{
 "objects": [
  {
   "id": "DWB111",
   "name": "Propeller Nebula",
   "messier": null,
   "designations": [
    "DWB111",
    "DWB 111",
    "Simeis 57",
    "Simeis57",
    "Sim 57"
   ],
   "ra": 304,
   "dec": 43.666667,
   "x": 0.4045028,
   "y": 0.6904617,
   "z": 0.5997,
   "type": "hii_region",
   "mag": null,
   "size_arcmin": 20,
   "surf_br": null,
   "difficulty": "dark",
   "capturable": true,
   "resolves_on": [
    "s30pro",
    "s50"
   ],
   "fits_fov": [
    "s30pro",
    "s50"
   ],
   "redshift": null,
   "curated": true
  }
 ],
 "count": 1,
 "metadata": {
  "source": "curation/extras.json — hand-entered, NOT derived from a pinned source",
  "note": "Real imaging targets no fetched catalog carries, usually because the catalog behind them was never published as a machine-readable table. Every value is hand-curated and every entry documents its own provenance; these are the least authoritative rows this repo emits and are kept in a separate file so consumers can weight them accordingly. Positions are J2000; unit-sphere x/y/z, resolves_on and fits_fov derived at bake like everywhere else.",
  "provenance": {
   "DWB111": {
    "position": "SIMBAD basic for ident 'DWB 111' (main_id DWB 111, otype HII). Low precision — the value is exactly 20h16m00s +43°40′00″ with no coo_bibcode, inherited from the 1969 DWB survey. Good to roughly an arcminute, no better.",
    "size_arcmin": "APPROXIMATE. Neither SIMBAD nor any pinned source carries a dimension for this object; 20′ is the long-axis extent the object presents in amateur narrowband imaging. Treat as a planning figure, not a measurement.",
    "designations": "'DWB 111' is the only catalogue identifier SIMBAD lists. 'Simeis 57' and 'Propeller Nebula' are in universal amateur use but are NOT SIMBAD identifiers — they exist only here, which is the entire reason this entry does.",
    "type": "SIMBAD otype HII."
   }
  },
  "date_parsed": "2026-08-05"
 }
}