. | . |
First global topographic model of Mercury by Staff Writers Laurel MD (SPX) May 10, 2016
The MESSENGER mission has released the first global digital elevation model (DEM) of Mercury, revealing in stunning detail the topography across the entire innermost planet and paving the way for scientists to characterize fully the planet's geologic history. The global topographic model was among three new products released by the Planetary Data System (PDS), an organization that archives and distributes all of NASA's planetary mission data. With this 15th and last major data release, the MESSENGER mission has shared more than 10 terabytes of Mercury science data, including nearly 300,000 images, millions of spectra, and numerous map products, along with interactive tools that allow the public to explore those data, notes Susan Ensor, who for the last nine years has managed the MESSENGER Science Operations Center, which oversees the collection of these data. "The wealth of these data, greatly enhanced by the extension of MESSENGER's primary one-year orbital mission to more than four years, has already enabled and will continue to enable exciting scientific discoveries about Mercury for decades to come," said Ensor, a software engineer at the Johns Hopkins University Applied Physics Laboratory (APL), in Laurel, Maryland.
The First Global Topography of the Innermost Planet The new product reveals a variety of interesting topographic features, as shown in the animation above, including the highest and lowest points on the planet. The highest elevation on Mercury is at 4.48 kilometers above Mercury's average elevation, located just south of the equator in some of Mercury's oldest terrain. The lowest elevation, at 5.38 kilometers below Mercury's average, is found on the floor of Rachmaninoff basin, a basin suspected to host some of the most recent volcanic deposits on the planet. More than 100,000 images were used to create the new model. During the orbital phase of the MESSENGER mission, images were acquired with a large range of viewing geometries and illumination conditions, which enabled the topography across Mercury's surface to be determined. "This is the largest control network ever processed using the Integrated Software for Imagers and Spectrometers of the U. S. Geological Survey (USGS)," explained MESSENGER team member and USGS computer scientist Kris Becker. The control network refers to the effort to register all of the images to each other, a step necessary to create the DEM. "This DEM complements many of the other MESSENGER products and enhances the cartographic maps, and collectively they provide a wealth of new information about Mercury for further study," he added. To view the full topographic map with Mercury features labeled, visit this USGS website.
Revealing the Colors of Mercury's Northern Volcanic Plains "MESSENGER had previously discovered that past volcanic activity buried this portion of the planet beneath extensive lavas, more than a mile deep in some areas and covering a vast area equivalent to approximately 60% of the continental United States," said APL's Nancy Chabot, the Instrument Scientist for the Mercury Dual Imaging System (MDIS). However, because this region is near Mercury's north pole, the Sun is always low on the horizon, casting many long shadows across the scene that can obscure the color characteristics of the rocks. Consequently, MDIS carefully captured images of this portion of the planet when the shadows were minimized through five different narrow-band color filters. In the newly map released Mercury's northern volcanic plains are revealed in striking color, as shown in the image below. "This has become one of my favorite maps of Mercury," Chabot added. "Now that it is available, I'm looking forward to it being used to investigate this epic volcanic event that shaped Mercury's surface."
Improved Products and MESSENGER's Legacy "The global XRS elemental composition maps are the culmination of a tremendous amount of effort on the part of the MESSENGER team and represent the first such global maps of any planetary body derived from X-ray fluorescence spectroscopy," said MESSENGER Deputy Principal Investigator Larry Nittler of the Carnegie Institution for Science. "They reveal a remarkable range of chemical heterogeneity on the planet's surface, in some places correlated with other mapped quantities such as topography or color and in some places not. As such, they provide a unique dimension to teasing out Mercury's origin and geological history." Though MESSENGER's orbital operations ended about one year ago, today's data release is one of the most important milestones for the project. Archiving the extensive MESSENGER data sets in NASA's PDS is a lasting legacy of the mission. "During its four years of orbital observations, MESSENGER revealed the global characteristics of one of our closest planetary neighbors for the first time," offered MESSENGER Principal Investigator Sean Solomon, Director of Columbia University's Lamont-Doherty Earth Observatory. "MESSENGER's scientists and engineers hope that data from the mission will continue to be utilized by the planetary science community for years to come, not only to study the nature of the innermost planet, but to address broader questions about the formation and evolution of the inner Solar System more generally." All data sets in this MESSENGER release can be accessed from here, and all of the MESSENGER data archived at the PDS are available here.
Related Links MESSENGER News Flash at Mercury Mars News and Information at MarsDaily.com Lunar Dreams and more
|
|
The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us. |