How a single shuttle mission performed the first-ever on-orbit repairs
In short: In May 2009, the space shuttle Atlantis docked with the Hubble Space Telescope for a high-stakes mission. Beyond simple upgrades, the crew performed unprecedented repairs to broken instruments, fundamentally altering the telescope's scientific future through five intense spacewalks.
The STS-125 mission, known as Servicing Mission 4, was a 12-day intensive operation designed to refurbish and renew the Hubble Space Telescope. Launched on May 11, 2009, the mission utilized the shuttle's robotic arm to grapple the telescope at 1:14 p.m. EDT. Once docked, the telescope was secured to the Flight Support System, a specialized rotating device often referred to as a 'lazy Susan,' which allowed the crew to access various components during the servicing period.
What set this mission apart from previous servicing efforts was the complexity of the repairs. For the first time in Hubble's history, astronauts performed on-orbit repairs to bring failed instruments back to life. In particular, engineers repaired the Advanced Camera for Surveys (ACS) and the Space Telescope Imaging Spectrograph (STIS) to make them operational again. This was complemented by the installation of two brand-new scientific instruments: the Cosmic Origins Spectrograph (COS) and the Wide Field Camera 3 (WFC3).
The mission's scope extended far beyond instrumentation. To ensure the telescope's longevity, the crew installed new batteries, gyroscopes, and a new science computer. They also refurbished a fine guidance sensor and applied new insulation to three electronics bays. After nearly a week of being linked together, the spacecraft began their relative separation on May 19, 2009, having completed five critical spacewalks that brought Hubble to the apex of its scientific capabilities.
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Sources
- Summary by Intellect · source: NASA | Hubble and STS-125 Grapple
- Also: The Final Mission to Hubble - NASA Science
- Also: NASA Scientific Visualization Studio | Hubble Archive - Servicing Mission 4, STS-125
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