Webb fired its onboard thrusters for nearly five minutes (297 seconds) to complete the final postlaunch course correction to Webbâs trajectory. 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) â a mere walking pace â to Webbâs speed, which was all that was needed to send it to its preferred âhaloâ orbit around the L2 point.
âWebb, welcome home!â said NASA Administrator Bill Nelson. âCongratulations to the team for all of their hard work ensuring Webbâs safe arrival at L2 today. Weâre one step closer to uncovering the mysteries of the universe. And I canât wait to see Webbâs first new views of the universe this summer!â
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 Webbâs 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 huge sunshield).
âDuring the past month, JWST has achieved amazing success and is a tribute to all the folks who spent many years and even decades to ensure mission success,â said Bill Ochs, Webb project manager at NASAâs Goddard Space Flight Center. âWe are now on the verge of aligning the mirrors, instrument activation and commissioning, and the start of wondrous and astonishing discoveries.â
Now that Webbâs primary mirror segments and secondary mirror have been deployed from their launch positions, engineers will begin the sophisticated three-month process of aligning the telescopeâs optics to nearly nanometer precision.
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