{
  "center_ra_dec_deg": [
    20.277838180954337,
    72.71947770624185
  ],
  "field_size_deg": [
    2.668202328503637,
    2.063286558107701
  ],
  "original_pixel_scale_arcsec": 1.8486390266768848,
  "reference_matches": 79,
  "held_out_stars": 17,
  "validation": "held out from distortion fitting; may have participated in blind field identification",
  "source_sha256": "f7d0a02721d1109665d90af66aa4002467a4a5269a6e97cf33d8d9188e20ecae",
  "source": "R4011.tif",
  "kind": "star field",
  "distortion_models": [
    {
      "order": 1,
      "train_stars": 60,
      "median_original_pixels": 0.660220711122572,
      "p90_original_pixels": 1.9293485903501266
    },
    {
      "order": 2,
      "train_stars": 60,
      "median_original_pixels": 0.8591323071840457,
      "p90_original_pixels": 1.7800393831318941
    },
    {
      "order": 3,
      "train_stars": 60,
      "median_original_pixels": 0.8282737208950586,
      "p90_original_pixels": 1.6808900097521002
    }
  ],
  "selected_model": {
    "order": 1,
    "train_stars": 60,
    "median_original_pixels": 0.660220711122572,
    "p90_original_pixels": 1.9293485903501266
  },
  "median_held_out_arcsec": 1.2205097728015522,
  "fit_validated": true,
  "inverse_sip_max_error_binned_pixels": null,
  "center_hms_dms": "01h21m06.68116343s +72d43m10.11974247s",
  "caveat": "No catalogue proper-motion propagation to plate epoch; unsupported borders are extrapolations."
}