HUBBLE SPACE TELESCOPE DAILY REPORT #913 PERIOD COVERED: 0800 EST Daily Status Report as of 173/1200Z. 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed Three Sets of WFC 4277 (Calibration of Nearby Galaxies Type IA Supernaovae as Standard Candles) The Wide Field Camera was used to make three observations of the galaxy NGC-5253 to determine the periods of its known Cepheid variable stars. This will make it possible to accurately determine the distance to this galaxy. The observations were reported to be okay. 1.2 Completed WFC 4770 (WF/PC Cycle 2 Calibration: Internal Monitor Proposal) The Wide Field Camera was used to make one bias and one dark calibration images. These data are required for routine calibration of the instrument and for data reduction purposes. Both of the observations were reported to be normal calibration images. 1.3 Completed PC 4929 (WF/PC Cycle 2: Improved Dark Calibration) The Planetary Camera was used to make two dark calibration images. Both exposures lasted 1200 seconds, and the camera was pre-flashed. Both calibrations images were reported to be normal. 1.4 Completed FOC/96 3801 (Search for QSOs Suitable for Subsequent Observation of He II 304) The Faint Object Camera was used to attempt to make observations of quasar 1406+123 to measure the levels of its ultraviolet flux, to see if the flux levels are high enough for subsequent observations using the GHRS and FOS. The guide star acquisition prior to the observation failed to attain fine lock, and to observation was completed in course track. (See Note 2.1) 1.5 Completed FOC/96 4804 (UV Imaging of Nearby Galaxies with FOC/96) The Faint Object Camera was used to make one ultraviolet snapshot image of nearby galaxy ESO-0241-2. The exposure lasted for ten minutes and used filter F220W. The observation was received via the science tape recorder playback and displayed in the OSS. No problems were noted with the data. 1.6 Completed WFC 5010 (Determination of the Extragalactic Distance Scale. III. M-101. Recovery) The Wide Field Camera was used for a search of Cepheid variable stars in the Sc class spiral galaxy M-101 (aka, NGC-5457) located in Ursa Major. This will help determine the correct distance to this galaxy. This distance will be used to find the true luminosity of the type-Ia class supernova which has been observed in this galaxy. The observations were executed as scheduled, and no problems were reported. 1.7 Completed PC/WFC 4109 (WF/PC Cycle 2 Calibration: Rapid Internal Monitor) Rapid Internal Monitoring observations were made with both the Wide Field Camera and the Planetary Camera using filter F555W to look for new forms of contamination (i.e. daises and measles), and the possible return of quantum efficiency hysteresis. The observations were monitored in the OSS, and the data quality was assessed. No problems were reported. 1.8 Completed PC 4140 (WF/PC Cycle 2 Calibration: Rapid Internal Monitor) The WFPC was used to make internal flat calibrations images to check for new forms of contamination (i.e., Daises and measles), and to check for the possible return of quantum efficiency hysteresis. The observations completed as scheduled, and no problems were reported. 2.0 FLIGHT OPERATIONS SUMMARY: 2.1 Guide Star Acquisitions: Scheduled Acquisitions : 6 Successful : 5 Primary Acq. failed in Fine Lock at 172/1405Z, Successful in Course Track. Subsequent Acqs. A-Okay. (See Note 1.4) Scheduled Reacquisitions : 6 Successful : 6 Losses of Lock : 0 2.2 FHST Updates: Scheduled : 10 Successful : 10 2.3 Significant HSTARs: None 2.4 Operations Note: None 3.0 ACTIVITIES SCHEDULED FOR NEXT REPORTING PERIOD: 3.1 Complete WFC 4277 (Calibration fo Nearby Galaxy Type IA Supernovae as Standard Candles) 3.2 Complete Three Set of PC 4770 (WF/PC cycle 2: Internal Monitor Proposal) 3.3 Complete WFC 5010 (Determination of the Extragalactic distance Scale. III. M-101. Recovery) 3.4 Complete Two Sets of PC 4213 (Spectrophotometry of Lensed, "Clover Leaf" Broad Absorption Lines) 3.5 Complete PC 4393 (Disks Around Main Sequence Stars: Cycle 3 High) 3.6 Complete FOC/96 4804 (UV Imaging of Nearby Galaxies with FOC/96) 3.7 Uplink Updated Ephemeris Tables, Per MOSES 2871 3.8 Complete FOC/96 4353 (Hubble Space Telescope Imaging of IO: cycle 3 High) 4.0 ANOMALY STATUS: 4.1 Significant New Anomalies: None 4.2 Significant Unresolved Anomalies: None 5.0 SIGNIFICANT FORTHCOMING EVENTS: Nothing at this time. /DMH -END-