{
  "_meta": {
    "name": "p13",
    "photo": "13.480859565_17934474635991868_323320248088719839_n.jpg",
    "anchored": "2026-05-13",
    "method": "warm-index column-sum + saturated-core centroid; visual confirmation against crosshair crops",
    "supersedes": {
      "previous_anchor": "sun=(557, 372), R22=210, parhelion_offset=220, inferred_h=17.3 deg",
      "discovered_via": "Task #52 step 1 anchor-capture pass",
      "why_old_failed": "Hand-mark biased sun_x by +14 px (flares pulled centroid right) and assumed symmetric offsets of 220 px; actual offsets are 212-213 px, sun is at x=543, and inferred h is ~7 deg not 17 deg."
    }
  },
  "sun": [543, 372],
  "r22": 211,
  "r22_source": "ring-fit",
  "r22_source_note": "Inherited from Phase 2 multi-photo calibration (R22=210); refined to 211 in the 2026-05-13 re-anchor. The Phase 2 R22 came from a 22-degree halo ring fit, not from the parhelion. Pass B1 classification 2026-05-13; lever sec(h)-1 = 0.71 percent, anchor-noise-bounded; clean residual is informational, not route-validating. Audit memo section 2 item 4 hedges: '0 px residual is anchor-noise-bounded, not route-validated.'",
  "parhelion": {
    "left_x": 330,
    "right_x": 755,
    "y": 351
  },
  "upper_tangent_manual_samples": {
    "method": "Pass C5 2026-05-14: visual identification attempt from photograph at original display resolution. Only the apex at the halo crown is marginally identifiable as a faint chromatic brightening; the wing region is washed into a luminous chromatic gradient with no localizable spine, consistent with Persona 1 section 3 p13 entry ('upper-tangent region above the sun is washed into a luminous chromatic gradient with no localizable brightness peak'). Insufficient for a circle fit.",
    "rationale_pointer": "PHASE10_ATTACK_ROADMAP.md Pass C5",
    "status": "insufficient_samples_for_fit",
    "points": [
      {"x": 543, "y": 165, "label": "apex marginally visible at halo crown", "confidence": "low"}
    ]
  }
}