HUBBLE SPACE TELESCOPE DAILY REPORT #2052 PERIOD COVERED: 0000Z (UTC) 02/02/98 - 0000Z (UTC) 02/03/98 Daily Status Report as of 034/0000Z 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed Three Sets of WF/PC-2 7621 (WF/PC-2 Cycle 7 Supplemental Darks PT1/3) The WF/PC-2 was used to make supplemental dark calibration images. This set of calibrations is intended to obtain three dark frames every day to provide data for monitoring and characterizing the evolution of hot pixels. The observations were executed as scheduled, and no anomalies were noted. 1.2 Completed STIS/CCD 7711 (STIS CCD G750L Fringing Flats.) The Space Telescope Imaging Spectrograph (CCD) was used to investigate and monitor the STIS CCD flat-field fringing in the G750L grating at its nominal wavelength setting {7751A}. WAVECALs were also taken at the same gain and wavelength setting. Typical S/N = 100 for each integration, and gain = 4 on each. The observations were executed as scheduled, and no anomalies were noted. 1.3 Completed WF/PC-2 7592 (Follow-Up Observations of a Possible Optical Counterpart of GRB 970228) The WF/PC-2 was used to make observations to look for an optical counterpart to Gamma Ray Burster GRB970228. The immediate goals of the observations are: (i) to constrain the magnitude of the variable object to the deepest possible flux levels that can be reached in a reasonable exposure time, and (ii) to obtain the best morphological information on the 'companion'. The observations were completed as planned, and no anomalies were reported. 1.4 Completed Two Sets of STIS/MA2 7604 (Cycle 7 MAMA Dark Measurements) The Space Telescope Imaging Spectrograph (MA2) was used to make MAMA dark measurements. These darks will be used in later image reductions and also trended over the instrument's life time as an indicator of the detector's degradation or damage. The observations were completed as scheduled, and no problems were reported. 1.5 Completed Three Sets of WF/PC-2 7336 (Cosmological Parameters Omega and Lambda From High-Redshift Type Ia Supernovae) The WF/PC-2 was used to make observations of the high redshifted Type Ia supernovae SN4-8H-Z0 and SN5-8H-Z0 and SN2-5H-Z0. HST can make a direct measurement of the cosmological parameters, Omega, Lambda, and curvature, using Type Ia supernovae as calibrated "standard candles." The observations were executed as scheduled, and no anomalies were noted. 1.6 Completed NIC/1/2/3 7596 (NICMOS MULTIACCUM Dark Characterization) The Near-Infrared Camera Multi-Object Spectrograph (Cameras One, Two and Three) were used to make a NICMOS MULTIACCUM dark characterization. The purpose of this proposal is to monitor the darks using three different MULTIACCUM sequences. The observations were executed as scheduled, and no anomalies were noted. 1.7 Completed STIS/CCD 7602 (CCD Flat Field Program) The Space Telescope Imaging Spectrograph (CCD) was used to execute some on-orbit flat field calibration observations which were not obtained during some ground calibration. The observations were completed as planned, and no problems were reported. 1.8 Completed Eight Sets of NIC/2/3 7907 (NICMOS pure parallel Winter 97-98) The Near Infrared Camera (Cameras Two and Three) was used to make pure parallel spectrographic observations of sky regions when another instrument is prime. The observations were completed as planned, and no anomalies were reported. 1.9 Completed Eight Sets of STIS/CCD 7910 (STIS Extragalactic Parallel Survey) The Space Telescope Imaging Spectrograph (CCD) was used to make extragalactic slitless spectrographic observations as part of the parallel high galactic latitude survey to search for emission line galaxies. Data was taken in parallel, and not subject to proprietary time. The observations were executed as scheduled, and no anomalies were noted. 1.10 Completed WF/PC-2 7619 (WF/PC-2 Cycle 7 Decontamination) The WF/PC-2 was used to conduct a Cycle 7 decontamination procedure. Ultraviolet-blocking contaminants were removed, and hot pixels cured, by warming the CCDs to +20C for 6 hours. A variety of internal images were taken before and after the decontamination in order to verify its success and to monitor the instrument's health. The procedures were conducted as scheduled, and no problems were reported. 1.11 Completed NIC/2 7327 (Elliptical Galaxy Evolution at High Redshift: IR Imaging of 60 Distant Clusters) The Near Infrared Camera (Camera Two) was used to make infrared observations high redshifted elliptical galaxies in galactic cluster CL0932+463. By measuring the structural properties of high redshift cluster elliptical galaxies, it is hoped to resolve the controversy regarding the age and formation history of bright cluster ellipticals. The observations were executed as scheduled, and no anomalies were noted. 1.12 Completed Three Sets of NIC/1/2/3 7850 (Cosmological Parameters Omega and Lambda from High-Z Type Ia Supernovae) The Near Infrared Camera (Cameras One, Two and Three) was used to make observations of high Z type Ia Super Nova SN97226 in order to measure the Omega and Lambda parameters. Type Ia supernovae {SNe Ia} can be used as calibrated standard candles to measure large distances. The observations were completed as planned, and no anomalies were reported. 1.13 Completed WF/PC-2 7505 (The Hubble Diagram for Distant Supernovae Measuring Cosmic Deceleration and Global Curvature) The WF/PC-2 was used to make observations of Super Nova SN1998B1 in order to produce a precise Hubble diagram from measuring cosmic deceleration and global curvature. HST can make an essential contribution by providing photometry with substantially higher precision and better temporal coverage than can be obtained from the ground. The observations were completed as planned, and no anomalies were reported. 1.14 Completed WF/PC-2 7620 (WF/PC-2 Cycle 7 Standard Darks) The WF/PC-2 was used to make a series of Cycle 7 standard dark calibration images. This dark calibration program obtains dark frames every week in order to provide data for the ongoing calibration of the CCD dark current rate, and to monitor and characterize the evolution of hot pixels. The observations were executed as scheduled, and no anomalies were noted. 1.15 Completed NIC/2 7420 (A Near-Infrared Search for Very Low Mass Companions to Stars Within 10 Parsecs of the Sun) The Near Infrared Camera (Camera Two) was used to make searching observations for very low mass companions to variable star HD2151. This star is known to be within 10 parsecs of the Sun. The observations were executed as scheduled, and no anomalies were noted. 1.16 Completed WF/PC-2 5901 (Imaging of Gravitational Microlens Source Systems and Their Underlying Stellar Backgrounds) The WF/PC-2 was used to make observations of the gravitation microlens source system LMC-0515-6 which is located in the Large Magellanic Cloud. This is to study the underlying stellar background. The deep images of the sources will provide first epoch images for comparison with later images to resolve the proper motion of the lensing object, if it is luminous. The observations were executed as scheduled, and no anomalies were noted. 2.0 FLIGHT OPERATIONS SUMMARY: 2.1 Guide Star Acquisitions: Scheduled Acquisitions : 11 Successful : 11 Scheduled Reacquisitions : 2 Successful : 2 2.2 FHST Updates: Scheduled : 18 Successful : 18 2.3 Operations Notes: At 033/1511Z, the STIS flight software 4.8 pre-installation memory dump was performed and, at 033/1937Z, the SSR fast telemetry monitors for the installation were selected. Then, while carefully monitoring the process, operations and SE personnel successfully installed the software at 034/0224Z. Finally, a post-installation memory dump and a checksum compare were performed. 3.0 SIGNIFICANT FORTHCOMING EVENTS: NICMOS flight software 4.10 installation and continuation of normal science observations and calibrations. /DMH