal 
MAMA HV on Day 274. Status meeting (TELECON) are scheduled to occur 
between each step.

              Continuation of normal science observations and calibrations.

/DMH