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A piece of space junk zipped by SpaceX's Dragon capsule on its way to the space station

The astronauts of SpaceX's Crew-2 mission for NASA had a brief moment of suspense after their spectacular launch on Friday (April 23) when a piece of space debris passed unexpectedly close by their Crew Dragon capsule. 

The space junk encounter, called a conjunction, occurred at 1:43 p.m. EDT (1743 GMT) as the four Crew-2 astronauts were preparing to sleep after a long day. Their Crew Dragon Endeavour docked at the space station early Saturday.

"For awareness, we have identified a late breaking possible conjunction with a fairly close miss distance to Dragon," SpaceX's Sarah Gilles told the astronauts about 20 minutes before the conjunction on Friday. "As such, we do need you to immediately proceed with suit donning and securing yourselves in seats."

Gilles told the astronauts to get back into their spacesuits and seats as safety precaution in case of an impact. You can watch the exchange here, courtesy of Raw Science. 

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"Copy Sarah, you want us in the suit for a possible close call,"Crew-2 astronaut Thomas Pesquet of the European Space Agency radioed back.

As the time of the space debris conjunction approached, Gilles radioed an update to the Crew-2 astronauts to say the debris appeared to be passing Crew Dragon at a farther distance than initially expected. By 1:44 p.m. EDT, Gilles radioed the all-clear to say that the debris had passed by without incident. 

"Dragon, SpaceX, we have passed TCA with no impact," Gilles said of the debris. The distance and composition of the debris was not immediately clear.

After the conjunction, the Crew-2 astronauts — Shane Kimbrough and Megan McArthur of NASA, Pesquet of the European Space Agency and Akihiko Hoshide of Japan — got out of their suits and continued with their evening. They arrived at the station on Saturday without any more surprises.

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SpaceX's Crew-2 Crew Dragon Endeavour arrives at the International Space Station with four astronauts aboard in a smooth docking on April 24, 2021 one day after launching into orbit.  (Image credit: NASA TV)

Such close encounters with space junk have occurred several times over the years, with the International Space Station and some NASA shuttles occasionally moving to dodge debris as a safety measure. The space station is huge, about the size of a football field, but SpaceX's Crew Dragon — a space capsule — is relatively small at just under 27 feet long (8 meters).

Last September, a potential space debris threat forced the space station's then-three-person crew to take shelter inside the station's Russian segment to be closer to their Soyuz spacecraft in case of an impact. 

Space debris is a growing concern for astronauts and satellites as companies launch more and more missions into space, including megaconstellations like SpaceX's Starlink satellite internet project, which now numbers more than 1,400 satellites.

This week, the European Space Agency held the 8th European Conference on Space Debris to discuss the problem of space junk. There is an estimated 128 million objects larger than a millimeter in orbit today, according to an ESA overview.

Email Tariq Malik at tmalik@space.com or follow him @tariqjmalik. Follow us @Spacedotcom, Facebook and Instagram.