Precise orbit determination
Process GNSS, Doppler, range, ISL and D-DOR observations with batch least-squares and Kalman filters, full uncertainty propagation and customisable parameters.
What NEMO does
The complete flight dynamics cycle, in one platform.
From mission design to in-flight operations, NEMO covers the work a flight dynamics team does every day, across LEO, GEO, cislunar and deep-space regimes.
High-fidelity dynamical models
N-body gravity, spherical harmonics, relativistic effects, atmospheric drag, solar radiation pressure, albedo, thermal recoil, and chemical and electric propulsion.
Conjunction assessment and collision avoidance
Continuous conjunction monitoring, collision risk analysis, and automated planning and optimisation of collision avoidance manoeuvres.
Orbit control and constellation maintenance
Station keeping, ground-track, phasing and LTAN control, and orbital slot management for constellations.
Trajectory design and optimisation
Trajectories that balance safety, propellant consumption and mission objectives.
Built to interoperate
Standard input and output formats including TLE, CCSDS (OEM, OPM, OMM, AEM), SPK, IPF and CPF, with interfaces to Earth orientation and space weather data files. Event computation for eclipses, occultations, visibility, conjunctions and custom events.
Orbit determination, in practice
From raw tracking data to a fitted orbit.
Residuals are the differences between the measurements and what the estimated orbit predicts. Before the fit, the tangential component drifts to hundreds of metres. After it, all three components sit around zero.
| RMS | Pre-fit | Post-fit |
|---|---|---|
| Radial | 7.05 m | 3.76 m |
| Tangential | 357.4 m | 2.70 m |
| Cross-track | 1.74 m | 1.67 m |
Architecture
One core. Four ways to use it.
NEMO adapts to your team. Plug it into your own toolchain, run it from a visual interface, or let it automate routine operations for you.
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CORE
The flight dynamics computation engine that powers every NEMO module.
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API
Operate NEMO and integrate it with your applications and existing workflows through an HTTP REST API.
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WEB
A web-based graphical interface that becomes your flight dynamics cockpit: data dashboards, trajectory visualisation, mission timelines, alert management, and configuration and execution of FLOW pipelines (when used with FLOW).
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FLOW
The automation and near-real-time processing layer that chains orbit determination, conjunction screening, manoeuvre optimisation and planning, reducing the operational load on your team.
FLOW
The power of FLOW.
When new tracking data arrives, FLOW runs the whole chain in near real time: orbit determination, conjunction screening, manoeuvre optimisation and planning, with no manual hand-off between steps.
- 01Tracking data
- 02Orbit determination
- 03Conjunction screening
- 04Manoeuvre optimisation
- 05Planning
Products and licensing
From mission design to flight operations.
NEMO Design for the design phase, NEMO Operations for live missions. Every Operations tier includes the full platform: they differ only in how your team works with it.
Design phase
NEMO Design
Mission design and analysis
Base
Integrate into your toolchainCORE + APIPlus
Operate from the cockpitCORE + API + WEBFull
Automate routine operationsCORE + API + WEB + FLOWCapabilities
Mission analysis and simulation: dynamical models, trajectory optimisation, manoeuvre planning, Monte Carlo, orbit determination simulations
On top of Design:Operational orbit determination, conjunction assessment and collision avoidance, ephemeris export
On top of Base:The WEB cockpit: dashboards, trajectory visualisation, mission timelines, alerts
On top of Plus:FLOW: automated, near-real-time routine operations
Licensing
Annual/User
Annual/Company
Annual/Company
Annual/Company
Deployment
Cloud
SaaS/On-premise
SaaS/On-premise
SaaS/On-premise
Best for
Design-phase studies and mission analysis
Technically autonomous teams that plug NEMO into their own toolchain
Operations teams that want direct access without custom integration
High-cadence operators, large constellations, automation-focused teams
More missions.
Same licence.
NEMO Operations is licensed per company, not per mission or per user. Adding a mission doesn't add a fee: pricing follows your fleet size, and the cost per satellite goes down as you grow.
Request your quote
Experience and support
Software built by people who fly real missions.
NEMO grows out of the Nautilus team's operational flight dynamics experience, with NASA and ESA mission heritage and a flight-validated operational pipeline.
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01
Technical onboarding
Setup, pipeline integration and data transfer.
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02
Mission configuration
Satellite parameters, orbit determination setup and mission pipeline.
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03
FDS & OPS training
Flight dynamics software and operations training: a structured programme for your team, from the API to FLOW.
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04
Special operations support
Priority access during critical phases:
- Launch and early orbit phase (LEOP)
- Collision avoidance events
- Rendezvous and proximity operations
- De-orbiting
- Anomaly response
Get a quote tailored to your fleet.
NEMO Operations is licensed per company and priced on your fleet size. Tell us what you fly, or see NEMO at work on a mission like yours.
Need full operational support as well?
Nautilus also provides mission analysis and operational navigation, from early design to real-time operations.