Photos: Tuesday’s Atlas 5 rollout

A massive U.S. Navy satellite to launch from Cape Canaveral in January has arrived in Florida, kicking off a campaign to ready the mobile communications craft for flight.

NASA officials said Tuesday the weekend test-firing of the Space Launch System moon rocket’s core stage was cut short by an out-of-limits parameter in a hydraulic system for gimbaling, or vectoring, one of its engines. NASA Administrator Jim Bridenstine told Spaceflight Now engineers are “feeling pretty good” about the data gathered during the shortened test-firing, and managers may decide to ship the SLS core stage to the Kennedy Space Center for launch preparations without re-attempting the planned eight-minute hot fire.

Intelsat and SES, operators of the two largest fleets of geostationary communications satellites, have ordered 10 spacecraft from Maxar, Northrop Grumman and Boeing for launches beginning in 2022 to replace C-band capacity being transitioned to 5G cellular network services.