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View article: Coordinated Planetary Defence in action: orbit determination and impact monitoring of asteroid 2024 YR4
Coordinated Planetary Defence in action: orbit determination and impact monitoring of asteroid 2024 YR4 Open
Asteroid 2024 YR4 was discovered on 27 December 2024 by the ATLAS survey, and within days, preliminary orbit determinations revealed a non-negligible probability of Earth impact in December 2032. Less than a month after discovery, the impa…
View article: Discovery and Preliminary Characterization of a Third Interstellar Object: 3I/ATLAS
Discovery and Preliminary Characterization of a Third Interstellar Object: 3I/ATLAS Open
We report initial observations aimed at the characterization of a third interstellar object. This object, 3I/ATLAS or C/2025 N1 (ATLAS), was discovered on 2025 July 1 UT and has an orbital eccentricity of $e\sim6.1$, perihelion of $q\sim 1…
Astrometry, orbit determination, and thermal inertia of the Tianwen-2 target asteroid (469219) Kamo‘oalewa Open
Context. (469219) Kamo‘oalewa is a small near-Earth asteroid (NEA) that is currently a quasi-satellite of the Earth. Light curve measurements have also revealed a rotation period of only about 30 minutes. This asteroid has been selected as…
Astrometry, orbit determination, and thermal inertia of the Tianwen-2 target asteroid (469219) Kamo`oalewa Open
Context. (469219) Kamo`oalewa is a small near-Earth asteroid, which is currently a quasi-satellite of the Earth. Lightcurve measurements also reveal a rotation period of only about 30 minutes. This asteroid has been selected as the target …
The fall of asteroid 2024 XA$_1$ and the location of possible meteorites Open
Asteroid 2024 XA$_1$ was discovered on 3 December 2024 at 05:54 UTC by the Bok telescope in Kitt Peak, Arizona, and impacted Earth about 10 hours later over a remote area of the Sakha Republic (Russia). The estimated size of the object was…
View article: Asteroid detection polar equation calculation and graphical representation
Asteroid detection polar equation calculation and graphical representation Open
Context. The observability of an asteroid from the ground depends on the distance to the Sun and the observer, on the phase angle, on the object shape, and on its surface reflectivity properties. Several magnitude systems have been propose…
View article: The Aegis Orbit Determination and Impact Monitoring System and services of the ESA NEOCC web portal
The Aegis Orbit Determination and Impact Monitoring System and services of the ESA NEOCC web portal Open
The NEO Coordination Centre (NEOCC) of the European Space Agency is an operational centre that, among other activities, computes the orbits of near-Earth objects and their probabilities of impact with the Earth. The NEOCC started providing…
Ab initio strewn field for small asteroids impacts Open
In recent years, nine small near-Earth asteroids were discovered a few hours before the collision with the Earth: these are about one meter in diameter objects that have all disintegrated in the atmosphere, generating bright fireballs with…
Assessment of Flyby Methods as Applied to Close Encounters among Asteroids Open
Orbital flybys have been extensively studied for spacecraft missions, resulting in effective mathematical and physical models. However, these models’ applicability to natural encounters involving asteroids has not been explored. This paper…
View article: The recovery of the Matera H5 ordinary chondrite thanks to the observations of the PRISMA fireball network
The recovery of the Matera H5 ordinary chondrite thanks to the observations of the PRISMA fireball network Open
On 14/02/2023 at 17:68:29 UT, three all-sky cameras of the PRISMA network detected a bright bolide (IT20230214) over the regions of Puglia and Basilicata in Southern Italy. The bolide traversed the atmosphere for about 5.3 s, with an entry…
Asteroid Thermal Inertia Analyzer Open
We developed the new model and corresponding publicly available software for determining the surface thermal inertia (TI) of asteroids [1,2]. We named it ASTERIA (Asteroid Thermal Inertia Analyzer). The model allows TI estimation based mos…
View article: (469219) Kamoʻoalewa, A Space Weathering Matured Small NEA: Target of the Tianwen-2 Sample-Return Mission
(469219) Kamoʻoalewa, A Space Weathering Matured Small NEA: Target of the Tianwen-2 Sample-Return Mission Open
Understanding the nature and evolution of near-Earth asteroids (NEAs) are of paramount importance to planetary science1 and security2. So far, three asteroid sample-return missions, Hayabusa, Hayabusa2, and OSIRIS-REx to asteroids have gre…
Long-term orbital evolution of dimorphos boulders and implications on the origin of meteorites Open
By using recent observations of the Dydimos−Dimorphos system from the Hubble Space Telescope, 37 boulders with a size of 4 to 7 m ejected from the system during the impact with the DART spacecraft were identified. In this work, we studied …
Long-term orbital evolution of Dimorphos boulders and implications on the origin of meteorites Open
By using recent observations of the Dydimos-Dimorphos system from the Hubble Space Telescope, 37 boulders with a size of 4 to 7 meters ejected from the system during the impact with the DART spacecraft were identified. In this work, we stu…
ASTERIA—Asteroid Thermal Inertia Analyzer Open
Thermal inertia estimates are available for a limited number of a few hundred objects, and the results are practically solely based on thermophysical modeling (TPM). We present a novel thermal inertia estimation method, the Asteroid Therma…
An automated procedure for the detection of the Yarkovsky effect and results from the ESA NEO Coordination Centre Open
Context . The measurement of the Yarkovsky effect on near-Earth asteroids (NEAs) is common practice in orbit determination today, and the number of detections will increase with the developments of new and more accurate telescopic surveys.…
An automated procedure for the detection of the Yarkovsky effect and results from the ESA NEO Coordination Centre Open
Context: The measurement of the Yarkovsky effect on near-Earth asteroids (NEAs) is common practice in orbit determination today, and the number of detections will increase with the developments of new and more accurate telescopic surveys. …
ASTERIA -- Asteroid Thermal Inertia Analyzer Open
Thermal inertia estimates are available for a limited number of a few hundred objects, and the results are practically solely based on thermophysical modeling (TPM). We present a novel thermal inertia estimation method, Asteroid Thermal In…
Identifying parent bodies of meteorites among near-Earth asteroids Open
Meteorites provide an important source of information about the formation and composition of asteroids, because the level of accuracy of studies and analyses performed in a laboratory cannot be achieved by any ground- or space-based observ…
Identifying parent bodies of meteorites among near-Earth asteroids Open
Meteorites provide an important source of information about the formation and composition of asteroids, because the level of accuracy of studies and analyses performed in a laboratory cannot be achieved by any ground or space based observa…
The low surface thermal inertia of the rapidly rotating near-Earth asteroid 2016 GE1 Open
Context . Asteroids smaller than about 100 m in diameter are observed to rotate very fast, with periods often much shorter than the critical spin limit of 2.2 h. Some of these super-fast rotators can also achieve a very large semimajor axi…
The low surface thermal inertia of the rapidly rotating near-Earth asteroid 2016 GE1 Open
Asteroids smaller than about 100 meters are observed to rotate very fast, with periods often much shorter than the critical limit of 2.2 h. Some of these super-fast rotators can also achieve a very large semi-major axis drift induced by th…
Maps of secular resonances in the NEO region Open
Context. From numerical simulations, it is known that some secular resonances may affect the motion of near-Earth objects (NEOs). However, the specific location of the secular resonance inside the NEO region is not fully known because the …
The Likely Thermal Evolution of the Irregularly Shaped S-Type Astraea Asteroid Open
The thermal evolution of asteroids provides information on the thermal processes of the protoplanetary disk. Since irregular bodies have a large surface subject to fast heat loss, we used the finite element method (FEM) to explore the like…
Demystifying Near-Earth Asteroids Open
Introduction: Knowledge of the physical and surface properties of most NEAs lags far behind the current rate of their discoveries. Still, asteroid surfaces and internal structures are very diverse, and knowledge derived from a limited numb…
Mercury and OrbFit packages for numerical orbit propagation: Implementation of the Yarkovsky and YORP effects Open
Introduction: The dynamics of Solar System objects is determined by their mutual gravitational interactions. In addition, non-gravitational effects need to be taken into account to properly model the dynamics of objects smaller than about …
Bifurcations of balanced configurations for the Newtonian n-body problem in $$\mathbb {R}^4$$ Open
For the gravitational n -body problem, the simplest motions are provided by those rigid motions in which each body moves along a Keplerian orbit and the shape of the system is a constant (up to rotations and scalings) configuration featuri…
Local minimality properties of circular motions in $1/r^α$ potentials and of the figure-eight solution of the 3-body problem Open
We first take into account variational problems with periodic boundary conditions, and briefly recall some sufficient conditions for a periodic solution of the Euler-Lagrange equation to be either a directional, a weak, or a strong local m…