Countdown begins for long-awaited Artemis II moon mission

For the archetypal clip successful fractional a century, countdown clocks began ticking Monday toward motorboat of a three-man one-woman crew connected a trip to the satellite and back, a large measurement successful NASA's accelerated thrust to found a lunar beachhead with landings successful 2028, followed by operation of a satellite base.

With forecasters continuing to foretell an 80% accidental of favorable weather, Artemis II commandant Reid Wiseman, Victor Glover, Christina Koch and Canadian astronaut Jeremy Hansen anticipation to strap into their Orion capsule and blast disconnected atop a elephantine Space Launch System rocket astatine 6:24 p.m. EDT Wednesday.

Photographers acceptable up distant cameras adjacent motorboat pad 39B astatine the Kennedy Space Center connected Sunday to seizure the immense Space Launch System rocket arsenic it blasts disconnected Wednesday, sending 4 astronauts connected a travel to the moon. NASA

"We conscionable wrapped up our L(aunch)-minus 2 (day) ngo absorption squad reappraisal and the squad polled spell to proceed towards the planned April 1 motorboat attempt," said Amit Kshatriya, the NASA subordinate administrator.

"The MMT walked done the accustomed readiness items — conveyance status, crushed systems, formation hardware and the integrated motorboat operations timeline," Kshatriya said. "We besides reviewed the astir caller engineering assessments (and) the squad concluded that everything continues to look good, and determination are nary issues preventing america from pressing ahead."

Assuming an on-time liftoff, the unit volition walk down the satellite adjacent Monday, sailing 4,100 miles supra the lunar acold broadside earlier heading backmost to Earth for a Pacific Ocean splashdown connected the confederate California seashore connected April 10. Mission duration: 9 days and 1 hour, covering astir 700,000 miles.

Countdown clocks began ticking astatine 4:44 p.m. EDT Monday. Engineers planned to walk the archetypal hours of the cautiously orchestrated process readying the SLS and crushed systems for propellant loading and powering up the crew's Orion capsule. The astronauts, meanwhile, planned to bask meal with household members astatine a authorities formation location astatine the adjacent Cape Canaveral Space Force Station

On Tuesday, the motorboat squad volition proceed powerup and checkout operations, investigating communications circuits and loading "late stow" experimentation packages.

Launch Director Charlie Blackwell-Thompson walks reporters done Artemis II countdown procedures during a quality league astatine the Kennedy Space Center Monday afternoon. NASA

Early Wednesday, cockpit switches volition beryllium configured for launch, prima trackers and navigation cogwheel volition beryllium powered connected and Launch Director Charlie Blackwell-Thompson volition canvass her motorboat squad to marque definite they're "go" for propellant loading, scheduled to statesman astatine 7:44 a.m.

The halfway signifier of the SLS rocket volition beryllium filled with 537,000 gallons of supercold liquid hydrogen substance and 196,000 gallons of liquid oxygen. The rocket's precocious stage, the Interim Cryogenic Propulsion Stage, oregon ICPS, volition beryllium loaded with different 24,000 gallons of liquid hydrogen and oxygen.

The process volition instrumentality astir five-and-a-half hours to complete. While substance loading is underway, Wiseman and his crewmates volition beryllium awakened and fixed a upwind briefing earlier donning their unit suits and heading for motorboat pad 39B to strap successful aboard the Orion capsule soon earlier 2:30 p.m.

With the countdown successful a last 30-minute built-in clasp astatine the T-minus 10-minute mark, Blackwell-Thompson volition canvass the motorboat squad again earlier giving support to resume the countdown.

A rainbow appears supra the countdown timepiece arsenic NASA's Artemis II Space Launch System rocket and Orion spacecraft are prepared for motorboat connected Launch Pad 39B astatine the Kennedy Space Center connected March 30, 2026, successful Cape Canaveral, Florida. Joe Raedle / Getty Images

When the clasp ends astatine 6:14 p.m., the crushed motorboat sequencer machine volition instrumentality implicit the countdown, the motorboat pad's unit entree limb volition beryllium retracted and auxiliary powerfulness units volition rotation up to supply hydraulic power. The 4 main engines astatine the basal of the SLS halfway signifier volition statesman igniting six seconds earlier liftoff.

After a lightning circular of machine checks to verify the engines are moving normally, commands volition beryllium sent to occurrence the rocket's 2 strap-on solid-fuel boosters. As the boosters roar to life, explosive bolts astatine the basal of each booster volition shatter, and the SLS rocket volition statesman climbing distant atop 8.8 cardinal pounds of thrust.

At that point, formation controllers astatine the Johnson Space Center successful Houston volition instrumentality implicit from the motorboat team, monitoring ascent telemetry, providing guidance to the astronauts and managing a analyzable formation plan. NASA's archetypal crewed moonshot successful much than fractional a period volition yet beryllium underway.

"It is an breathtaking time," said Blackwell-Thompson. "It's an breathtaking clip for this squad and our unit and truly our federation and the world. ... We'll alert erstwhile this hardware is ready, and we'll spot if it's acceptable to spell successful conscionable a mates of days. But certainly, each indications are close present we are successful excellent, fantabulous shape."

In:

• Artemis Program
• Space
• NASA