299 citations · 636 across the 34 of their papers we have counts for
34 papers
The dynamically hazardous asteroid 2025 TV. A new co-orbital asteroid of Venus
V. Carruba, R. Sfair, O. C. Winter
Twenty co-orbital asteroids of Venus are currently known, several of which may evolve into potentially hazardous asteroids (PHAs) over timescales of thousands of years. We report t…
Constraining the size, shape, and albedo of the large Trans-Neptunian Object (28978) Ixion with multi-chord stellar occultations
Y. Kilic, F. Braga-Ribas, C. L. Pereira +81
Trans-Neptunian objects (TNOs) are among the most primitive remnants of the early Solar System, and constraining their sizes, shapes, albedos, and surface properties is essential f…
The invisible threat: assessing the collisional hazard posed by the undiscovered Venus co-orbital asteroids
V. Carruba, R. Sfair, R. A. Araujo +7
Currently, 20 co-orbital asteroids of Venus are known, with only one with an eccentricity below 0.38. This is most likely caused by observational biases since asteroids with larger…
The Moon as a possible source for Earth's co-orbital bodies
R. Sfair, L. C. Gomes, O. C. Winter +3
There is a growing number of Earth's co-orbital bodies being discovered. At least five of them are known to be temporarily in quasi-satellite orbits. One of those, 469219 Kamo'oale…
Orbit, meteoroid size, and cosmic ray exposure history of the Aguas Zarcas CM2 breccia
Peter Jenniskens, Gerardo J. Soto, Gabriel Goncalves Silva +21
The Aguas Zarcas (Costa Rica) CM2 carbonaceous chondrite fell during night time in April 2019. Security and dashboard camera video of the meteor were analyzed to provide a trajecto…
Dust production through collisions between small bodies: an application to the G-ring arc
V. Lattari, R. Sfair, P. B. Siqueira +1
The G-ring arc of Saturn, confined by the 7:6 corotation eccentric resonance with Mimas, is primarily composed of micrometric particles. These particles, significantly influenced b…
Stellar occultation observations of (38628) Huya and its satellite: a detailed look into the system
F. L. Rommel, E. Fernández-Valenzuela, B. C. N. Proudfoot +78
The physical and orbital parameters of Trans-Neptunian Objects (TNOs) provide valuable information about the Solar System's formation and evolution. In particular, the characteriza…
A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS measured from stellar occultations
F. L. Rommel, F. Braga-Ribas, J. L. Ortiz +201
This work aims at constraining the size, shape, and geometric albedo of the dwarf planet candidate 2002 MS4 through the analysis of nine stellar occultation events. Using multichor…
Dynamics around the binary system (65803) Didymos
R. Machado Oliveira, O. C. Winter, R. Sfair +3
Didymos and Dimorphos are primary and secondary, respectively, asteroids who compose a binary system that make up the set of Near Earth Asteroids (NEAs). They are targets of the Do…
(130) Elektra Delta -- on the stability of the new third moonlet
Giulia Valvano, Rai Machado Oliveira, Othon Cabo Winter +2
The aim of this work is to verify the stability of the proposed orbital solutions for the third moonlet (Delta) taking into account a realistic gravitational potential for the cent…
Milliarcsecond astrometry for the Galilean moons using stellar occultations
B. E. Morgado, A. R. Gomes-Júnior, F. Braga-Ribas +40
A stellar occultation occurs when a Solar System object passes in front of a star for an observer. This technique allows the determination of sizes and shapes of the occulting body…
The main perturbing objects on the orbits of (616) Prometheus and (617) Pandora
A. R. Gomes-Júnior, T. Santana, O. C. Winter +1
The dynamical evolution of the Prometheus and Pandora pair of satellites is chaotic, with a short 3.3 years Lyapunov time. It is known that the anti-alignment of the apses line of…
APOPHIS -- Effects of the 2029 Earth's Encounter on the Surface and Nearby Dynamics
Giulia Valvano, Othon Cabo Winter, Rafael Sfair +3
The 99942 Apophis close encounter with Earth in 2029 may provide information about asteroid's physical characteristics and measurements of Earth's effects on the asteroid surface.…
Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020
B. E. Morgado, B. Sicardy, F. Braga-Ribas +78
The Centaur (10199) Chariklo has the first rings system discovered around a small object. It was first observed using stellar occultation in 2013. Stellar occultations allow the de…
Constraining the nature of the possible extrasolar PDS110b ring system
Tiago F. L. L. Pinheiro, Rafael Sfair
The young star PDS110 in the Ori OB1a association underwent two similar eclipses in 2008 and 2011, each of which lasted for a period of at least 25 days. One plausible explanation…
Stability and Evolution of Fallen Particles Around the Surface of Asteroid (101955) Bennu
A. Amarante, O. C. Winter, R. Sfair
In this work, we study the dynamics of particles around Bennu. The goal is to understand the stability, evolution, and final outcome of the simulated particles around the asteroid.…
Stellar occultations enable milliarcsecond astrometry for Trans-Neptunian objects and Centaurs
F. L. Rommel, F. Braga-Ribas, J. Desmars +66
Trans-Neptunian objects (TNOs) and Centaurs are remnants of our planetary system formation, and their physical properties have invaluable information for evolutionary theories. Ste…
Neptune's ring arcs confined by coorbital satellites: dust orbital evolution through solar radiation
Silvia Maria Giuliatti Winter, Gustavo Madeira, Rafael Sfair
Voyager 2 images confirmed the presence of ring arcs around Neptune. These structures need a confinement mechanism to constrain their spreading due to collisions, dissipative force…
Asteroid triple system 2001 SN263 : surfaces characteristics and dynamical environment
O. C. Winter, G. Valvano, T. S. Moura +3
The (153591) 2001 SN263 asteroid system, target of the first Brazilian interplanetary space mission, is one of the known three triple systems within the population of NEAs. One of…
Dynamical Environment and Surface Characteristics of Asteroid (16) Psyche
T. S. Moura, O. C. Winter, A. Amarante +3
Radar observations show that (16) Psyche is one of the largest and most massive asteroids of the M-class located in the main belt, with a diameter of approximately 230 km. This fac…
Cosmology from an exponential dependence on the trace of the energy-momentum tensor -- Numerical approach and cosmological tests
G. Ribeiro, R. Sfair, P. H. R. S. Moraes +2
In this paper, we present the cosmological scenario obtained from gravity by using an exponential dependence on the trace of the energy-momentum tensor. With a numerical a…
The 2014-2015 Brazilian Mutual Phenomena campaign for the Jovian satellites and improved results for the 2009 events
B. Morgado, R. Vieira-Martins, M. Assafin +15
Progress in astrometry and orbital modelling of planetary moons in the last decade enabled better determinations of their orbits. These studies need accurate positions spread over…
The trans-Neptunian object (84922) 2003 VS2 through stellar occultations
Gustavo Benedetti-Rossi, P. Santos-Sanz, J. L. Ortiz +50
We present results from three world-wide campaigns that resulted in the detections of two single-chord and one multi-chord stellar occultations by the Plutino object (84922) 2003~V…
First stellar occultation by the Galilean moon Europa and upcoming events between 2019 and 2021
B. Morgado, G. Benedetti-Rossi, A. R. Gomes-Júnior +21
Context. Bright stellar positions are now known with an uncertainty below 1 mas thanks to Gaia DR2. Between 2019-2020, the Galactic plane will be the background of Jupiter. The den…