HUBBLE SPACE TELESCOPE DAILY REPORT #2025 PERIOD COVERED: 0000Z (UTC) 12/16/97 - 0000Z (UTC) 12/17/97 Daily Status Report as of 351/0000Z 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed Two 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 7802 (Daily Darks to Update Acquisition Bad Pixel Table) The Space Telescope Imaging Spectrograph (CCD) was used to make calibration observations to obtain daily darks to update the acquisition bad pixel table. These darks are intended to identify hot pixels for update to the acquisition on-board FSW hot pixel table. Daily hot pixel lists can also be used for science data analysis. The observations were executed as scheduled, and no anomalies were noted. 1.3 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. 1.4 Completed Five Sets of WF/PC-2 7786 (Pure Parallel Archive Survey - Continuation) The WF/PC-2 was used to make observations as part of an archival survey program in which the images were taken in parallel with the prime science observations. These WF/PC-2 parallel observations were obtained in the ultraviolet in a search for interesting objects. The observations were completed as planned, and no problems were reported. 1.5 Completed WF/PC-2 7203 (Cosmology with the Medium Deep Survey - Short Orbit Cases) The WF/PC-2 was used to take short (about 20 minute) exposures, to be taken in parallel with the prime science observations, using the I filter. These exposures are part of the medium-deep survey, which emphasizes exposures that will be useful in obtaining cosmological parameters. The observations were completed as planned, and no problems were reported. 1.6 Completed STIS/CCD 7639 (STIS CCD Imaging Sensitivity Monitor) The Space Telescope Imaging Spectrograph (CCD) was used to make observations of the globular cluster NGC-5139 (a.k.a., Omega Cen) in order to monitor the CCD's sensitivity. This proposal should give a check on the long-term, full-field photometric stability of the instrument. A bias observation and a dark calibration image were also taken. The observations were executed as scheduled, and no anomalies were noted. 1.7 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 CL1524+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. 1.8 Completed NIC/1/2 7904 (NICMOS Absolute Photometry: Red Standards) The Near Infrared Camera (Cameras One and Two) was used to make observations of standard source P330E-Cal in order to execute a red standard absolute photometry calibration. The throughput of NIC/1 and NIC/2 will also be measured using P330E and G191B2B. The observations were finished as planned, and no anomalies were reported. 1.9 Completed NIC/2 7331 (Near-IR Properties of the Bulges of Spiral Galaxies) The Near Infrared Camera (Camera Two) was used to make infrared observations of the bulge in spiral galaxy NGC-6951. Near-IR data at HST resolution are essential for correcting for the effect of dust and will enable us to derive robust nuclear properties for the sample. The observations were executed as scheduled, and no anomalies were noted. 1.10 Completed NIC/1/2/3 7368 (Infrared H_2 imaging of the highly symmetric proto-stellar jets HH212 and HH111) The Near Infrared Camera (Cameras One, Two and Three) was used to make infrared observations of the jets on the Herbig-Harow Object HH111 to determine the structure of faint reflection nebulae seen around the jet driving sources. This is to determine whether these are cavities excavated by the molecular outflows, or the upper surface of a large-scale disk around the source. The observations were complete as planned, and no anomalies were reported. 1.11 Completed WF/PC-2 7625 (WF/PC-2 Cycle 7 Earth Flats) The WF/PC-2 was used to make a series of Earth flat calibration images. These flat fields will allow mapping of the OTA illumination pattern and will be used in conjunction with previous internal and external flats to generate new pipeline superflats. The observations were completed as planned, and no anomalies were reported. 1.12 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 : 7 Successful : 7 Scheduled Reacquisitions : 8 Successful : 8 2.2 FHST Updates: Scheduled : 11 Successful : 11 2.3 Operations Notes: The STIS bad pixel table was uplinked at 350/2254Z. 3.0 SIGNIFICANT FORTHCOMING EVENTS: Continuation of normal science observations and calibrations. /DMH