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Daily Report #4755
HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science
DAILY REPORT****** #4755 PERIOD COVERED: 5am December 11 - 5am December 12, 2008 (DOY *************************** 346/1000z-347/1000z) OBSERVATIONS SCHEDULED ACS/SBC 11110 Searching for Lyman Apha Emission from FUSE Lyman Continuum Candidates We have recently been granted time on FUSE to characterize the escape fraction of hydrogen Lyman continuum (Lyc) photons from a morphologically diverse set of star forming galaxies. The FUSE program is designed to provide ~ 5 sigma detections of Lyc photons emitted from star forming galaxies with escape fractions ~5%. With this proposal we seek hydrogen Lyman alpha (Lya) observations of a representative subset of the FUSE program targets to constrain the observational relationship between Lyc, Lya, and hydrogen Balmer line emission in these systems. Such observations explore the detailed balance between the simple optically thin (Case A) and optically thick (Case B) limits in recombination theory. The ultimate goal of this program is to quantify the relationship between escaping Lya and Lyc emission and the first structures that form in the early universe. FGS 11942 Increasing the Accuracy of HST Astrometry with FGS1R We propose to observe six exoplanetary system host stars and two planetary nebulae central stars with FGS1r. All objects have been previously observed under proposals GO-09233, -09969, -10989, and -11210. These observations will significantly extend the time baseline, permitting improvements in the determination of proper motion. This systematic motion must be removed to get at the perturbation of interest, either due to exoplanetary companions or the orbital motion of the Earth (parallax). In most cases the perturbation orbits will also improve. We improve either companion mass or PN parallax. For one target, GJ 876, theoretical dynamical modelers have proposed an inclination closer to 50 degrees, while FGS3 measurements indicated an inclination closer to 84 degrees. These new data, once combined with our older FGS3 data, will permit an independent remeasurement of the inclination of the outermost companion, and a re-evaluation of widely used dynamical algorithms. FGS 11943 Binaries at the Extremes of the H-R Diagram We propose to use HST/Fine Guidance Sensor 1r to survey for binaries among some of the most massive, least massive, and oldest stars in our part of the Galaxy. FGS allows us to spatially resolve binary systems that are too faint for ground-based, speckle or optical long baseline interferometry, and too close to resolve with AO. We propose a SNAP-style program of single orbit FGS TRANS mode observations of very massive stars in the cluster NGC 3603, luminous blue variables, nearby low mass main sequence stars, cool subdwarf stars, and white dwarfs. These observations will help us to (1) identify systems suitable for follow up studies for mass determination, (2) study the role of binaries in stellar birth and in advanced evolutionary states, (3) explore the fundamental properties of stars near the main sequence-brown dwarf boundary, (4) understand the role of binaries for X-ray bright systems, (5) find binaries among ancient and nearby subdwarf stars, and (6) help calibrate the white dwarf mass - radius relation. FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary reports of potential non-nominal performance that will be investigated.) HSTARS: (None) COMPLETED OPS REQUEST: (None) COMPLETED OPS NOTES: (None) *********************** SCHEDULED***** SUCCESSFUL FGS GSacq************** 07***************** 07 FGS REacq************** 00***************** 00 OBAD with Maneuver **** 14***************** 14 SIGNIFICANT EVENTS: FLASH Report: The "final" expected NCS CPL Reservoir temperature setpoint adjustment was commanded to +22 degC at 345/23:03:03 UTC. Some initial signs of the onset of a flood condition were noted at 345/17:41:00 UTC following the setpoint increase to +20 degC, but the loop stabilized nicely and has been able to sustain the additional 2-degree increase since that time. Since the initial Reservoir setpoint change at 345/14:22:01 UTC, the Circulator Housing temperature (MNCIHSGT) has increased 0.75 K from 279.66 K to 280.41 K. |
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