Trans-Neptunian objects; Kuiper belt; Small Solar System bodies; Stellar occultation; Classical Kuiper belt objects
Abstract :
[en] 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 dataset, along with nine other published events, we were able to fit an oblate ellipsoid shape, with equatorial semiaxes a and b of 566.1-2.2+2.5 km, and a polar semiaxis, c, of 511.2-3.7+3.6 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 (1σ) and 0.65 nbar (3σ). 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 cm-3. Moreover, from the derived size and rotation period (8.8394 ± 0.0002 hr, we calculated that, if Quaoar is in Maclaurin hydrostatic equilibrium state, it would have a density of 1.859 ± 0.200 g cm-3. 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
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Braga-Ribas, Felipe; National Astronomy Observatory, Brazil, -, -, -
Ortiz, José Luis; Institute of Astrophysics of Andalusia
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Morgado, B. E.; Universidade Federal do Rio de Janeiro--Observatório do Valongo, Ladeira do Pedro Antônio 43, Rio de Janeiro, RJ 20.080-090, Brazil
de Oliveira Gradovski, Eros; National Astronomy Observatory, Brazil, -, -
Pereira, Chrystian Luciano; National Astronomy Observatory, Brazil, -
Santos-Sanz, Pablo; Institute of Astrophysics of Andalusia
Gomes-Júnior, Altair Ramos; Laboratório Interinstitucional de e-Astronomia--LIneA, Av. Pastor Martin Luther King Jr 126, CEP: 20765-000 Rio de Janeiro, RJ, Brazil, Universidade Federal de Uberlândia (UFU), Uberlândia, MG, Brazil
Bueno de Camargo, Julio Ignacio; National Astronomy Observatory, Brazil, -
Assafin, Marcelo; Laboratório Interinstitucional de e-Astronomia--LIneA, Av. Pastor Martin Luther King Jr 126, CEP: 20765-000 Rio de Janeiro, RJ, Brazil, Universidade Federal do Rio de Janeiro--Observatório do Valongo, Ladeira do Pedro Antônio 43, Rio de Janeiro, RJ 20.080-090, Brazil
Vieira-Martins, Roberto; National Astronomy Observatory, Brazil
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Duffard, René; Institute of Astrophysics of Andalusia
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Pinheiro, Tiago; National Astronomy Observatory, Brazil
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Rondón, Eduardo; National Astronomy Observatory, Brazil
Marcelo, Emilio; National Astronomy Observatory, Brazil, -
Herald, Dave; Trans Tasman Occultation Alliance (TTOA), P.O. Box 3181, Wellington, New Zealand
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Fernandez-García, Emilio J.; Institute of Astrophysics of Andalusia
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Ilić, Dragana; University of Belgrade, Department of Astronomy, University of Hamburg, Hamburg Observatory
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