HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT      #4795 PERIOD COVERED: 5am February 19 - 5am February 20, 2009 (DOY 050/1000z-051/1000z) OBSERVATIONS SCHEDULED WFPC2 11590 Observing the IR Catastrophe in a Deflagration Type Ia Supernova Our lack of understanding of Type Ia supernova (SN Ia) explosions limits our confidence in their use for cosmology. While there is broad agreement that these objects represent the explosions of white dwarfs, the details of ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT      #4794 PERIOD COVERED: 5am February 18 - 5am February 19, 2009 (DOY         049/1000z-050/1000z) OBSERVATIONS SCHEDULED ACS/SBC 11984 Observing Saturn's High Latitude Polar Auroras Planetary auroral emissions are critical indicators of how the magnetospheres of the planets work. Recently, a new component of Saturn's auroral emissions, i.e. high latitude auroras inside t ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT       #4793 PERIOD COVERED: 5am February 17 - 5am February 18, 2009 (DOY         048/1000z-049/1000z) OBSERVATIONS SCHEDULED ACS/SBC 11984 Observing Saturn's High Latitude Polar Auroras Planetary auroral emissions are critical indicators of how the magnetospheres of the planets work. Recently, a new component of Saturn's auroral emissions, i.e. high latitude auroras ins ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT      #4792 PERIOD COVERED: 5am February 13 - 5am February 17, 2009 (DOY 044/1000z-048/1000z) OBSERVATIONS SCHEDULED WFPC2 11986 Completing HST's Local Volume Legacy Nearby galaxies offer one of the few laboratories within which stellar populations can be tied to multi-wavelength observations. They are thus essential for calibrating and interpreting key astrophysical observables, such as broad-band luminosities, ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT       #4790 PERIOD COVERED: 5am February 11 - 5am February 12, 2009 (DOY 042/1000z-043/1000z) OBSERVATIONS SCHEDULED FGS 11706 The Parallax of the Planet Host Star XO-3 We will use HST+FGS to measure the parallax of the transiting planet host star XO-3. The resulting accurate distance measurement will provide the most accurate radius determination to date for this massive extrasolar planet (XO-3b), allowing ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT       #4789 PERIOD COVERED: 5am February 10 - 5am February 11, 2009 (DOY 041/1000z-042/1000z) OBSERVATIONS SCHEDULED WFPC2 11612 Eta Carinae's Continuing Instability and Recovery - the 2009 Event Eta Carinae is the only really observable example of structural recovery from a massive giant eruption, a "supernova imposter' event. Moreover it is the only well-observed star above 100 Msun, and its 5.5-year ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT       #4786 PERIOD COVERED: 5am February 5 - 5am February 6, 2009 (DOY 036/1000z-037/1000z) OBSERVATIONS SCHEDULED 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 sig ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT       #4785 PERIOD COVERED: 5am February 4 - 5am February 5, 2009 (DOY         035/1000z-036/1000z) OBSERVATIONS SCHEDULED FGS 11212 Filling the Period Gap for Massive Binaries The current census of binaries among the massive O-type stars is seriously incomplete for systems in the period range from years to millennia because the radial velocity variations are too small and t ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT       #4784 PERIOD COVERED: 5am February 3 - 5am February 4, 2009 (DOY         034/1000z-035/1000z) OBSERVATIONS SCHEDULED ACS/SBC 11579 The Difference Between Neutral- and Ionized-Gas Metal Abundances in Local Star-Forming Galaxies with COS The metallicity of galaxies and its evolution with redshift is of paramount importance for understanding galaxy formation. Abundances in ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT      #4782 PERIOD COVERED: 5am January 30 - 5am February 02, 2009 (DOY            030/1000z-033/1000z) OBSERVATIONS SCHEDULED WFPC2 11966 The Recent Star Formation History of SINGS Galaxies The Spitzer Legacy project SINGS provided a unique view of the current state of s ...Continue Reading