// UE5 · NASA SPICE · 6DOF RCS

AstroProp

Orbital Proximity Simulation
mission_ctrl.exe
Get Launch Updates View Devlog
// live simulation preview
V-Bar Approach
Chaser Target Station Orbital Path
// core systems
Under the Hood
SYS-01 🛰️

NASA SPICE Integration

Real-world ephemeris data and J2000 orbital state vectors. Every maneuver is mathematically grounded in actual astrodynamics — no fake gravity shortcuts.

SYS-02 ⚙️

UE5 Large World Coords

64-bit double precision across the entire scene. Experience millimeter-perfect docking tolerances without floating-point drift breaking the sim.

SYS-03 🎮

6DoF RCS Control

Full six-degrees-of-freedom translation and rotation. Master the V-Bar approach where the orbital paradox holds: speeding up means slowing down.

SYS-04 📡

LVLH Reference Frame

All navigation displayed in the Local Vertical Local Horizontal frame — the same coordinate system used by actual spacecraft crews.

SYS-05 🌍

Orbital Mechanics Engine

Hohmann transfers, phasing burns, perturbation forces (J2 oblateness, atmospheric drag). The simulation that KSP only dreamed about.

SYS-06 🔭

Mission Scenarios

Historical ISS docking profiles, Gemini rendezvous, Apollo LM approaches — each recreated from mission archives and flight rules.

// development log
Roadmap
[ DONE ]

v0.1 — Concept & Research

Astrodynamics deep-dive, SPICE toolkit evaluation, UE5 LWC feasibility tests.

[ WIP ]

v0.2 — RCS Prototype

6DoF thruster model, physics integration, LVLH HUD overlay. Basic V-bar approach playable.

[ NEXT ]

v0.3 — SPICE Data Pipeline

Live kernel loading, state vector interpolation, real ISS orbital elements.

[ LATER ]

v1.0 — Steam Early Access

Full mission suite, tutorials, scenario editor, community leaderboards.

// launch comms
Stay on Comms

No spam. No filler. Just updates when something real ships — new build drops, Steam launch date, devlog posts.

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