B. E. Morgado
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View article: Accurate geometric albedo, shape, and size of Hi’iaka from a stellar occultation
Accurate geometric albedo, shape, and size of Hi’iaka from a stellar occultation Open
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 …
View article: Dynamical Environment and Stability around Centaur (2060) Chiron
Dynamical Environment and Stability around Centaur (2060) Chiron Open
A recent stellar occultation revealed that the Centaur (2060) Chiron hosts a broad disk extending beyond ∼200 km from its center, embedding three ring-like structures (Chi1R, Chi2R, and Chi3R), while a tenuous outer ring (Chi4R) lies beyon…
View article: The Rings of (2060) Chiron: Evidence of an Evolving System
The Rings of (2060) Chiron: Evidence of an Evolving System Open
The centaur (2060) Chiron has long been a candidate for hosting material in orbit, based on occultation and photometric and spectroscopic data. Here, we present a multichord stellar occultation observed on 2023 September 10 UT that reveals…
View article: JWST occultation reveals unforeseen complexity in Chariklo's ring system
JWST occultation reveals unforeseen complexity in Chariklo's ring system Open
Ring systems have been discovered around several small bodies in the outer Solar System through stellar occultations. While such measurements provide key information about ring geometry and dynamical interactions, little is known about the…
View article: A high geometric albedo and small size for the Haumea cluster member (24835) 1995 SM <sub>55</sub> determined from a stellar occultation and photometric observations
A high geometric albedo and small size for the Haumea cluster member (24835) 1995 SM <sub>55</sub> determined from a stellar occultation and photometric observations Open
Context . Trans-Neptunian objects (TNOs) are thought to be some of the most ancient and primitive bodies in our Solar System. Understanding their basic physical properties is crucial to unraveling their origin and the evolution of the oute…
View article: Size and Shape of Jupiter Trojan (2207) Antenor from Stellar Occultations
Size and Shape of Jupiter Trojan (2207) Antenor from Stellar Occultations Open
Librating around the Lagrange L5, the Jupiter’s Trojan (2207) Antenor has been observed in recent years and its rotational light curve suggests it to be a very likely binary asteroid candidate. From stellar occultations, we report results …
View article: Multi-epoch stellar occultations by the large trans-Neptunian object (28978) Ixion
Multi-epoch stellar occultations by the large trans-Neptunian object (28978) Ixion Open
Stellar occultations provide a powerful technique for precisely determining the physical properties of small Solar System bodies, including their size, shape, surface characteristics, and the presence of potential atmospheres or ring syste…
View article: On the formation of satellites in dense solid-particle disks
On the formation of satellites in dense solid-particle disks Open
Single massive satellites are of great observational interest, as they can produce prominent and potentially detectable signatures. For terrestrial planets and super-Earths, giant impacts in the late stages of formation may generate dense …
View article: A Cloud-native Agile approach to cyber platform prototyping and integration for astronomy: the ENGAGE SKA case
A Cloud-native Agile approach to cyber platform prototyping and integration for astronomy: the ENGAGE SKA case Open
The Square Kilometre Array (SKA) Observatory is gearing up the formal construction of its two radio interferometers in Australia and South Africa after the end of design and pre-construction phases. Agile methodologies, the Cloud native Co…
View article: The trans-Neptunian object (119951) 2002 KX14 revealed via multiple stellar occultations
The trans-Neptunian object (119951) 2002 KX14 revealed via multiple stellar occultations Open
Context. Trans-Neptunian objects (TNOs) are icy bodies located in the outer solar system that offer key insights into the primordial conditions of our planetary system. The stellar occultation technique has proven to be an essential tool f…
View article: Physical characteristics of Jupiter's Trojan (1437) Diomedes from a tri-chord stellar occultation in 2020 and dimensionless three-dimensional model
Physical characteristics of Jupiter's Trojan (1437) Diomedes from a tri-chord stellar occultation in 2020 and dimensionless three-dimensional model Open
Jupiter Trojans preserve primitive formation characteristics owing to their collisionless, stable orbits. Determination of their shapes and size-frequency distribution helps constrain the collisional evolution of their parent population, w…
View article: Stellar Occultation Observations of (38628) Huya and Its Satellite: A Detailed Look into the System
Stellar Occultation Observations of (38628) Huya and Its Satellite: A Detailed Look into the System Open
The physical and orbital parameters of trans-Neptunian objects provide valuable information about the solar system’s formation and evolution. In particular, the characterization of binaries provides insights into the formation mechanisms t…
View article: Stellar occultation observations of (38628) Huya and its satellite: a detailed look into the system
Stellar occultation observations of (38628) Huya and its satellite: a detailed look into the system Open
The physical and orbital parameters of Trans-Neptunian Objects (TNOs) provide valuable information about the Solar System's formation and evolution. In particular, the characterization of binaries provides insights into the formation mecha…
View article: Physical Characteristics of Jupiter's Trojan (1437) Diomedes from a Tri-chord Stellar Occultation in 2020 and Dimensionless 3D Model
Physical Characteristics of Jupiter's Trojan (1437) Diomedes from a Tri-chord Stellar Occultation in 2020 and Dimensionless 3D Model Open
Jupiter Trojans preserve primitive formation characteristics due to their collisionless stable orbits. Determination of their shapes and size-frequency distribution constrains the collisional evolution of their parent population which also…
View article: Centaur 29P/Schwassmann-Wachmann 1 and its near-nucleus environment from a stellar occultation
Centaur 29P/Schwassmann-Wachmann 1 and its near-nucleus environment from a stellar occultation Open
Comets offer valuable insights into the early Solar System's conditions and processes. Stellar occultations enables detailed study of cometary nuclei typically hidden by their coma. Observing the star's light passing through the coma helps…
View article: PASO -- Astronomy and Space Situational Awareness in a Dark Sky Destination
PASO -- Astronomy and Space Situational Awareness in a Dark Sky Destination Open
The Pampilhosa da Serra Space Observatory (PASO) is located in the center of the continental Portuguese territory, in the heart of a certified Dark Sky destination by the Starlight Foundation (Aldeias do Xisto) and has been an instrumental…
View article: The two rings of (50000) Quaoar (<i>Corrigendum</i>)
The two rings of (50000) Quaoar (<i>Corrigendum</i>) Open
International audience
View article: Constraints on Triton atmospheric evolution from occultations: 1989-2022
Constraints on Triton atmospheric evolution from occultations: 1989-2022 Open
Context - Around the year 2000, Triton's south pole experienced an extreme summer solstice that occurs every about 650 years, when the subsolar latitude reached about 50°. Bracketing this epoch, a few occultations probed Triton's atmospher…
View article: Constraints on the evolution of the Triton atmosphere from occultations: 1989–2022
Constraints on the evolution of the Triton atmosphere from occultations: 1989–2022 Open
Context. In about 2000, the south pole of Triton experienced an extreme summer solstice that occurs every ∼650 years, when the subsolar latitude reached about 50°S. Bracketing this epoch, a few occultations probed the Triton atmosphere in …
View article: Physical properties of Centaur (60558) 174P/Echeclus from stellar occultations
Physical properties of Centaur (60558) 174P/Echeclus from stellar occultations Open
The Centaur (60558) Echeclus was discovered on 2000 March 03, orbiting between the orbits of Jupiter and Uranus. After exhibiting frequent outbursts, it also received a comet designation, 174P. If the ejected material can be a source of de…
View article: Physical properties of Centaur (60558) 174P/Echeclus from stellar occultations
Physical properties of Centaur (60558) 174P/Echeclus from stellar occultations Open
The Centaur (60558) Echeclus was discovered on March 03, 2000, orbiting between the orbits of Jupiter and Uranus. After exhibiting frequent outbursts, it also received a comet designation, 174P. If the ejected material can be a source of d…
View article: Kilometer-precise (UII) Umbriel physical properties from the multichord stellar occultation on 2020 September 21
Kilometer-precise (UII) Umbriel physical properties from the multichord stellar occultation on 2020 September 21 Open
We report the results of the stellar occultation by (UII) Umbriel on 2020 September 21. The shadow crossed the USA and Canada, and 19 positive chords were obtained. A limb parameter accounted for putative topographic features in the limb f…
View article: The 2021 mutual phenomena involving the Galilean satellites of Jupiter and the inner satellite Thebe
The 2021 mutual phenomena involving the Galilean satellites of Jupiter and the inner satellite Thebe Open
Astrometric studies and orbital modelling of planetary moons have contributed significantly to advancing our understanding of their orbital dynamics. These studies require precise positions measured over extended periods. In this paper, we…
View article: The 2021 mutual phenomena involving the Galilean satellites of Jupiter and the inner satellite Thebe
The 2021 mutual phenomena involving the Galilean satellites of Jupiter and the inner satellite Thebe Open
Astrometric studies and orbital modeling of planetary moons have contributed significantly to advancing our understanding of their orbital dynamics. These studies require precise positions measured over extended periods. In this paper, we …
View article: A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS<sub>4</sub> measured from stellar occultations
A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS<sub>4</sub> measured from stellar occultations Open
Context. The physical characterization of trans-Neptunian objects is essential for improving our understanding of the formation and evolution of our Solar System. Stellar occultation is a ground-based technique that can be successfully use…
View article: Dynamical characterization of the 6/1 mean motion resonance between Quaoar's ring and Weywot
Dynamical characterization of the 6/1 mean motion resonance between Quaoar's ring and Weywot Open
Recently, it has been reported the discovery of a dense ring around the trans-Neptunian object 50000 Quaoar. The ring particles seem to be very close to the 6/1 mean motion resonance with Weywot, the only known satellite in the system. In …
View article: The changing material around (2060) Chiron from an occultation on 2022 December 15
The changing material around (2060) Chiron from an occultation on 2022 December 15 Open
We could accurately predict the shadow path and successfully observe an occultation of a bright star by Chiron on 2022 December 15. The Kottamia Astronomical Observatory in Egypt did not detect the occultation by the solid body, but we det…
View article: Changing material around (2060) Chiron revealed by an occultation on December 15, 2022
Changing material around (2060) Chiron revealed by an occultation on December 15, 2022 Open
We were able to accurately predict the shadow path and successfully observe an occultation of a bright star by Chiron on December 15, 2022. The Kottamia Astronomical Observatory in Egypt did not detect the occultation by the solid body, bu…
View article: Constraints on (2060) Chiron’s size, shape, and surrounding material from the November 2018 and September 2019 stellar occultations
Constraints on (2060) Chiron’s size, shape, and surrounding material from the November 2018 and September 2019 stellar occultations Open
Context. After the discovery of rings around the largest known Centaur object, (10199) Chariklo, we carried out observation campaigns of stellar occultations produced by the second-largest known Centaur object, (2060) Chiron, to better cha…