Live coverage: Atlas 5 countdown and launch journal

After months of delays caused by the coronavirus pandemic, Arianespace scrubbed back-to-back Vega launch attempts Saturday and Sunday due to unfavorable high-altitude winds over the European-run Guiana Space Center in South America. The Vega rocket is awaiting launch on a rideshare mission carrying 53 small satellites into orbit for 21 customers in 13 countries.

United Launch Alliance’s first Vulcan rocket was filled with methane and liquid oxygen propellants at Cape Canaveral last week for a tanking test, but managers decided to move the rocket back inside a hangar for a few adjustments before proceeding with an engine test-firing.

Technicians around Cape Canaveral spent the last four weeks assembling a United Launch Alliance Atlas 5 rocket and preparing a Lockheed Martin-built NOAA weather satellite for liftoff March 1.