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While these are exciting developments scientifically, they have, more importantly, exposed a potentially catastrophic threat to NASA's New Horizons (NH) spacecraft as it passes through Oxazepam (Oxazepam Tablets)- Multum Pluto system in July 2015-i. We propose a Director's Discretionary Time (DDT) program comprised of 34 orbits of Hubble observations for our time-critical need in 2012 to investigate potential hazards to NASA's New Horizons spacecraft as it flies through the Pluto system in July 2015, and to certify potential new trajectory options for the NH mission if it must "bail out" to a safe haven.

The results from this Hubble DDT program will be unique and will have profound implications for the New Horizons mission, a top scientific priority of the last NASA Planetary Decadal Survey. Although each problem is tied to a particular data set and a particular ring system, the phenomena to be studied have relevance to all ring-moons systems and, more broadly, to the dynamics of astrophysical disks.

This work supports NASA's strategic goal to advance scientific knowledge of the origin and history of the Solar System, and the PGG program's goal to support analysis of data from planetary missions that are in public archives for investigations into the dynamical evolution of the planets, satellites, small Solar System bodies, and ring systems.

Our key data sets on the Jovian ring system---from Voyager, Galileo, Cassini, HST and now New Horizons, span a time baseline of 28 years. Using this combined information, we will investigate the spatial and temporal variations within the rings to understand the dynamics, evolution and origin of the system. We will quantify the level of the changes observed and try Oxazepam (Oxazepam Tablets)- Multum understand the cause.

We will determine whether their non-detection by New Horizons is due to instrumental limitations or genuine changes in the ring, and will explore a variety of possible explanations. This work supports NASA's strategic goal to "advance scientific knowledge of the origin and history of the solar system. We will study rings D, E, F and G, plus dusty material in several ring gaps and debris found in the orbits of several small moons. Such rings operate in distinctive dynamical regimes, responding to a variety of gravitational and non-gravitational forces.

They can change on time scales ranging from weeks to years, enabling us to study their evolution in real time. This project will build off of work we initiated under our predecessor CDAP grant, and will enable us explore recent discoveries that reveal these rings to be even more complex and dynamic than anyone had expected. The proposed Oxazepam (Oxazepam Tablets)- Multum will also allow us to refine our techniques for deriving model-independent constraints on particle sizes, as well as to develop various analytical and numerical models to describe the observed structures.

Hubble is uniquely qualified to Oxazepam (Oxazepam Tablets)- Multum these time-critical objectives, which we hope to achieve before the Pluto system enters the Hubble solar exclusion zone in early November. Small moons are usually accompanied by rings of faint dust, which arise from impacts into their surfaces. Such rings show interesting dynamics including the influence of non-gravitational forces such as radiation pressure and Poynting-Robertson drag.

A previous search for rings of Pluto in HST images was negative, but was limited by Oxazepam (Oxazepam Tablets)- Multum scattered light from Pluto and Charon. If Pluto sports a ring comparable Oxazepam (Oxazepam Tablets)- Multum the major dust rings of the giant planets, our observing plan should detect it.

This work supports Oxazepam (Oxazepam Tablets)- Multum New Horizons mission by potentially revealing a dust hazard that might endanger the spacecraft during its 2015 flyby. It could also enhance the science return by allowing planners to target a known feature rather than conducting a more resource-intensive general search for rings. We archive, catalog and distribute Oxazepam (Oxazepam Tablets)- Multum related to the rings and inner satellite systems of all four giant planets.

The major emphasis in our next five years will be on supporting the Cassini Mission to Saturn. We will also support the planning, archiving and analysis of ring observations by New Horizons during its Jupiter flyby in early 2007, and by Earth-based observers during a rare Uranian ring plane crossing in 2007. We will continue to enhance our support for older data sets from Voyager, Galileo, Hubble, and epiduo observatories.

Data types to be supported include images, occultation profiles, spectra, image cubes, radar maps, charged particle absorption data, and higher-level data products derived from all of the above. We will also revise and enhance our popular Oxazepam (Oxazepam Tablets)- Multum singulair side effects, containing educational information and ephemeris do antibiotics expire, as well as continue to answer questions and support special requests from users.

Our study will also reveal any broad, faint rings with optical depth 10-6, comparable to those now known to encircle all of the other giant planets. Such rings reveal a variety of physical processes that are masked within denser rings: non-gravitational forces deflect Trodelvy (Sacituzumab Govitecan-hziy for Injection, for IV Use)- FDA grains from their Oxazepam (Oxazepam Tablets)- Multum paths and can sweep grains out of the system, requiring embedded (and often unseen) "parent" bodies to replenish the visible dust.

Faint rings are prevalent throughout the Solar System and also serve as analogs for stages in the formation of planetary systems. Cassini data provide a unique new opportunity to understand this particular class of dynamical system.

Because grains are small in size and number, modest events can trigger large visible changes. Hence, these are the most time-variable rings known. Comparison with Voyager data will reveal processes at work for the last 25 years, and Cassini data alone will show Oxazepam (Oxazepam Tablets)- Multum changes in real time.

Saturn has the Solar System's most diverse set of faint rings. The innermost D ring contains several narrow ringlets surrounded by broader belts. The F ring, just outside the main rings, is dominated by clumps and "braids," some of which come and go Oxazepam (Oxazepam Tablets)- Multum time scales of weeks.

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