Photos: News media images of Atlas 5 launch

This is the ascent timeline to be followed by the United Launch Alliance Atlas 5 rocket in launching the Mobile User Objective System satellite No. 4 on Wednesday at 5:59 a.m. EDT.

Firing through a veil of fog blanketing California’s Central Coast, a Falcon 9 launcher climbed into orbit Wednesday with 10 more satellites for Iridium’s voice and data relay constellation, pushing the upgraded network closer to completion as SpaceX accomplished another landing of the rocket’s first stage booster.

The Atlas 5 rocket that will send NASA’s Perseverance rover toward Mars next month aced a countdown rehearsal Monday at Cape Canaveral, helping ensure the United Launch Alliance-built rocket is ready for liftoff during the rover’s 23-day launch window.