Artemis
DraftThe United States programme to return crew to the lunar surface and establish sustained cislunar operations. The technical architecture is covered in Artemis and human lunar return; this page records the programme structure.
- Announced
- 2019, building on earlier lunar programme direction
- Lead
- NASA, with international and commercial partners
- Objective
- Crewed lunar landing and sustained presence, with the south polar region as the target
- Inherited elements
- SLS and Orion trace to the Constellation programme cancelled in 2010
Elements and providers
| Element | Function | Provider |
|---|---|---|
| SLS | Heavy lift to trans-lunar injection | NASA with Boeing, Northrop Grumman, Aerojet Rocketdyne |
| Orion | Crew vehicle, deep space capable | NASA with Lockheed Martin |
| European Service Module | Orion propulsion, power, consumables | ESA with Airbus |
| Gateway PPE and HALO | Power and propulsion element, habitation module | Maxar and Northrop Grumman |
| Human Landing System | Surface access | SpaceX Starship HLS; Blue Origin Blue Moon |
| Surface mobility | Rovers, pressurised and unpressurised | Commercial and international partners including JAXA |
| CLPS deliveries | Robotic payload delivery preceding crew | Multiple commercial providers |
The mixture of procurement models is characteristic. SLS and Orion are cost-plus developments with long heritage; HLS and CLPS are fixed-price service purchases. The programme therefore contains both models side by side, which makes it a useful comparison case for the argument in Space agencies.
Mission sequence
| Mission | Profile | Status |
|---|---|---|
| Artemis I | Uncrewed Orion to a distant retrograde lunar orbit and return | Flown November to December 2022, 25.5 days |
| Artemis II | Crewed lunar flyby, no landing | In preparation |
| Artemis III | Crewed landing near the south pole | Depends on HLS readiness |
| Artemis IV onward | Gateway assembly, longer surface stays | Planned |
Artemis I validated SLS, Orion, the trajectory and the heat shield at lunar return velocity of about 11 km/s, which is considerably more demanding than return from low Earth orbit. The heat shield exhibited more char loss than predicted, and characterising that behaviour became significant work before crewing the vehicle.
Partners
Artemis is explicitly a coalition programme rather than a national one.
| Partner | Contribution |
|---|---|
| ESA | Orion service modules; Gateway modules |
| JAXA | Gateway contributions; pressurised lunar rover |
| CSA | Canadarm3 for Gateway |
| Others | Various contributions and astronaut flight opportunities |
The Artemis Accords are a separate instrument: bilateral agreements setting out principles for civil space activity including transparency, interoperability, emergency assistance, registration, scientific data release, heritage site preservation, deconfliction through safety zones, and debris mitigation.
Their significance is that they attempt to establish operating norms outside the United Nations treaty process, which has produced no new binding space treaty since 1979. The criticism is that a coalition led by one state, interpreting the Outer Space Treaty in ways favourable to resource extraction, is not equivalent to a multilateral agreement, and that safety zones sit uneasily with the non-appropriation principle. See Policy and regulation.
Programme risk
| Risk | Character |
|---|---|
| HLS readiness | The dominant schedule driver; depends on orbital cryogenic refuelling, never demonstrated at scale |
| Surface systems | Next-generation EVA suits are a long-lead item with their own development history |
| SLS cost and cadence | An expendable vehicle at low flight rate; a cost question rather than a technical one |
| Political continuity | The programme spans multiple administrations; its predecessor was cancelled mid-development |
The last row is not technical and is historically the most decisive. Constellation was cancelled in 2010 after five years and substantial expenditure, and the elements that survived did so by being repurposed into what became SLS and Orion. A programme whose critical path is a decade long is exposed to changes in priority that no engineering margin covers.
Programme against architecture
A distinction worth maintaining. Artemis is a programme: a set of funded elements, contracts, partners and missions. The architecture is the technical approach: SLS and Orion to a near-rectilinear halo orbit, transfer to a separately launched lander, descend, ascend, transfer back, return.
The architecture is partly a consequence of the programme rather than of engineering optimisation. Orion goes to NRHO rather than low lunar orbit because its service module lacks the delta-v for the latter, and it has that service module because of decisions made in a predecessor programme. A clean-sheet architecture would likely differ.
That is not a criticism so much as an observation about how large government programmes work: inherited elements constrain the architecture, and the architecture is then optimised within those constraints.
References
- Smith, M. et al. “The Artemis Program: An Overview of NASA’s Activities to Return Humans to the Moon”, IEEE Aerospace Conference, 2020.
- NASA Office of Inspector General audit reports on SLS, Orion, HLS and EVA suits.
- The Artemis Accords, US Department of State, 2020 and subsequent signatures.
- NASA Artemis mission documentation and Artemis I post-flight reports.