Hubble Space Telescope Daily Report #2793 01/24/01
HUBBLE SPACE TELESCOPE
DAILY REPORT #2793
PERIOD COVERED: 0000Z (UTC) 01/23/01 – 0000Z (UTC) 01/24/01
Daily Status Report as of 024/0000Z
1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:
1.1 Completed Two Sets of WF/PC-2 8827 (Cycle 9 Supplemental Darks pt2/3)
The WF/PC-2 was used to obtain three dark frames every day to provide data for monitoring and characterizing the evolution of hot pixels. The proposal completed nominally.
1.2 Completed WF/PC-2/STIS/CCD 8559 (The Role of Dark Matter in Cluster Formation and Galaxy Evolution)
The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were used to observe the outer regions of massive clusters that represent transitional areas of great cosmological importance where field galaxies encounter the steep potential wells of dark matter and baryonic hot gas. Little is known about either the dark matter profile at large radii or the morphological properties of infalling galaxies at those redshifts where strong evolution is observed in the cluster cores. The proposal completed normally, with no reported problems.
1.3 Completed Two Sets of STIS/CCD 8837 (CCD Dark Monitor-Part 1)
The Space Telescope Imaging Spectrograph (CCD) was used to monitor the darks. The proposal completed with no reported problems.
1.4 Completed FGS/1 8319 (Masses and Distances of Pre-Main Sequence Binaries)
Fine Guidance Sensor #1 was used to make astrometric observations of the pre-main sequence binary star system DF-Tau. 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.
1.5 Completed Two Sets of STIS/CCD 8562 (Probing the Large Scale Structure: Cosmic Shear Observations)
The Space Telescope Imaging Spectrograph (CCD) was used to probe the distortion of light bundles from distant galaxies, looking at the statistical properties of the intervening inhomogeneous {dark} matter distribution. The proposal completed nominally.
1.6 Completed STIS/CCD 8663 (Survey of SMC Planetary Nebulae: Nebular and Stellar Evolution in a Low- Metallicity Environment)
The Space Telescope Imaging Spectrograph (CCD) was used to survey of SMC planetary nebulae {PNe} in order to study the co-evolution of the nebulae and their central stars, in an environment that is chemically very metal poor. We will obtain STIS imaging and medium-resolution slitless spectroscopy that will yield line fluxes and nebular morphologies in important emission lines, plus magnitudes of the central stars. From these data we will gather a harvest of information: the nebular size, morphology, ionization structure, density, and mass; and the central star temperature, luminosity, and mass. The proposal completed with no reported anomalies.
1.7 Completed Two Sets of STIS/CCD/MA1 8108 (Search for the Origin of Supersonic Turbulence Observed in the Upper Equatorial Atmosphere of JupiterP
The Space Telescope Imaging Spectrograph (CCD and MA1) was used to observe Jupiter, which like the Sun, sustains a coronal region at the top of its atmosphere. H-Ly-alpha spectra measured by GHRS in the Jovian Ly-alpha bulge region, evidenced a non thermal line broadening, implying supersonic atomic motions and variability on a time scale of about one minute. As described in 2.1 and HSTAR 8057, the acquisition for the first iteration of this proposal defaulted to fine lock backup on one FGS only, possibly affecting nine observations. Then, as described in 2.1 and HSTAR 8058, the acquisition for the second iteration of this proposal defaulted to fine lock backup on one FGS only, possibly affecting six
observations. Otherwise, the observations completed with no further reported problems.
1.8 Completed STIS/CCD 8838 (Bias Monitor – Part 1)
The Space Telescope Imaging Spectrograph (CCD) was used to monitor the bias in the 1×1, 1×2, 2×1, and 2×2 bin settings at gain=1, and 1×1 at gain = 4, to build up high-S/N superbiases and track the evolution of hot columns. The proposal completed nominally.
1.9 Completed Two Sets of STIS/CCD 8623 (HST, Chandra, and FUSE Studies of Interstellar Material toward HD 24534 {aka X Persei})
The Space Telescope Imaging Spectrograph (CCD) was used to make high-resolution UV spectroscopic observations of the reddened star HD 24534 {aka X Persei}, in order to: {1} establish accurate gas-phase column densities for elements other than carbon and oxygen {for which high- quality data already exist}, for the purpose of deriving {in conjunction with FUSE and Chandra observations} absolute depletions of several key elements; and {2} further pursue molecular abundances toward this star, to supplement HST/GHRS data obtained earlier which showed that this line of sight supports a rich chemistry. The observations completed nominally.
1.10 Completed Two Sets of WF/PC-2 8823 (Decontaminations and Associated Observations Pt. 2/4)
The WF/PC-2 was used for the monthly WFPC2 decons. Also included were instrument monitors tied to decons: photometric stability check, focus monitor, pre- and post-decon internals {bias, intflats, kspots, & darks}, UV throughput check, VISFLAT sweep, and internal UV flat check. As described in 2.1 and HSTAR 8058, the acquisition for the second iteration of this proposal defaulted to fine lock backup on one FGS only, possibly affecting seven observations. Otherwise, there were no further reported problems.
1.11 Completed STIS/MA1 8843 (Cycle 9 MAMA Dark Measurements)
The Space Telescope Imaging Spectrograph (MA1) was used to perform the routine monitoring of the MAMA detector dark noise. The proposal completed nominally.
1.12 Completed WF/PC-2 8602 (A Snapshot Survey of the Sites of Recent, Nearby Supernovae)
The WF/PC-2 was used to conduct a snapshot survey in V and I of the sites of the nearby SNe, which have precisely known positions, to obtain high-resolution information on their local environment. The proposal completed with no reported problems.
2.0 FLIGHT OPERATIONS SUMMARY:
2.1 Guide Star Acquisitions:
Scheduled Acquisitions: 10
Successful: 10
The acquisition at 023/110700Z defaulted to fine lock backup on FGS-1 only when there was a walkdown failure on FGS-3. HSTAR 8057 was written. The proposal detailed in 1.7 may have been affected.
The acquisition at 023/191227Z defaulted to fine lock backup on FGS-1 only when the scan step limit was exceeded on FGS-3. HSTAR 8058was written. The proposals detailed in 1.7 and 1.10 may have been affected. Scheduled Re-acquisitions: 6
Successful: 6
2.2 FHST Updates:
Scheduled: 19
Successful: 19
2.3 Operations Notes:
The SSR EDAC error counter was cleared three times per ROP SR-1A.
Operations personnel, in addition to supporting day-to-day operations, also participated in GSFC Internal Simulation #4 (EVA-3) for approximately fifteen hours today.
3.0 SIGNIFICANT FORTHCOMING EVENTS:
Gyro #6 is scheduled to be powered on at
024/2229Z. Reconfiguration of Gyro #6 in the shadow mode should occur at 025/0321Z.
Continuation of normal science observations and calibrations.
