SpaceX is still working toward a test fire of a Falcon 9 rocket at Cape Canaveral today, a spokesperson has confirmed to Inverse. He couldn’t give a precise time — the nature of testing is uncertainty, he said.

The test fire of the rocket’s engines had originally been scheduled for yesterday.

The launch, expected approximately three days after a successful test fire, will carry 11 satellites that belong to communications company ORBCOMM into orbit.

It will be SpaceX’s first launch since June 28, when a Falcon 9 that was loaded with a Dragon capsule with cargo for the International Space Station blew apart two minutes after liftoff. That incident was the first failure in SpaceX’s 19 missions to date.