Artemis III Explained: Mission Profile, the Gemini Parallel and Why Docking in Earth Orbit Comes Before the Moon

By The SpaceInfo Club Space Engineer, founder of SpaceInfo Club

November 12, 2026 10 min read

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Artemis III will not land on the Moon. Planned for mid-2027, it is a crewed test flight in low Earth orbit in which NASA’s Orion spacecraft, launched on the Space Launch System, will rendezvous and dock with test versions of two commercial landers: Blue Origin’s Blue Moon and SpaceX’s Starship. It is the kind of mission NASA flew in the 1960s during Project Gemini, and for the same reason: before you go to the Moon, you have to prove that spacecraft can find each other, join, and work together. This article walks through the current mission profile, the Gemini parallel, why docking in Earth orbit is so important, and where SLS, Starship and Blue Moon stand today.

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Artemis III at a glance

Crew: Randy Bresnik (commander), Luca Parmitano of ESA (pilot), Andre Douglas and Frank Rubio. Bob Hines is the backup. Parmitano is the first ESA astronaut assigned to an Artemis mission.
Target: mid-2027, with a duration of about two weeks, according to NASA.
Orbit: low Earth orbit, with Orion flying a circular orbit throughout the mission.
Launch vehicles: SLS (Orion), New Glenn (Blue Moon test article) and Starship (Starship test article), from three different pads.
Goal: validate rendezvous, docking and joint operations with two different human landing systems, ahead of the first crewed landing on Artemis IV in 2028.

The mission profile, step by step

The sequence below follows NASA’s published description and the more detailed timeline reported by SpacePolicyOnline.

Blue Moon goes first. Blue Origin launches an uncrewed Blue Moon test article on New Glenn from Cape Canaveral. It uses the architecture of the Mark 2 crew lander, including avionics, flight software, life support and a crew cabin, and it can wait in orbit for up to 30 days, which gives teams time to check its condition before the crew commits.
Orion launches. SLS lifts Orion from Launch Complex 39B at Kennedy Space Center. Because the mission stays in Earth orbit, a structural spacer built by NASA replaces the upper stage flown on Artemis II.
First docking: Blue Moon. After checkouts, Orion rendezvouses with Blue Moon and docks on the side of the lander, next to its crew cabin. The two stay docked for about two days, and up to two astronauts, wearing Orion crew survival suits, enter the lander to test environmental control, avionics and interoperability. A suited mass simulator on board reports cabin conditions in real time. SpacePolicyOnline places the docking on Day 3.
Second docking: Starship. Only after Orion undocks does SpaceX launch its Starship Version 3 test article, about 52 metres tall, with a docking system on its nose (SpacePolicyOnline places the launch on Day 6). Orion docks nose-to-nose with it. The crew does not enter Starship. NASA describes about a day of checkouts, while SpacePolicyOnline reports a docked time of about two hours, so the exact duration is still a detail to watch.
Return. Orion undocks and returns to a parachute splashdown in the Pacific Ocean, where a US Navy and NASA team recovers the crew.

Roles are deliberately chosen to match the lunar configuration: Orion is always the active “chaser” and the landers are the targets. The mission also flies Orion’s docking system for the first time, and tests how the docked stack moves and who controls it: Orion’s software during the Blue Moon phase, SpaceX’s software during the Starship phase.

NASA’s Artemis program manager Jeremy Parsons has described the flight as a “highly choreographed dance with a demanding launch sequence across multiple launch pads”. Three heavy rockets, three pads and two commercial providers make it logistically one of the most complicated missions NASA has planned. For crewed spacecraft the closest precedent is Soyuz T-15 in 1986, the only earlier crewed mission to rendezvous with more than one crew-capable spacecraft, visiting Salyut 7 and then Mir.

The Gemini parallel

Project Gemini flew ten crewed missions between March 1965 and November 1966, about 20 months, and NASA describes it as the training ground for Apollo. Its core job was to teach NASA how to operate in orbit: long-duration flight, spacewalks, and above all rendezvous and docking. The key steps:

Gemini 6 and 7 (December 1965): the first rendezvous between two crewed spacecraft in orbit.
Gemini 8 (16 March 1966): Neil Armstrong and Dave Scott made the first docking between two vehicles in Earth orbit, with an uncrewed Agena target. About half an hour later, a stuck thruster sent the docked vehicles into an increasing roll. Armstrong undocked, regained control with the re-entry control system and the crew returned early, a lesson in how a docking failure can become an emergency.
Gemini 10 (July 1966): John Young and Michael Collins docked with their Agena and later rendezvoused with the Agena left behind by Gemini 8, a dual rendezvous involving three spacecraft, and tested navigation techniques considered for Apollo.
Gemini 11 (September 1966): docking before the end of the first orbit, a more aggressive rendezvous profile.
Gemini 12 (November 1966): after a radar problem, Jim Lovell completed the rendezvous by hand using a sextant and charts, then Buzz Aldrin performed a record spacewalk. NASA concluded its crews had the skills needed for lunar missions.

The parallel with Artemis III is useful, with some limits. In both cases, a test in Earth orbit comes before the lunar step, in a safer place where a return home is quick. Artemis III also has an Apollo-era cousin: Apollo 9, which tested the lunar module in Earth orbit in March 1969, is the comparison drawn by Planetary Society experts, and NASA Administrator Jared Isaacman has also used the Apollo-era progression to justify an intermediate test before a landing. The differences are as important as the similarities. Gemini docked with an uncrewed Agena, a simple, purpose-built target. On Artemis III, the targets are two large, very different commercial vehicles, each with its own docking system and software, and one of them (Starship) is meant to be refuelled in orbit. And Gemini flew roughly every two months, while NASA’s target for Artemis is a launch about every ten months.

Why docking in low Earth orbit matters so much

Docking is not a side objective. The 2028 landing plans depend on it in several ways.

It is how the crew meets the lander. After Artemis III, the crewed landing requires Orion to meet a lander, either in lunar orbit (Blue Origin) or in Earth orbit (SpaceX, where a fully fuelled Starship would dock with Orion and send the stack to the Moon). Each of those encounters has to work the first time with astronauts on board.

It is how Starship gets its propellant. Starship needs in-space propellant transfer, and NASA estimates at least 15 Starship refuelling launches for Artemis IV. That makes docking between spacecraft, and cryogenic fuel transfer, a repeated operation instead of a one-off. Artemis III tests the docking ports and the interfaces that refuelling relies on.

It is how interfaces get proven. Docking tests more than a mechanism: structures, power and data connections, communications, how the docked stack handles, and the handover of control between two flight software systems. These are the kinds of integration issues that Gemini 8 and Gemini 12 revealed in the 1960s.

It de-risks the choice of lander. NASA is preserving two landing paths for 2028. How well each provider performs on Artemis III is expected to help determine which lander takes astronauts to the surface first.

Where the hardware stands today

SLS and Orion

SLS is the most advanced element. On 30 September 2026, teams finished stacking the twin solid rocket boosters for Artemis III in the Vehicle Assembly Building, and all four RS-25 engines are installed on the core stage. The core stage is next to be joined to the boosters, completing the “short stack” configuration (without an upper stage), and the rocket will roll to Pad 39B for a tanking test in the coming months. The spacer’s primary structure is complete, and the spacer and stage adapters are due to ship to Kennedy early next year. Orion is in testing, and ESA and Airbus recently inspected the solar array wings of its service module. Artemis II, which flew in April 2026, found a helium leak in Orion’s propulsion system, which NASA called acceptable but likely to need a redesign of the valve system.

Starship

Starship V3 flew for the first time on Flight 12 in May 2026, followed by Flight 13 in July. On 28 September 2026, Flight 14 became the first Starship flight to reach orbit, deploying 26 Starlink V3 satellites before the mission was cut short after an engine problem (see our Flight 14 launch-day breakdown). Two milestones that matter most for NASA have not yet happened: orbital propellant transfer between two ships, and a ship catch. For Artemis III, SpaceX is building a Starship test article with a nose docking port, and a docking system NASA says was qualified in 2023. As of NASA’s July update, the launch pad for the test article had not been chosen between two Florida towers under construction, at LC-39A and SLC-37.

Blue Moon and New Glenn

Blue Origin’s path has been bumpier. A New Glenn rocket exploded on 28 May 2026 during a static fire test at Launch Complex 36, destroying the transporter-erector and damaging the pad. Blue Origin repaired the access tower and is moving to a hybrid process in which the rocket is rolled out horizontally and erected at the pad. According to reporting on a Blue Origin memo on 5 November, New Glenn’s return to flight has slipped to January 2027. The company’s uncrewed Blue Moon Mark 1 lander “Endurance”, which finished vacuum-chamber testing at NASA’s Johnson Space Center earlier this year, has been delayed to early 2027. New Glenn is also contracted to launch the Blue Moon test article for Artemis III, and Blue Origin finished development ground testing of its pressurized docking system in 2026. The schedule therefore leaves little margin between New Glenn’s return and a mid-2027 Artemis III.

What to watch next

NASA’s October 2026 status said Artemis III remains on track for mid-2027. The next milestones to follow are the Artemis III tanking test at Pad 39B, SpaceX’s next Starship flight and any orbital refuelling demonstration, and New Glenn’s return to flight. All dates in this article are targets, not commitments.

Frequently asked questions

Will Artemis III land on the Moon? No. Artemis III is a crewed flight in low Earth orbit, planned for mid-2027, to test rendezvous and docking with the Blue Origin and SpaceX landers. The first planned landing is Artemis IV in 2028.

What happens on Artemis III? Orion launches on SLS and docks with a Blue Moon test article for about two days, with up to two astronauts entering the lander. It then docks with a Starship test article, without crew entering it, before splashing down in the Pacific after about two weeks.

Why is Artemis III compared to Project Gemini? Because, like Gemini, it tests rendezvous and docking in Earth orbit before the lunar step, preparing crews and ground teams for the harder missions to come.

Why is docking in Earth orbit so important? The landing plans rely on Orion meeting a lander, and Starship needs propellant transferred between vehicles in orbit. Both require reliable docking between spacecraft built by different organisations.

Who is flying on Artemis III? Randy Bresnik, Luca Parmitano (ESA), Andre Douglas and Frank Rubio, with Bob Hines as backup.

Is New Glenn’s delay a problem for Artemis III? New Glenn must launch the Blue Moon test article before Orion can dock with it, and its return to flight has slipped to January 2027, so the Blue Origin part of the mission is the schedule element to watch.