NASA maps out Artemis III's three-rocket LEO rehearsal — summer 2027 target, no firm date yet

NASA has never tried anything quite like this. On October 23, at a press conference at Kennedy Space Center that ran more than two hours, agency officials unveiled the most detailed picture yet of Artemis III — a crewed mission that will launch three of the world's most powerful rockets within days of each other, dock a crew capsule with two competing commercial moon landers, and do all of it in low Earth orbit, where a mistake is survivable. The target is summer 2027. A firm launch date does not yet exist.

We're launching three of the most powerful rockets in the world, and undertaking what is likely the most complicated launch campaign ever undertaken.— Jeremy Parsons, NASA Artemis Program Manager

The three rockets are NASA's Space Launch System (SLS), SpaceX's Starship, and Blue Origin's New Glenn — all launching from Florida's Space Coast. The sequence matters as much as the hardware: New Glenn goes first, carrying a test version of Blue Origin's Blue Moon Mark 2 lunar lander to a circular orbit about 273 miles above Earth. SLS follows days later, lifting the four-person Artemis III crew aboard NASA's Orion capsule. Starship launches last, later in the mission, because its design limits how long it can safely remain in orbit.

The four crew members are NASA astronauts Randy Bresnik, Andre Douglas, and Frank Rubio, and ESA astronaut Luca Parmitano. After launch, Orion will enter a highly elliptical orbit — as close as 18 miles to Earth and as far as 1,122 miles out — before maneuvering to a circular orbit at roughly 345 miles for what Parsons described as thermal stabilization. Orion was built for deep space, and managing heat in the more intense environment of low Earth orbit requires careful handling.

Orion was built as a deep-space vehicle, and so we're going to have to really manage the thermal environments, which are higher in a low Earth orbit.— Jeremy Parsons, NASA Artemis Program Manager

On Flight Day 3, Orion meets Blue Moon at an altitude of 273 miles. The crew will spend roughly two days docked with the lander — opening the hatch, entering the cabin, evaluating life-support systems, testing emergency scenarios, and practicing dual-vehicle control. The Blue Moon test article carries many of the avionics, software, and crew-cabin systems planned for actual lunar missions, making this the first chance to evaluate them as an integrated vehicle in space, according to NASA.

Over the next two days, the crew will conduct operations docked with Blue Moon. They're going to open up the hatch. They're going to enter the lander. They're going to evaluate the environmental controls, the life support systems.— Jeremy Parsons, NASA Artemis Program Manager

Around Flight Day 6, Starship launches. It carries a specially built docking adapter at its nose and enters a lower orbit — about 206 nautical miles — optimized for communications coverage. Orion meets Starship on Flight Day 8 at roughly 237 miles altitude, but this encounter is deliberately brief: about two hours, with the crew staying inside Orion the entire time. The goal is to measure the forces involved in docking, test integrated software and communications, and understand how the two very differently sized vehicles behave when connected.

The demonstration with Starship is shorter, about two hours. The crew will not enter the Starship during the mission, but it gives us critical data and allows us to really understand the forces of docking, how we're going to push, how we're going to work together.— Jeremy Parsons, NASA Artemis Program Manager

After undocking from Starship, the mission continues for another six to nine days. The crew will evaluate survival suits — a task that did not get completed during the Artemis II flight around the moon — and carry out health assessments, scientific experiments, and technology demonstrations before a parachute-aided ocean splashdown. The nominal mission length is 14 days, though it could stretch to 17.

The entire Artemis III flight stays in Earth orbit — it does not go to the moon. Its purpose is to rehearse the procedures, hardware interfaces, and mission-control coordination that will be needed when Artemis IV attempts the first crewed lunar landing since Apollo 17 in 1972, currently targeted for 2028. NASA has not yet decided which lander — Blue Moon or Starship — will carry astronauts to the surface on Artemis IV.

We have no intention of surrendering a viable path to the surface before the data and schedule compels us to do so.— Jared Isaacman, NASA Administrator

Parsons said that regardless of which lander NASA selects for Artemis IV, both Blue Origin and SpaceX are planning for lunar landing missions in 2028. The two vehicles represent fundamentally different approaches: on Blue Origin missions, Orion would meet Blue Moon in lunar orbit; on SpaceX missions, Starship would dock with Orion in Earth orbit and propel it toward the moon.

The schedule is under pressure. In an internal memo last month, Isaacman told NASA employees that Artemis III was roughly 90 days behind schedule. The biggest driver, Parsons said, has been the supply chain for the lunar landers. Blue Origin has not returned New Glenn to flight since the rocket's on-pad explosion in May destroyed the company's Florida launch site, and Blue Moon Mark 2 has never flown. SpaceX completed Starship's first uncrewed orbital flight only in September, and test flights have revealed issues with the reliability of its Raptor engines.

Most of what they're seeing now is issues impacting reuse.— Amit Kshatriya, NASA Associate Administrator

Kshatriya told CNN that the current Raptor engine problems affect SpaceX's ability to reuse Starship — and thus its economics — but do not mean Starship is off track for Artemis III. NASA's requirement is straightforward: get a Starship to orbit and keep it there long enough to complete the docking test. SpaceX plans to pull a relatively bare-bones Starship version off its production line for the mission while the company continues developing more advanced iterations.

Parsons said NASA expects multiple launches of both New Glenn and Starship before Artemis III flies, which he described as a key source of confidence. SpaceX is also expected to attempt the first-ever in-orbit propellant transfer between two Starship vehicles in early 2027 — a capability essential for any Starship moon landing, since transferring super-chilled cryogenic propellants between spacecraft in orbit has never been done.

You will have multiple launches of Starship before we go conduct Artemis III, and you will have multiple launches of the Blue Origin New Glenn vehicle from the rebuilt pad before we go launch Artemis III, and so that's going to give us a lot of confidence.— Jeremy Parsons, NASA Artemis Program Manager

Isaacman framed the urgency in explicitly competitive terms, warning that the United States is in a new space race with China and cannot afford to slow down. He has previously said he expects China to send a crewed mission around the moon in 2027.

We will never launch until we are ready, but we will not accept that great achievements simply require more time and more money, nor will NASA sit idly by and watch one of the most consequential moments of this new century pass [to] our overseas competitors.— Jared Isaacman, NASA Administrator

Every vendor and partner should understand that when a schedule is broken, NASA personnel will be knocking on the door, and not to observe, not to write a paper or convene a committee, but to roll up their sleeves and solve problems.— Jared Isaacman, NASA Administrator

The next concrete milestone on the path to Artemis III is a year-end tanking test for SLS and Orion, according to AIAA's Aerospace America. After that, the summer 2027 launch window — and the question of whether the 90-day schedule gap can be closed — will come into sharper focus.

Why it matters — Artemis III is the last major rehearsal before NASA attempts to land astronauts on the moon for the first time in more than 50 years — and whether its unprecedented three-rocket, two-lander choreography can stay on schedule will determine whether the US or China reaches the lunar surface first.

Reported by space.com, nasa.gov, cnn.com, payloadspace.com, aerospaceamerica.aiaa.org