STS-122 (Atlantis / Columbus)

Background

By the mid-2000s, the International Space Station had grown incrementally through a succession of American and Russian segments, yet its scientific potential remained constrained. The European Space Agency had spent more than a decade designing and building Columbus, a pressurised cylindrical laboratory intended to serve as its principal research outpost in low Earth orbit. Measuring roughly 6.9 metres in length and 4.5 metres in diameter, the module was engineered to host experiments in fluid physics, materials science, biology, and Earth observation, with external platforms capable of accommodating instruments exposed directly to the space environment. Columbus represented not only a technical achievement but a political statement: that Europe had earned a permanent, sovereign place aboard humanity's shared orbital home.

STS-122 was the mission assigned to deliver that commitment. Flying aboard Space Shuttle Atlantis, the crew of seven carried Columbus in the payload bay across the roughly 400-kilometre altitude of the station's orbit. The flight came after a frustrating series of delays in late 2007, most notably caused by faulty fuel-cell hydrogen sensors that grounded Atlantis during what had been planned as a December launch attempt. Those scrubs underscored the exacting standards of shuttle-era safety culture and ultimately gave ground teams additional time to verify all systems before committing to flight.

Crew and Their Roles

Commander Stephen Frick led the mission with pilot Alan Poindexter at his side, the two responsible for guiding Atlantis from launch through rendezvous and back to the runway. Mission specialists Rex Walheim, Hans Schlegel, Stanley Love, and Leland Melvin formed the core of the extravehicular and robotic operations team. Léopold Eyharts, a French astronaut representing ESA and CNES, flew up as an ISS expedition crew member, remaining aboard the station after Atlantis departed to begin the first long-duration scientific occupation of Columbus.

Schlegel and Walheim were the primary spacewalkers, though Schlegel's first excursion was delayed by a day after he fell ill shortly after arrival at the station, requiring Love to step in as his substitute on the first EVA. Schlegel recovered and participated in the subsequent spacewalk, helping to connect power, data, and fluid lines to the newly installed module. The flexibility the crew demonstrated in adapting to that medical contingency illustrated the kind of in-flight problem-solving that characterised shuttle operations at their most professional.

The Flight

Atlantis lifted off on 7 February 2008 and reached orbit approximately eight and a half minutes later, placing the shuttle and its precious cargo on the trajectory required to chase down the station. Following standard rendezvous procedures over roughly two days, Atlantis closed on the ISS and docked, after which the crew began the methodical process of integrating Columbus into the station's expanding architecture.

At approximately 55 hours and 33 minutes into the mission, the robotic arm sequences and spacewalker support work culminated in Columbus being berthed to the station's Harmony node. The installation was a landmark moment: for the first time, European astronauts and scientists would have a dedicated national laboratory permanently attached to the ISS, equipped with multiple experiment racks ready for activation. Over the following days, the crew connected utilities, transferred hardware, and conducted the initial checks needed to bring Columbus to operational status. Three spacewalks in total were completed during the docked phase, accumulating substantial hours of extravehicular activity to finish the outfitting work.

Eyharts formally transferred to the station crew during this period, exchanging his role as a shuttle mission specialist for that of an ISS flight engineer who would oversee Columbus's early science programme. His handover to the station was a seamless element of a carefully choreographed schedule that also included the return of outgoing ISS crew member Daniel Tani aboard Atlantis.

Undocking, Re-entry, and Landing

With Columbus installed and its initial systems checked out, Atlantis undocked from the station at roughly 250 hours into the mission elapsed time. The crew then spent additional days in free flight before the deorbit burn was performed at approximately T+305 hours and 41 minutes, committing the shuttle irreversibly to its return through the atmosphere. Atlantis touched down at Kennedy Space Center at approximately T+306 hours and 22 minutes, completing a mission of just over twelve and a half days.

The landing at KSC allowed ground teams immediate access to the orbiter and its returning crew members, including Tani, who had spent several months aboard the station and required the standard post-flight medical assessment. The shuttle rolled out under Florida skies as designed, closing a mission that had executed virtually every objective on its ambitious manifest.

Legacy

The delivery of Columbus transformed the ISS from a station with limited European participation into one with a genuine ESA research cornerstone. In the years following STS-122, Columbus hosted hundreds of experiments across life sciences, physical sciences, and technology demonstrations, with results published in peer-reviewed literature worldwide. The module's external payload facility proved particularly valuable for materials exposure studies and Earth remote sensing, extending the laboratory's scientific reach beyond its pressurised interior.

For ESA, Columbus validated decades of investment and established the agency's credibility as a full partner in human spaceflight operations, paving the way for European contributions to subsequent programmes. For NASA and the shuttle programme, STS-122 demonstrated the continued centrality of the orbiter fleet to station assembly even in the programme's twilight years, when every remaining flight carried outsized strategic significance.

Léopold Eyharts's tenure aboard Columbus in its inaugural weeks gave the module an immediate human presence and helped establish the operational rhythms that European flight controllers at the Columbus Control Centre in Oberpfaffenhofen, Germany, would maintain for years to come. STS-122 thus stands as one of the defining assembly missions of the ISS era, binding Europe to the station in a lasting and scientifically productive way.