{
  "center_ra_dec_deg": [
    11.324519357175813,
    45.986949640547735
  ],
  "field_size_deg": [
    2.6657883852086695,
    2.108696385203762
  ],
  "original_pixel_scale_arcsec": 1.8569733333496925,
  "reference_matches": 60,
  "held_out_stars": 14,
  "validation": "held out from distortion fitting; may have participated in blind field identification",
  "source_sha256": "4d310725169622299ba56bc5a3ad6fdf166ace75119ab05a587b82858d4c494f",
  "source": "R4073.tif",
  "kind": "star field",
  "grouped_exposures": true,
  "reference_index": "index-4206-* (2MASS)",
  "identification_method": "Plate-label Kap20 position hint plus grouped exposure images",
  "distortion_models": [
    {
      "order": 1,
      "train_stars": 46,
      "median_original_pixels": 0.6369665154844101,
      "p90_original_pixels": 1.462929478945994
    },
    {
      "order": 2,
      "train_stars": 46,
      "median_original_pixels": 0.7120042201562409,
      "p90_original_pixels": 1.7999364822247141
    },
    {
      "order": 3,
      "train_stars": 46,
      "median_original_pixels": 0.5122797789368654,
      "p90_original_pixels": 1.7955151804714584
    }
  ],
  "selected_model": {
    "order": 3,
    "train_stars": 46,
    "median_original_pixels": 0.5122797789368654,
    "p90_original_pixels": 1.7955151804714584
  },
  "median_held_out_arcsec": 0.9512898887000345,
  "fit_validated": true,
  "inverse_sip_max_error_binned_pixels": 1.2020958875519618e-07,
  "center_hms_dms": "00h45m17.88464572s +45d59m13.01870597s",
  "caveat": "No catalogue proper-motion propagation to plate epoch; unsupported borders are extrapolations."
}