Mars Observer four 490 N MMH/NTO main engines
Mars Observer used four 490 N pressure-fed bipropellant engines using monomethylhydrazine fuel and nitrogen tetroxide oxidizer for trajectory-correction maneuvers, Mars orbit insertion, and large spacecraft velocity changes. The four engines were arranged in redundant pairs.
Identity
- Aliases
- Mars Observer 490 N bipropellant enginesMars Observer main propulsion enginesMars Observer MMH/NTO main engines
- Domains
- spaceflight
- Identity Level
- integrated-system
- Kind
- liquid-rocket-engine
- Name
- Mars Observer four 490 N MMH/NTO main engines
- Status
- historical
Details
- Description
- Mars Observer used four 490 N pressure-fed bipropellant engines using monomethylhydrazine fuel and nitrogen tetroxide oxidizer for trajectory-correction maneuvers, Mars orbit insertion, and large spacecraft velocity changes. The four engines were arranged in redundant pairs.
- Propellants
- monomethylhydrazinenitrogen tetroxide
Links
Assets & Meta
- Creation Time
- September 8, 2026 at 09:43:38 UTC
- Updated Time
- September 8, 2026 at 09:43:38 UTC
Other
- Search Name
- Mars Observer four 490 N MMH/NTO main engines Mars Observer 490 N bipropellant engines Mars Observer main propulsion engines Mars Observer MMH/NTO main engines
- Sources
- Accessed Date
- 2026-09-08
- Note
- NASA spacecraft-propulsion overview identifies four 490 N Mars Observer bipropellant engines using MMH/NTO for trajectory control maneuvers and orbit insertion.
- Publisher
- NASA Technical Reports Server
- Title
- Satellite/spacecraft propulsion
- Accessed Date
- 2026-09-08
- Note
- JPL identifies Mars Observer as a past Mars orbiter whose mission ended before planned Mars orbit insertion.
- Publisher
- NASA Jet Propulsion Laboratory
- Title
- Mars Observer