KENNEDY SPACE CENTER, Fla.--With commander Mark Kelly at the controls, the shuttle Endeavour caught up with the International Space Station early today, looping under and then ahead of the lab complex before gliding back to a "silky smooth" docking at the station's forward port at 6:14 a.m. EDT.

"Houston and station, capture's confirmed," pilot Gregory Johnson radioed as the two spacecraft sailed through orbital darkness 220 miles above the south Pacific Ocean.

Inside the space station, European Space Agency astronaut Paolo Nespoli rang the ship's bell in a traditional naval welcome, announcing "Endeavour, arriving."

Astronauts aboard the International Space Station photograph the shuttle Endeavour&39's heat shield tiles during a dramatic back-flip maneuver shortly before docking today.

As usual with shuttle-station linkups, it took most of an orbit to lock the two spacecraft together and complete leak checks before hatches were opened around 7:38 a.m.

Kelly, Johnson, Andrew Feustel, Michael Fincke, Gregory Chamitoff, and European Space Agency astronaut Roberto Vittori floated into the station's Harmony module at 8:10 a.m., welcomed aboard by Expedition 27 commander Dmitry Kondratyev and his five crewmates: Andrey Borisenko, Alexander Samokutyaev, Ronald Garan, Catherine Coleman, and Nespoli.

"It's good to be back," said Kelly, who last visited the station in June 2008.

Live television from inside the Harmony module showed the two crews hugging and shaking hands amid smiles and laughter. A few minutes later, they split up for a required safety briefing to familiarize the shuttle fliers with emergency procedures aboard the station.

Endeavour docked at the space station&39's forward port at 6:14 a.m. EDT after a flawless rendezvous by commander Mark Kelly.

"The entire rendezvous, approach, RPM (rendezvous pitch maneuver), and final docking was really silky-smooth today, we had no anomalies to work, no problems whatsoever, everything went really, really well," said shuttle flight director Gary Horlacher.

Kelly's wife, Rep. Gabrielle Giffords (D-Ariz.), who was shot in the head in an assassination attempt in January, was expected to undergo surgery today in Houston to replace a section of her skull that was removed earlier. Giffords flew to Florida last weekend to watch Endeavour's launch Monday and her recovery has been the focus of intense media interest.

Horlacher said he did not know any details about Giffords' medical treatment, but he said it had not affected Kelly's performance in orbit.

"If you didn't know any of that was going on, you wouldn't have any idea that those kind of things are going on in his personal life," Horlacher said. "He's doing great. As far as that actual medical activity, I don't have any details on that. I know the surgeons are keeping him informed appropriately."

The combined crews got busy after docking, transferring spacesuits and other equipment from Endeavour to the station that will be used during four spacewalks later in the mission.

While that was going on, the shuttle's robot arm, operated by Fincke and Vittori, pulled a massive spare parts pallet from Endeavour's cargo bay at 9:27 a.m. and handed it off to the station arm, operated by Johnson and Chamitoff inside the multi-window cupola compartment. Chamitoff and Johnson then moved External Logistics Carrier No. 3 to the left side of the station's power truss and locked it in place just after noon.

The Endeavour astronauts float into the International Space Station about two hours after docking. Shuttle commander Mark Kelly, center, shakes hands with station astronaut Ronald Garan.

The components mounted on ELC-3 are welcome additions to the station's extensive spare parts inventory for use down the road, after the shuttle fleet is retired. Three other ELCs were attached to the station during two earlier shuttle missions, two on the right side of the power truss and one on the lower left.

ELC-3 is carrying 10 spare remote power control module circuit breakers, two spare S-band antenna assemblies, an ammonia tank loaded with 600 pounds of coolant, a high-pressure oxygen tank for the station's airlock, and a spare arm for a Canadian cargo manipulator that can be attached to the station's main robot arm. It is also carrying a suite of small military experiments.

With ELC-3 locked in place on the space station, the astronauts are clear to move the shuttle's other primary payload, the $2 billion Alpha Magnetic Spectrometer cosmic ray detector, to its mounting point on the right side of the power truss on Thursday.

Throughout the final stages of today's rendezvous, Feustel monitored navigation sensors and software designed for NASA's post-shuttle Orion exploration capsule to help engineers calibrate the system and characterize its performance. After undocking May 29, the new system, known by the acronym STORRM, will be put to the test during a re-rendezvous exercise to verify its performance in real-world conditions.

"They had a really good day," Horlacher said. "They had all their systems up, collected data all the way in to the final docking...The STORRM folks will be pulling data down for the next few days from their avionics box and be all set up for the undock several days down the road."

Amid a busy first few days of docked activity, three of the station's crew members--Coleman, Nespoli, and Kondratyev--will be gearing up to undock and return to Earth on Monday aboard the Soyuz TMA-20 ferry craft. Because the departing crew members need to adjust their sleep cycle to synch up with the landing day timeline--and because of a two-week launch delay for the Endeavour astronauts--the two crews are working in staggered shifts.

Garan, assisting the shuttle crew during the early portion of the docked flight, will go to bed at 2:26 p.m., followed a half hour later by Kelly and his crewmates. The station crew plans to go to bed at 5:31 p.m. After the Soyuz TMA-20 departure, the remaining station crew members will adjust their sleep cycles to synch up with the shuttle crew.

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