{
 "source": "https://lweb.cfa.harvard.edu/~loeb/micheli.pdf",
 "location": "Micheli et al. 2018, Nature 559, 223-226, Extended Data Table 1 (Ground-based astrometry), PDF page 9",
 "caption_as_printed": "Ground-based astrometric positions obtained by our team, with associated 1σ errors, as used in our analysis. For observations with codes F51 or J04, we list the manual re-measurements and associated astrometric errors that we used here, rather than the values available from the Minor Planet Center.",
 "method": "Transcription of printed numbers from a table image, not digitisation of a plotted curve. The page was rendered at 200 and at 400 dots per inch and read by Tesseract OCR at each resolution; the two readings agree on every digit of all 53 rows, and every row was compared by eye with the rendered image.",
 "rounding": {
  "ra_seconds_of_time": 0.0005,
  "dec_arcseconds": 0.005,
  "date_days": 5e-07
 },
 "columns": [
  "date_utc",
  "ra_hms",
  "dec_dms",
  "sigma_ra_arcsec",
  "sigma_dec_arcsec",
  "mpc_code"
 ],
 "rows": [
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