CAPE CANAVERAL, Fla. – As the miles melted between Atlantis and the International Space Station, the emotions grew — in orbit and on the ground.

At Mission Control on Sunday, lead flight director Kwatsi Alibaruho declared “this is it” as he gave the OK for the final docking in space shuttle history. Flashbacks to the shuttle’s first space station docking — with Russia’s Mir in 1995 — flooded his mind as he viewed the shuttle on the screens. He was a NASA trainee back then.

About 240 miles above the Pacific, the station’s naval bell chimed a salute — one of many landmarks, or rather spacemarks, of this final two-week shuttle mission that are being savored one by one.

“Atlantis arriving,” called out space station astronaut Ronald Garan Jr. “Welcome to the International Space Station for the last time.”

“And it’s great to be here,” replied shuttle commander Christopher Ferguson.

Cries of joy and laughter filled the connected vessels once the hatches swung open and the two crews — 10 space fliers altogether representing three countries — exchanged hugs, handshakes and kisses on the cheek. Cameras floated everywhere, recording every moment of the last-of-its-kind festivities.

Atlantis, carrying a year’s worth of supplies, is being retired after this flight, the last of the 30-year shuttle program.

“I won’t say that I got close to welling up in the eyes, but I will say that it was a powerful moment for me,” Alibaruho later told reporters.

He tried to keep his feelings discreet so as not to distract his team of flight controllers, but said, “I know they were all feeling very similar emotions, thinking about where we’ve come from, how much we’ve accomplished … what’s coming next.”

Alibaruho said the moment was also powerful for the 10 people in space for the docking: six Americans, three Russians and one Japanese.

“You could sense a palpable increase in emotion from all of the crew members, not just our U.S. astronauts,” he said. “They were extremely happy and really elated to see their visitors, and I know that they really recognize and appreciate the significance of these moments.”

A computer failure aboard Atlantis took away some of the redundancy desired for the rendezvous, but did not hamper the operation.

Within a few hours, though, news came that NASA was monitoring a piece of space junk that could come dangerously close to the orbiting shuttle-station complex Tuesday — right in the middle of a spacewalk.

Mission management team chairman LeRoy Cain stressed it was still too soon to know whether the unidentified object would truly pose a threat, and that a decision would be made today as to whether the linked spacecraft would have to move out of harm’s way. The size of the object was not immediately known.

This was the 46th docking by a space shuttle to a space station.

Nine of those were to Mir back in the 1990s, with Atlantis making the first.

The United States and Russia built on that sometimes precarious experience to create, along with a dozen other nations, the world’s largest spacecraft ever: the permanently inhabited, finally completed, 12 1/2 year-old International Space Station.