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| Altair (lunar lander) | |
|---|---|
| Name | Altair |
| Caption | Artist's concept of the Altair lunar lander |
| Country | United States |
| Operator | National Aeronautics and Space Administration |
| Applications | Crewed lunar landing |
| Spacecraft type | Lunar lander |
| Manufacturer | Lockheed Martin, Northrop Grumman, Sierra Nevada Corporation |
| Mass | planned ~15,000 kg (descent stage) |
| Status | Cancelled |
Altair (lunar lander) was a proposed crewed lunar lander concept developed under the Constellation program by the National Aeronautics and Space Administration with industrial partners including Lockheed Martin, Northrop Grumman, and Sierra Nevada Corporation. Intended to transport astronauts from a lunar orbiting outpost to the surface of the Moon and back, Altair formed a central element of a planned return to the lunar surface reminiscent of earlier programs like Apollo program. Cancellation of the Constellation program curtailed Altair's development, but its design influenced later concepts such as elements of the Artemis program and commercial lander proposals.
Altair was conceived during the mid-2000s as a crewed descent and ascent vehicle to ferry two to four astronauts between a lunar orbiting facility and the lunar surface. The vehicle concept was tied to the Ares I and Ares V launch systems and the Orion crew vehicle, reflecting an integrated architecture similar to historic links between Saturn V and the Apollo Lunar Module. Altair's design goals included long-duration surface stays, support for extravehicular activity and scientific exploration, and compatibility with planned lunar bases near polar regions examined by missions such as LCROSS and Lunar Reconnaissance Orbiter.
Altair's architecture featured a two-stage configuration with a descent stage providing propellant tanks, landing legs, cargo stowage, and ascent engines mounted beneath an ascent stage containing the pressurized crew cabin and avionics. The ascent stage drew lineage from the Apollo Lunar Module crew compartment and incorporated modern materials used by contractors like Boeing and General Dynamics. Specifications under study included gross masses comparable to large spacecraft from Roscosmos and European Space Agency studies, with descent delta-v requirements matching trajectories studied after Project Constellation trade studies. Systems planned for Altair referenced standards from International Space Station development, avionics approaches used on X-37B, and life support lessons from Skylab.
Conceptual development began after the Vision for Space Exploration announcement and the 2004 policy directive that led to the Constellation program. NASA selected industrial teams, awarding contracts during the late 2000s to firms including Lockheed Martin and Northrop Grumman for advanced studies, echoing earlier procurement approaches used in Space Shuttle development. Altair's preliminary design phase included environmental testing at facilities like the Johnson Space Center and vibration tests analogous to those used for Hubble Space Telescope servicing missions. Budgetary pressures and shifting priorities culminated in the 2010 Review of U.S. Human Spaceflight Plans Committee recommendations, which along with congressional action led to program restructuring and eventual cancellation.
Mission concepts paired Altair with the Orion crew vehicle and an Earth–Moon Lagrange point or low lunar orbit staging location, similar in role to the Apollo Command/Service Module's parking orbit. Plans included launches on Ares I for crew and Ares V for cargo, with rendezvous and docking operations informed by procedures from Gemini program and Space Shuttle missions. Surface operations anticipated support from robotic precursors such as Lunar Reconnaissance Orbiter and logistical resupply using cargo landers akin to later Commercial Lunar Payload Services proposals. Crew timelines considered extended stays like those in Expedition 1 aboard the International Space Station, with contingency abort modes drawing from Soyuz and Apollo heritage.
Altair's propulsion suite was to employ cryogenic engines using liquid oxygen and liquid hydrogen for high specific impulse, reflecting technology demonstrated on engines like the RL10 and in stages such as the Centaur (rocket stage). Guidance, navigation, and control systems planned for Altair adopted avionics architectures influenced by Orion (spacecraft), Mars Science Laboratory entry guidance algorithms, and inertial systems comparable to those used on GPS satellites. Landing precision and hazard avoidance strategies referenced techniques tested on missions including Lunar Reconnaissance Orbiter reconnaissance and proposed technologies validated by Project Morpheus vertical testbeds.
Altair's internal and external payload capacity was sized to carry scientific instruments, rovers, sample collection gear, and life-support consumables, facilitating investigations into lunar geology, volatiles, and in-situ resource utilization—areas explored by Apollo program samples and probed by LCROSS and Chandrayaan-1. Scientific objectives emphasized polar volatiles mapping, regolith characterization, and testing technologies for Mars precursor missions, aligning with priorities set by panels such as the Planetary Science Decadal Survey. Payload accommodation considered standards from Planetary Data System formats and interfaces used by payloads flown on Mars rovers.
The 2010 cancellation of the Constellation program effectively terminated Altair development, but technical work and trade studies informed later efforts within NASA and commercial initiatives. Engineering lessons from Altair influenced design choices in the Artemis program's commercial partnerships, lander concepts emerging from Commercial Lunar Payload Services, and international planning by agencies such as European Space Agency and Japan Aerospace Exploration Agency. Although never flown, Altair contributed to the institutional memory linking Apollo program heritage with 21st-century exploration strategies and industrial baselines used by contractors across subsequent lunar initiatives.
Category:Lunar landers Category:Cancelled spacecraft projects