HUBBLE SPACE TELESCOPE DAILY REPORT #1123 PERIOD COVERED: 0700 EST Daily Status Report as of 112/1200Z. 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed WF/PC-2 5475 (A Snapshot Survey for Blue Stragglers in Magellanic Cluster Cores)) The WF/PC-2 was used to make short exposure snapshot images of the blue straggler stars located in populous cluster NGC-2004. A populous cluster is the Magellanic Cloud equivalent of a galactic globular cluster. The observations were made with two different color filters. The intent is to find out if blue straggler stars exist within these clusters. Two observations were executed as scheduled. One was received and displayed, the other still remains on the science tape recorder. No anomalies were noted. 1.2 Completed Three Sets of WF/PC-2 5561 (WF/PC-2 Cycle 4 Calibration: Internal Monitor 2. Flats) The WF/PC-2 was used to make a set ultraviolet flat calibration images to monitor flat field stability and the stability of the analog-to-digital converters. Eight observations were received and displayed. Three were okay, four were saturated, and one was underexposed. 1.3 Completed WF/PC-2 5632 (WF/PC-2 Cycle 4: Preflash Test) The WF/PC-2 Was used to study variations in sensitivity along the columns of each CCD by making images of test globular cluster Omega Centauri (aka, NGC-5139). Three images were received and displayed. They were reported to look okay. 1.4 Completed WF/PC-2 5563 (WF/PC-2 cycle 4 Photometric Calibration Monitor: UV/Opt STD) The WF/PC-2 was used to make photometric calibration images of ultraviolet standard star GRW+70D582 and monitor the photometric stability and quantum efficiency of the WF/PC-2. The observations were executed as scheduled, and no anomalies were noted. 1.5 Completed GHRS/2 5597 (GHRS ECH-B Sensitivity Calibration: Cycle 4) The High Resolution Spectrograph was used to attempt to make an ultraviolet flat calibration observations using standard star MU-Columbia to calibrate the sensitivity of Echelle-B. Both the Large Science Aperture (LSA) and Small Science Aperture (SSA) were to be used. Because of a guide star acquisition failure, none of the observations for this proposal were executed. The observations were marked as failed. 1.6 Completed FGS 5174 (Astrometric Companion Search: Cycle 4) FGS #3 was used to make astrometric observations of the possible binary dwarf star BD+67D552 to look for an astrometric unseen low mass companion. The OSS monitored the observations and assessed the data quality. The observational data remains on the science tape recorder. No anomalies were noted. 1.7 Completed WF/PC-2 5091 (GTO High Latitude Parallel Program: Cycle 4) The WF/PC-2 was used in parallel with the prime science observations to make high galactic latitude observations greater than +/-30 degrees. These are randomly chosen fields to sample very low luminosity stars in the solar galactic neighborhood, galactic halo objects, and distant galaxies. The observational data remains on the science tape recorder, and will be analyzed alter. No anomalies were noted. 1.8 Completed WF/PC-2 5476 (Continuum Snapshot of 3CR Radio Galaxies) The WF/PC-2 was used to make snapshot images of radio galaxy 3C194.0 as part of a continuum survey and to study the galaxy's morphology. The observations were executed as scheduled, and no anomalies were noted. The science observations remain on the science tape recorder, and will be analyzed later. 1.9 Completed GHRS/2 5398 (Eclipse Mapping of the Chromospheric and Transition Region Structure) The High Resolution Spectrograph was used to obtain high signal to noise ratio spectra of the eclipsing binary star HR2554 (aka, HD50337) which is a known Zeta Aurigae-Type binary star. This system consists of a dwarf star and a G6 giant star. The light from the dwarf will be used as a probe of the outer atmosphere of the giant star. The observations were executed as scheduled, and no anomalies were noted. The science observations remain on the science tape recorder, and will be analyzed later. 2.0 FLIGHT OPERATIONS SUMMERY: 2.1 Guide Star Acquisitions: Scheduled Acquisitions : 7 Successful : 6 One Failed (See Item 1.5). The subsequent baseline guide star acquisition was successful. Scheduled Reacquisitions : 8 Successful : 6 Two Failed (See Item 1.5) 2.2 FHST Updates: Scheduled :15 Successful :13 Two failed (See Item 1.5) 2.3 Significant HSTARs: None 2.4 Operations Notes: All HST onboard subsystems are performing nominally. However, a guide star acquisition failed due to a FHST update failure. Despite two attempts to uplink attitude updates to the spacecraft, two subsequent reacquisitions failed. The pointing difficulties continued until the HST slewed to a new attitude. (See Items 1.5, and 2.1) 3.0 ACTIVITIES SCHEDULED FOR NEXT REPORTING PERIOD: 3.1 Complete WF/PC-2 5560 (WF/PC-2 Cycle 4 Calibration: Internal Monitor. 1) 3.2 Complete Three Sets of GHRS/1 5593 (GHRS ECH-A Blaze Function Calibration: Cycle 4) 3.3 Complete Two Sets of WF/PC-2 5476 (Continuum Snapshot of 3CR Radio Galaxies) 3.4 Complete Two Sets of WF/PC-2 5397 (Determination of the Extragalactic Distance Scale: Cycle 4 High) 3.5 Complete Two Sets of WF/PC-2 5570 (WF/PC-2 Cycle 4 Calibration: Earthflats, Large Set) 3.6 Complete WF/PC-2 5415 (The Distance to the M-96 Galaxy Group: Cycle 5 Medium) 3.7 Complete WF/PC-2 5612 (SMOV WF/PC-2 Decontamination) 3.8 Complete FOC/96 5517 (FOC Absolute Sensitivity: Cycle 4 ) 3.9 Complete GHRS/1 5542 (GHRS Side One Wavelength (1st Order Gratings): Cycle 4) 3.10 Complete GHRS/2 5473 (The Interstellar Abundance of Krypton: Cycle 4 High) 3.11 Complete Two Sets S/C/WF/PC-2 5612 (SMOV WF/PC-2 Decontamination) 3.12 Complete FOC/96 5377 (UV Observations of Pulsars: Cycle 4 Medium) 3.13 Complete FGS 5338 (Linking the HIPPARCOS to the Extragalactic Reference Frame, NEWHIP-D) 3.14 Complete Two Sets of WF/PC-2 5370 (HST Medium-Deep Survey: Cycle 4 Medium, High Galactic Latitude) 3.15 Complete FGS 5337 (Linking the HIPPARCOS to the Extragalactic Reference Frame, NEWHIP-C) 4.0 ANOMALY STATUS: 4.1 Significant New Anomalies: None 4.2 Significant Unresolved Anomalies: None 5.0 SIGNIFICANT FORTHCOMING EVENTS: Today, a RMGA calibration is scheduled. It will be followed by DF-224 flight software patches involving modifications of the RWA friction limits and the sun angle/SA normal test.