{
  "$schema": "https://themachinepress.com/schemas/story-v1.schema.json",
  "schema_version": "1.0.0",
  "document_type": "machine_press_story",
  "story": {
    "story_id": "mp-2026-11-06-026",
    "source_story_id": "tmp-story-jades-y-dwarf",
    "edition_id": "mp-2026-11-06-morning-0119",
    "edition_url": "https://themachinepress.com/edition/2026-11-06",
    "position": 15,
    "story_type": "dispatch",
    "section": "research",
    "editorial_classification": "editorial",
    "headline": "JWST Measures the Most Distant Known Ultra-Cold Y Dwarf",
    "slug": "jwst-measures-the-most-distant-known-ultra-cold-y-dwarf",
    "dek": "A two-year NIRCam baseline places JADES-GS-BD-5 about 64 parsecs away, roughly three times farther than prior parallax-measured Y dwarfs.",
    "summary": "A two-year NIRCam baseline places JADES-GS-BD-5 about 64 parsecs away, roughly three times farther than prior parallax-measured Y dwarfs.",
    "body_text": "The team measures 49.8 milliarcseconds per year of proper motion and a parallax of 15.7 milliarcseconds, yielding a geometric distance of 64 parsecs with stated uncertainty of plus six and minus five. Its inferred motion fits the Galactic thin disk, while its faint luminosity and near-infrared spectrum place it beyond Y1 and among the coldest dwarfs known. Evolution models put it in the planetary-mass regime, though current atmosphere models do not reproduce the full spectral-energy distribution.",
    "why_it_matters": "A two-year NIRCam baseline places JADES-GS-BD-5 about 64 parsecs away, roughly three times farther than prior parallax-measured Y dwarfs.",
    "limitations": [
      "Evolution models put it in the planetary-mass regime, though current atmosphere models do not reproduce the full spectral-energy distribution."
    ],
    "importance": 9,
    "canonical_url": "https://themachinepress.com/story/mp-2026-11-06-026/jwst-measures-the-most-distant-known-ultra-cold-y-dwarf",
    "json_url": "https://themachinepress.com/story/mp-2026-11-06-026.json",
    "first_published_at": "2026-11-06T09:00:00.000-05:00",
    "modified_at": "2026-11-06T09:00:00.000-05:00",
    "content_status": "new",
    "is_carryover": false,
    "carryover_reason": null,
    "key_claims": [
      {
        "claim_id": "claim-mp-2026-11-06-026-001",
        "text": "A two-year NIRCam baseline places JADES-GS-BD-5 about 64 parsecs away, roughly three times farther than prior parallax-measured Y dwarfs.",
        "source_ids": [
          "source-2026-11-06-015"
        ],
        "qualification": "Evolution models put it in the planetary-mass regime, though current atmosphere models do not reproduce the full spectral-energy distribution."
      }
    ],
    "source_ids": [
      "source-2026-11-06-015"
    ],
    "tags": [
      "JWST",
      "brown dwarfs",
      "parallax",
      "JADES"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-11-06-015",
      "title": "arXiv preprint 2611.08346, original v1",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2611.08346v1",
      "canonical_url": "https://arxiv.org/abs/2611.08346v1",
      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-11-05T12:31:30.000-05:00",
      "accessed_at": "2026-11-06T08:21:03.209-05:00",
      "supports_claim_ids": [
        "claim-mp-2026-11-06-026-001"
      ]
    }
  ],
  "corrections": [],
  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
  },
  "cite_this_report": {
    "title": "JWST Measures the Most Distant Known Ultra-Cold Y Dwarf",
    "publisher": "The Machine Press",
    "published_at": "2026-11-06T09:00:00.000-05:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-11-06-026/jwst-measures-the-most-distant-known-ultra-cold-y-dwarf"
  }
}