SUN GLINTS OFF TITAN'S POLAR SEAS

FROM:  NASA 

This near-infrared, color mosaic from NASA's Cassini spacecraft shows the sun glinting off of Titan's north polar seas. While Cassini has captured, separately, views of the polar seas (see PIA17470) and the sun glinting off of them (see PIA12481 and PIA18433) in the past, this is the first time both have been seen together in the same view. The sunglint, also called a specular reflection, is the bright area near the 11 o'clock position at upper left. This mirror-like reflection, known as the specular point, is in the south of Titan's largest sea, Kraken Mare, just north of an island archipelago separating two separate parts of the sea. This particular sunglint was so bright as to saturate the detector of Cassini's Visual and Infrared Mapping Spectrometer (VIMS) instrument, which captures the view. It is also the sunglint seen with the highest observation elevation so far -- the sun was a full 40 degrees above the horizon as seen from Kraken Mare at this time -- much higher than the 22 degrees seen in PIA18433. Because it was so bright, this glint was visible through the haze at much lower wavelengths than before, down to 1.3 microns. The southern portion of Kraken Mare (the area surrounding the specular feature toward upper left) displays a "bathtub ring" -- a bright margin of evaporate deposits -- which indicates that the sea was larger at some point in the past and has become smaller due to evaporation. The deposits are material left behind after the methane & ethane liquid evaporates, somewhat akin to the saline crust on a salt flat. The highest resolution data from this flyby -- the area seen immediately to the right of the sunglint -- cover the labyrinth of channels that connect Kraken Mare to another large sea, Ligeia Mare. Ligeia Mare itself is partially covered in its northern reaches by a bright, arrow-shaped complex of clouds. The clouds are made of liquid methane droplets, and could be actively refilling the lakes with rainfall. The view was acquired during Cassini's August 21, 2014, flyby of Titan, also referred to as "T104" by the Cassini team. The view contains real color information, although it is not the natural color the human eye would see. Here, red in the image corresponds to 5.0 microns, green to 2.0 microns, and blue to 1.3 microns. These wavelengths correspond to atmospheric windows through which Titan's surface is visible. The unaided human eye would see nothing but haze, as in PIA12528. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. JPL, a division of the California Institute of Technology, Pasadena, manages the mission for NASA's Science Mission Directorate in Washington. The VIMS team is based at the University of Arizona in Tucson.  Image Credit: NASA/JPL-Caltech/University of Arizona/University of Idaho.

TITAN AND MULTINATIONAL MISSILE DEFENSE

 

Nimble Titan, a series of two-year experimentation campaigns, promotes multinational cooperation and interoperability in missile defense activities and, when required, responses. Here, U.S. soldiers deployed with a Patriot missile battery to help defend Turkey's border with Syria are part of a coordinated NATO response that includes missile defenders from Germany and the Netherlands, Feb. 4, 2013. DOD photo by Glenn Fawcett

FROM:  U.S. DEPARTMENT OF DEFENSE
Nimble Titan Increases Multinational Missile Defense Cooperation

By Donna Miles
American Forces Press Service

WASHINGTON, May 16, 2013 - When the United States, Germany and the Netherlands deployed missile defenses to Turkey to augment the Turkish military's capabilities near the Syrian border, it wasn't happenstance that they were able to quickly coordinate their efforts and go operational.

U.S. Strategic Command has led an international effort for the past eight years to promote cooperation and interoperability in missile defense, not just among NATO allies, but also around the globe.

Known as Nimble Titan, it's a series of two-year experimentation campaigns that bring together 22 nations to address missile defense challenges in the coming decade, said Army Col. Michael Derrick, director of allied integration for Stratcom's Joint Functional Component Command for Integrated Missile Defense.

Nimble Titan is now in its fourth two-year iteration, with a mix of seminars, tabletop exercises, war games and instrumented experiments, Derrick explained during a telephone interview from his office at Schriever Air Force Base, Colo.

All are aimed at promoting partnership Derrick called essential to standing up to ballistic missile threats.

Each participating nation realizes that none can go it alone in missile defense, he said. That includes nations such as the United States, Japan and the Netherlands, among others that have their own missile defense systems, he added. The U.S. system, for example, depends in part on basing sensors and interceptors in other countries and using their airspace and ground facilities to operate.

"As the United States developed its own ballistic missile defense system, we realized that the system is inextricably engaged with our allies around the world," Derrick said. "Integration with our allies around the world in the field of missile defense is absolutely necessary. We simply cannot do this without them."

But international cooperation brings more to the effort, he said, increasing transparency about missile defense and setting the conditions for nations to share information and leverage one another's assets. This may save money at a time when many militaries are experiencing severe budget cutbacks, while providing more comprehensive missile defenses, he noted.

Collaboration is particularly vital at a time when several nations as well as non-state actors are ratcheting up the threat. "We have those nations that consistently threaten us, either with real capability or with rhetoric," Derrick said.

"Nimble Titan creates an environment where these likeminded nations can discuss and try to solve the challenges that we have now or anticipate that we will have in the next 10 years," he said. "Instead of doing things independently against a common foe, we are able to work together."

Through Nimble Titan events, participants explore ways to improve information-sharing and distribution and develop plans, including command-and-control procedures, to provide coordinated, synchronized missile defenses.

"We discuss concepts of operation such as how to put the capabilities from different nations together to build a coherent and effective unit," Derrick said. "The goal is to put mechanisms in place to optimize those international efforts."

Nimble Titan 14, latest in the series of campaigns, kicked off in February with an orientation seminar for new participants at the NATO headquarters in Brussels. In March, Japan hosted a planning exercise among Asia-Pacific countries focused on the Northeast Asia threat.

Participants from the Tokyo event will converge on the Naval Postgraduate School in Monterey, Calif., in June for a tabletop exercise based on groundwork laid at the planning exercise, Derrick said.

Another tabletop exercise, focused on the Southwest Asia threat, is slated for December at Ramstein Air Base in Germany.

The most significant takeaways from these individual events will be incorporated into the Nimble Titan 14 capstone event planned for next spring in Suffolk, Va. "This will be a program that allows nations from around the world to see the global implications of what is going on in each region," Derrick said.

Although Nimble Titan isn't designed to address any particular threat, and activities all involve notional perpetrators, sometimes the events correspond with those in the real world.

Last year, for example, the capstone event for the Nimble Titan 12 series kicked off just four days after North Korea's failed three-stage missile launch. Over the course of four days, participants and observers planned military, as well as political and civil defense responses, to mock launches a decade into the future from the fictitious countries of Seac and Rubicon.

But Derrick said the cooperation developed during Nimble Titan has a huge payoff when real-world challenges develop.

"You can't work with a nation until you have some basis upon which to build that cooperation. And through Nimble Titan, we have a group of people, now in 22 nations, who know the topic, who know one another, and who know the challenges we all face," he said. "We have been very successful in building a cadre of people around the world who can work together."

This assures U.S. allies of the United States' commitment to standing with them in missile defense. "We want them to know that we are not only willing, but able to work with them," Derrick said.

But even more importantly, he said, is its deterrent effect -- one Derrick said every participating nation can agree to.

"Missile defense is an important deterrent because it doesn't threaten and can't hurt anyone," he said. "If someone launches a missile at you, being able to destroy that missile in space and cause no damage or harm whatsoever gives you the moral high ground. You have defended yourself, but you haven't caused your attacker any harm."

This makes missile defense an important complement to U.S. Strategic Command's other assets, most of which have offensive capabilities, he said.

One of its greatest advantages, Derrick said, is that it provides the opportunity for informed, coordinated responses.

"It gives our leadership at the national level a whole lot of options that otherwise would not be available: to pursue diplomatic outcomes, to arrange responses with other nations, or to go to the United Nations if they need to," he said. "That's one of the real advantages of missile defense. It provides options and time for the leadership that otherwise would not be available."

VIDEO OF THE HUYGENS PROBE LANDING ON TITAN

FROM: NASA

 When Huygens Met Titan

This animation re-creates the final descent of ESA's Huygens probe as it landed on Titan on Jan. 14, 2005, after it was dropped off by NASA's Cassini spacecraft.

LAKE LEVELS ON TITAN

FROM: NASA

Titan's Lake District, One Season Later
These images obtained by NASA's Cassini spacecraft show Titan's stable northern lake district. Cassini's radar instrument obtained the recent images on May 22, 2012. It observed some previously unseen regions but also some regions containing lakes that were last observed about six years-nearly one Titan season--ago. This marks the longest time interval between lake observations in the northern hemisphere.

The top image here shows part of the radar swath from May 22, 2012, centered near 79 degrees north latitude, 58 degrees west longitude, and about 220 by 47 miles (350 by 75 kilometers) in dimension. At the bottom, parts of this image are compared with those obtained in 2006. (The images appear slightly different from previous releases because they use a new filtering technique). In 2006, it was winter in the northern hemisphere and the lakes were in the dark. Although Titan spring began in 2009 and the sun has now risen over the lakes, there is no apparent change in lake levels since the 2006 flybys, consistent with climate models that predict stability of liquid lakes over several years. This shows that the northern lakes are not transient weather events, in contrast to the temporary darkening of parts of the equator after a rainstorm in 2010 (PIA 12819).

Changes in lake levels may still be detected later in the mission as Cassini continues to observe these high northern latitudes into the beginning of summer in 2017. At that point, the sun may cause evaporation. However, the lack of significant change over six years sets important constraints for climate models and the stability of liquids on Titan. Illumination is coming from the bottom.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, DC. The Cassini orbiter was designed, developed and assembled at JPL. The radar instrument was built by JPL and the Italian Space Agency, working with team members from the United States and several European countries. Image Credit: NASA/JPL-Caltech/ASI

A PAIR OF MOONS NEAR SATURN

FROM: NASA
Saturn's MoonsThe Cassini spacecraft watches a pair of Saturn's moons, showing the hazy orb of giant Titan beyond smaller Tethys. This view looks toward the Saturn-facing sides of Titan (3,200 miles, or 5,150 kilometers across) and Tethys (660 miles, or 1,062 kilometers across).

The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on Oct. 18, 2010. The view was obtained at a distance of approximately 1.6 million miles (2.5 million kilometers) from Titan and at a Sun-Titan-spacecraft, or phase, angle of 55 degrees. The view was obtained at a distance of approximately 930,000 miles (1.5 million kilometers) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 55 degrees. Image scale is 15 kilometers (9 miles) per pixel on Titan and 6 miles (9 kilometers) per pixel on Tethys.

Image Credit: NASA/JPL/Space Science Institute