Russia's Progress M-15M resupply freighter failed to re-dock with the International Space Station (ISS) due to certain emergency situations in the station's new Kurs-NA rendezvous system, Russia's Mission Control Center (MCC) said Tuesday.
The unmanned Progress M-15M, which arrived at the ISS in April, undocked from the station early Monday to conduct a series tests of the upgraded Kurs-NA rendezvous system, Xinhua reported.
According a spokesman of the MCC, the Kurs-NA system warned of a possible emergency situation and called off the re-docking when the Progress M-15M was approaching at a distance of 15 km to the ISS.
The MCC didn't provide more details about the operation, only confirming that the Progress M-15M was now at a safe distance to the ISS.
"We are considering to carry out the re-docking again on July 28, after Japan's cargo spacecraft HTV's docking with the ISS," the spokesman said.
The cause of the failed re-docking has been investigated, he added.