Mars Odyssey spacecraft to reach 60,000th orbit milestone on June 23
NASA’s Mars Odyssey spacecraft, which began orbiting the red planet on October 23, 2001, will be orbiting the planet for the 60,000th time on June 23. Named after the bestselling novel “2001: A Space Odyssey” by Arthur C. Clarke, the spacecraft has to its name the title of longest-operating spacecraft ever sent to Mars.
Odyssey is currently serving as a key communications relay for NASA’s Mars rovers and making continued contributions to planetary science.
“This orbital milestone is an opportunity to celebrate Odyssey’s many achievements,” said Jim Green, NASA’s director of Planetary Science. “Odyssey will continue to help lay a foundation for the first humans to Mars in the 2030s through NASA’s Journey to Mars initiative.”
Within months of orbiting Mars, Odyssey started making major contributions to our knowledge about the planet. The spacecraft’s gamma-ray and neutron measurements indicated plentiful water ice just beneath the surface at high latitudes on Mars. The spacecraft’s unexpectedly long service has enabled achievements such as completion of the highest-resolution global map of Mars and observation of seasonal and year-to-year changes, such as freezing and thawing of carbon dioxide.
Through its many accomplishments, the spacecraft also has aided NASA’s preparations for human missions to Mars by monitoring radiation in the environment around the planet via the Mars Radiation Environment Experiment, developed at NASA’s Johnson Space Center in Houston.
Odyssey currently is completing an adjustment to an orbit that will position it to pass over Martian terrain lit by early-morning sunlight rather than afternoon light. In its current orbit, the spacecraft always flies near each pole and along what is called the terminator. The terminator is a “line” encircling Mars that passes through any point on the planet’s surface at sunrise and again at sunset, separating the portion of Mars lit by the Sun from the portion experiencing darkness, dividing day and night. The position of this line varies by time of day and time of year.
“Upcoming observations will focus on what is happening in the Martian atmosphere in the morning, such as clouds, hazes and fogs, and on frosts on the surface that burn off by later in the day,” said Jeffrey Plaut, Odyssey project scientist at JPL.
The planned drift to a morning-daylight orbit began in 2012, was accelerated in 2014, and will be completed with a maneuver in November to lock in the orbit timing so that each pass over the equator occurs at the same time of day.
“We have performed many orbit maneuvers over the long life of this mission, and we will use that experience conducting the one to halt the drift,” said Steve Sanders, Odyssey spacecraft engineer at Lockheed Martin Space Systems in Denver.
To date, Odyssey’s Thermal Emission Imaging System (THEMIS) has yielded 208,240 images in visible-light wavelengths and 188,760 in thermal infrared wavelengths. THEMIS images are the basis for detailed global maps and identification of some surface materials, such as chloride salt deposits and silica-rich terrain. The infrared imaging also indicates how quickly regions of the surface cool at night or warm in sunlight, telling researchers how dusty or rocky the ground is.
Odyssey’s three-instrument Gamma Ray Spectrometer (GRS) suite detected significant amount of hydrogen on the planet — interpreted as water ice hidden beneath the surface. This discovery prompted NASA to send its Phoenix Mars Lander to an arctic plain on Mars in 2008, where it examined the water ice detected by Odyssey. The spectrometer suite also mapped global distribution of key chemical elements, such as iron and potassium. The University of Arizona, Tucson, headed its development. Two GRS instruments are still active: the high-energy neutron detector from the Russian Space Research Institute and the neutron spectrometer from Los Alamos National Laboratories in New Mexico.
As a communications relay for NASA’s Mars rovers, Odyssey has transmitted to Earth more than 90 percent of the data received from the Opportunity rover. Future plans for Odyssey include relay duty for NASA and European Space Agency landers arriving on Mars in 2016.