{
  "schema_version": 1,
  "task": "jdp-tess-epoch-retry",
  "synthetic": true,
  "not_an_observation": true,
  "not_a_detection": true,
  "label": "Epoch measurements from a labelled synthetic TESS-like fixture. Not an observation and not a detection.",
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    "lightcurve": {
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      "sha256": "a524ef7f6dafddd840ff7aa028972f50157568c0e445c369aaca28b695b7f177",
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      "time_start_btjd": 3000.0,
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      "synthetic": true
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      "synthetic": true
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      "task": "jdp-tess-target-docket",
      "status": "OK",
      "linked_rows": 0,
      "link_note": "The light curve has no TIC column and the fit record marks it synthetic, so no target-list row is linked to it."
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  "counts": {
    "events_considered": 8,
    "events_measured": 8,
    "events_unconstrained": 0,
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  ],
  "refused_events": [],
  "linear_fit": {
    "n_epochs": 8,
    "status": "OK",
    "t0_btjd": 3014.600011277102,
    "period_days": 3.4999951991525995,
    "t0_uncertainty_days": 1.3300980273557104e-05,
    "period_uncertainty_days": 5.695735792937331e-06,
    "covariance": {
      "t0_t0": 1.7691607623755519e-10,
      "t0_period": 1.7672297390181987e-11,
      "period_period": 3.244140622294744e-11
    },
    "chi_square": 2.5609341027599295,
    "degrees_of_freedom": 6,
    "chi_square_per_dof": 0.42682235045998823,
    "scaling": 0.42682235045998823,
    "residuals_days": [
      2.2013998204784002e-05,
      -2.2728312615072355e-05,
      4.250965048413491e-06,
      -3.246138476242777e-06,
      2.6371148123871535e-05,
      -7.307150917768013e-05,
      2.9860496397304814e-05,
      1.191043565995642e-05
    ],
    "residuals_cycles": [
      -4,
      -3,
      -2,
      -1,
      0,
      1,
      2,
      3
    ],
    "note": "Consistency fit to per-transit times measured with the reference period fixed. It is not an independent period measurement."
  },
  "fixture_truth_check": {
    "cycle_shift": 4,
    "injected_t0_btjd": 3000.6,
    "shifted_measured_t0_btjd": 3000.6000304804916,
    "t0_offset_days": 3.0480491659545805e-05,
    "t0_pull": 1.1553778372147023,
    "injected_period_days": 3.5,
    "measured_period_days": 3.4999951991525995,
    "period_offset_days": -4.800847400510122e-06,
    "period_pull": -0.8428844972870997,
    "note": "The cycle number is relative to the reference ephemeris. Shifting by whole periods is a fixture check, not a physical epoch."
  },
  "software": {
    "python": "3.12.1",
    "numpy": "1.26.4",
    "scipy": "1.15.3",
    "tess_timing": "0.1.0"
  },
  "limits": [
    "The only committed multi-transit light curve is a synthetic TESS-like fixture. Every epoch here describes that fixture, not a star and not a TESS observation.",
    "No target-list row is linked to the light curve. The docket was read for provenance and counts only.",
    "The period, depth, duration, and ingress fraction are fixed at the committed reference fit. The per-transit times are conditional on that ephemeris and are not an independent period measurement.",
    "The local fit frees only the mid-transit offset and a local baseline. It does not include limb darkening, eccentricity, dilution, starspots, transit-timing variations, or correlated noise.",
    "The one-sigma uncertainties come from the least-squares covariance scaled by the reduced chi-square. They are not posterior samples and have not been calibrated by an injection-recovery campaign on this measurement path.",
    "The light curve covers about 27 days and eight transit events. It cannot constrain a long-term period trend or a transit timing variation.",
    "A linear fit to the measured epochs is a consistency check. Its residuals are not a detection of a timing variation.",
    "This sheet is not a detection, a discovery, a confirmation, or a claim about any target in the docket.",
    "No network request is made. The inputs are the committed local files named above, identified by SHA-256."
  ]
}