HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1858

PERIOD COVERED:  0000Z (UTC) 04/16/97 - 0000Z (UTC) 04/17/97

Daily Status Report as of 107/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed NIC/2/3 7053 (NICMOS Limb Avoidance Determination)

       The Near Infrared Cameras (Cameras Two and Three) were used to =
make limb avoidance determination observations.  The purpose of this test =
is to determine the appropriate bright and dark Earth limb avoidance =
angles for NICMOS science observations.  Angles for both routine and =
low-background observations were be determined.  The observations were =
executed as schedule, and no anomalies were noted. 

   1.2 Completed STIS/CCD 7068 (STIS CCD Diffuse Source Acquisition (STIS =
11))

       The Space Telescope Imaging Spectrograph (CCD) was used to make =
image of the defuse object NGC-1399.  This is to demonstrate the ability =
of the STIS flight software to locate the brightest region in a diffuse =
or extended source within an acquisition aperture, determine the position =
of a spectroscopic slit, and position the target within the slit.  Just =
before this proposal was due to execute, SSR SA2 engineering data wrapped =
around.  This necessitated the use of ESTR #2 for engineering data =
recording.  Because of a rush in commanding due to an impending ZOE, a =
wrong argument was used in a PSTOL procedure which sets parameters for =
the TRI module.  As a result, a series of science accumulations, =
acquisitions, and mech moves which occurred between 106/0219Z and =
106/0258Z were irretrievably lost.  HSTAR 6029 was wriiten.  Otherwise, =
the observations in this three-and-a-half hour proposal were executed as =
scheduled, and no further anomalies were noted. 

   1.3 Completed Two Sets of WF/PC-2 6346 (Snapshot Survey of the =
Ultraluminous IRAS Galaxy Sample-Part 1 High)

       The WF/PC-2 was used to make snapshot survey observations of the =
ultraluminous IRAS galaxies QDOTULIR05 and IR14348-14.  These data will =
be searched for multiple cores, which imply a merger has occurred, and =
for starburst regions.  The observations were executed as scheduled, and =
no anomalies were noted.

   1.4 Completed STIS/CCD 7092 (CCD Dark Rate and Read Noise)

       Observations were taken to measure CCD dark current and gather =
data for making super darks.  The observations were completed as planned, =
and no anomalies were reported. 

   1.5 Completed FGS 6538 (The Distances to Dwarf Novae, and the =
Calibration of the Technique of Infrared Spectroscopic Parallax)

       The FGSs were used to make astrometric observations of the Dwarf =
Novae U-Gem and several other reference stars in order to measure its =
distance from its parallax.  The distances to this dwarf novae are poorly =
known.  This deficiency severely impacts our ability to quantify the =
energetics of the various processes taking place in dwarf novae systems.  =
The observations were executed as scheduled, and no anomalies were noted. =


   1.6 Completed WF/PC-2 6809 (An Optical Counterpart to the X-Ray Point =
Source in the Puppis A Supernova Remnant?)

       The WF/PC-2 was used to make observations of the STAR-08215 in =
order to search for an optical counterpart to the point x-ray source =
which is located in the Puppis A Super Nova Remnant.  All the data are =
consistent with the source being a hot neutron star formed at the time of =
the supernova which produced Puppis A, some 4000 years ago.  The =
observations were completed as scheduled, and no anomalies were reported. =


   1.7 Completed WF/PC-2 7590 (Cosmological Parameters Omega and Lambda =
>From High-Redshift Type IA Supernovae)

       The WF/PC-2 was used to make observations of type 1A supernova =
SN9784 in order to study its redshift, making direct measurements of the =
cosmological parameters Omega, Lambda, and curvature (Omega_k) using Type =
1A supernovae (SNe 1a) as a calibrated "standard candle".  The =
observations were executed as scheduled, and no anomalies were noted.

   1.8 Completed WF/PC-2 6685 (Globular Cluster Systems Along the Hubble =
Sequence)

       The WF/PC-2 was used to make images of the globular cluster =
NGC-45665 in order to study the globular cluster systems along the Hubble =
sequence.  This proposal is studying six globular cluster systems which =
are located in edge-on galaxies beyond the local group.  The observations =
were executed as scheduled, and no anomalies were noted. 

   1.9 Completed Two Sets of FGS 6566 (Calibrating the Mass-Luminosity =
Relation at the End of the Main Sequence)

       The FGSs were used to make astrometric observations of the componen=
ts of the low-mass, binary system stars GL748 and GL234 in order to make =
a calibrations of the mass-luminosity relation at the end of the main =
sequence.  The individual stars have masses of less than 0.2 solar =
masses.  The observations were completed as scheduled, and no problems =
were noted. 

   1.10 Completed WF/PC-2 6822 (Ionized Gas With Broad Emission Lines in =
the Nuclei of Ellipticals)

       The WF/PC-2 was used to make observations of the large elliptical =
galaxy NGC-2974 in order to study the broad emission lines in the =
nucleus.  Ionized gas disks in the central regions of elliptical galaxies =
have proven to be a powerful tool for the determination of the true =
spatial shape and the central mass-to-light ratio of their host galaxies. =
 The observations were completed as planned, and no problems were =
reported. 

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 12
                                        Successful : 12

                          Scheduled Reacquisitions : 4
                                        Successful : 4

   2.2 FHST Updates: 

                              Scheduled : 26
                             Successful : 26

   2.3 Operations Notes: 

       Operational error caused an approximate 39-minute loss of science =
data as described in 1.2.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science and SMOV operations.

/DMH