Live coverage: Two satellites lift off aboard Ariane 5

An Ariane 5 launcher uniquely modified to loft four of Europe’s Galileo navigation satellites on one flight has received its payload for liftoff next week in French Guiana.

A European environmental satellite launched Tuesday from Russia’s Plesetsk Cosmodrome to begin a mission of at least seven years measuring the height, color and temperature of the world’s oceans. The Sentinel 3A spacecraft lifted off aboard a Rockot booster at 1757 GMT (12:57 p.m. EST).

The launch will be managed by Arianespace and will carry the third satellite for the Optical Space Component (CSO– Composante Spatiale Optique) program. Liftoff is scheduled for Thursday, March 6, at 1:24 p.m. Kourou time (11:24 a.m. EST, 1624 UTC).