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The Deep Space Habitat (DSH) is a series of concepts explored between 2012 and 2018 by NASA for methods to support crewed exploration missions to the Moon, asteroids, and eventually Mars.^[1] Some of these concepts were eventually used in the Lunar Gateway program.

Overview

Since 2012, numerous iterations of large lunar and Mars transport habitats have been conceived in previous studies to be launched with the Space Launch System (SLS),^[2]^[3] and are intended to also be compatible with the Orion capsule. Variations of the designs would be used for the Lunar Gateway and the Deep Space Transport.^[2]

Early preliminary concepts considered 60-day and 500-day mission configurations, composed of International Space Station-derived hardware, the Orion crew capsule and various support craft.^[4] The habitat would be equipped with at least one International Docking System Standard (IDSS) docking system. Developing a deep space habitat would allow a crew to live and work safely in space for about one year on missions to explore cislunar space, Mars, and some near-Earth asteroids.

In 2015, NASA funded studies for several types of deep space habitat concepts under the Next Space Technologies for Exploration Partnerships (NextSTEP).^[5] Lockheed Martin, the main contractor of the Orion capsule, also produced in 2018 a Deep Space Habitat concept.^[6] These concept studies were intended to help NASA decide on a final design for the habitat element for the Lunar Gateway.^[7]

Configurations

HAB/MPLM

MPLM stands for Multi-Purpose Logistics Module^[6]

60 Day Mission – The basic 60-day mission variant would consist of a Cryogenic Propulsion Stage (CPS), ISS Destiny-derived lab module, and an airlock/tunnel. In addition, a mission-specific support craft, such as the FlexCraft or the Multi-Mission Space Exploration Vehicle (MMSEV) would be docked to the airlock/tunnel. The Destiny-derived lab houses both the crew quarters and the ECLSS components.^[4]
500 Day Mission – The 500 Day mission variant would consist of the same 60-day crew habitat and crew size. Mass increases would result from the addition of a Multi-Purpose Logistics Module (MPLM) to provide additional supply storage for the extended mission duration.^[4] It would be 8 m long and 4.5 m in diameter.^[4]

MPLM/Node 1

60 Day Mission – The basic vehicle elements for this configuration would include a CPS, a MPLM, Utility tunnel/airlock, Node 4 Structural Test Article. The Node element would allow for the attachment of more than one FlexCraft or Space Exploration Vehicle (MMSEV). The Habitat would be crew serviceable at the front of the Node element opposite the tunnel.^[8]
500 Day Mission – This 500-day mission variant would have a second MPLM attached to the front on the vehicle as well as add a Cupola to the Node section.^[8]

Suggested support craft

Orion, is being developed by NASA, Lockheed Martin, and Airbus Defence and Space for crewed deep space travel. It is capable of carrying 4 crew, and able to withstand re-entry speeds from lunar or Martian trajectories.
MMSEV – a NASA-designed servicing craft.^[9] Capable of supporting a crew of two for up to 2 weeks and having suitports for extravehicular activity (EVA).
DSH FlexCraft – a single crew vehicle, attached to the DSH similar to a visiting craft to the International Space Station.^[10] FlexCraft would be used by an individual astronaut for EVA or tele-operated activities.^[11] The hardware would connect directly to the DSH airlock and would share a common atmosphere as the parent ship to provide immediate access to space without pre-breathing by DSH crew. With a pressurized volume of 0.62 m³, the FlexCraft is meant for only one person with an "excursion time" of less than 8 hours. Its propellant would be gaseous nitrogen, and it would have a Delta-V of 21 m/s with a total gross mass projected at 452 kg. An already-identified limitation is that it cannot be used during solar particle events. The FlexCraft concept was first presented in a 2012 conference paper by Brand N. Griffin.^[12]

References

^ Chris Gebhardt. Deep Space Habitat module concepts outlined for BEO exploration. NASA Spaceflight. 30 March 2012.
^ ^a ^b V. Smitherman, D. H. Needham, R. Lewis. Research Possibilities beyond Deep Space Gateway. Deep Space Gateway Science Workshop 2018 (LPI Contrib. No. 2063). NASA.
^ Deep Space Habitat Configurations (Based on International Space Station Systems) Archived 2015-07-15 at the Wayback Machine, AES Habitation Project, March 2012.
^ ^a ^b ^c ^d "Delving Deeper into NASA's DSH configurations and support craft". nasaspaceflight.com. 3 April 2012.
^ Messier, Doug (August 11, 2016). "A Closer Look at NextSTEP-2 Deep Space Habitat Concepts". Parabolic Arc. Retrieved August 14, 2016.
^ ^a ^b Lockheed Martin Shows off its new Space Habitat. Matt Williams, Universe Today. 21 August 2018.
^ Jason Davis. Some snark (and details!) about NASA's proposed lunar space station. The Planetary Society. February 26, 2018.
^ ^a ^b Smitherman, David; Griffin, Brand N. (August 4, 2014). Habitat Concepts for Deep Space Exploration (PDF) (Report). NASA. Retrieved September 26, 2023.
^ "Space Exploration Vehicle Concept" (PDF). NASA. Retrieved April 16, 2018.
^ "NASA FlexCraft 2015 – Marshall Space Flight Center". www.youtube.com. MoonlightFoxTV. Retrieved April 16, 2018.
^ Gebhardt, Chris (April 2, 2012). "Delving Deeper into NASA's DSH configurations and support craft". NASASpaceflight. Retrieved September 26, 2023.
^ Griffin, Brand N. (March 15, 2012). Benefits of a Single-Person Spacecraft for Weightless Operations. 13th ASCE Earth and Space Conference; 15–18 April 2012; Pasadena, California; United States. 42nd International Conference on Environmental Systems; San Diego, California. United States. hdl:2060/20120013602. 20120013602.