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The James Webb Space Telescope (JWST) is a large aperture, infrared telescope planned for launch in 2018. JWST is a
facility observatory that will address a broad range of science goals covering four major themes: First light and Re-
Ionization, the Assembly of Galaxies, the Birth of Stars and Protoplanetary Systems, and Planetary Systems and the Origins
of Life. JWST embodies several major technical challenges. With a 6.5 meter diameter mirror it will be the largest space
telescope ever flown. It is the first cryogenic telescope to incorporate passive cooling, achieved by means of a large
sunshade, to reach its ~40 K operating temperature. Due to the size of the Observatory, it must be stowed for launch, and
then deployed to its operational configuration on its way to an orbit around the second Lagrange point. JWST is well on
its way from drawing board to sky. Much of the flight hardware is already built and tested at the sub-system level. In this
talk we will focus on the remaining tasks on the road to JWST’s first science observations on the sky. Prior to the launch,
the remaining work to integrate the observatory elements centers around four major activities:
• Cryo-optical testing of the instrument complement
• Cryo-optical testing of the assembled telescope and instrument complement;
• Integration of the observatory
• Full-scale testing of the observatory deployments.
We will discuss the design and philosophy underlying the cryo-optical test program for the Observatory. Cryo-optical
testing begins with the instrument complement at the Goddard Space Flight Center, and finishes with an end-to-end test of
the assembled telescope in the world’s largest cryogenic vacuum chamber at the Johnson Space Flight Center. In the
context of a detailed overview of JWST’s deployment steps after launch, we will describe the final stages of Observatory
integration and the testing to verify these deployments, ready for launch. Finally, we will discuss the post-launch timeline
to transition the stowed Observatory to the start of science operations.
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