China's Shenzhou 9 space capsule — which launched Saturday (June 16) carrying three astronauts, including the country's first female spaceflyer — is expected to link up with the unmanned Tiangong 1 space lab around 3 p.m. Monday Beijing time (3 a.m. EDT; 0700 GMT), according to Chinese media reports.
To date, the only two countries to pull off a manned orbital docking are the United States and the Soviet Union/Russia, which first did so in 1966 and 1969, respectively.
Shenzhou 9 will dock with Tiangong 1 twice, with the first hookup being automated. At some point, the two spacecraft will separate, and the three taikonauts, as China's astronauts are known, will perform the second docking manually.
Forty-six-year-old Jing Haipeng leads the taikonaut crew, which also includes Liu Wang, 42, and 33-year-old Liu Yang, China's first female astronaut. All are members of the Communist Party of China and former pilots with the People's Liberation Army; Jing flew on China's last manned spaceflight, which took place in 2008.
Two of the taikonauts will live aboard Tiangong 1 during the 13-day mission, while one will stay aboard Shenzhou 9 at all times in case of emergency, Chinese officials have said.
Shenzhou-9's flight is considered a key step in China's plan to build a permanently staffed space station in Earth orbit. The nation hopes to have a 60-ton station and up and running by 2020. (For comparison, the International Space Station weighs about 430 tons.)
While Shenzhou 9's flight is China's first attempt at a crewed space docking, the nation has successfully linked up two robotic spacecraft in orbit. In November, the unmanned Shenzhou 8 craft docked twice with Tiangong 1 before returning safely to Earth.