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DOI 10.1038/s41467-025-65749-1

Медицинская библиотека · Nature communications · 2025

Accurate geometric albedo, shape, and size of Hi'iaka from a stellar occultation.

Fernández-Valenzuela Estela, Ortiz Jose Luis, Holler Bryan J, Sicardy Bruno, Rommel Flavia L, Vara-Lubiano Mónica, Morales Nicolas, Vachier Frederic, Desmars Josselin, Kretlow Mike, Vieira-Martins Roberto, Jehin Emmanuel, Ferrais Marin, Santos-Sanz Pablo, Rustamkulov Zafar, de la Vega Alexander, Warner Elizabeth, Benkhaldoun Zouhair, Kamin Roxanne, Ryan Al, Earls Bernie, Conti Dennis, de Wit Julien, Burdanov Artem, Francini Richard, Langill Philip, Morales Ruben, Fraser Wesley, Kiss Csaba, Pál András, Souami Damya, Lecacheux Jean, Braga-Ribas Felipe, Duffard René, Alvarez-Candal Alvaro, Benedetti-Rossi Gustavo, Morgado Bruno, Camargo Julio I B, Júnior Altair Ramos Gomes, Assafin Marcelo, Aissa Djounai Baba, Grigahcene Zaki, Buie Marc W, Licandro Javier, Alarcon Miguel R, Serra-Ricart Miquel, Castro-Tirado Alberto, Fernandez-Garcia Emilio Jesus, Iglesias-Marzoa Ramón, Galindo-Guil Francisco J, González Hugo, Gonçalves Rui, Rengstorf Adam, Flynn Randy, Olsen Aart, Hanna Bill, Barnes Jason, A'Hearn Joseph A, Kreyche Steven M, Miller William J, Mortensen Lillian E, Gibson Thomas C, Walker Gary, Stolle-McAllister Gerogia, Feiden Gregory A, Froetschel Joseph, Steel Suzanne, Encardes Destin, Fisher R Scott, Luken Alton, Holcomb Eric, Caton Daniel, Dunford Bob, Monin Dmitry

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Аннотация

Stellar occultations, when a distant object passes in front of a star and casts a shadow on Earth, are a powerful tool to probe the physical properties of solar system bodies. They enable precise size and shape measurements and can reveal rings, satellites, atmospheres, or surface features. Here we present results from two stellar occultations by Hi'iaka, dwarf planet Haumea's largest satellite, observed in April 2021. The second event yielded the first documented multi-chord occultation involving a trans-Neptunian satellite other than Charon. Combining these data with photometric observations, we find that Hi'iaka is a triaxial ellipsoid with a volume-equivalent diameter of 370 ± 20 km and a density of 640 ± 80 kg/m³, indicating a porous interior. The visible geometric albedo is 0.76 ± 0.15 , (∼ 30 % higher than Haumea's). The combination of low density and rapid rotation (9.68 ± 0.02 hours), under the assumption of a homogeneous body, indicates that Hi'iaka deviates from hydrostatic equilibrium.

Для цитирования: Fernández-Valenzuela Estela, Ortiz Jose Luis, Holler Bryan J, Sicardy Bruno, Rommel Flavia L, Vara-Lubiano Mónica, Morales Nicolas, Vachier Frederic, Desmars Josselin, Kretlow Mike, Vieira-Martins Roberto, Jehin Emmanuel, Ferrais Marin, Santos-Sanz Pablo, Rustamkulov Zafar, de la Vega Alexander, Warner Elizabeth, Benkhaldoun Zouhair, Kamin Roxanne, Ryan Al, Earls Bernie, Conti Dennis, de Wit Julien, Burdanov Artem, Francini Richard, Langill Philip, Morales Ruben, Fraser Wesley, Kiss Csaba, Pál András, Souami Damya, Lecacheux Jean, Braga-Ribas Felipe, Duffard René, Alvarez-Candal Alvaro, Benedetti-Rossi Gustavo, Morgado Bruno, Camargo Julio I B, Júnior Altair Ramos Gomes, Assafin Marcelo, Aissa Djounai Baba, Grigahcene Zaki, Buie Marc W, Licandro Javier, Alarcon Miguel R, Serra-Ricart Miquel, Castro-Tirado Alberto, Fernandez-Garcia Emilio Jesus, Iglesias-Marzoa Ramón, Galindo-Guil Francisco J, González Hugo, Gonçalves Rui, Rengstorf Adam, Flynn Randy, Olsen Aart, Hanna Bill, Barnes Jason, A'Hearn Joseph A, Kreyche Steven M, Miller William J, Mortensen Lillian E, Gibson Thomas C, Walker Gary, Stolle-McAllister Gerogia, Feiden Gregory A, Froetschel Joseph, Steel Suzanne, Encardes Destin, Fisher R Scott, Luken Alton, Holcomb Eric, Caton Daniel, Dunford Bob, Monin Dmitry. Accurate geometric albedo, shape, and size of Hi'iaka from a stellar occultation.. Nature communications. 2025. DOI: 10.1038/s41467-025-65749-1.
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