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Orion Spacecraft

Summary. "The primary crew vehicle for Artemis missions": it carries crew between Earth and lunar orbit, docks with the Human Landing System and Gateway, and is made of a Crew Module, a Service Module (partly ESA-provided) and a Launch Abort System (ADD Rev C, p. 62). It is a Transportation Systems element in the Human Lunar Return and Foundational Exploration segments. Since Rev C, Orion has flown crew around the Moon on Artemis II (April 2026).

All page numbers are ADD Rev C unless noted.

NASA's description

"The Orion spacecraft serves as the primary crew vehicle for Artemis missions for transporting crew between Earth and lunar orbit. The vehicle can conduct regular in-space operations in conjunction with payloads delivered by the Space Launch System and can dock with the Human Landing System and Gateway in cislunar orbit.

The Orion spacecraft includes the Crew Module, Service Module, and Launch Abort System. The Crew Module can transport four crew members beyond the Moon, providing a safe habitat from launch through landing and recovery.

The Service Module, made up of the NASA-provided Crew Module Adapter and the ESA-provided European Service Module, provides support to the crew module from launch through separation prior to entry. The Service Module provides in-space propulsion for orbital transfer, power and thermal control, attitude control, and high-altitude ascent aborts. While mated with the crew module, the Service Module also provides water and air to support the crew.

The Launch Abort System, positioned on a tower atop the Crew Module, can activate within milliseconds to propel the vehicle to safety and position the Crew Module for a safe landing." (p. 62)

At a glance

From the element one-pager (p. 62).
ADD section 2.3.12 (p. 62)
Implementing program Orion Program; printed beneath: Moon to Mars Program Office
Functional mappings Appendix B, B.3.12
Segments Human Lunar Return, Foundational Exploration
Sub-architecture Transportation Systems
Header image "Orion captures a unique view of Earth and the Moon, seen from a camera mounted on one of the spacecraft's solar arrays during the uncrewed Artemis I mission. (Credit: NASA)"
Module Provider (as printed) What it does (p. 62)
Crew Module — Carries "four crew members beyond the Moon"; "a safe habitat from launch through landing and recovery"
Service Module NASA (Crew Module Adapter) and ESA (European Service Module) Propulsion, power, thermal and attitude control, high-altitude ascent aborts; water and air while mated
Launch Abort System — Activates "within milliseconds" to carry the Crew Module to safety

Functions (ADD Appendix B.3)

B.3.12 maps 13 functions in Human Lunar Return (B.3.12.1) and 14 in Foundational Exploration (B.3.12.2) (pp. 160–161). Titles are the ADD's. None is on the Users Guide's list of Phase 1 functional gaps (Users Guide, pp. 8–10; Phase 1 functional gaps; the wiki's check).

ID Function HLR FE
FN-T-101 L Transport crew from Earth to cislunar space ✓ ✓
FN-T-105 L Transport crew from cislunar space to Earth ✓ ✓
FN-T-106 L Rendezvous, proximity operations, mating and unmating of assets in cislunar space ✓ ✓
FN-T-107 L Enable crew habitation during transit from Earth to cislunar space ✓ ✓
FN-T-111 L Enable crew habitation during transit from cislunar space to Earth ✓ ✓
FN-T-112 L Enable abort(s) to safety ✓ ✓
FN-T-211 L Transport a small amount of cargo (10s of kg) from cislunar space to Earth ✓ ✓
FN-T-217 L Transport exploration asset(s) from Earth to cislunar space ✓ ✓
FN-T-307 L Provide resources to condition refrigerated sample containers during transit from cislunar space to Earth ✓
FN-T-308 L Provide resources to condition frozen sample containers during transit from cislunar space to Earth ✓
FN-H-103 L Enable a pressurized, habitable environment in cislunar space ✓ ✓
FN-L-202 L Transfer pressurized cargo into habitable assets in cislunar space ✓ ✓
FN-L-302 L Manage waste from habitable asset(s) in cislunar space ✓ ✓
FN-U-205 L Provide intravehicular activity facilities, utilization accommodation, and resources, operable during crewed and uncrewed increments, in cislunar space ✓
FN-U-206 L Provide intravehicular utilization accommodation and resources during crew transit between Earth and cislunar space ✓ ✓
  • Against the lunar spreadsheet. The sheet's Orion column is the same in both segments, including the drop of FN-U-205 L in FE+ (Lunar function allocation).
  • Samples coming home. In FE, Orion is mapped to refrigerated and frozen conditioning from cislunar space to Earth (FN-T-307 L, FN-T-308 L) and to small cargo returns (FN-T-211 L). Three related functions are unallocated in B.5 (pp. 175–177):
    • large cargo, 100s of kg, from cislunar space to Earth (FN-T-212 L)
    • the cryogenic leg (FN-T-309 L)
    • stowing cryogenic samples on that leg (FN-U-410 L)
  • Today's capability. The state of the art in #1201 says "Orion, for example, has no active cold storage capabilities" (below). The ADD doesn't relate the two.

Gaps that mention it

Two technology gaps cite Orion as today's state of the art (tech gaps spreadsheet):

Changes since Rev C

  • Artemis II has flown. The Moon Base Users Guide carries a photo "photographed by NASA's Orion spacecraft on Monday, April 6, 2026, during the Artemis II mission" (Users Guide, p. 11), and another that "The Artemis II crew captured … on April 6, 2026, as they flew around the Moon" (p. 15).
  • Artemis III becomes an Earth-orbit test. NASA's plan announced in February 2026 adds "A risk‑reduction mission in 2027 (Artemis III) to evaluate crew‑lander interfaces in Earth orbit", because the old sequence lacked "an intermediate, in-space, test of the integrated operations in between the crew module and lander". Crew return to the surface on Artemis IV, "early 2028" (Going back to the Moon, pp. 1–2). The fact sheet doesn't name Orion. On Gateway, which Orion docks with in Rev C, see Gateway.
  • Briefed at Ignition, March 2026: Orion's part in Artemis III and the first landing. In ESDMD's notional Artemis III plan, Orion is "Crewed, RPODU capable", with goals to "Demonstrate Orion rendezvous, proximity operations, and docking with lander(s) in Earth orbit" and "Demonstrate Orion Permeable Heatshield"; mission duration "≤ 21 DAYS (Orion, mission extension with lander augmentation TBD)"; "ORION LANDING: San Diego FLETA HOT" (slide 12). The 2028 landing plan has Orion "Crewed, RPODU Capable", four crew, "≤ 21 DAYS" (slide 18). Artemis III's service module is "at KSC in testing and checkout" and its heatshield "in final assembly" (slide 10) (Ignition deck 1). The deck doesn't expand "RPODU" or "FLETA HOT".
  • Artemis III as defined in May 2026. Four crew; "the spacecraft's European-built service module will provide propulsion to circularize Orion's orbit around the planet in low Earth orbit", and SLS flies a spacer instead of an upper stage (SLS). The crew "will spend more time aboard Orion than during Artemis II", "for the first time will demonstrate the docking system performance", and "The agency also plans to test an upgraded heat shield during Orion's return to Earth to enable more flexible and robust reentry profiles". The Deep Space Network "will not be used" (Artemis III plans, May 2026). The article's "upgraded heat shield" and deck 1's "Permeable Heatshield" are not related by either source.

Moon Base relevance

Not established by the sources so far. One Phase One mission names Orion: CAPSTONE 02 "will apply navigation strategies similar to those planned for Orion's approach to a lunar lander in deep space" (CAPSTONE 02 article). That is a demonstration of a technique for Orion, not a role for Orion in the Moon Base (Missions and assets).

Elements · Transportation Systems · Space Launch System · Human Landing System · Gateway · Exploration Ground Systems · Human Lunar Return

Sources

ADD Rev C, pp. 62, 160–161, 175–177 · Lunar objective decomposition, allocation sheets · Users Guide, pp. 8–11, 15 · Going back to the Moon, pp. 1–2 · CAPSTONE 02 article · Tech gaps spreadsheet, ESDMD #0302, #1201 · Artemis III plans, May 2026