HUBBLE SPACE TELESCOPE DAILY REPORT #1869 PERIOD COVERED: 0000Z (UTC) 05/01/97 - 0000Z (UTC) 05/02/97 Daily Status Report as of 122/0000Z 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed Three Sets of WF/PC-2 6909 (WF/PC-2 Cycle 6 Calibration: Earth Flats The WF/PC-2 was used to make observations of the bright Earth to obtain streak flats which are used to construct high quality flat fields for the WF/PC-2 filter set. The observations were executed as scheduled, and no anomalies were noted. 1.2 Completed STIS/CCD 7063 (STIS SMOV CCD Contamination Monitor) The Space Telescope Imaging Spectrograph (CCD) was used to make observations of standard star GD153 in order to measure flux and look for any gross changes over time that might indicate contamination. A waveline calibration observation was also completed. The observations were completed as scheduled, and no anomalies were reported. 1.3 Completed Four Sets of WF/PC-2 7553 (Pure Parallel Archive Survey II) WF/PC-2 parallel observations were obtained in the ultraviolet in search for interesting objects. This program is designed to find extragalactic sources with near ultraviolet excesses (3000 A0) outside the galactic plane and far ultraviolet sources (1600 A0) in the galactic plane. The procedure was executed as scheduled, and no anomalies were reported. 1.4 Completed Three Sets of NIC/1/2/3 7048 (NICMOS Parallel Thermal Background Test) The Near Infrared Cameras (Cameras One, Two and Three) were used to make observations of an object designated as Target-1 in order execute measurements of the stability of the HST thermal emissions. The observations were executed as scheduled, and no problems were reported. 1.5 Completed WF/PC-2 6496 (Nuclear Rings: Probing the Hearts of Barred Galaxies) The WF/PC-2 was used to make observations of the barred class galaxy ESO565-11 in order to study its inner nuclear region and "Nuclear Rings" structure. These small rings, less than 10'' in angular radius, are thought to trace the location of the inner Lindblad resonance (ILR), a 2:1 orbital resonance with the bar, that is of great importance to the structure and evolution of disk galaxies. The observations were completed as planned, and no anomalies were reported. 1.6 Completed 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 galaxy QDOTULIR10. 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. 1.7 Completed FGS 6878 (Parallax of NGC-6853) The Fine Guidance Sensors were used to make astrometric observations of stars located in NGC-6853. NGC 6853 is one of the closest planetary nebulae. Its trigonometric parallax is presently only poorly known. HST observations have the potential to reduce the parallax uncertainty to about 0.0005 arcsec. The observations were completed as scheduled, and no anomalies were reported. 1.8 Completed WF/PC-2 6905 (WF/PC-2 Cycle 6 Calibration: Internal Monitor) The WF/PC-2 was used to make several internal calibrations observations, including biases and internal flats, as part of a Cycle 6 calibrations procedure. A variety of internal exposures are run weekly to verify and monitor the health of the camera. The observations were executed as scheduled, and no anomalies were noted. 1.9 Completed Two Sets of FGS 7027 (Near Term Stability Monitor For FGS1R) The Fine Guidance Sensor (1-R) was used to make astrometric observations of the reference stars OF49, OF56, OF 42, (et al.) in order to monitor its near term stability. The goals are threefold: (1) to establish the baseline long term stability measurement for the new FGS and monitor changes in the relative plate scale and distortion since the SMOV Mini-OFAD; (2) to monitor changes in the transfer function on an orbital timescale and over weeks; (3) to monitor desorption changes in the position of the ITS. The observations were executed as scheduled, and no anomalies were noted. 1.10 Completed STIS/MA1/S/C 7105 (STIS MAMA Turn-on) The STIS/MA1 was successfully turned on. This will be the first high-voltage ramp-up of the far-ultraviolet and near-ultraviolet MAMA detectors. The operations was executed as scheduled, and no anomalies were noted. 1.11 Completed Three Sets of WF/PC-2 6802 (Cosmology With the Medium Deep Survey) The WF/PC-2 was used to make observations taken in parallel with the prime science observations as part of the Medium Deep Sky Survey. The observations were executed as scheduled, and no problems were reported. 1.12 Completed Two Sets of WF/PC-2 6904 (WF/PC-2 Cycle 6 Calibration: Darks) The WF/PC-2 was used to make a series of several dark calibration images as part of a standard calibration within Cycle 6. This calibration procedure is performed once per week as part of an on going CCD calibration to be used to monitor and characterize hot pixels. The observations were executed as scheduled, and no anomalies were noted. 1.13 Completed WF/PC-2 6906 (WF/PC-2 Cycle 6 Calibration: Internal Monitor-Visual Flats) The WF/PC-2 was used to make internal calibration, visual flat images as part of the Cycle 6 internal monitoring of the instrument's operations. This proposal defines the standard series of internal flat fields, which will be executed twice per month. The observations were completed as planned, and no anomalies were reported. 2.0 FLIGHT OPERATIONS SUMMARY: 2.1 Guide Star Acquisitions: Scheduled Acquisitions : 7 Successful : 7 Scheduled Reacquisitions : 9 Successful : 9 2.2 FHST Updates: Scheduled : 12 Successful : 12 2.3 Operations Notes: There were no reported operational problems. 3.0 SIGNIFICANT FORTHCOMING EVENTS: Continuation of normal science and SMOV operations. /DMH