Power and Propulsion Element

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Power and Propulsion Element
Gateway - PPE and HALO 004.png
Artist's impression of the PPE, attached to HALO, firing its engines in lunar orbit.
NamesPPE
Asteroid Redirect Vehicle
Mission type Power and propulsion module
Operator Northrop Grumman / NASA
Mission duration15 years (planned)
Spacecraft properties
SpacecraftPPE
Manufacturer Maxar Technologies
Launch mass5,000 kg (11,000 lb) [1]
Power60 kW
Start of mission
Launch date2027 (planned) [2]
Rocket Falcon Heavy
Launch site Kennedy Space Center, LC-39A
Contractor SpaceX
←  CAPSTONE
HALO  →

The Power and Propulsion Element (PPE), previously known as the Asteroid Redirect Vehicle propulsion system, is a planned solar electric ion propulsion module being developed by Maxar Technologies for NASA. It is one of the major components of the Lunar Gateway. The PPE will allow access to the entire lunar surface and a wide range of lunar orbits and double as a space tug for visiting craft. [3] [4]

Contents

The PPE originally started development at the Jet Propulsion Laboratory as a part of the now cancelled Asteroid Redirect Mission, but is now led and managed by the NASA John H. Glenn Research Center, in Cleveland, Ohio. When ARM was cancelled, the solar electric propulsion was repurposed as the PPE for the Gateway. [5] [6] The PPE is designed to be able to transfer the reusable Gateway to lunar orbit. [4] It will also serve as the communications center of the Gateway. [7] The PPE is intended to have a launch mass of 5,000 kg (11,000 lb) with propellant accounting for half that mass [1] and the capability to generate 50 kW [8] of solar electric power using Roll Out Solar Arrays for its Hall-effect thrusters, which can be supplemented by chemical propulsion. [9] It is currently planned to launch on a Falcon Heavy no earlier than 2027 along with the HALO module. [2] [10]

Development

Asteroid Redirect Vehicle bus

The Asteroid Redirect Vehicle was a robotic, high performance solar electric spacecraft for the Asteroid Redirect Mission (ARM). The mission was to send the spacecraft to a near-Earth asteroid and capture a multi-ton boulder from the surface with a grappling device. It would then transport the asteroid into orbit around the Moon where crewed missions to study it could be conducted more easily. [6] [11] The mission was cancelled in early 2017 and the spacecraft's propulsion segment became the Power and Propulsion Element (PPE) for the Deep Space Gateway, now known as the Gateway. [5]

Reusable Space Tug missions

During the Asteroid Redirect Mission, space tug missions were purposed to separate Mars logistics that can spend a longer time in space than the crew into a separate mission, which could have reduced the costs by as much as 60% (if using advanced solar electric propulsion (ion engines) [12] ). They would also reduce the overall mission risk by enabling check-out of critical systems at Mars before the crew departs Earth. This way if something goes wrong in those logistics, the crew is not in danger and the hardware can simply be fixed or relaunched. [13] [14] [15] [16] [17] [18]

Not only would the solar electric propulsion (SEP) technologies and designs be applied to future missions, but the ARM spacecraft would be left in a stable orbit for reuse. [13] [15] [14] The project had baselined any of multiple refueling capabilities. The asteroid-specific payload was at one end of the spacecraft bus, either for possible removal and replacement via future servicing, or as a separable, reusable spacecraft, leaving a qualified space tug in cislunar space. This made adaption for Gateway easy, as the propulsion system was already designed to be multi-mission reusable. [19] [20] [21] [22] [23] When the ARM was cancelled however, development on the bus and any reusable tug ideas died, temporarily. [5]

Power and Propulsion Element

A diagram of the Gateway identifying the Power and Propulsion Element, along with the other modules planned. NASA and ESA's Lunar Gateway.png
A diagram of the Gateway identifying the Power and Propulsion Element, along with the other modules planned.

In 2017, a year after the Artemis program came into existence, the ARM space tug/propulsion bus was dusted off and repurposed as the main propulsion system for the Gateway space station, and officially became known as the Power and Propulsion Element or PPE. [5] The PPE will be a smaller version of the Asteroid Redirect bus. [5] [24] In 2018, the Gateway was split off from Artemis as a separate program to allow a Moon landing by 2024 without having to wait for the Gateway to be completed. [25] [26]

Commercial company studies

On 1 November 2017, NASA commissioned 5 studies lasting four months into affordable ways to develop the Power and Propulsion Element (PPE), hopefully leveraging private companies' plans. These studies had a combined budget of US$2.4 million. The companies performing the PPE studies were Boeing, Lockheed Martin, Orbital ATK, Sierra Nevada and Space Systems/Loral. [27] [8] These awards are in addition to the ongoing set of NextSTEP-2 awards made in 2016 to study development and make ground prototypes of habitat modules that could be used on the Gateway as well as other commercial applications, [28] so the Gateway is likely to incorporate components developed under NextSTEP as well. [8] [29]

Contract awarded

In May 2019, Maxar Technologies was contracted by NASA to manufacture this module, which will also supply the station with electrical power and is based on Maxar's SSL 1300 series satellite bus. [30] The PPE will use Busek 6 kW Hall-effect thrusters and NASA Advanced Electric Propulsion System (AEPS) Hall-effect thrusters. [31] [32] [33] Maxar was awarded a firm-fixed price contract of US$375 million to build the PPE. Maxar's SSL business unit, previously known as Space Systems/Loral, will lead the project. Maxar stated they will receive help from Blue Origin and Draper Laboratory on the project, with Blue Origin assisting in human-rating and safety aspect while Draper will work with trajectory and navigation development. [7] NASA is supplying the PPE with a S-band communications system to provide a radio link with nearby vehicles and a passive docking adapter to receive the Gateway's future Utilization Module. [7] Maxar stated they are experienced dealing with high power components from making satellites. They did mention that their satellites are around 20 to 30 kilowatts, while the PPE will be about 60 kilowatts, but they say much of the technology they have already developed will still be applicable. [7] After a one-year demonstration period, NASA would then "exercise a contract option to take over control of the spacecraft". [26] Its expected service time is about 15 years. [25]

To be launched with HALO

As originally planned, PPE would be compatible with the International Docking System Standard (IDSS). [34] This meant that any IDSS capable spacecraft could theoretically dock to the PPE, such as Orion, the International Space Station, Dragon 2, Dream Chaser, and Boeing Starliner.

In 2020, NASA announced that the PPE would be integrated before launch with HALO, the renamed Utilization Module. [35] In February 2021 NASA contracted with SpaceX for launch of the integrated elements by a Falcon Heavy launch vehicle. [36]

In mid 2024, the HALO module reached significant completion and entered into the stress test phase in Thales Alenia's facilities. Upon successful completion of the stress tests, it is planned to be shipped to the US Northrop Grumman facilities to undergo final launch preparation and integration with the Power and Propulsion Element. [37]

PPE construction

See also

Related Research Articles

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Solar electric propulsion (SEP) refers to the combination of solar cells and electric thrusters to propel a spacecraft through outer space. This technology has been exploited in a variety of spacecraft designs by the European Space Agency (ESA), the JAXA, Indian Space Research Organisation (ISRO) and NASA. SEP has a significantly higher specific impulse than chemical rocket propulsion, thus requiring less propellant mass to be launched with a spacecraft. The technology has been evaluated for missions to Mars.

<span class="mw-page-title-main">Crew Exploration Vehicle</span> Planned orbiter component of NASAs cancelled Project Constellation; became Orion crew vehicle

The Crew Exploration Vehicle (CEV) was a component of the U.S. NASA Vision for Space Exploration plan. A competition was held to design a spacecraft that could carry humans to the destinations envisioned by the plan. The winning design was the Orion spacecraft.

The European System Providing Refueling Infrastructure and Telecommunications (ESPRIT) is an under construction module of the Lunar Gateway. It will provide refueling through additional xenon and hydrazine capacity for use in the Power and Propulsion Element's ion engines and hydrazine thrusters. It will also provide additional communications equipment, a habitation area, and storage. It will have a launch mass of approximately 10,000 kg (22,000 lb), a length of 6.4 m (21 ft), and a diameter of 4.6 m (15 ft). ESA awarded two parallel design studies for ESPRIT, one mostly led by Airbus in partnership with Comex and OHB and one led by Thales Alenia Space. The construction of the module was approved in November 2019. On 14 October 2020, Thales Alenia Space announced that they had been selected by ESA to build the ESPRIT module.

<span class="mw-page-title-main">Busek</span> American spacecraft propulsion company

Busek Company Incorporated is an American spacecraft propulsion company that builds thrusters, electronics, and various systems for spacecraft.

<span class="mw-page-title-main">Asteroid Redirect Mission</span> 2013–2017 proposed NASA space mission

The Asteroid Redirect Mission (ARM), also known as the Asteroid Retrieval and Utilization (ARU) mission and the Asteroid Initiative, was a space mission proposed by NASA in 2013; the mission was later cancelled. The Asteroid Retrieval Robotic Mission (ARRM) spacecraft would rendezvous with a large near-Earth asteroid and use robotic arms with anchoring grippers to retrieve a 4-meter boulder from the asteroid.

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The Near-Earth Asteroid Scout was a mission by NASA to develop a controllable low-cost CubeSat solar sail spacecraft capable of encountering near-Earth asteroids (NEA). NEA Scout was one of ten CubeSats launched into a heliocentric orbit on Artemis 1, the maiden flight of the Space Launch System, on 16 November 2022.

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<span class="mw-page-title-main">Lunar Gateway</span> Lunar orbital space station under development

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<span class="mw-page-title-main">Advanced Electric Propulsion System</span> Spacecraft propulsion system by NASA. 50kW Hall-effect thrusters, now for Lunar Gateway

Advanced Electric Propulsion System (AEPS) is a solar electric propulsion system for spacecraft that is being designed, developed and tested by NASA and Aerojet Rocketdyne for large-scale science missions and cargo transportation. The first application of the AEPS is to propel the Power and Propulsion Element (PPE) of the Lunar Gateway, to be launched no earlier than 2025. The PPE module is built by Maxar space solutions in Palo Alto, California. Two identical AEPS engines would consume 25 kW being generated by the roll-out solar array (ROSA) assembly, which can produce over 60 kW of power.

<span class="mw-page-title-main">Artemis program</span> NASA-led lunar exploration program

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<span class="mw-page-title-main">Artemis 4</span> Fourth orbital flight of the Artemis program

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<span class="mw-page-title-main">CAPSTONE</span> NASA satellite to test the Lunar Gateway orbit

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References

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  2. 1 2 "Artemis Programs: NASA Should Document and Communicate Plans to Address Gateway's Mass Risk". GAO . 31 July 2024. Retrieved 31 July 2024.
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  9. ↑ Chris Gebhardt (6 April 2017). "NASA finally sets goals, missions for SLS – eyes multi-step plan to Mars". NASASpaceFlight.com. Archived from the original on 21 August 2017. Retrieved 9 April 2017.
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  14. 1 2 Craig, D. (10 June 2015). Evolvable Mars Campaign.
  15. 1 2 Troutman, P. (30 July 2014). The Evolvable Mars Campaign: the Moons of Mars as a Destination.
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  17. ↑ McElratht, T.; Elliott, J. (January 2014). "There and Back again: Using planet-based SEP tugs to repeatably aid interplanetary payloads". Advances in the Astronautical Sciences (152): 2279–2298.
  18. ↑ Price, Humphrey W.; Woolley, Ryan; Strange, Nathan J.; Baker, John D. (2014). "Human Missions to Mars Orbit, Phobos, and Mars Surface Using 100-kWe-Class Solar Electric Propulsion". AIAA SPACE 2014 Conference and Exposition. doi:10.2514/6.2014-4436. ISBN   978-1-62410-257-8.
  19. ↑ Manzanek, D. (20 May 2016). The Asteroid Redirect Mission. USNO Scientific Colloquium.
  20. ↑ Gates, M.; Manzanek, D. (28 June 2016). Asteroid Redirect Mission (ARM). 15th Meeting of the NASA Small Bodies Assessment Group.
  21. ↑ Manzanek, D.; Reeves, D.; Hopkins, J.; Wade, D.; Tantardini M.; Shen, H. (13 April 2015). "Enhanced Gravity Tractor Technique for Planetary Defense". IAA-PDC.
  22. ↑ NASA RFI: Spacecraft Bus Concepts to Support the ARM and In-Space Robotic Servicing- Section "Separable Spacecraft Architecture ARRM Concept".
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  24. ↑ Foust, Jeff (30 March 2018). "NASA considers acquiring more than one gateway propulsion module". SpaceNews. Retrieved 11 December 2019.
  25. 1 2 Crusan, Jason (7 December 2018). "Gateway Update: NASA ADVISORY COUNCIL Human Exploration and Operations Committee" (PDF). Retrieved 12 November 2022.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  26. 1 2 NASA updates Lunar Gateway plans Archived 6 August 2019 at the Wayback Machine , Philip Sloss, NASASpaceFlight.com, 11 September 2018
  27. ↑ Jimi Russell (November 2017). "NASA Selects Studies for Gateway Power and Propulsion Element". nasa.gov. NASA. Archived from the original on 12 January 2018. Retrieved 2 November 2017.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  28. ↑ Robyn Gatens, Jason Crusan. "Cislunar Habitation and Environmental Control and Life Support System" (PDF). nasa.gov. NASA. Archived (PDF) from the original on 31 March 2017. Retrieved 31 March 2017.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  29. ↑ Erin Mahoney (9 August 2016). "NextSTEP Partners Develop Ground Prototypes to Expand our Knowledge of Deep Space Habitats". nasa.gov. NASA. Archived from the original on 10 April 2017. Retrieved 6 November 2017.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  30. ↑ "NASA Awards Artemis Contract for Lunar Gateway Power, Propulsion" (Press release). NASA. 23 May 2019. Archived from the original on 20 September 2019. Retrieved 11 December 2019.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  31. ↑ Foust, Jeff (23 May 2019). "NASA selects Maxar to build first Gateway element". SpaceNews. Retrieved 23 May 2019.
  32. ↑ Status of Advanced Electric Propulsion Systems for Exploration Missions Archived 13 June 2019 at the Wayback Machine R. Joseph Cassady, Sam Wiley, Jerry Jackson; Aerojet Rocketdyne, October 2018
  33. ↑ "Maxar and Busek Thruster System for NASA Lunar Gateway Passes Critical Milestone". www.prnewswire.com (Press release). Retrieved 28 April 2021.
  34. ↑ Robinson, Julie A. (11 October 2018). "Update on Gateway with Science and Technology (Utilization) Discussion" (PDF).
  35. ↑ Northrop Grumman outlines HALO plans for Gateway’s central module Aug 2020
  36. ↑ "NASA Awards Contract to Launch Initial Elements for Lunar Outpost". NASA. 9 February 2021.
  37. ↑ "Gateway's HALO Making Moves - NASA". 10 June 2024. Retrieved 18 June 2024.
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