{
  "abstract": "We present results from a stellar occultation by the asteroid (623) Chimaera on October 21st, 2025, when it passed in front of V magnitude 13.86 star UCAC4 626-004193. Chimaera is the largest asteroid in the Chimaerid asteroid family and will be subject to a spacecraft flyby in the 2030s. Eighteen telescopes were deployed, spanning the United States from Arizona to North Carolina, incrementally spaced by $\\sim4.4$\\,km with respect to the cross-track of the shadow. In total, sixteen telescopes collected useful data. This multi-chord observation, when compiled into a single sky-plane plot, suggests a profile which is well-described by an elongated elliptical fit, with a semi-major axis $a=26.2\\pm0.8$ km and a semi-minor axis $b=16.0\\pm1.0$ km. The projected area from ellipse fitting is 1316 km$^2$, and a limb fit is calculated to enclose 1312 km$^2$. Photometry collected in the Gaia G band over a seven-month period coinciding with the occultation corresponds to a geometric albedo $p_G=0.059\\pm0.005$; comparing with archival occultation observations and direct observations gives $p_G=0.051\\pm0.004$ and $p_V=0.051\\pm0.004$. We compare occultation sky-plane projections with 3-D modeling from inversion techniques and demonstrate that the models can accurately predict the orientation of Chimaera at the time of each occultation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.08041",
  "author_total": 28,
  "authors": [
    {
      "name": "Phillip Oakey"
    },
    {
      "name": "Keya Garg"
    },
    {
      "name": "Andrey Moore"
    },
    {
      "name": "Altony Foote"
    },
    {
      "name": "Michael F. Skrutskie"
    },
    {
      "name": "Anne J. Verbiscer"
    },
    {
      "name": "Matthew Nelson"
    },
    {
      "name": "Marc W. Buie"
    },
    {
      "name": "Diego Gomez"
    },
    {
      "name": "Lauren Daszynski"
    },
    {
      "name": "Charlie Dorsey"
    },
    {
      "name": "Roger Venable"
    },
    {
      "name": "Vadim Nikitin"
    },
    {
      "name": "Joan Dunham"
    },
    {
      "name": "David Dunham"
    },
    {
      "name": "Nadara Hudson"
    },
    {
      "name": "Colin Surovell"
    },
    {
      "name": "Norman Carlson"
    },
    {
      "name": "Georgia Clickner"
    },
    {
      "name": "James Beck"
    },
    {
      "name": "Mark Chernov"
    },
    {
      "name": "Tristan Howdyshell"
    },
    {
      "name": "Paul D. Maley"
    },
    {
      "name": "Ted Barnes"
    },
    {
      "name": "John DiPasquale"
    },
    {
      "name": "Casey York"
    },
    {
      "name": "Ted Blank"
    },
    {
      "name": "Henk de Groot"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1xzknmzw1w219.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.08041",
  "fulltext_url": null,
  "id": "1xzknmzw1w219",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.08041",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.EP"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.08041",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1xzknmzw1w219.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.08041",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.08041"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    }
  ],
  "title": "Results from a Stellar Occultation by (623) Chimaera",
  "title_text": "Results from a Stellar Occultation by (623) Chimaera",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:41Z",
  "url": "https://research.draconitic.com/paper/1xzknmzw1w219",
  "venue": "arXiv",
  "versions": []
}