{
  "method": "Two-parameter attributable inversion. The middle-epoch spacecraft range and range-rate are fitted; position and velocity follow from the measured line-of-sight direction/rate and the JPL comet state. The spacecraft state is propagated with heliocentric two-body gravity and minimized against all sight lines.",
  "official_spacecraft_data_used_in_fit": false,
  "equal_cadence_assumption": true,
  "cadence_seconds": 547.885662317276,
  "observations": 57,
  "arc_hours": 8.522666104137897,
  "multistart_trials": 144,
  "plausible_bound_solutions": 144,
  "distinct_bound_solutions": 2,
  "near_optimal_within_astrometric_noise": 2,
  "distinct_bound_solution_summary": [
    {
      "comet_range_au": 0.6567960177571505,
      "comet_range_rate_au_per_day": -0.001647007486893207,
      "line_distance_rms_km": 47.76931016816472,
      "semimajor_axis_au": 0.2587767372856019,
      "eccentricity": 0.8076239154420676,
      "inclination_deg": 19.751428620464704
    },
    {
      "comet_range_au": 0.05000000000000001,
      "comet_range_rate_au_per_day": -0.005561834653292839,
      "line_distance_rms_km": 244.2281160220343,
      "semimajor_axis_au": 1.3721859268095058,
      "eccentricity": 0.7733316264411344,
      "inclination_deg": 136.8336806207994
    }
  ],
  "reference_epoch_utc": "2025-10-01T10:19:53.557487Z",
  "inferred": {
    "comet_range_au": 0.6567961568802018,
    "comet_range_rate_au_per_day": -0.001646994127020875,
    "line_distance_rms_km": 47.76931016494001,
    "angular_rms_arcsec": 0.10028404934569869,
    "state_vector_icrf_au_au_per_day": {
      "x": 0.379645127695974,
      "y": -0.06610670654819487,
      "z": 0.011471014302014637,
      "vx": -0.012322963983571644,
      "vy": 0.014938492067689543,
      "vz": 0.004072087709940806
    },
    "osculating_elements": {
      "semimajor_axis_au": 0.25877677302783675,
      "eccentricity": 0.8076236417477758,
      "perihelion_distance_au": 0.04978253319535764,
      "inclination_deg": 19.751451245492863,
      "ascending_node_deg": 345.36687349747365,
      "argument_perihelion_deg": 166.70750091418148,
      "true_anomaly_at_epoch_deg": 198.34365217802596,
      "orbit_type": "elliptic"
    }
  },
  "official_solar_orbiter": {
    "source": "JPL Horizons target -144, queried only after the inverse fit",
    "line_distance_rms_km": 23959.081956714806,
    "angular_rms_arcsec": 46.353451914793226,
    "state_vector_icrf_au_au_per_day": {
      "x": 0.427892328874003,
      "y": -0.05342767587547193,
      "z": 0.03369977473220932,
      "vx": 0.01452344228009466,
      "vy": 0.02031365204564987,
      "vz": 0.01578351228526485
    },
    "osculating_elements": {
      "semimajor_axis_au": 0.5970886485288834,
      "eccentricity": 0.507285190846503,
      "perihelion_distance_au": 0.29419441950762826,
      "inclination_deg": 34.25536593563303,
      "ascending_node_deg": 346.29315565228876,
      "argument_perihelion_deg": 280.80512926154086,
      "true_anomaly_at_epoch_deg": 87.15119784424967,
      "orbit_type": "elliptic"
    }
  },
  "comparison": {
    "position_difference_km_at_reference_epoch": 8170109.396267875,
    "velocity_difference_km_s_at_reference_epoch": 51.56077692125704,
    "semimajor_axis_difference_au": -0.3383118755010467,
    "eccentricity_difference": 0.30033845090127276,
    "inclination_difference_deg": -14.503914690140167
  },
  "limitations": [
    "The angular arc spans only 8.5 hours, so range and range-rate remain weakly constrained.",
    "The source-frame times were previously reconstructed by matching the comet track using Solar Orbiter as observer; the comparison is therefore not fully independent.",
    "The measured video positions are smooth sub-pixel centroids with an estimated external uncertainty near 46 arcsec.",
    "A first-order light-time correction propagates the comet to its estimated emission time for each trial spacecraft position.",
    "Solar radiation pressure, manoeuvres and planetary perturbations are omitted from the two-body model."
  ]
}