Subscribe to our free daily newsletters
  Space Travel News  




Subscribe to our free daily newsletters



MESSENGER Trajectory Mastermind Honored For Computation

Upon arrival at Mercury in March of 2011 the spacecraft will enter an elliptical orbit that passes as close as 200 kilometers to Mercury's far northern surface every 12 hours.
by Staff Writers
Washington DC (SPX) Jun 09, 2008
Jim McAdams, the MESSENGER mission design lead engineer, was named the 2008 Engineer of the Year by the Baltimore Section, American Institute of Aeronautics and Astronautics (AIAA). Each spring, this chapter of AIAA honors those in the aerospace community who have made significant contributions during the previous year.

McAdams of the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Md., "optimized the trajectory and maneuver schedule, designing one of the most challenging planetary missions in history," said APL's Tom Strikwerda, who on May 28 presented the award: a plaque and a 24-inch-high trophy that McAdams will keep until passing it on to the next winner a year from now.

Because Mercury lies deep within the Sun's gravity well, travel to the planet requires an extremely large velocity change. A spacecraft travelling to Mercury speeds up as it falls toward the Sun; so MESSENGER's trajectory had to be designed to most effectively utilize the gravitational pull of Venus and Mercury to achieve most of the required velocity change.

To make the trip possible, the trajectory uses six gravity-assist flybys: one by Earth, two by Venus, and three by Mercury. These gravity-assists, along with five large course-correction maneuvers, reduce the energy (and thus fuel) requirements but greatly prolong the trip. These maneuvers will also slow the spacecraft's speed just enough relative to Mercury to enable its thruster to place the probe into orbit around Mercury.

Upon arrival at Mercury in March of 2011 the spacecraft will enter an elliptical orbit that passes as close as 200 kilometers to Mercury's far northern surface every 12 hours. Such an orbit will allow MESSENGER to measure solar wind and magnetic fields at a variety of distances from the planet yet still obtain close-up measurements and images of the surface.

"The implementation of this complex mission plan has been a significant challenge," says McAdams, who also worked on the Near Earth Asteroid Rendezvous mission. "It's a privilege to join two other MESSENGER team engineers as recipients of this award," he adds, referring to Robin Vaughan and Adrian Hill, two other engineers from the team who received the award in 2004 and 2006, respectively.

McAdams, who holds an M.S. in Aeronautical and Astronautical Engineering from Purdue University, also created and led the development of MESSENGER education and outreach products, as well as trajectory data distribution to the science community. Last summer, he played a critical role in the creation of the Mercury Flyby Visualization Tool, which provides simulated views of Mercury from MESSENGER's perspective, during approach, flyby, and departure, or in real time (as the observations actually occur).

Members of MESSENGER's Geology Discipline Group used the tool both before and after the probe's first flyby of Mercury in January to gain information about imaging sites on Mercury. The tool will be updated for upcoming Mercury encounters.

"Jim McAdams has been a critical member of the MESSENGER team," offers MESSENGER Principal Investigator Sean Solomon. "Jim is usually several steps ahead of the rest of us with respect to planning for mission-critical events, and we can always count on his results to high precision. The journey to orbiting Mercury is long and complex, but we have a terrific guide."

Related Links
Mercury Flyby Visualization Tool
Space Tourism, Space Transport and Space Exploration News



Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News


Hobbyists track secret orbits of spy satellites
Ottawa (AFP) Feb 20, 2008
When the United States aims to shoot down one of its wayward top-secret spy satellites this week, a global group of 20 hobbyists keen to unearth heavenly mysteries will be watching.







  • Researchers To Upgrade Safety And Performance Of Rocket Fuel
  • NASA chief backs proposal for European spaceship
  • SpaceX And NASA To Improve Mission Critical Software Systems
  • A First For Falcon 9 As Five Go Hot

  • GLAST Blast Off Delayed Until At Least June 11
  • Independent Panel To Investigate Ariane 5 Software Glitch
  • NASA sets Thursday for GLAST launch
  • Two Ariane 5s Are Readied For Launches In May And June

  • Space shuttle blastoff damaged launch pad: NASA
  • Foam chunks in Discovery launch no problem: NASA official
  • Shuttle delivers Japanese lab to space station
  • Japan astronaut's fans celebrate shuttle launch

  • Space station's Japanese lab gets more room
  • Japan's Kibo lab takes shape at space station
  • Astronauts complete third spacewalk at space station
  • Astronauts begin Kibo mission's second spacewalk

  • MESSENGER Trajectory Mastermind Honored For Computation
  • AIAA President Urges House To Pass NASA Authorization Act HR 6063
  • House Committee Approves NASA Funding Bill
  • Canada Lagging Behind G8 In Space Capabilities

  • Suits For Shenzhou
  • China Launches New Space Tracking Ship To Serve Shenzhou VII
  • Three Rocketeers For Shenzhou
  • China's space development can pose military threat: Japan

  • Energy ministers get 'buddy' humanoids
  • TU Delft Robot Flame Walks Like A Human
  • A Biomimetic Jumping Microrobot
  • Robot conducts Detroit orchestra

  • Mars lander Phoenix struggles with soil sample
  • McCain would like to see a man on Mars
  • Phoenix Mars Lander Checking Soil Properties
  • Third Scoop Is A Keeper For Phoenix Mars Lander

  • The content herein, unless otherwise known to be public domain, are Copyright Space.TV Corporation. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal 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. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space.TV Corp on any Web page published or hosted by Space.TV Corp. Privacy Statement