MR-104
The MR-104 is an Aerojet/L3Harris hydrazine monopropellant reaction-control thruster family with heritage on NASA's Voyager 1 and 2 spacecraft and current crewed-Orion use through the MR-104G variant. NASA reports twelve MR-104G engines on Orion's crew module for reaction control; family-level thrust is left unspecified here because the documented derivatives are not interchangeable.
Identity
- Aliases
- Aerojet MR-104
- Domains
- spaceflight
- Identity Level
- family
- Kind
- chemical-thruster
- Name
- MR-104
- Status
- active
Details
- Description
- The MR-104 is an Aerojet/L3Harris hydrazine monopropellant reaction-control thruster family with heritage on NASA's Voyager 1 and 2 spacecraft and current crewed-Orion use through the MR-104G variant. NASA reports twelve MR-104G engines on Orion's crew module for reaction control; family-level thrust is left unspecified here because the documented derivatives are not interchangeable.
- Manufacturers
- Propellants
- hydrazine (N2H4)
Assets & Meta
- Creation Time
- August 15, 2026 at 05:14:14 UTC
- Updated Time
- August 15, 2026 at 05:14:14 UTC
Other
- Sources
- Accessed Date
- 2026-08-14
- Note
- NASA identifies twelve monopropellant MR-104G engines on Orion and explains that MR-104 thrusters were used on Voyager 1 and 2.
- Published Date
- 2022-12-09
- Publisher
- NASA
- Title
- Artemis I Flight Day 24: Orion Heads Home
- Accessed Date
- 2026-08-14
- Note
- NASA documents Orion crew-module RCS heritage thrusters as Aerojet MR-104 units using hydrazine monopropellant.
- Published Date
- 2008-10-01
- Publisher
- NASA
- Title
- NASA Propulsion Investments for the Constellation Program
- Accessed Date
- 2026-08-14
- Note
- Manufacturer mission material lists twelve MR-104 thrusters on the current Orion crew-module propulsion system.
- Published Date
- 2025-12
- Publisher
- L3Harris Technologies
- Title
- Our Role on Artemis II