One of the hundreds of thousands of pieces of space-age litter orbiting Earth zipped uncomfortably close to the International Space Station on Tuesday.

The six crew members of the space station took refuge in their “lifeboats” — two Soyuz space capsules they would use to escape a crippled station — as the unidentified object hurtled past them at a speed of 29,000 miles per hour, missing the space station by only 1,100 feet. The episode took place at 8:08 a.m. Eastern time.

“We believe the probability that it would the hit the station was about 1 in 360,” said Lark Howorth, who leads the team at NASA that tracks the space station’s trajectory. NASA rules call for precautions when the risk of impact is greater than 1 in 10,000.

In the section of the station run by the United States, astronauts closed the hatches in case the debris — commonly known as space junk — crashed through, to limit the danger of explosive decompression. To prepare for a rapid departure, the clamps holding the Soyuz capsules to the station were released.