Join Donate

Jason DavisMay 25, 2012

Dragon makes history, berths with International Space Station

“Houston, Station; looks like we got us a Dragon by the tail.”

With those words, NASA astronaut Don Pettit confirmed that SpaceX’s Dragon capsule had made spaceflight history by becoming the first commercial vehicle to arrive at the International Space Station. The Dragon was captured by the robotic Canadarm2 at 9:56AM EDT (13:56 UTC) as the ISS passed over Northwest Australia. Berthing with the station was completed approximately two hours later at 12:02PM EDT (16:02 UTC).

Dragon grappled by ISS


Dragon grappled by ISS
In this screen grab from NASA TV, the Dragon spacecraft is seen shortly after the moment of capture by the International Space Station's Canadarm2, marking a milestone in both the COTS 2 flight and commercial space history.

This video from NASA shows the moment of capture:

The Dragon began its final approach to the station early Friday morning, completing most of its demonstration maneuvers without an issue. A minor glitch occurred as the Dragon made its first attempt to proceed to the 30-meter hold point, when the craft’s LIDAR picked up stray reflections from the Japanese Experiment Module. SpaceX commanded the Dragon to retreat to 70 meters, narrowed the LIDAR’s field of view to exclude the erroneous signals, and commanded the spacecraft to close again.

Capture occurred while the station was in darkness. NASA originally indicated the astronauts aboard the station would wait for daylight, but after additional exterior lights were activated, the decision was made to proceed.

After the Dragon was grappled, NASA and SpaceX took the opportunity for a shift change before the spacecraft was slowly guided to the nadir (Earth-facing) port on the station’s Harmony module. The two-stage berthing process, which includes the installation of sixteen bolts to ensure a tight seal between the vehicles, was completed as the ISS passed over the United States’ Pacific Northwest.

Dragon berthed to ISS


Dragon berthed to ISS
The Dragon capsule completes its two-step berthing procedure, officially becoming the first commercial spacecraft to visit the ISS on Friday, May 25, 2012.

The commercial spaceflight milestone also marks the first time an American vehicle has visited the ISS since July 2011, when Atlantis flew the space shuttle program’s final mission. The Dragon’s hatch will be opened tomorrow morning at approximately 7:40AM EDT (11:40 UTC). NASA TV coverage of the event will begin at 5:30AM EDT (9:30 UTC). In yesterday’s press conference, SpaceX mission director John Couluris said a camera installed in the Dragon capsule would provide imagery of the event from the Dragon’s perspective.

I will continue to post periodic updates on my blog, and via my Twitter account, as the mission progresses.

Read more: commercial spaceflight, Orion, mission status, International Space Station

You are here:
Jason Davis thumbnail
Jason Davis

Digital Editor for The Planetary Society
Read more articles by Jason Davis

Comments & Sharing
Bill Nye and people
Let's Change the World

Become a member of The Planetary Society and together we will create the future of space exploration.

Join Today

LightSail 2

LightSail 2 launched aboard the SpaceX Falcon Heavy. Be part of this epic point in space exploration history!


"We're changing the world. Are you in?"
- CEO Bill Nye

I'm In!