HUBBLE SPACE TELESCOPE DAILY REPORT #2392 PERIOD COVERED: 0000Z (UTC) 06/11/99 - 0000Z (UTC) 06/14/99 Daily Status Report as of 165/0000Z 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed FGS 8319 (Masses and Distances of Pre-Main Sequence Binaries) The Fine Guidance Sensors were used to make astrometric observations of the pre-main sequence binary star system ROX-42B. Observations were also made of several reference stars. Our goal is to measure the masses of low mass young stars. This will enable a calibration of theoretical calculations of stellar evolution to the main sequence. The observations were completed as planned and no problems were reported. 1.2 Completed Seven Sets of WF/PC-2 8090 (POMS Test Proposal: WF-II Parallel Archive Proposal Continuation) The WF/PC-2 was used in the parallel mode to make some low galactic latitude archive observations. The program will be used to take parallel images of random areas of the sky. The observations were executed as scheduled, and no anomalies were noted. 1.3 Completed Eight Sets of STIS/CCD 8406 (POMS Test Proposal: STIS Non-Scripted Parallel Proposal Continuation V) The Space Telescope Imaging Spectrograph (CCD) was used to make high galactic latitude observations taken in parallel with the prime science observations as part of a POMS proposal. This is a STIS non-scripted parallel Condition V proposal. The observations were completed as scheduled, and no anomalies were reported. 1.4 Completed Eleven Sets of WF/PC-2 7712 (WF/PC-2 Cycle 7 Supplemental Darks pt2/3) The WF/PC-2 was used to make a series of Cycle 7 supplemental calibration darks. This dark calibration program obtains 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. 1.5 Completed Four Sets of STIS/CCD 7949 (CCD Dark and Bias Monitor -- Cont. to June 99) The Space Telescope Imaging Spectrograph (CCD) was used to conduct a CCD dark calibration and a bias monitoring program. It was also scheduled to 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. 1.6 Completed STIS/CCD/MA1 7402 (Chromospheric Activity in Old Stars: Halo Subdwarfs' Variability) The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make observations of the old sub-dwarf star HD194598 in order to study its chromospheric activity. All normal stars cool enough to have convection zones share a common minimum level of chromospheric activity which decreases with advancing spectral type; most show higher emission levels which vary with time. A wavelength calibration observation was also taken. The observations were executed as scheduled, and no anomalies were noted. 1.7 Completed FOC/96/WF/PC-2 7274 (Secular Changes in the Jet of M-87) The Faint Object Camera (f/96) and the WF/PC-2 were both used to make observations of the secular changes in the jet coming off of the active galactic nuclei of galaxy M-87. Past observations with the FOC have shown changes as small as 0.03", and provide a unique opportunity to study proper motions and structural changes of the jet. An internal flat calibration image was also taken. The observations were completed as scheduled, and no anomalies were reported. 1.8 Completed STIS/CCD/MA1 7272 (Helium Absorption by Protogalactic Gas) The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make observations of PKS1935-69. These observations will provide substantially improved S/N and substantially reduced geocoronal contamination compared with extant GHRS spectra, providing a much more secure measure of both discrete cloud and diffuse IGM contributions to the He-II opacity in this sightline. A wavelength calibration image was also taken. The observations were completed as planned, and no problems were reported. 1.9 Completed Five Sets of WF/PC-2 8053 (WF/PC-2 Cycle-7 Earth Flats -- Part II) The WF/PC-2 was used to take Earth flat calibration images. This proposal obtains sequences of Earth streak flats to construct high quality flat fields for the WF/PC-2 filter set. The observations were executed as scheduled, and no anomalies were noted. 1.10 Completed WF/PC-2/STIS/CCD 7615 (Determination of the Mass Function of a Globular Cluster Through Gravitational Microlensing) The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were used to make gravitational microlensing observations of the large globular cluster NGC-6656 located in Sagittarius in order to study its mass function. Gravitational microlensing offers a unique and direct method of determining the masses of stars and other compact objects down to planetary masses. A bias and dark calibration observations were also taken. The observations were completed as planned, and no problems were reported. 1.11 Completed 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, and no problems were reported. 1.12 Completed WF/PC-2 8178 (Tracking the Evolution of the Homunculus and Outer Debris in Eta Carinae) The WF/PC-2 was used to make observations to be used in tracking the evolution of the homunculus and outer debris in Eta Carinae. Because many groups around the world who are working on different facets of Eta Carinae will be interested in these images, we waive the proprietary rights to the dataset in order to maximize its usage. The observations were executed as scheduled, and no anomalies were noted. 1.13 Completed WF/PC-2 7282 (A Continuing Snapshot Survey for Compact Stellar Groups and Clusters around Wolf-Rayet Stars) The WF/PC-2 was used to make observations of the Wolf-Rayet star WR18 as part of a continuing snapshot survey of compact stellar groups and clusters. The newly-imaged clusters allow us to accurately determine the distances, luminosities, and ages of the WR members. The observations were executed as scheduled, and no anomalies were noted. 1.14 Completed WF/PC-2 7504 (Calibration of Nearby Type Ia Supernovae as Standard Candles: The Next Three-Year Step) The WF/PC-2 was used to make observations of parent galaxy NGC-4527 in order to determining its Cepheid distance. This is to continue the calibration of the Type 1a supernova as standard candles. The observations were completed as planned, and no problems were reported. 1.15 Completed Three Sets of STIS/CCD 8470 (POMS Test Proposal: STIS Non-Scripted Parallel Proposal Continuation V) The Space Telescope Imaging Spectrograph (CCD) was used to make high galactic latitude observations taken in parallel with the prime science observations as part of a POMS proposal. This is a STIS non-scripted parallel Condition VI proposal. The observations were completed as scheduled, and no anomalies were reported. 1.16 Completed Two Sets of WF/PC-2 7406 (High-Resolution Imaging of Ejecta Knots in the Cassiopeia A SNR) The WF/PC-2 was used to make high resolution images of the ejecta knots and jets in the Cassiopeia-A Super nova remunerate. Of particular interest is the nature of several knots which show elongated shapes or faint, clumpy trailing emission which could be evidence of mass ablation due to the interaction with ambient circumstellar/interstellar medium. The observations were completed as planned, and no problems were reported. 1.17 Completed Three Sets of STIS/CCD 8081 (STIS CCD Hot Pixel Annealing) The Space Telescope Imaging Spectrograph (CCD) was used to make a dark and a bias calibration observation. The effectiveness of the CCD hot pixel annealing process is assessed by measuring the dark current behavior before and after annealing and by searching for any window contamination effects. The observations were executed as scheduled, and no anomalies were noted. 1.18 Completed WF/PC-2 8200 (Globular Cluster Systems in Three Giant Coma Ellipticals) The WF/PC-2 was used to make observations of the giant Coma elliptical galaxy NGC-4926 in order to study its globular clusters. What we know about the Coma ellipticals so far present serious challenges to virtually every one of the current formation scenarios for globular cluster systems. The observations were executed as scheduled, and no anomalies were noted. 1.19 Completed Two Sets of WF/PC-2 7281 (Snapshot Survey of the B2 Sample of Radio Galaxies) The WF/PC-2 was used to make snapshot survey observations of the B2 sample radio galaxies B2+0924+30 and B2+1003+26. This program is aimed to answer the following key questions: How common are extended nuclear disks? What is their orientation and morphology? How common are optical jets? The observations were executed as scheduled, and no anomalies were noted. 1.20 Completed WF/PC-2 8095 (Accurate Proper Motions of Galactic Halo Populations) The WF/PC-2 was used to make observations of the galaxy NGC-5272 in order to study the proper motion of its galactic halo population, which include globular clusters and dwarf galaxies. The proper motions of these populations will be determined to unprecedented accuracy, approximately an order of magnitude better than has been previously possible. The observations were executed as scheduled, and no anomalies were noted. 1.21 Completed STIS /MA1 7508 (Ultraviolet Line Eclipses by Extrasolar Planets) The Space Telescope Imaging Spectrograph (MA1) were used to make observations of star HD217015 in order to obtain ultraviolet line eclipses by extrasolar planets. One of the most exciting events in astronomy last year was the discovery of extrasolar planets. A wavelength calibration image was also taken. The observations were completed as planned, and no problems were reported. 1.22 Completed WF/PC-2 6671 (Deep V, I Photometry for 20 M31 Globular Clusters) The WF/PC-2 was used to make deep photometry observations (V=27.5) of the globular cluster M-31-G119 which is located in the Andromeda Galaxy (a.k.a., M-31). The observations were executed as planned, and no problems were reported. 1.23 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal - Nearby Galaxies - Imaging and Spectroscopy) The Space Telescope Imaging Spectrograph (CCD) was used to make parallel observations of nearby galaxies. This survey will be useful to study the star formation histories, chemical evolution, and distances to these galaxies. These data will be placed immediately into the Hubble Data Archive. The observations were completed as scheduled, and no problems were reported. 2.0 FLIGHT OPERATIONS SUMMARY 2.1 Guide Star Acquisitions: Scheduled Acquisitions : 17 Successful : 17 Scheduled Reacquisitions : 29 Successful : 29 2.2 FHST Updates: Scheduled : 44 Successful : 43 The FHST update at 164/171923Z was unsuccessful. 2.3 Operations Notes: The SMS for the upcoming week was reviewed on Friday. Several specially scheduled supports were not available for day 165, so SSA supports, covering 52 minutes, were requested and provided. Using ROP SR-1, the SSR EDAC error counter was cleared eight times. Throughtout the weekend the SSA transmitter was turned on and off manually four times in order to avoid science data loss. The NICMOS FPA detector #3 temperature sensor was enabled at 162/1846Z as directed by an operations request. Per an operations note, the battery #5 current had its limits changed at 162/2202Z to accommodate the open +E SPA in section 5. A full DF-224 dump was performed at 164/0412Z per ROP DF-1. Per ROP NS-12, a SI C&DH error was reset ar 164/1752Z. The engineering tape recorder) ETR was commanded manually at 164/2334Z and at 165/0016Z as directed by ROP RD-4. The ETR was played back at 165/0020Z per ROP RD-1. The NSSC-1 status buffer was dumped at 165/0036Z. 3.0 SIGNIFICANT FORTHCOMING EVENTS: Continuation of normal science observations and calibrations. /DMH