HUBBLE SPACE TELESCOPE
DAILY REPORT #2445
PERIOD COVERED: 0000Z (UTC) 08/26/99 - 0000Z (UTC) 08/27/99

Daily Status Report as of 239/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

1.1 Completed Two 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.

1.2 Completed FGS 7677 (Monitor the Long Term Stability of FGS-3)

The goal of these measurements is to monitor the internal 
positional stability of FGS3 by measuring star OF957 (and other 
stars) in the M35 check field repeatedly over a one year period. The 
results of these measurements are the stability characteristics of 
FGS3 which allow an estimate of differential corrections to OFAD and 
plate scale. The measurements were completed as scheduled, with no 
reported anomalies.

1.3 Completed Three 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.

1.4 Completed Five Sets of STIS/CCD 8202 (Bright Quasar Close 
Lensing Search)

The Space Telescope Imaging Spectrograph (CCD) was used to 
make observations of HCLQ0412-3, HCLQ0405-2, HCLQ0514-3, HCLQ2232-3 
and HCLQ0055-3 as part of a second generation survey to search for 
bright lensing quasars. With the restored PSF, new images will be 
considerably more sensitive to the presence of both close separation 
and faint lens components, and because STIS reaches two magnitudes 
fainter the PC, the new snapshot images will have much greater 
dynamic range. The observations were executed as scheduled, and no 
anomalies were noted.

1.5 Completed 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.

1.6 Completed WF/PC-2 8332 (A Snapshot Survey of Symbiotic Stars)

The WF/PC-2 was used to make observations of the star HD149427 
(a.k.a., RTSER) as part of a snapshot survey of symbiotic stars. A 
fuller understanding of the symbiotic star phenomenon is important to 
several branches of present day astrophysics including mass loss, 
accretion onto compact objects, and photoionization and radiative 
transfer in gaseous nebulae. The observations were completed as 
planned, and no anomalies were reported.

1.7 Completed Three 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.

1.8 Completed STIS/CCD/MA1/MA2 7764 (Activity on the Edge of 
Convection: The Atmosphere of Canopus {F0 Ib-II})

The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) 
was to be used to make observations of the star Canopus (a.k.a., 
HD45348 or Alpha Car), the nearest {96 pc} supergiant star. As 
described in HSTAR 7235 and yesterday's report, the guide star 
acquisition/re-acquisitions for this proposal failed and the take 
data flag remained down.

1.9 Completed WF/PC-2 8436 (POMS Test Proposal: WFII Backup 
Parallel Archive Proposal II)

The WF/PC-2 was to be used to make archive observations 
parallel to the prime science observations as part of a POMS test 
proposal. As described in HSTAR 7235 and yesterday's report, the 
guide star acquisition/re-acquisitions for this proposal failed and 
the take data flag remained down.

1.10 Completed WF/PC-2 8444 (WF/PC-2 CYCLE-8 Internal Monitor)

The WF/PC-2 was to be used to make a bias, and an internal 
flat, observation as part of a Cycle-8 monitoring program to monitor 
the health of the cameras. As described in HSTAR 7235 and 
yesterday's report, the guide star acquisition/re-acquisitions for 
this proposal failed and the take data flag remained down.

1.11 Completed WF/PC-2 7306 (Halo Microlens Source Systems and 
their Underlying Stellar Backgrounds)

The WF/PC-2 was used to obtain medium-deep broadband images of 
star STAR-0526 for microlensing events, plus one additional star, to 
determine a} which star was actually lensed, b} the amount of 
crowding in our ground-based frames, c} if the stars are normal in 
the CMD, and d} if they lie preferentially at the back of the LMC. 
The proposal completed with no reported problems.

1.12 Completed STIS/CCD 8226 (Discerning the Origins of Blue 
Stragglers: Masses and Rotation Rates)

The Space Telescope Imaging Spectrograph (CCD) was used to 
study the blue stragglers in globular cluster NGC-104. Conventional 
wisdom holds that the masses of Blue Straggler Stars in globular 
clusters are significantly larger than the turnoff mass. A 
wavelength calibration observation was also taken. The observations 
were executed as scheduled, and no anomalies were noted.

1.13 Completed 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 nebula PK010-06D1 in order to study its 
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.

1.14 Completed WF/PC-2/STIS/CCD 7496 (Star Formation Histories of 
Dwarf Irregular Galaxies II: the Old Populations of IC 1613 and 
Sextans A)

The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) 
were used to make observations of the dwarf irregular galaxy IC1613. 
Recent results from the ground and from HST for different types of 
dwarf galaxies show that even in these apparently simple stellar 
systems, a variety of different star formation histories can be 
found. The observations were executed as scheduled, and no anomalies 
were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions: 13 
Successful: 12

A Guide Star Acquisition (3,0,3) failed to RGA control. FGS 3 
stop flag was set. Observations 103 and 104 were affected by this 
anomaly. HSTAR #7238 was written.

A Guide Star Acquisition (1,3,3) at 238/1347Z resulted in an 
out of limits saved error null bias value of 1457.881. Both FGSs 
acquired and the acquisition was successful. PASSOPS was not able to 
incorporate FGS data into the Fine Attitude Determination scheduled 
for 1408Z. HSTAR 7236 was written.

The Guide Star Acquisition at 238/0320Z failed to search 
radius limit exceeded on FGS3, and continues to attempt up until the 
term exp. command at 0430Z STIS710 status buffer message followed the 
failed acquisition (routine). The three following Reacqusitions at 
0458Z, 0635Z, and 0811Z also failed. HSTAR 7235 was written.

Scheduled Re-acquisitions: 6 
Successful: 6

2.2 FHST Updates:

Scheduled: 26 
Successful: 26

2.3 Operations Notes:

The Fight Operations Team (FOT) in Building #23 at 235/2000Z 
on CCS "A" Ops. Switch at 237/2120Z to CCS-G Real/Time Ops.
Correctable EDAC Errors were cleared four times (SR-1)

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH