NASA's InSight Mars lander performed its first engine burn on Tuesday (May 22), refining its course toward the Red Planet.
The 40-second burn, which involved four of InSight's eight thrusters, was designed to change the lander's velocity by about 8.5 mph (13.7 km/h). Mission team members will perform up to five additional burns before InSight's Nov. 26 touchdown, but none will be more substantial than Tuesday's, NASA officials said.
InSight didn't have Mars squarely in its sights when it lifted off atop a United Launch Alliance Atlas V rocket on May 5. That's perfectly normal; Mars spacecraft are scrubbed meticulously before liftoff to minimize the chances that they'll contaminate the Red Planet with Earth microbes, but the rockets they ride on remain "dirty." [NASA's InSight Mars Lander: Here's 10 Surprising Facts]
"As a result, Mars launches involve aiming the rocket just off-target so that it flies off into space," NASA officials explained in a statement announcing InSight's engine burn. "Separately, the spacecraft performs a series of trajectory correction maneuvers guiding it to the Red Planet. This makes sure that only the clean spacecraft lands on the planet, while the [rocket] upper stage does not come close."
The four thrusters not involved in Tuesday's maneuver have been getting a workout, too. They fire autonomously every day to keep InSight's antenna facing Earth and its solar panels facing the sun, NASA officials said.
InSight's navigation team tracks these background burns closely.
"Everyone has been working hard since launch to assess what these small forces have done to the trajectory," InSight navigation team chief Allen Halsell, of NASA's Jet Propulsion Laboratory in Pasadena, California, said in the same statement. "People have worked lots of hours to look at that. For engineers, it's a very interesting problem, and fun to try to figure out."
InSight's next course-correction maneuver is scheduled to occur July 28, according to the mission's launch press kit. Additional burn dates are Oct. 12, Nov. 11, Nov. 18 and Nov. 25. (These dates may not be set in stone, however; according to the press kit, the first burn was originally supposed to take place on May 15.)
InSight — whose name is short for "Interior Exploration using Seismic Investigations, Geodesy and Heat Transport" — is headed for a flat plain just north of the Martian equator, where it will make a parachute-aided touchdown on Nov. 26.
The lander will then spend about two Earth years monitoring "marsquakes" and subsurface heat flow, gathering data that should reveal a great deal about the Red Planet's interior structure. InSight's observations will help scientists better understand how Mars, and rocky planets in general, form and evolve, mission team members have said.
InSight shared a launch with a demonstration mission called Mars Cube One (MarCO), which consists of two identical, briefcase-size satellites. The MarCO craft have already traveled deeper into space than any other cubesat ever has.
If all goes according to plan, the duo will fly by Mars on Nov. 26 as InSight is performing its harrowing entry, descent and landing (EDL) sequence. The cubesats will attempt to beam InSight EDL telemetry back to Earth. (NASA's Mars Reconnaissance Orbiter will do this as well, so MarCO's contributions in this regard aren't critical to the InSight mission.)
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