HUBBLE SPACE TELESCOPE DAILY REPORT #2037 PERIOD COVERED: 0000Z (UTC) 01/09/98 - 0000Z (UTC) 01/12/98 Daily Status Report as of 012/0000Z 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed Three Sets of 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. 1.2 Completed Nine 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. 1.3 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 NIC/2 7228 (Imaging and Polarimetry of YSO'S) The Near Infrared Camera (Camera Two) was used to investigate the young stellar object HH7-11-2 with coronagraphic imaging, polarimetry, and line imaging. The observations were completed as planned, and no problems were reported. 1.5 Completed Eight 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. As detailed in 2.1, the guide star acquisition for the final iteration of this proposal initially failed, and the take data flag remained down for approximately 18 minutes. Otherwise, the observations were completed as planned, and no further problems were reported. 1.6 Completed Two Sets of 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 stars HD16160 and HD225213. These stars are known to be within 10 parsecs of the Sun. The observations were executed as scheduled, and no anomalies were noted. 1.7 Completed WF/PC-2 7385 (Low-Mass Halo Binaries) The WF/PC-2 was used to make observations of the low mass, halo, binary, {Population II}, M-type, sub-dwarf, stars LHS216 and HD28497. These stars are too faint to be resolved through ground-based speckle interferometry, thus HST represents the only means of probing separations. The observations were completed as planned, and no anomalies were reported. 1.8 Completed Two Sets of STIS/CCD/MA1/MA2 7673 (STIS MAMA Sensitivity and Focus Monitor) The Space Telescope Imaging Spectrograph (CCD/MA1/MA2) was used to make observations of standard stars AGK+81D266 and GRW+70D582in order to perform a MAMA sensitivity and focus monitoring program. This is to monitor sensitivity of each MAMA grating mode to detect any change due to contamination or other causes. A dark and wavelength calibration images were also taken. The observations were executed as scheduled, and no anomalies were noted. 1.9 Completed FGS 6881 (Determination of the Masses of the Hyades Binary VA351 and the Circumstellar Structure of the Supergiant VV Cep {HD 208816}) The Fine Guidance Sensors were to be used to make astrometric observations of the variable supergiant star VV Cep (a.k.a., HD208816). A search with Hubble Space Telescope Fine Guidance Sensor 3 in TRANS mode of 36 probable Hyades cluster members in the magnitude range V=10--15 has yielded nine certain binary detections. As detailed in 2.1, the guide star acquisition for this proposal failed, and the take data flag remained down. 1.10 Completed Five Sets of STIS/CCD 7783 (STIS Parallel Science) The Space Telescope Imaging Spectrograph (CCD) was used to make observations taken in parallel with the prime science. As detailed in 2.1, the guide star acquisition for the first iteration of this proposal failed, and the take data flag remained down. Otherwise, the remaining observations were executed as planned with no further problems. 1.11 Completed Three Sets of WF/PC-2 7428 (The Nucleus of Comet 55P/Tempel-Tuttle, the Parent of the Leonid Meteors) The WF/PC-2 was used to make observations of the nuclear region of the comet 55P/Temple-Tuttle. This comet is the parent of the Leonid Meteor shower. The HST images will also enable us to study the circum-nuclear region, in particular, the relationship of the nuclear outgassing and the physical properties of the dust {e.g., its color} to the nuclear rotation. We expect to image possible dust structures and to possibly map the sources of dust on the nucleus. The observations were completed as planned, and no anomalies were noted. 1.12 Completed WF/PC-2 6716 (The Pattern of Massive Star Formation in Irregular and Amorphous Galaxies) The WF/PC-2 was used to make observations of the galaxy NGC-4449. The objective is to obtain deep WF/PC-2 images in far-ultraviolet (~1700 A0),U , V, and I bandpasses of the stellar populations in four nearby galaxies known from their observed far-ultraviolet luminosities to be forming massive (OB) class stars. The observations were completed as planned, and no anomalies were reported. 1.13 Completed Nine Sets of STIS/CCD 7781 (STIS Non-Scripted Parallel Archive Proposal - Full Orbit) The Space Telescope Imaging Spectrograph (CCD) was used for a non-scripted parallel archive proposal (one full orbit). The observations were executed as scheduled, and no anomalies were noted. 1.14 Completed Ten Sets of NIC/2/3 7922 (New NICMOS Modified One Orbit Parallel) The Near Infrared Camera (Cameras One and Two) was used to make one orbit parallel observations. This proposal obtains "JH" imaging, and G096 and G141 spectroscopy of sky regions when another instrument is prime. STEP64 sequences are used and two dither positions are obtained for each filter. The observations were executed as scheduled, and no anomalies were noted. 1.15 Completed STIS/CCD 7674 (IR Standards) The Space Telescope Imaging Spectrograph (CCD) was used to make observations of standard star BD+28D4211 to establish a set of absolute flux standards on the WD scale that extend the existing wavelength coverage to 10300A with the STIS G750L grating setting. The proposal completed with no reported problems. 1.16 Completed Two Sets of NIC/1/2/3 7268 (Nuclear Brightness Profiles of Merger Remnants; Do Mergers Form Ellipticals?) The Near Infrared Camera (Cameras One, Two and Three) was used to make observations of the elliptical galaxies NGC-3921 and NGC-3656. Many elliptical galaxies might have formed from mergers of disk galaxies. Numerical simulations yield elliptical-like remnants and observed merger remnants have R^1/4 surface brightness profiles. However, while the global properties of merger remnants and ellipticals are similar, it is unknown whether this is true for their nuclear properties as well. The observations were executed as scheduled, and no anomalies were noted. 1.17 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. 1.18 Completed WF/PC-2 7384 (Probing the Fine-Scale Structure and Colors of Interstellar "Cirrus" Clouds) The WF/PC-2 was used to make observations of NEB-013921 in order to probe the fine-scale structure and colors of interstellar "cirrus" clouds. The ubiquitous nature of Galactic "cirrus" clouds make them both: {1} accessible targets for the study of the properties of interstellar dust grains, and {2} sources of confusion in investigations of distant objects {e.g. galaxies, clusters of galaxies} at low surface brightness levels. The observations were completed as planned, and no problems were reported. 1.19 WF/PC-2 6549 (Calibration of Nearby Type Ia Supernovae as Standard Candles: NGC 3627 and SN 1989B) The WF/PC-2 was used to make observations of the Type Ia supernova SN 1989B which is located in galaxy NGC-3627. The experiment is designed to determine the mean absolute magnitude of the B and V of SNe Ia, and how large the dispersion is about this mean. The observations were completed as planned, and no problems were reported. 1.20 Completed WF/PC-2 7390 (High Resolution UV Spectroscopy of the Extra-Ordinary Central Star of Abell 35) The WF/PC-2 was used to make high resolution ultraviolet observations of the central extra-ordinary star BD-22D3467 which is located in the center of planetary nebula Abell 35. This star is a rapidly rotating G8III-IV star which dominates the optical light, and a white dwarf, probably belonging to the PG1159 class, that dominates the UV flux. The observations were completed as scheduled, and no problems were reported. 1.21 Completed WF/PC-2 6578 (Optical Morphology of NGC 5128: X-Ray Ridges and the Geometry of the Dust Lane) The WF/PC-2 was used to make observations of the galaxy NGC-5128 in order to study its optical morphology and the geometry of its dominate dust lane and strong x-ray ridges. This should resolve the stellar associations and determine the number, luminosities and spectral types of the sources seen along the edge of the dust lane which were seen in earlier observations with WF/PC-I. The observations were completed as planned, and no anomalies were noted. 1.22 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 of the high redshifted elliptical galaxies in galactic cluster CL0050-361. 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. 1.23 Completed Four 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 SN5-8H-Z0, SN4-8H-Z0, SN1-5H-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. 1.24 Completed Six Sets of STIS/CCD 7782 (STIS Non-Scripted Parallel Archive Proposal - Half Orbit) The Space Telescope Imaging Spectrograph (CCD) was used for a non-scripted parallel archive proposal (one-half orbit). The observations were executed as scheduled, and no anomalies were noted. 1.25 Completed WF/PC-2 7618 (WF/PC-2 Cycle 7 Photometric Monitor UV/OPT STD) The WF/PC-2 was used to make observations of the standard star GRW+70D582 as part of a Cycle 7 photometric monitoring program. This ultraviolet spectrophotometric standard star was observed in a variety of filters and cameras to monitor the photometric stability and quantum efficiency of WF/PC-2 from the far-ultraviolet to near-infrared. The observations were completed as scheduled, and no problems were reported. 1.26 Completed WF/PC-2 6598 (The Reddest Objects in The Universe) The WF/PC-02 was used to make observations of the object ERO1215-00 which is known to be one of the reddest objects in the universe. This is one of the members of a recent deep K-Band imaging surveys which discovered a new population of infrared bright, extremely red (R-K~gt 6 class), objects (EROS). The observations were completed as scheduled, and no anomalies were reported. 1.27 Completed NIC/1/2/3 7328 (High Resolution IR Imaging Survey (IRIS) of the Centers of the Nearest Active Galaxies) The Near Infrared Camera (Camera One, Two and Three) was used to make high resolution infrared observations of the nearest active Markarian galaxy (Markarian 1) in order to study its inner nuclear region. Observing in the near-IR minimizes the dust obstruction and maximizes sensitivity to the old stellar population which dominates the mass. The observations were executed as scheduled, and no anomalies were noted. 2.0 FLIGHT OPERATIONS SUMMARY: 2.1 Guide Star Acquisitions: Scheduled Acquisitions : 30 Successful : 29 Per HSTAR 6305, the acquisition scheduled at 009/112834Z failed when FGS-1 exceeded the scan step limit and FGS-2 remained under RGA only control. Observations described in 1.9 and 1.10 were affected. As described in HSTAR 6308, the single guide star acquisition scheduled at 011/033835Z initially failed when FGS-1 failed to RGA control -- the FGS had a hard time holding the star in coarse track. The FGS finally achieved fine lock at 011/035433Z. This loss of lock is detailed in HSTAR 6308. Scheduled Reacquisitions : 12 Successful : 12 2.2 FHST Updates: Scheduled : 57 Successful : 55 The update at 009/141438Z filed due to FGS-3. There was no impact to science. HSTAR 6306 was written. The update at 009/203726Z failed due to FGS-1 with no impact to science. HSTAR 6307 was filed. 2.3 Operations Notes: Operations personnel adjusted the battery 3 temperature limit at 009/1126Z when the existing limit was violated. A STIS memory dump was performed at 010/0958Z. ESTRs 2 and 3 were re-conditioned at 011/0500Z per ROP RD-7. The secondary mirror was successfully adjusted by 21 microns with actuator commanding at 012/0117Z. However, as described in HSTAR 6309, during each of the three forward direction motion commands, it was noticed that the sensed direction toggled between forward and reverse directions, a performance indication noted in prior moves. This is not thought to be indicative of any problem, although HDOS personnel will investigate this occurrence. Both acquisitions following the mirror move were successful. 3.0 SIGNIFICANT FORTHCOMING EVENTS: Continuation of normal science observations and calibrations. /DMH