"Today, at 2:00 p.m. EST, Webb fired its onboard thrusters for nearly five minutes (297 seconds) to complete the final post-launch course correction to Webb’s trajectory," NASA said in a blog report.
"This mid-course correction burn inserted Webb toward its final orbit around the second Sun-Earth Lagrange point, or L2, nearly 1 million miles away from the Earth."
The final mid-course burn added only about 3.6 miles per hour (1.6 meters per second) to Webb’s speed, which was all that was needed to send it to its preferred “halo” orbit around the L2 point, NASA said.
"Webb has used as little propellant as possible for course corrections while it travels out to the realm of L2, to leave as much remaining propellant as possible for Webb’s ordinary operations over its lifetime: station-keeping (small adjustments to keep Webb in its desired orbit) and momentum unloading (to counteract the effects of solar radiation pressure on the sunshield)," NASA added.
Lagrange points are positions in space where objects sent there tend to stay put. At such points, the gravitational pull of two large masses precisely equals the centripetal force required for a small object to move with them. These points in space can be used by spacecraft to reduce fuel consumption needed to remain in position, according to NASA.