Two NASA astronauts and an Italian flight engineer took shelter in the space station’s Russian segment Wednesday as mission control analyzed a possible leak of toxic ammonia coolant aboard the complex. Initial data indicated it was likely a false alarm.

Rocket Lab launched a radar imaging satellite Tuesday for the Japanese company Synspective. The small Earth observation payload lifted off from New Zealand at 5:09 a.m. EST (1009 GMT) aboard an Electron rocket. Rocket Lab did not attempt to recover the Electron’s first stage on this mission.

A ULA Atlas 5 rocket is set to launch no earlier than 2 p.m. EDT (1800 UTC) on Friday, Oct. 6. It will sent up two prototype satellites for Amazon’s Project Kuiper satellite internet constellation.