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    "headline": "The Error Bar Stayed Small While the Astrometry Drifted",
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    "dek": "ADORA simulations showed high-order wavefront mismatch could bias a solution without widening its local uncertainty.",
    "summary": "ADORA simulations showed high-order wavefront mismatch could bias a solution without widening its local uncertainty.",
    "body_text": "The differentiable optical model jointly estimates astrometric and instrument state for the proposed SHERA mission. Matched simulations reached roughly 11 microarcseconds scatter, but unmodeled wavefront error produced strong bias with deceptively small posterior sigma.",
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    "tags": [
      "astrometry",
      "differentiable optics",
      "exoplanets"
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  "sources": [
    {
      "source_id": "source-2026-08-21-021",
      "title": "arXiv preprint 2608.19409",
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      "published_at": "2026-08-18T20:00:00.000-04:00",
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    "title": "The Error Bar Stayed Small While the Astrometry Drifted",
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