Artist's depiction of MAVEN in orbit around Mars. (Credit: NASA Goddard Space Flight Center)
NASA鈥檚 4-year-old atmosphere-sniffing (MAVEN) mission is embarking on a new campaign today to tighten its orbit around Mars. The operation will reduce the highest point of the MAVEN spacecraft鈥檚 elliptical orbit from 3,850 to 2,800 miles (6,200 to 4,500 kilometers) above the surface and prepare it to take on additional responsibility as a data-relay satellite for NASA鈥檚 , which launches next year.
鈥淭he MAVEN spacecraft has done a phenomenal job teaching us how Mars lost its atmosphere and providing other important scientific insights on the evolution of the Martian climate,鈥� said Jim Watzin, director of NASA's Mars Exploration Program. 鈥淣ow we鈥檙e recruiting it to help NASA communicate with our forthcoming Mars rover and its successors.鈥�
While MAVEN鈥檚 new orbit will not be drastically shorter than its present orbit, even this small change will significantly improve its communications capabilities. 鈥淚t鈥檚 like using your cell phone,鈥� said Bruce Jakosky, MAVEN principal investigator and associate director of 蜜桃传媒破解版下载's 听(LASP). 鈥淭he closer you are to a cell tower, the stronger your signal.鈥�
A strong telecommunications antenna signal is not the only benefit of a tighter orbit. Coming in nearly 1,000 miles (about 1,500 kilometers) closer also will allow the MAVEN orbiter to circle Mars more frequently鈥�6.8 orbits per Earth day versus 5.3 previously鈥攁nd thus communicate with the Mars rovers more frequently. While not conducting relay communications, MAVEN will continue to study the structure and composition of the upper atmosphere of Mars. 鈥淲e鈥檙e planning a vigorous science mission far into the future,鈥� said Jakosky, also a professor in the Department of Geological Sciences.
Under its current orbit (left), MAVEN circles the Red Planet once every 4.5 hours. The spacecraft will soon begin a series of maneuvers (middle) to shrink that period down to once every 3.5 hours (right). Credit: NASA Goddard Space Flight Center
Feeling the drag
The MAVEN mission was designed to last two years in space, but the spacecraft is still operating normally. With the mission managing its fuel to last through 2030, NASA plans to use MAVEN's relay capability as long as possible. The MAVEN orbiter carries an ultra high-frequency radio transceiver鈥攕imilar to transceivers carried on other Mars orbiters鈥攖hat allows it to relay data between Earth and rovers or landers on Mars. The MAVEN spacecraft already has served occasionally as NASA鈥檚 communication liaison with the Curiosity Rover.听
Over the next few months, MAVEN engineers will use a navigation technique known as aerobraking鈥攍ike applying the brakes on a car鈥攖o take advantage of the drag of the Red Planet鈥檚 upper atmosphere to slow the spacecraft down gradually, orbit by orbit. This is the same drag you would feel if you put your hand out of the window of a moving car.听
Based on the tracking of the spacecraft by the navigation team at NASA鈥檚 Jet Propulsion Laboratory in Pasadena, California, and at Lockheed Martin in Littleton, Colorado, engineers will begin carefully lowering the lowest part of the spacecraft鈥檚 orbit into the Martian upper atmosphere over the next couple of days by firing its thrusters. The spacecraft will circle Mars at this lower altitude about 360 times over the next 2.5 months, slowing down slightly with each pass through the atmosphere. While it may seem like a time-consuming process, aerobraking is the most efficient way to change the spacecraft鈥檚 trajectory, said Jakosky: 鈥淭he effect is the same as if we fired our thrusters a little bit on every orbit, but this way, we use very little fuel.鈥澨�
Fortunately, the team has ample experience operating the spacecraft at these lower altitudes. On nine previous occasions throughout the mission, MAVEN engineers have dipped the orbiter into the same altitude targets for aerobraking to take measurements of the Martian atmosphere. As a result of these 鈥渄eep dips鈥� and other measurements, NASA has learned that solar wind and radiation had stripped Mars of most of its atmosphere, changing the planet鈥檚 early climate from warm and wet to the dry environment we see today. MAVEN also discovered two new types of auroras on Mars and the presence of charged metal atoms in its upper atmosphere that tell us that a lot of debris is hitting Mars that may affect its climate.听
LASP provided two science instruments and leads science operations, as well as education and public outreach, MAVEN. NASA鈥檚 Goddard Space Flight Center in Greenbelt, Maryland, manages the MAVEN project and provided two science instruments for the mission. Lockheed Martin built the spacecraft and is responsible for mission operations. The University of California, Berkeley鈥檚 Space Sciences Laboratory also provided four science instruments for the mission. NASA鈥檚 Jet Propulsion Laboratory in Pasadena, California, provides navigation and Deep Space Network support, as well as the Electra telecommunications relay hardware and operations.
