{
  "abstract": "We present results from 28 stellar occultations by the large Trans-Neptunian Object (50000) Quaoar registered between 2018 and 2025. By performing a joint analysis of this occultation data-set, along with other 9 published events, we were able to fit an oblate ellipsoid shape, with equatorial semi-axes, a and b of 566.1+2.5-2.2 km, and a polar semi-axis, c, of 511.2+3.6-3.7 km. It provides an equivalent volumetric diameter of 1094.4 +/- 4.6 km and polar oblateness of 0.097 +/- 0.011. Considering an absolute magnitude of H = 2.79 +/- 0.35, we derive a geometric albedo of pV = 0.125 +/- 0.038. We have derived new upper limits to the surface pressure of a CH4 atmosphere of 0.15 nbar (1-sigma) and 0.65 nbar (3-sigma). We also provide a table with the 36 new astrometric positions for Quaoar. Using the new system mass derived from Weywot's orbit around Quaoar, we calculated a density of 1.760 +/- 0.109 g/cm3. Moreover, from the derived size and rotation period (8.8394 +/- 0.0002 hours (Ortiz et al. 2003)), we calculate that, if Quaoar is in Maclaurin hydrostatic equilibrium state, it would have a density of 1.859 +/- 0.200 g/cm3. This result, within the error bars, is compatible with the value we found. Therefore, this work shows that Quaoar can be a Maclaurin object, being eligible as a dwarf planet.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 174,
  "authors": [
    {
      "name": "Giuliano Margoti"
    },
    {
      "name": "Felipe Braga-Ribas"
    },
    {
      "name": "José Luis Ortiz"
    },
    {
      "name": "Bruno Sicardy"
    },
    {
      "name": "Josselin Desmars"
    },
    {
      "name": "B. Morgado"
    },
    {
      "name": "Eros de Oliveira Gradovski"
    },
    {
      "name": "Chrystian Luciano Pereira"
    },
    {
      "name": "Pablo Santos-Sanz"
    },
    {
      "name": "Altair Ramos Gomes-Júnior"
    },
    {
      "name": "Julio Ignacio Bueno de Camargo"
    },
    {
      "name": "Marcelo Assafin"
    },
    {
      "name": "Vieira-Martins Roberto"
    },
    {
      "name": "Yucel Kilic"
    },
    {
      "name": "Damya Souami"
    },
    {
      "name": "René Duffard"
    },
    {
      "name": "Gustavo Benedetti-Rossi"
    },
    {
      "name": "Tiago Pinheiro"
    },
    {
      "name": "Maísa Poiani"
    },
    {
      "name": "Eduardo Rondón"
    },
    {
      "name": "Marcelo Emilio"
    },
    {
      "name": "Dave Herald"
    },
    {
      "name": "Rafael Sfair"
    },
    {
      "name": "Nicolas Morales"
    },
    {
      "name": "Francois Colas"
    },
    {
      "name": "Frédéric Vachier"
    },
    {
      "name": "Mónica Vara Lubiano"
    },
    {
      "name": "Rodrigo Boufleur"
    },
    {
      "name": "Mert Acar"
    },
    {
      "name": "Francisco Aceituno"
    },
    {
      "name": "Miguel Alarcon"
    },
    {
      "name": "Sinan Alis"
    },
    {
      "name": "Sergio Alonso"
    },
    {
      "name": "Javier Alonso-Santiago"
    },
    {
      "name": "Flavia Amadio"
    },
    {
      "name": "Laerte Andrade"
    },
    {
      "name": "Pascal André"
    },
    {
      "name": "Jonatã Arcas-Silva"
    },
    {
      "name": "Alper Ateş"
    },
    {
      "name": "David Lafuente Aznar"
    },
    {
      "name": "Michael Backes"
    },
    {
      "name": "Mehmed Naim Bagiran"
    },
    {
      "name": "Nelson Balcar"
    },
    {
      "name": "M. Barry"
    },
    {
      "name": "Khalid Barkaoui"
    },
    {
      "name": "Wolfgang Beisker"
    },
    {
      "name": "Kirk Bender"
    },
    {
      "name": "Zouhair Benkhaldoun"
    },
    {
      "name": "Svetlana Boeva"
    },
    {
      "name": "Eberhard Bredner"
    },
    {
      "name": "Richard Busuttil"
    },
    {
      "name": "Oscar Canales"
    },
    {
      "name": "Javier Zaragoza-Cardiel"
    },
    {
      "name": "V. Casanova"
    },
    {
      "name": "Matheus Leal Castanheira"
    },
    {
      "name": "Peter Ceravolo"
    },
    {
      "name": "Steven Conard"
    },
    {
      "name": "Luciano Negrello Correa"
    },
    {
      "name": "Daniel Cotton"
    },
    {
      "name": "V. Dhillon"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/10gbk179m4fxm.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/ae907e",
  "fulltext_url": null,
  "id": "10gbk179m4fxm",
  "issns": [
    "0004-637X",
    "1538-4357"
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  "landing_url": "https://hal.science/hal-05790199v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
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  "pdf_url": "https://hal.science/hal-05790199/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/10gbk179m4fxm.ris",
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      "first_seen": "2026-10-30T12:17:56Z",
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      "field": "astronomy",
      "origin": "openalex:3103|Astro and Planetary Science",
      "subfield": "planetary"
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  ],
  "title": "Size, shape, density, and atmospheric limit of (50000) Quaoar revealed from 14 years of stellar occultation",
  "title_text": "Size, shape, density, and atmospheric limit of (50000) Quaoar revealed from 14 years of stellar occultation",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:56Z",
  "url": "https://research.draconitic.com/paper/10gbk179m4fxm",
  "venue": "The Astrophysical Journal",
  "versions": []
}