The Crew Dragon capsule's docking with the space station was confirmed by operator Space X at 05:06 on Sunday morning Swedish time. About two hours later, the hatch was opened.
The Crew Dragon was launched just after midnight on Saturday, Swedish time. On board were the new crew of four astronauts, two from the USA, one from Japan, and one from Russia. They had to take their place on the ISS before the two Americans, Butch Wilmore and Suni Williams, could finally return home next week after more than nine months in orbit.
Wilmore and Williams went up to the ISS in June and were initially supposed to spend only about a week there. But Boeing's rocket system, which they traveled with, got such serious safety problems that it now has a flight ban for an indefinite period.
If everything goes as planned, Wilmore and Williams will fly home during the coming week with another of Space X's spacecraft that has been docked at the ISS since earlier.
Corrected: In an earlier version, there was an incorrect piece of information about which spacecraft the stranded astronauts would fly home with.
