HUBBLE SPACE TELESCOPE DAILY REPORT #2065 PERIOD COVERED: 0000Z (UTC) 02/20/98 - 0000Z (UTC) 02/23/98 Daily Status Report as of 054/0000Z 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed Three Sets of STIS/CCD 7926 (CCD Dark and Bias Monitor -- Continued) The Space Telescope Imaging Spectrograph (CCD) was used to make several dark and bias calibration observations. This is to measure CCD dark current and bias rates for the two supported amplifier settings {gain = 1 and gain = 4} in order to gather data for making superdarks and superbiases. These observations will also track the growth of hot pixels on the CCD in general and within the various target acquisition apertures specifically. The observations were executed as scheduled, and no anomalies were noted. 1.2 Completed Seven 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 Three Sets of 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 the nebulae NEB-011543 and NEB-011548 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. 1.4 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. 1.5 Completed Three Sets of STIS/CCD 7803 (Daily Darks to Update Acquisition Bad Pixel Table Part III) The Space Telescope Imaging Spectrograph (CCD) was used to make daily dark calibration updates. These daily 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 completed as planned, and no anomalies were reported. 1.6 Completed STIS/CCD/WF/PC-2 7367 (Multi-Mavelength Imaging of Circumstellar Disks in the Orion Nebula) The Space Telescope Imaging Spectrograph (CCD) and the WF/PC-2 was used to make multi-wavelength imaging of circumstellar disks (NGC-1976) seen as silhouettes against the bright emission-line background in the Orion Nebula. With these data one should be able to examine the radial structure of the disks in great detail, and over a wide spatial extent. The observations were completed as planned, and no problems were reported. 1.7 Completed Eight Sets of STIS/CCD 7908 (POMS Test Proposal: STIS Non-Scripted Parallel Proposal) The Space Telescope Imaging Spectrograph (CCD) was used to make calibration observations as part of the POMS Test Proposal. This was a STIS non-scripted parallel proposal. The observations were completed as planned, and no problems were reported. 1.8 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. 1.9 Completed Two Sets of 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 clusters MS0451.6-0 and CL1137-120. 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. 1.10 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 HD30652. This star is known to be within 10 parsecs of the Sun. The observations were executed as scheduled, and no anomalies were noted. 1.11 Completed STIS/CCD 7435 (Nuclear Kinematics and Stellar Population Gradients in the Recent Merger Remnants NGC-7252 & NGC-3921) The Space Telescope Imaging Spectrograph (CCD) was used to make observations of NGC-3921 in order to study its nuclear kinematics and stellar population gradients. Ground-based spectra show this galaxy contains centrally concentrated young stellar populations and emission-line gas, indicative of a merger-induced episode of star formation. A wave length calibration observation was also taken. The observations were completed as planned, and no problems were reported. 1.12 Completed Two Sets of NIC/3 7499 (NICMOS Extragalactic Parallel Grism Survey) The Near Infrared Camera (Camera Three) was used to make observations as part of an extragalactic parallel Grism Survey. This propose is a parallel program using NICMOS's unique capabilities for slitless spectroscopy in the near IR. The observations were completed as planned, and no anomalies were reported. 1.13 Completed Three Sets of NIC/1/2/3 7215 (Line and Continuum Investigation of NGC 1068 and NGC 4151) The Near Infrared Camera (Cameras One, Two, and Three) was used to make observations of the bright, nearby AGNs NGC-1068. This program studies the high resolution morphology of the continuum and line emission in these two galaxies. The continuum studies will determine the stellar and non-stellar luminosity distribution in the galaxies. The observations were executed as scheduled, and no anomalies were noted. 1.14 Completed NIC/3 7830 (IR Spectra for Known-Mass M Dwarfs) The Near Infrared Camera (Camera Three) was used to make infrared spectrographic observations of M-Class dwarf star GJ473AB. Over the last decade there has been considerable debate on two major issues in the low-mass star literature: {1} the effective temperature scale for M dwarfs and its relation to mass and luminosity and {2} the conversion from an absolute magnitude in some passband to a bolometric magnitude. The observations were executed as scheduled, and no anomalies were noted. 1.15 Completed Six Sets of WF/PC-2 7909 (POMS Test Proposal: WF II Parallel Archive Proposal) The WF/PC-2 was used to make parallel observations as part of the POMS test proposal. This test proposal is designed to simulate scientific plans. As detailed in 2.1, the acquisition for the final iteration of this proposal defaulted to fine lock on one FGS only. Otherwise, the observations were completed as planned, and no further problems were reported. 1.16 Completed STIS/MA1 7434 (The Supernova Intensive Study) The Space Telescope Imaging Spectrograph (MA1) was used to continue the long-term project on supernovae by observing SN1993J. HST can make unique contributions to understanding supernovae, as has been demonstrated through this program in past years, and now STIS and NICMOS offer new opportunities for deepening this investigation. The aim of the proposal is to explore the UV emission from supernovae, exploit the spatial resolution of HST and press the late-time observations of supernovae into uncharted territory. The observations were completed as planned, and no anomalies were reported. 1.17 Completed Two 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. As detailed in 2.1, the acquisition for the second iteration of this proposal defaulted to fine lock on one FGS only. Otherwise, the observations were completed as planned, and no further anomalies were reported. 1.18 Completed WF/PC-2 7387 (T-Tauri Star Snapshot Survey) The WF/PC-2 was used to make observations of the star HD-17717 as part of a T-Tauri class star survey. The observations were executed as scheduled, and no anomalies were noted. 1.19 Completed STIS/CCD 7674 (IR Standards) The Space Telescope Imaging Spectrograph (CCD) was used make observations of stadard stars HZ43 and HD93521 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. 1.20 Completed FOC/96 6426 (A Search for Multiple Images of QSOs Seen Through Damped Ly-Alpha Absorbers) The Faint Object Camera (f/96) was used to make observations of QSO B0218+35.7. The propose of these observations is to obtain high-resolution images of a sample of QSOs with strong damped Lyman-Alpha absorption in their spectra. The observations should determine whether these QSOs are multiply imaged by gravitational lensing. The observations were completed as planned with no problems. 1.21 Completed Two Sets of WF/PC-2 6651 (WLR Distances from Accurate Multi-Color WF/PC-2 Photometry of A & B Supergiants in M-31 and M-33) The WF/PC-2 was used to make multi-color photometric observations of NGC-598 (a.k.a., M-33). This is to study A and B supergiant stars in M-31 and M-33 with a precision far exceeding that of existing ground-based estimates. The observations were completed as planned with no problems. 1.22 Completed WF/PC-2 6633 (Cusps or Cores in Barred Bulges?) The WF/PC-2 was used to make observations of the SB class (Barred) galaxy NGC-3516 in order to study its nuclear bulge region and cusps. This is a highly tri-axial, tumbling, low-mass stellar systems. The observations were completed as planned, and no problems were reported. 1.23 Completed NIC/1/2/3 7880 (A Search For Old Stars in IZw18, Continued) The Near Infrared Camera (Cameras One, Two and Three) was used to make observations of galaxy IZW18 to search for old stars. The blue compact dwarf galaxy IZw18 still stands out as one of the most interesting objects at low redshift. Its heavy element abundance is the lowest ever measured in the ionized gaseous component of a galaxy. The observations were completed as scheduled, and no anomalies were reported. 1.24 Completed STIS/CCD/MA1 7295 (Galaxy Rotation Curves at Large Radius using Lyman-alpha Absorption Lines) The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make rotational spectrographic observations of the galaxy PG0804+761. This is to investigate the outer rotation curves of eight spiral galaxies at very large galactocentric radii by using the kinematical information from Lyman-alpha absorption lines in the spectra of background quasars. As detailed in 2.1, the acquisition for this proposal defaulted to fine lock on one FGS only. Otherwise, the observations were executed as scheduled, and no further problems were reported. 1.25 Completed NIC/1/2 7607 (NICMOS Photometric Monitoring Test) The Near Infrared Camera (Cameras One and Two) was used to conduct a photometric monitoring test by making observations of standard star P330E-CAL. The standard star was observed with NIC1 & NIC2 at six different wavelengths spanning the NICMOS wavelength range. The observations were completed as planned, and no anomalies were reported. 1.26 Completed WF/PC-2 6659 (A Search For Superplanets Around Weak T- Tauri Stars) The WF/PC-2 was used to make observations in the 1 micron band of the T-Tauri class star STAR1601-2 in order to search for superplanets. Weak T-Tauri class stars are thought to have dissipated their circumstellar disks recently, possibly by forming planetary systems. The observations were completed as planned, and no anomalies were reported. 2.0 FLIGHT OPERATIONS SUMMARY: 2.1 Guide Star Acquisitions: Scheduled Acquisitions : 29 Successful : 29 The acquisition at 053/154424Z defaulted to fine lock on FGS-3 only when FGS-1 failed to acquire. HSTAR 6359 was written. The proposals detailed in 1.15, 1.17, and 1.24 may have been affected. Scheduled Reacquisitions : 11 Successful : 11 2.2 FHST Updates: Scheduled : 54 Successful : 54 2.3 Operations Notes: A NICMOS memory monitor was set for a single bit error location at 051/1812Z. The STIS error counter was reset using ROP NS-12 at 051/2001Z. The STIS MAMA-1 MCE reset twice, at 051/190715Z and at 052/230418Z, while in the SAA and while the low voltage was on. HSTARs 6353 and 6356 were written. The recovery occurred via the SMS timeline at 053/1541Z. A NICMOS EDAC single error was recorded at 052/143555Z. No other error flags or status buffer messages were recorded. ROP NS-11 was performed at 052/1522Z to dump the error log. At 054/082055Z, while in a ZOE and outside an SAA contour, NICMOS suspended and went to boot mode while executing NICMOS proposal 7863. Parameters out of limits were: the NICMOS suspend state (NSUSTATE), the NIC bad minor frame fail (NFMFAIL), and the NIC bad mode count (NFBDMDCT). The effects on NICMOS science will be reported in the next report. HSTAR 6361 was written. The suspension is currently under investigation. Once fully understood, recovery operations will be planned. 3.0 SIGNIFICANT FORTHCOMING EVENTS: Continuation of normal science observations and calibrations. /DMH