{"artifact_id":"L1-454","layer":"L1","title":"Spacecraft Attitude Determination","domain":"Robotics","sub_domain":"Spacecraft dynamics","physics_fingerprint":{"L_DAG":3.0,"title":"Spacecraft Attitude Determination","domain":"Robotics","carrier":"N/A","primitives":["S.quest.quaternion_estimator","D.time","O.ekf.attitude_ekf"],"sub_domain":"Spacecraft dynamics","noise_model":"gaussian","problem_class":"parameter_estimation","solution_space":"quaternion_attitude","difficulty_delta":3,"integration_axis":"time","sensing_mechanism":"star_tracker_magnetometer_attitude"},"observable_profile":{"metric":"attitude_error_arcsec","regime":"Existence of the recovered quaternion_attitude is guaranteed within the declared Omega bounds. Uniqueness holds on the measurement-supported subspace; out-of-support modes are controlled by declared priors. Stability is conditionally stable (kappa_eff ~= 20); gyro_bias_estimation_error dominates the stability cliff; the remaining mismatch parameters contribute higher-order bias terms. Gaussian sets the irreducible data-fidelity floor.","secondary":"gyro_bias_estimation_error_deg_hr"},"size_tiers":{"center_spec":{"omega":{"update_rate_Hz":10,"N_stars_tracked":10,"gyro_noise_deg_hr":0.01,"star_tracker_noise_arcsec":2.0},"input_format":"measurement_only","problem_class":"parameter_estimation","forward_operator":"star_tracker_magnetometer_attitude","epsilon_fn_center":"3.0 attitude_error_arcsec"},"omega_bounds":{"update_rate_Hz":[0.1,100],"N_stars_tracked":[3,50],"gyro_noise_deg_hr":[0.001,1.0],"star_tracker_noise_arcsec":[0.5,30.0]},"epsilon_bounds":{"attitude_error_arcsec":[0.1,60.0]},"allowed_problem_classes":["parameter_estimation"],"allowed_omega_dimensions":["N_stars_tracked","gyro_noise_deg_hr","star_tracker_noise_arcsec","update_rate_Hz"],"allowed_forward_operators":["star_tracker_magnetometer_attitude"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"kappa":500,"metric":"attitude_error_arcsec"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0xfd81afc26fbdf7c38a0f782e8ea081d453eb660d3302cd94e780cbc8cba7bdfb","chain_tx_hash":"0xcb45855bac3df78f636be77bbe6b5acb248689909dc32403b8f2683e2b78b281","chain_block":41555278}