James Webb Space Telescope moves to final orbit

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Saturday, January 29, 2022

An artistic rendering of the James Webb Space Telescope
Image: NASA.

On Monday, the James Webb Space Telescope entered its destination orbit around the L2 Lagrange point, about 1,500,000 kilometers (932,057 mi) from Earth, on the opposite side of Earth from the Sun.

A thruster maneuver closed the spacecraft's month-long journey that began in late December, following years of delays and several cost overruns. For its expected five- to ten-year service life, it is to study the most distant, and therefore the earliest galaxies formed after the Big Bang.

During its journey, dubbed "30 days of terror" by Sky & Telescope, the telescope successfully unfurled its 21-foot (6.4 meter) wide mirror, deployed its sunshield and cooled down to below 50 degrees Kelvin as it traveled to the L2 Lagrange point.

The launch of the telescope on the Ariane 5 launch vehicle.
Image: NASA/Bill Ingalls.

L2 is a secure location for spacecraft where the gravitational pull of the Sun and the Earth is balanced. Full scientific operations are slated to begin later this year and will involve 13 teams of scientists. The primary mission is to find the most distant and earliest galaxies formed after the Big Bang to help study the origins of the Universe. The nominal mission time is five years, with a goal of ten. The location of its orbit is very different to its predecessor, the Hubble Space Telescope, which orbits much closer to Earth. James Webb's instruments will face away from the Sun, giving a greater clarity to the images it will obtain compared to Hubble.

An Ariane 5 launch vehicle carried the telescope up on December 25 from the Guiana Space Centre in French Guiana, after arriving in October. The launch date was delayed by a week due to unfavorable weather.

The United States National Aeronautics and Space Administration (NASA) began project development in 1996, planning for a launch in 2007 at a cost of USD550 million. After NASA contracted Northrop Grumman to build the telescope, mission managers estimated a 2010 launch would cost between one and 3.5 billion USD. Redesigns to reduce technical requirements pushed launch plans to 2013 for an estimated cost of USD4.5 billion. The US Congress ordered a project review in 2010 which delayed the launch again to 2015.

For an estimated cost of USD6.5 billion, the United States House Appropriations Subcommittee on Commerce, Justice, Science, and Related Agencies proposed canceling the telescope altogether in 2011. After a plan was made for a 2018 launch at a cost of USD8.8 billion, technical errors found in the telescope and the COVID-19 pandemic pushed the launch date to 2021.


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