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Size, Shape, Density, and Atmospheric Limit of (50000) Quaoar Revealed from 14 years of Stellar Occultation

  • Authors: Giuliano Margoti, Felipe Braga-Ribas, José Luis Ortiz, Bruno Sicardy, Josselin Desmars, Morgado B. E., Eros de Oliveira Gradovski, Chrystian Luciano Pereira, Pablo Santos-Sanz, Altair Ramos Gomes-Júnior, Julio Ignacio Bueno de Camargo, Marcelo Assafin, Vieira-Martins Roberto, Yucel Kilic, Damya Souami, René Duffard, Gustavo Benedetti-Rossi, Tiago Pinheiro, Maísa Poiani, Eduardo Rondón, Marcelo Emilio, Dave Herald, Rafael Sfair, Nicolas Morales, Francois Colas, Frédéric Vachier, Mónica Vara Lubiano, Rodrigo Boufleur, Mert Acar, Francisco J. Aceituno, Miguel R. Alarcon, Sinan Alis, Sergio Alonso, Javier Alonso-Santiago, Flavia Amadio, Laerte Andrade, Pascal André, Jonatã Arcas-Silva, Alper K. Ates, David Lafuente Aznar, Michael Backes, Mehmed Naim Bagiran, Nelson Balcar, M. A. Barry, Khalid Barkaoui, Wolfgang Beisker, Kirk Bender, Zouhair Benkhaldoun, Svetlana Boeva, Eberhard H. R. Bredner, Richard Busuttil, A. Y. Burdanov, Oscar Canales, Javier Zaragoza-Cardiel, V. Casanova, Matheus Leal Castanheira, Peter Ceravolo, Steven J. Conard, Luciano Negrello Correa, Daniel V. Cotton, V. S. Dhillon, Serena Diamond, Vlad Dumitrescu, Joan Dunham, David W. Dunham, Christopher L. Duston, Eslam Elhosseiny, Orhan Erece, Sila Eryilmaz, Emilio J. Fernandez-García, Suleyman Fisek, R. Scott Fisher, Clyde Foster, Eric Frappa, Antonio Frasca, Jonah Frey, José María Gómez-Limón Gallardo, Jose Luis Maestre Garcia, Dave Gault, Kosmas Gazeas, Kai Getrost, Michaël Gillon, Alan Gilmore, Robert Glassey, Bruce Gowe, K. D. Green, William Hanna, Nicholas J. Haigh, Dean Hooper, Kamil Hornoch, Dragana Ilić, Cristóvão Jacques, Felix Jankowsky, Emmanuel Jehin, Selami Kalkan, Roxanne Kamin, Monika K. Kaminska, Shai Kaspi, J. J. Kavelaars, Stephen Kerr, Ulrich Kolb, Richard Komžík, Dogan T. Koseoglu, Mike Kretlow, Sangeeta Kuchibhotla, Jean Lecacheux, Arnaud Leroy, Alexios Liakos, Luana Liberato, Peter Lindner, S. P. Littlefair, Jose M. Madiedo, Natalio Maícas, Marcio Malacarne, Paul Maley, Jan Mánek, Anna Marciniak, Patrick Martinez, Ramón Iglesias-Marzoa, Graeme McKay, Steve Messner, Zdenek Moravec, Eduardo Fonseca Morato, Messias Fidêncio Neto, John Newman, Vadim Nikitin, Richard Nolthenius, Peter Nosworthy, Mohammad Odeh, W. Ogloza, Sibel Otken, Sacit Özdemir, András Pál, Ashley Pennell, Amauri Pereira, Carles Perello, Jean Perkins, Konstantin von Poschinger, Thiago do Prado, Theodor Pribulla, Sohrab Rahvar, Giovana Ramon, Seth Redfield, Claudine Rinner, Jean-Pierre Rivet, Johannes Antunes Nascimento Rodrigues, Antonio Román-Reche, Flavia Luane Rommel, T. de Santana, T. Santana-Ros, Antoni Selva, Christoph M. Schaefer, Andrew Scheck, Carles Schnabel, Olivier Schreurs, Andreas Schweizer, M. Serra-Ricart, Michael F. Skrutskie, Ned Smith, Colin Snodgrass, Eda Sonbas, A. Sota, Rafael Ribeiro de Sousa, Fabio Augusto Spina, Theodore Swift, Róbert Szakáts, Ali Takey, Mohammad F. Talafha, Ramachrisna Teixeira, Zahide Terzioğlu, Qiushi Chris Tian, Vagelis Tsamis, Eyüp Kaan Ülgen, Anne Verbiscer, Oliver Vince, Marcos Rincon Voelzke, Christian Weber, Julien de Wit, Michal Zejmo

Giuliano Margoti et al 2026 The Astrophysical Journal 1008 .

  • Provider: AAS Journals

Caption: Figure 2.

Best fit of the oblate ellipsoidal model: a = b = 566.1 km, c = 511.2 km, αQ = 259﹩\mathop{.}\limits^{{\unicode{x000b0}}}﹩7, and δQ = 53﹩\mathop{.}\limits^{{\unicode{x000b0}}}﹩4. This model does not account for the rotation period or initial phase. The blue lines are the observed positive chords with their associated uncertainties, shown as red segments. The green dashed lines are the negative chords used to constrain the model. The 2025 August 28 occultation shows duplicated frames due to a dual detection of Quaoar, suggesting a possible duplicity in the target star. The fit where the star was too far from zero ephemeris was excluded from both the ellipsoid fitting and the determination of Quaoar’s astrometric position.

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