Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.stsci.edu/~inr/thisweek1/2009/thisweek243.html
Дата изменения: Wed Sep 23 19:23:06 2009 Дата индексирования: Tue Nov 24 06:31:17 2009 Кодировка: Поисковые слова: п п п п п п п п п п п п р п р п р п |
Program Number | Principal Investigator | Program Title | Links |
11235 | Jason A. Surace, California Institute of Technology | HST NICMOS Survey of the Nuclear Regions of Luminous Infrared Galaxies in the Local Universe | Abstract |
11563 | Garth Illingworth, University of California, Santa Cruz | Galaxies at z~7-10 in the Reionization Epoch: Luminosity Functions to <0.2L* from Deep IR Imaging of the HUDF and HUDF05 Fields | Abstract |
11584 | Kristin Chiboucas, University of Hawaii | Resolving the Smallest Galaxies with ACS | Abstract |
11594 | John M. O'Meara, Saint Michaels College | A WFC3 Grism Survey for Lyman limit absorption at z=2 | Abstract |
11644 | Michael E. Brown, California Institute of Technology | A dynamical-compositional survey of the Kuiper belt: a new window into the formation of the outer solar system | Abstract |
11649 | Jean-Claude M. Gerard, Universite de Liege | Elucidating the mystery of the Io footprint time variations | Abstract |
11650 | William M. Grundy, Lowell Observatory | Mutual Orbits, Colors, Masses, and Bulk Densities of 3 Cold Classical Transneptunian Binaries | Abstract |
11657 | Letizia Stanghellini, National Optical Astronomy Observatories | The population of compact planetary nebulae in the Galactic Disk | Abstract |
11690 | Brian R. Espey, University of Dublin, Trinity College | EG And: Providing the Missing Link Required for Modelling Red Giant Mass-loss | Abstract |
11706 | Peter McCullough, Space Telscope Science Institute | The Parallax of the Planet Host Star XO-3 | Abstract |
11714 | Howard E. Bond, Space Telescope Science Institute | Snapshot Survey for Planetary Nebulae in Local Group Globular Clusters | Abstract |
11721 | Richard S. Ellis, California Institute of Technology | Verifying the Utility of Type Ia Supernovae as Cosmological Probes: Evolution and Dispersion in the Ultraviolet Spectra | Abstract |
11788 | George Fritz Benedict, University of Texas at Austin | The Architecture of Exoplanetary Systems | Abstract |
11789 | George Fritz Benedict, University of Texas at Austin | An Astrometric Calibration of Population II Distance Indicators | Abstract |
11790 | John Wisniewski, NASA Goddard Space Flight Center | HST/FGS Astrometric Search for Young Planets Around Beta Pic and AU Mic | Abstract |
GO 11235: HST NICMOS Survey of the Nuclear Regions of Luminous Infrared Galaxies in the Local Universe
GO 11650: Orbits, Masses, and Densities of Three Cold Classical Transneptunian Binaries
![]() |
The Kuiper Belt consists of icy planetoids that orbit the Sun within a broad band stretching from Neptune's orbit (~30 AU) to distance sof ~50 AU from the Sun (see David Jewitt's Kuiper Belt page for details). Over 500 KBOs (or trans-Neptunian objects, TNOs) are currently known out of a population of perhaps 70,000 objects with diameters exceeding 100 km. Approximately 2% of the known KBOs are binary (including Pluto, one of the largest known KBOs, regardless of whether one considers it a planet or not). This is a surprisingly high fraction, given the difficulties involved in forming such systems and the relative ease with which they can be disrupted. It remains unclear whether these systems formed from single KBOs (through collisions or 3-body interactions) as the Kuiper Belt and the Solar System have evolved, or whether they represent the final tail of an initial (much larger) population of primordial binaries. These issues can be addressed, at least in part, through deriving a better understanding of the composition of KBOs - and those properties can be deduced by measuring the orbital parameters for binary systems. The present proposal aims to use HST WFC3 observations to map the orbits of three binary systems. Those observations will be ued to determine the orbital period and semi-major axis and the total system mass, while the mid-infrared properties (measured by Spitzer) allow an assessment of the surface area/diameters; combining these measurements gives an estimate of the mean density. |
GO 11721: Verifying the Utility of Type Ia Supernovae as Cosmological Probes: Evolution and Dispersion in the Ultraviolet Spectra
GO 11789: An Astrometric Calibration of Population II Distance Indicators