European Service Module

Last updated
European Service Module
Orion European Service Module Flight Model-1 logo.jpg
ESM logo showing the Orion spacecraft exploring the Solar System, with the rear view highlighting the service module
Manufacturer European Space Agency
Used on Orion
General characteristics
Height4 m (13 ft) [1]
Diameter4.1 m (13 ft) (excluding solar panels)
Gross mass13,500 kg (29,800 lb) [2]
Propellant mass8,600 kg (19,000 lb) [2] [3]
Derived from Automated Transfer Vehicle
Launch history
StatusOperational
First flightNovember 16, 2022
European SM
Powered by1 AJ10
Maximum thrust26.6 kN (6,000 lbf)
Propellant MON3/MMH

The European Service Module (ESM) is the service module component of the Orion spacecraft, serving as its primary power and propulsion component until it is discarded at the end of each mission. In January 2013, NASA announced that the European Space Agency (ESA) will contribute the service module for Artemis 1, based on the ESA's Automated Transfer Vehicle (ATV). It was delivered by Airbus Defence and Space in Bremen, in northern Germany to NASA at the end of 2018. After approval of the first module, the ESA will provide the ESMs from Artemis 2 to Artemis 6.

Contents

The module's first flight was Artemis 1, the first major milestone in NASA's Artemis program to return humans to the Moon, on November 16, 2022. The Space Launch System launched Orion toward the Moon, where the ESM placed the spacecraft into distant retrograde orbit around the Moon, and subsequently extracted it from that orbit and sent it back to Earth.

The service module (SM) supports the crew module (CM) from launch through separation prior to reentry. It provides in-space propulsion capability for orbital transfer, attitude control, and high altitude ascent aborts. It provides the water and oxygen needed for a habitable environment, generates and stores electrical power, and maintains the temperature of the vehicle's systems and components. This module can also transport unpressurized cargo and scientific payloads. [4]

History

Initial design

Pre-ATV service module design Orion SM.jpg
Pre-ATV service module design
Artist's conception of the Orion Spacecraft in lunar orbit with decagonal solar panels (concept from 2006) Orion lunar orbit (Sept 2006).jpg
Artist's conception of the Orion Spacecraft in lunar orbit with decagonal solar panels (concept from 2006)

Roughly cylindrical in shape, the original American-designed Orion SM, like the CM, would have been constructed of Al-Li alloy (to keep weight down), and would have featured a pair of deployable decagonal solar panels, similar in design to the panels used on the Mars Phoenix lander. The panels, the first to be used on a U.S. crewed spacecraft (except for a 10-year period, the Soviet/Russian Soyuz spacecraft has used them since the first mission in 1967), would allow NASA to eliminate the need to carry malfunction-prone fuel cells, and their associated hardware (mainly liquid H2 tanks) in the SM, resulting in a shorter and more maneuverable spacecraft. Successful initial testing of an Orion solar array design using full-scale "UltraFlex wing" hardware was reported in October 2008. [5]

The Orion Main Engine (OME) was a 33-kilonewton (7,500 lbf) thrust, pressure-fed, regeneratively cooled, storable bi-propellant rocket engine to be made by Aerojet. The OME was an increased performance version of the 27-kilonewton (6,000 lbf) thrust rocket engine used by the Space Shuttle for its Orbital Maneuvering System. The SM Reaction Control System (RCS), the spacecraft's maneuvering thrusters (originally based on the Apollo "quad" system, but resembling that used on its predecessor, Gemini), would also be pressure-fed, and would use the same propellants. NASA believed the SM RCS would be able to act as a backup for a trans-Earth injection burn in case the main SM engine failed.

A pair of liquid oxygen tanks (similar to those used in the Apollo service module) would provide, along with small tanks of nitrogen, the crew with breathing air at sea-level or "cruising altitude" pressure (1 or 0.7 atm), with a small "surge tank" providing necessary life support during reentry and touchdown. Lithium hydroxide (LiOH) cartridges would recycle the spacecraft's environmental system by "scrubbing" the carbon dioxide (CO2) exhaled by the astronauts from ship's air and adding fresh oxygen and nitrogen, which was then cycled back out into the system loop. Because of the switch from fuel cells to solar panels, the service module would have an onboard water tank to provide drinking water for the crew, and (when mixed with glycol), cooling water for the spacecraft's electronics. Unlike the practice during Apollo of dumping both water and urine overboard during the flight, the Orion would have an onboard recycling system, identical to that used on the International Space Station, to convert both waste water and urine into both drinking and cooling water.

The service module also mounted the spacecraft's waste heat management system (its radiators) and the aforementioned solar panels. These panels, along with backup batteries located in the Orion CM, would provide in-flight power to the ship's systems. The voltage, 28 volts DC, was similar to that used on the Apollo spacecraft during flight.

The Orion SM would be encapsulated by fiberglass shrouds jettisoned at the same time as the LES/Boost Protective Cover, which would take place roughly 21⁄2 minutes after launch (30 seconds after the solid rocket first stage was jettisoned). Prior to the "Orion 606" redesign, the Orion SM resembled a squat, enlarged version of the Apollo service module. The "Orion 606" SM design retained the 5-meter (16 ft) width for the attachments of the Orion SM with the Orion CM, but used a Soyuz-like service module design to allow Lockheed Martin to make the vehicle lighter in weight and permitting the attachment of the decagonal solar panels at the module's midpoints, instead of at the base near the spacecraft/rocket adapter, which might have subjected the panels to damage.

The Orion service module (SM) was projected comprising a cylindrical shape, having a diameter of 5 m (16 ft) and an overall length (including thruster) of 4.78 m (15 ft 8 in). The projected empty mass was 3,600 kg (8,000 lb), fuel capacity was 8,200 kg (18,000 lb). [6] [7]

ATV-based module

Edoardo Amaldi ATV approaching the International Space Station in 2012 ATV-3 approaches the International Space Station 1 cropped.jpg
Edoardo Amaldi ATV approaching the International Space Station in 2012

A review of the Constellation program in 2009 by the new Augustine Commission prompted by the then new Obama administration had found that five years in, the service module development program was already running four years behind its 2020 lunar target and was woefully underfunded. The only element worth continuing was the Crew Exploration Vehicle in the role of a space station escape capsule. [8] This led in 2010 to the Administration cancelling the program by withdrawing funding in the proposed 2011 budget. A public outcry led to the program being frozen rather than outright cancelled and a review launched in to how costs could be cut, which found that it was possible to continue if there was an emphasis on finding alternate funding, reducing the complexity by narrowing the scope to focus on the Moon and deep space rather than Mars, and by reusing existing hardware, reducing the range of equipment requiring development. The Ares I launcher intended for crew flights had significant design issues such as being overweight and prone to dangerous vibration, and in the case of a catastrophic failure its blast radius exceeded the escape system's ejection range.[ citation needed ] Its role as the Orion launch vehicle was replaced by the Space Launch System, and the three different Crew Exploration Vehicle designs were merged in to a single Multipurpose Crew Exploration Vehicle.

In May 2011, the European Space Agency's (ESA) director general announced a possible collaboration with NASA to work on a successor to ESA's Automated Transfer Vehicle (ATV). [9] ESA's provision of this successor could be counted towards its 8% share of the operating costs of the International Space Station (ISS); the ATV missions resupplying the station only covered this obligation up to 2017. On 21 June 2012, Astrium announced that it had been awarded two separate studies to evaluate possible future missions building on the technology and experience gained from its development of ATV and the Columbus laboratory. The first study looked into the construction of a service module which would be used in tandem with the Orion capsule. [10] The second examined the production of a versatile multi-purpose orbital vehicle. Each study was worth €6.5 million. [11]

In November 2012, ESA obtained the commitment of its member states for it to construct an ATV-derived service module for Orion, to fly on the maiden flight of the Space Launch System, thereby meeting ESA's budgetary obligation to NASA regarding the ISS for 2017–2020. [12] No decision was made about supplying the module for later Orion flights. [13]

In January 2013, NASA announced its agreement, made the preceding December, that ESA would build the service module for Exploration Mission-1 (renamed Artemis 1), then scheduled to take place in 2017. This service module was not required for Exploration Flight Test-1 in 2014, as this used a test service module supplied by Lockheed Martin. [14] On 17 November 2014 ESA signed a €390 million fixed price contract with Airbus Defence and Space for the development and construction of the first ATV-based service module. [15] In December 2016, ESA's member states agreed it would extend its commitment to the ISS to 2024, and would supply a second service module, as part of the resulting budgetary obligation. [16]

NASA's Orion spacecraft will carry astronauts further into space than ever before using a service module based on Europe's Automated Transfer Vehicles (ATV). November 2015 Orion with ATV SM.jpg
NASA’s Orion spacecraft will carry astronauts further into space than ever before using a service module based on Europe’s Automated Transfer Vehicles (ATV). November 2015

The new design [17] is approximately 5.0 meters (16.5 ft) in diameter and 4.0 meters (13 ft) in length, and made of aluminium-lithium alloy. [18]

The new design for the solar arrays, replacing ATK's decagonal (labeled "circular") UltraFlex design, [19] is by Airbus Defence and Space, [18] whose subsidiary, Airbus Defence and Space Netherlands (then known as Dutch Space), built the ATV's X-shaped array of four panels. The ATV's array was expected to generate 4.6 kilowatts. The upgraded version for the service module will generate about 11 kilowatts, [19] and will span about 19 m (62 ft) when extended. [18]

Service module shown with the crew module, adapters, and fairing panels Orion Service Module elements 2015.jpg
Service module shown with the crew module, adapters, and fairing panels

In September 2015, Thales Alenia Space signed a contract with Airbus Defence and Space to develop and produce thermomechanical systems for the service module, including structure and micrometeoroid protection, thermal control and consumable storage and distribution. [20]

Lockheed Martin is building the two adapters, connecting the service module to the crew module and to the upper stage of the Space Launch System, and also the three fairing panels that are jettisoned after protecting the service module during launch and ascent. [18]

On 16 February 2017 a €200m contract was signed between Airbus and the European Space Agency for the production of a second European service module for use on the first crewed Orion flight. [21]

From 2018

On 26 October 2018 the first unit for Artemis 1 was assembled in full at Airbus Defence and Space's factory in Bremen. [22]

The service module's main engine for Artemis 1 was a Space Shuttle Orbital Maneuvering System (OMS) AJ10-190 engine left over from the Space Shuttle program, [17] in which it flew on 19 missions and carried out 89 burns. [18] It is intended that the OMS will be used for the first three (or five [23] ) service modules and four alternate engine designs are under consideration for later flights, thought to include the AJ10-118k; used for the second stage of the Delta II it is a lighter and more powerful version in the same AJ10 engine family whose lineage began with the Vanguard. [24]

In comparison with the Apollo command and service module, which previously took astronauts to the Moon, the European Service Module (ESM) generates approximately twice as much electricity (11.2 kW vs 6.3 kW), weighs nearly 40% less when fully fueled (15,461 kg, [25] vs 24,520 kg) and is roughly the same size (4 m in length excluding engine [26] and 4.1 m vs 3.9 m in diameter) supporting the environment for a slightly (45%) larger habitable volume on the crew module (8.95 m3 vs 6.17 m3) though it will carry 50% less propellant for orbital maneuvers (8,600 kg usable propellant vs 18,584 kg).

The European Service Module for Artemis 1 undergoing acoustic testing in May 2019 ORION ESM ACOUSTIC TESTING.jpg
The European Service Module for Artemis 1 undergoing acoustic testing in May 2019

The ESM will be able to support a crew of four for 21 days which exceeds the 14 day endurance for the three-man Apollo.

In November 2019, ESA member states approved the financing of ESMs for Artemis 3 and 4. [27] In May 2020 the contract between Airbus and the European Space Agency for the production of a third European Service Module was signed. [28]

In October 2020, ESA and NASA sign a memorandum of understanding which includes the provision by ESA of ESM-4 and ESM-5 as a participation in the Gateway space station, allowing three flights of European astronauts to Lunar orbit between 2025 and 2030. [29]

In February 2021, the contract between Airbus and the European Space Agency to provide ESM-4 to ESM-6 was signed. [30]

Specifications

Dimensions4 m long

diameters: 4.1 m excluding solar panels, 5.2 m stowed, 19 m with solar panels unfurled [2]

Primary engine1 Space Shuttle Orbital Maneuvering System providing 26.6 kN of thrust for ESM-1 to ESM-6 [2]

1 New Aerojet Orion Main Engine (OME) from ESM-7 [31]

Secondary engine8 x 490 N Aerojet R-4D-11 Auxiliary Thrusters providing 3.92 kN of thrust [2]
Maneuvering thrusters24 x 220 N thrust Airbus Reaction Control System Engines in six pods of four [2]
Propellant capacity9,000 kg [1] propellant in four 2000 L propellant tanks, 2 mixed oxides of nitrogen (MON) and 2 monomethyl hydrazine (MMH). The usable propellant load is 8,600 kg [2] [3]
Power generation11.2 kW from 4 x 7.375 m wings each containing 3 solar panels [1]
Total launch mass13,500 kg for Lunar Mission, including 240 kg of water in four tanks, 90 kg of oxygen in three tanks, 30 kg of nitrogen in one tank, 8,600 kg of usable propellant [2]
PayloadPayload mass up to 380 kg and a payload volume of up to 0.57 cubic meters [3]
Materials Aluminum alloy (structure), stainless steel, Titanium (tank material), Kapton (insulation),

and copper (electrical and mechanical components). [32]

European Service Module models

ModelMissionNameStatusFramework
STAStructural Test ArticleUsed for Structural tests in Plum Brook Station, Ohio.
PQMPropulsion Qualification ModelUsed for propulsion testing in White Sands, New Mexico.
ESM-1 Artemis 1 BremenMission complete, launched November 16, 2022ISS barter
ESM-2 Artemis 2 In NASA KSC (O&C).ISS barter
ESM-3 Artemis 3 Integration in Airbus Bremen.

Schipment to KSC, planned for Summer 2024. [33]

ISS barter
ESM-4 Artemis 4 Integration in Airbus Bremen.Gateway
ESM-5 Artemis 5 Integration in Airbus Bremen.Gateway
ESM-6 Artemis 6 Integration in Airbus Bremen.ISS barter
ESM-7 to 9Artemis 7 to 9In negotiation between ESA and Airbus.ISS barter

Related Research Articles

Human spaceflight programs have been conducted, started, or planned by multiple countries and companies. Until the 21st century, human spaceflight programs were sponsored exclusively by governments, through either the military or civilian space agencies. With the launch of the privately funded SpaceShipOne in 2004, a new category of human spaceflight programs – commercial human spaceflight – arrived. By the end of 2022, three countries and one private company (SpaceX) had successfully launched humans to Earth orbit, and two private companies had launched humans on a suborbital trajectory.

<span class="mw-page-title-main">Automated Transfer Vehicle</span> Uncrewed cargo spacecraft developed by the European Space Agency

The Automated Transfer Vehicle, originally Ariane Transfer Vehicle or ATV, was an expendable cargo spacecraft developed by the European Space Agency (ESA), used for space cargo transport in 2008–2015. The ATV design was launched to orbit five times, exclusively by the Ariane 5 heavy-lift launch vehicle. It effectively was a larger European counterpart to the Russian Progress cargo spacecraft for carrying upmass to a single destination—the International Space Station (ISS)—but with three times the capacity.

<span class="mw-page-title-main">Constellation program</span> Cancelled 2005–2010 NASA human spaceflight program

The Constellation program was a crewed spaceflight program developed by NASA, the space agency of the United States, from 2005 to 2009. The major goals of the program were "completion of the International Space Station" and a "return to the Moon no later than 2020" with a crewed flight to the planet Mars as the ultimate goal. The program's logo reflected the three stages of the program: the Earth (ISS), the Moon, and finally Mars—while the Mars goal also found expression in the name given to the program's booster rockets: Ares. The technological aims of the program included the regaining of significant astronaut experience beyond low Earth orbit and the development of technologies necessary to enable sustained human presence on other planetary bodies.

A service module is a component of a crewed space capsule containing a variety of support systems used for spacecraft operations. Usually located in the uninhabited area of the spacecraft, the service module serves a storehouse of critical subsystems and supplies for the mission such as electrical systems, environmental control, and propellant tanks. The service module is jettisoned upon the completion of the mission, and usually burns up during atmospheric reentry.

<span class="mw-page-title-main">Exploration Systems Architecture Study</span> NASA study

The Exploration Systems Architecture Study (ESAS) is the official title of a large-scale, system level study released by the National Aeronautics and Space Administration (NASA) in November 2005 of his goal of returning astronauts to the Moon and eventually Mars—known as the Vision for Space Exploration. The Constellation Program was cancelled in 2010 by the Obama Administration and replaced with the Space Launch System, later renamed as the Artemis Program in 2017 under the Trump Administration.

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<span class="mw-page-title-main">NASA</span> American space and aeronautics agency

The National Aeronautics and Space Administration is an independent agency of the U.S. federal government responsible for the civil space program, aeronautics research, and space research. Established in 1958, it succeeded the National Advisory Committee for Aeronautics (NACA) to give the U.S. space development effort a distinct civilian orientation, emphasizing peaceful applications in space science. It has since led most of America's space exploration programs, including Project Mercury, Project Gemini, the 1968–1972 Apollo Moon landing missions, the Skylab space station, and the Space Shuttle. Currently, NASA supports the International Space Station (ISS) along with the Commercial Crew Program, and oversees the development of the Orion spacecraft and the Space Launch System for the lunar Artemis program.

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<span class="mw-page-title-main">Orion (spacecraft)</span> American–European spacecraft class for the Artemis program

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<span class="mw-page-title-main">Artemis 1</span> 2022 uncrewed Moon-orbiting NASA mission

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

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References

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  18. 1 2 3 4 5 Garcia, Mark (17 June 2015). "NASA Gears Up to Test Orion's Powerhouse". NASA. Retrieved 28 July 2015.
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  21. ↑ ""Airbus Defence and Space Wins 100 Million Euros ESA Contract for Second Service Module for NASA's Orion Crewed Space Capsule" Feb 2017". Archived from the original on 2017-04-19. Retrieved 2017-04-18.
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  26. ↑ Apollo Operators Handbook Block II Spacecraft (PDF). Vol. 1. NASA. 15 April 1969. p. 60.
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  28. ↑ "European contract signed for Moon mission hardware". BBC News . 26 May 2020. Archived from the original on 2022-12-16.
  29. ↑ "NASA, European Space Agency Formalize Artemis Gateway Partnership – NASA" . Retrieved 2024-05-15.
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  32. ↑ "Tanks for Orion flight model no. 2 delivered".
  33. ↑ "One step closer to the moon". Airbus Defence & Space - LinkedIn page. Airbus Defence & Space. 2024-05-07. Retrieved 2024-05-07.
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