A U.S. military satellite awaiting launch Friday night from Cape Canaveral is small enough to fit on a coffee table, but it will punch above its weight, scanning a region more than 20,000 miles above Earth to catalog spacecraft movements and space junk.

Loaded with three commercial satellites, a European Ariane 5 rocket returned to its launch pad in French Guiana Thursday after a two-week launch delay to resolve a technical issue that forced an abort to a countdown July 31. Arianespace says the mission has been rescheduled for launch Saturday due to unfavorable upper level winds in the forecast for Friday.

Follow the major events of the Atlas 5 rocket’s launch with the Solar Orbiter spacecraft with this mission timeline.