HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1542

PERIOD COVERED:  0000Z (UTC) 12/22/95 - 0000Z (UTC) 12/27/95

Daily Status Report as of 361/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Three Sets of FOS/RD 6342 (The Spectrum of Background =
Light)

       The Faint Object Spectrograph (Red Side) was used to make =
spectrographic observations of back ground light.  These observations were =
taken in parallel during portions of the Hubble Deep Field (HDF) survey.  =
The data will be used to measure the extragalactic background light (EBL). =
 The observations were executed as scheduled, and no anomalies were noted.

   1.2 Completed Two Sets of WF/PC-2 6337 (The Hubble Deep Field =
Observations)

       The WF/PC-2 were used to take the Hubble Deep Field (HDF) images.  =
This project consists of hundreds of long WF/PC-2 exposures of the high =
galactic latitude field (HDF-123649), taken in eight visits.  A dark =
calibration image was also taken.  The observations were completed as =
planned, and no problems were reported.

   1.3 Completed Two Sets FOS/RD 6339 (Verification of the UV Spectrum of =
the HST Background Light )

       The Faint Object Spectrograph (Red Side) was used to make =
ultraviolet observations of the HST background light.  These FOS =
observations were taken parallel to the Hubble Deep Field (HDF) survey.  =
Both the HDF and these FOS data will be used to test and improve the =
existing engineering model of the HST background light.  The observations =
were completed as planned, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 6
                                        Successful : 6

                          Scheduled Reacquisitions : 33
                                        Successful : 33

   2.2 FHST Updates: 

                              Scheduled : 13
                             Successful : 13

   2.3 Operations Notes: 

       Temperatures aboard the HST are being closely monitored.  =
Excursions from normal ranges are being observed, principally in Bay #10, =
due to the HST attitude being at the same position for the duration of the =
multi-day Deep Field Survey and due to higher than nominal temperatures =
that regularly occur during this season.

       Data analysis reveals that the Voltage Sensing Circuits (VSCs) =
activated on days 349, 352, and 358 without explanation.  These circuits =
are designed to trigger when two or more VSCs sense that the diode bus =
voltage has exceeded 32.7 volts.  The VSCs then open relays that shunt an =
additional isolation diode to decrease the diode bus voltage by =
approximately 0.8 volts.  Analysis of these VSC activations in under =
investigation at this time.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

        Nothing at this time.

/DMH