{ "initialJulianDate": initial TDB Julian Date in days, "offsetJulianDate": offset TDB Julian Date in days, "timeScale": speed factor for the simulation time, "celestialBodies": [{ "id": PlanetID enum, "bodyType": BodyType enum, "rotationICRFtoTIRF": quaternion specifying the rotation from ICRF to body fixed rotating coordinates, "rotationTIRFtoICRF": quaternion specifying the rotation from body fixed rotating coordinates to ICRF, "radius": radius in meters "gm": gravitational parameter in SI units "flattening": flattening of the planet ellipsoid "name": name of the celestial body "solarBarycentricPosition": solar barycentric position vector in ICRF frame in meters, "solarBarycentricVelocity": solar barycentric velocity vector in ICRF frame in meters/second, } ], "propagatedBodies": [{ "id": automatically assigned id, "bodyType": BodyType enum, "orbitalElements": { osculating orbital elements referred to the central body of this propagated body "specificAngularMomentum": specific angular momentum in m^2/s, "specificEnergy": specific mechanical energy in m^2/s^2, "inclination": inclination in radians, "semiLatusRectum": semi latus rectum in meters, "eccentricity": eccentricity, "semiMinorAxis": semi-minor axis in meters, "semiMajorAxis": semi-major axis in meters, "apoapsis": apoapsis distance in meters, "periapsis": periapsis distance in meters, "orbitalPeriod": orbital period in seconds, "ascendingNodeLongitude": longitude of ascending node in radians, "periapsisArgument": argument of periapsis in radians, "trueAnomaly": True anomaly in radians, "orbitNormal": normal vector of the orbital plane, "ascendingNodeDirection": ascending node vector, "periapsisDirection": periapsis vector, "latusRectumDirection": latus rectum vector }, "orbitalPeriod": orbital period in seconds, "localPosition": position in local inertial coordinates of the central body, GCRF in Earth's case, "stateCovariance": Cartesian state (position, velocity) covariance matrix. Currently isn't propagated, so just a constant matrix, "localVelocity": velocity in local inertial coordinates of the central body, GCRF in Earth's case, "attitudeState": { variables describing the attitude state "attitude": attitude quaternion with respect to the inertial axes (ICRF), "attitudeCovariance": attitude covariance matrix, currently just a constant matrix, "maxAngularSpeed": max angular speed constraint for automatic pointing, "maxAngularAcceleration": max angular acceleration constraint for automatic pointing, "angularAcceleration": current angular acceleration, "angularSpeed": current angular speed }, "spacecraftData": { descriptions of various spacecraft components "structure": [ descriptions of structural spacecraft elements { "name": name of the structural part, "id": automatically assigned id, "parentID": id of the parent part, "localPosition": position vector w.r.t. the parent part, "localRotation": rotation vector w.r.t. the parent part, direction - axis of rotation, magnitude - rotation angle in radians "size": size specified as vector of three dimensions in meters, "mass": mass of the structural part, "modelPrefabName": name of a premade part model, "customModelGlb": path to custom part model in .glb format } ], "solarPanels": [ descriptions of solar panels { "structureId": automatically assigned id, "powerEfficiency": power efficiency of the solar panel, "area": area of the panel in m^2, "maxPower": maximum power output of the panel in Watts, "lightAmmountReceived": light amount received by the panel in Watts, "powerGenerated": power output in Watts } ], "batteries": [ descriptions of batteries { "structureId": automatically assigned id, "chargerEfficiency": charger efficiency as a decimal between 0 and 1, "capacityWattHours": battery capacity in WattHours, "chargeWattHours": charge level in WattHours, "chargeFloat": charge as a decimal fraction between 0 and 1 } ], "sensors": [ descriptions of sensors { "FoV": [horizontal field of view in degrees, vertical field of view in degrees], "PixelDimensions": [horizontal dimension number of pixels, vertical dimension number of pixels], "range": range of the sensor in meters, "orientation": orientation quaternion with respect to propagated body frame, "sensorType": SensorType enum, "Ranges": [range to each visible target in meters], "RangeUncertainty": range uncertainty as a variance value in m^2, currently just a constant number, "LinesOfSight": [line of sight vectors to each visible target], "AngleMeasurements": [angle coordinates to each visible target in radians], "AngleUncertainties": [two uncertainty values for each angle measurement, currently just constant numbers], "PixelCoordinates": [pixel coordinate pair for each visible target in frame] } ], "PowerConsumption": mean power consumption of the spacecraft in Watts }, "customModelPath": path to custom model in .glb format, "centralBody": PlanetID enum, "pointingMode": PointingMode enum, "pointingTarget": if CustomTarget is specified as pointingMode, this field specifies the id of the target station, "CustomPointingQuaternion": quaternion specifying the target attitude w.r.t. inertial axes (ICRF), "maneuvers": [list of scheduled maneuvers], "rigidBodyAttached": bool to toggle rigid body component, which propagates attitude dynamics, handles collisions and multi-body dynamics, "name": name of this propagated body, "solarBarycentricPosition": solar barycentric position vector in ICRF frame in meters, "solarBarycentricVelocity": solar barycentric velocity vector in ICRF frame in meters/second, "mass": mass of this propagated body } ], "groundStations": [{ "bodyType": BodyType enum, "enabled": toggle to enable/disable this ground station, "name": name of the ground station, "id": automatically assigned id of the ground station, "planet_id": PlanetID enum, "localPositionTIRF": position in local rotating frame, in Earth's case that's ITRF, in meters, "localPositionECI": position in local inertial frame, in Earth's case that's GCRF, in meters, "solarBarycentricPosition": solar barycentric position vector in ICRF frame in meters, "localPlanetSurfaceNormal": planet surface normal vector at ground station location in local rotating frame, ITRF in Earth's case, "globalPlanetSurfaceNormal": planet surface normal vector at ground station location in global inertial frame ICRF } ] }