Atlas V Rocket Launch Tonight: Live Stream Link, Time & Viewing Tips for ULA’s Historic Amazon Leo Mission

Cape Canaveral, Fla. — United Launch Alliance’s Atlas V rocket lit up the pre-dawn sky today, roaring off Space Launch Complex 41 at 12:30 a.m. EDT (04:30 UTC) on its eighth mission for Amazon’s rapidly growing Leo broadband constellation. The 551-configuration booster — sporting a five-meter fairing, five strap-on solid rocket boosters and a single-engine Centaur upper stage — carried 29 satellites to low-Earth orbit. With their successful separation confirmed just over an hour after liftoff, Amazon now has 396 spacecraft aloft as it races toward limited commercial service later this year. Why this Atlas V launch matters • Final flight of the Atlas V in its powerful 551 variant, closing a 20-year chapter that began with NASA’s New Horizons probe to Pluto in 2006. • Marks 110 successful Atlas V missions, maintaining the vehicle’s 100 % reliability record. • Leaves just six Atlas V flights on ULA’s manifest, all reserved for Boeing’s Starliner crew capsule. Launch window and viewing footprint Liftoff occurred at the opening of a 29-minute window that began at 12:24 a.m., under 85 % “go” weather odds from the 45th Weather Squadron. The nighttime ascent on a northeast trajectory treated skywatchers from Florida to New England to a bright, comet-like streak, with visibility extending west toward Alabama and Tennessee. Mission timeline highlights (all times EDT) • T-0: 12:30:15 — Liftoff • +2:20 — SRB jettison • +4:33 — Booster stage separation • +4:43 — Centaur main engine start • +18:40 — Centaur shutdown, coast phase • +56:10 — Centaur restart • +1:02:00 — Payload deployment complete What’s next for ULA and Amazon Leo ULA will shift Amazon launches to the new Vulcan rocket later this year, part of a 38-flight contract aimed at rapidly deploying thousands of Ku-band satellites for global internet coverage. Amazon has also booked rides on Arianespace’s Ariane 6 and Blue Origin’s New Glenn, though both vehicles remain in post-anomaly stand-downs. For ULA, the focus turns to prepping AV-115 — the next Atlas V — for NASA’s Starliner-1 cargo mission, while simultaneously fueling Vulcan production lines for Leo Vulcan 1. Key takeaways for readers and search engines • Atlas V rocket launch delivers 29 Amazon Leo satellites. • Historic final flight of Atlas V 551 from Cape Canaveral. • Night-sky visibility stretches from Florida to New England. • ULA transitions Amazon constellation missions to Vulcan. Stay tuned to our spaceflight tracker for up-to-the-minute launch schedules, live streaming links and in-depth analysis of every Atlas V and Vulcan countdown.