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View article: An ancient L-type family associated with (460) Scania in the middle main belt as revealed by <i>Gaia</i> DR3 spectra
An ancient L-type family associated with (460) Scania in the middle main belt as revealed by <i>Gaia</i> DR3 spectra Open
Context . Asteroid families are typically identified using hierarchical clustering methods (HCM) in the proper element phase space. However, these methods struggle with overlapping families, interlopers, and the detection of older structur…
View article: An ancient L- type family associated to (460) Scania in the Middle Main Belt as revealed by Gaia DR3 spectra
An ancient L- type family associated to (460) Scania in the Middle Main Belt as revealed by Gaia DR3 spectra Open
Asteroid families are groups of asteroids sharing similar orbits and surface properties resulting from the disruption of a parent body. Asteroid families are usually identified using hierarchical clustering algorithms (HCM) in the proper e…
View article: Kalliope sings rock and metal.
Kalliope sings rock and metal. Open
In the classical theory of planetesimal differentiation, a body would form an iron-rich core, an olivine-dominated mantle, and a pyroxene-rich basaltic crust [1]. The detection of differentiated bodies in the current asteroid main belt wil…
View article: Understanding the Long-term Rotational Evolution of Asteroids with Gaia
Understanding the Long-term Rotational Evolution of Asteroids with Gaia Open
The rotational dynamics of asteroids are primarily governed by two mechanisms: collisions and the Yarkovsky–O'Keefe–Radzievskii–Paddack (YORP) effect. The YORP effect is a radiative torque resulting from the anisotropic emission of thermal…
View article: NEOMIR: project statut of ESA’s space-based infrared mission for NEO detection and early warning
NEOMIR: project statut of ESA’s space-based infrared mission for NEO detection and early warning Open
To warn about potential asteroid or comet impacts, we must first observe and discover these objects through dedicated NEO surveys. Most current and planned surveys are ground-based and use visible light, but they face limitations like weat…
View article: On the detection and characterization of potential Earth-impacting asteroids from space in the thermal infrared
On the detection and characterization of potential Earth-impacting asteroids from space in the thermal infrared Open
One of the major achievements of planetary science in the past century has been the discovery of a population of asteroids and comets that have the potential to impact our planet. These objects are collectively known as Near-Earth Objects …
View article: Spectral classification of Gaia DR3 Solar System small bodies and application to the search for A-type olivine-rich asteroids
Spectral classification of Gaia DR3 Solar System small bodies and application to the search for A-type olivine-rich asteroids Open
The Data Release 3 (DR3) of ESA's Gaia mission contains 60 518 mean reflectance spectra of Solar System small bodies, spanning the visible wavelength range in 16 bands [1]. Such large and homogeneous dataset is a powerful tool to study the…
View article: Refining a Thermophysical Model of the Lunar Surface using Eclipses
Refining a Thermophysical Model of the Lunar Surface using Eclipses Open
The Moon’s surface thermal environment is extreme compared to other planetary bodies in the solar system, with temperatures ranging between 400 K at the subsolar point and lower than 40 K in permanently shadowed regions around the poles (P…
View article: The potential 2024YR4 lunar impact and implications for lunar impact flash observations
The potential 2024YR4 lunar impact and implications for lunar impact flash observations Open
IntroductionThe Earth-crossing asteroid, 2024YR4, was identified in late 2024 and at its peak was rated a 3 on the Torino scale as a potentially hazardous Earth-impactor. While over 450 subsequent observations confirmed the asteroid would …
View article: Keck and Gemini Characterization of Hayabusa2# Rendezvous Target 1998 KY<sub>26</sub>
Keck and Gemini Characterization of Hayabusa2# Rendezvous Target 1998 KY<sub>26</sub> Open
Near-Earth object (NEO) 1998 KY 26 is a target of the Hayabusa2# spacecraft, which it will rendezvous with in 2031 July. The asteroid has been noted to rotate rapidly and has a large out-of-plane nongravitational acceleration. We present o…
View article: The Discovery and Characterization of Earth-crossing Asteroid 2024 YR<sub>4</sub>
The Discovery and Characterization of Earth-crossing Asteroid 2024 YR<sub>4</sub> Open
We describe observations and physical characteristics of Earth-crossing asteroid 2024 YR 4 , discovered on 2024 December 27 by the Asteroid Terrestrial-impact Last Alert System. The asteroid has semimajor axis a = 2.52 au, eccentricity e =…
View article: Kalliope sings rock and metal
Kalliope sings rock and metal Open
Asteroid (22) Kalliope is the densest known asteroid in the main belt, with a density of $\rho = 4.4 \pm 0.46$ g cm$^{-3}$, suggesting that it is differentiated. Kalliope has recently been identified as the parent body of a family of colli…
View article: Size Constraint on Hayabusa2 Extended Mission Rendezvous Target 1998 KY<sub>26</sub> via VLT/VISIR Nondetection
Size Constraint on Hayabusa2 Extended Mission Rendezvous Target 1998 KY<sub>26</sub> via VLT/VISIR Nondetection Open
1998 KY 26 is a tiny near-Earth asteroid ( H = 26.1) discovered in 1998. It has been selected as the target of the Hayabusa2 extended mission, which will rendezvous with 1998 KY 26 in 2031. However, one of the most basic physical propertie…
View article: Size Constraint on Hayabusa2 Extended Mission Rendezvous Target 1998~KY$_{26}$ via VLT/VISIR Non-detection
Size Constraint on Hayabusa2 Extended Mission Rendezvous Target 1998~KY$_{26}$ via VLT/VISIR Non-detection Open
1998~KY$_{26}$ is a tiny near-Earth asteroid ($H=26.1$) discovered in 1998. It has been selected as the target of the Hayabusa2 extended mission, which will rendezvous with 1998 KY$_{26}$ in 2031. However, one of the most basic physical pr…
View article: Keck and Gemini characterization of $Hayabusa2\#$ rendezvous target 1998 KY$_{26}$
Keck and Gemini characterization of $Hayabusa2\#$ rendezvous target 1998 KY$_{26}$ Open
Near-earth object (NEO) 1998 KY$_{26}$ is a target of the $Hayabusa2\#$ spacecraft, which it will rendezvous with in July 2031. The asteroid is a rapid rotator and has a large out-of-plane nongravitational acceleration. We present deep $g$…
View article: Preimpact Detection of Chelyabinsk‐Type Objects in the Thermal Infrared: Possibilities and Limitations
Preimpact Detection of Chelyabinsk‐Type Objects in the Thermal Infrared: Possibilities and Limitations Open
The Chelyabinsk meteor entered Earth’s atmosphere on 15 February 2013, producing a shock wave that injured about 1500 people and damaged thousands of buildings. Despite its relatively large size (∼20 m), the progenitor asteroid approached …
View article: Analysis of a thermal correction method for infrared spectroscopy: preparation for the future observations of the Martian moons Phobos and Deimos with the MIRS instrument
Analysis of a thermal correction method for infrared spectroscopy: preparation for the future observations of the Martian moons Phobos and Deimos with the MIRS instrument Open
The MIRS (MMX InfraRed Spectrometer) infrared spectrometer is part of the scientific payload of JAXA’s (Japanese Space Agency) Martian Moon eXploration (MMX) mission. From the reflected sunlight by the planetary surfaces, MIRS will provide…
View article: Numerical simulations suggest asteroids (101955) Bennu and (162173) Ryugu are likely second or later generation rubble piles
Numerical simulations suggest asteroids (101955) Bennu and (162173) Ryugu are likely second or later generation rubble piles Open
Rubble pile asteroids are widely understood to be composed of reaccumulated debris following a catastrophic collision between asteroids in the main asteroid belt, where each disruption can make a family of new asteroids. Near-Earth asteroi…
View article: The Resultant Craters from Lunar Impact Flashes
The Resultant Craters from Lunar Impact Flashes Open
IntroductionImpacts are one of the most destructive processes in the solar system, and impact craters have been identified on almost every type of solar system body. The lunar surface is covered in craters ranging from 2500 km in diameter,…
View article: The Efficiency of the Hierarchical Clustering Method
The Efficiency of the Hierarchical Clustering Method Open
The Hierarchical Clustering Method (HCM) has been the main algorithm for clustering asteroids into groups of similar origins, i.e. into families, since the early 1990s [1][2]. With surveys such as NEOWISE, GAIA and the future LSST providin…
View article: Spin states of X-complex asteroids in the Inner Main Belt confirm the existence of Athor and Zita collisional families.
Spin states of X-complex asteroids in the Inner Main Belt confirm the existence of Athor and Zita collisional families. Open
Introduction:Numerous energetic collisions between asteroids in the inner Solar System have led to the creation of groups of fragments, known as asteroid collisional families. These families populate the Main Belt, each family typically or…
View article: NEOMIR: a space based infrared mission for NEO detection, characterization and early warning
NEOMIR: a space based infrared mission for NEO detection, characterization and early warning Open
Most current and planned near-Earth objects (NEO) surveys are made with ground-based telescopes and carried out in the visible wavelength range. However, this approach has some limitations, such as (1) weather dependency, (2) only a portio…
View article: Prospects of stellar occultations with robotic telescopes
Prospects of stellar occultations with robotic telescopes Open
Stellar occultations are influential for determining shapes, sizes, and rotation states, as well as characterizing the binary population, ring systems,and debris. Additionally, occultations are a source of high-precision astrometry.I will …
View article: Detection of Chelyabinsk-type objects in the thermal infrared
Detection of Chelyabinsk-type objects in the thermal infrared Open
The Chelyabinsk progenitor asteroid approached Earth undetected, because its radiant was close to the Sun. In addition, the 20-m size object was very faint and very fast moving. Visible wavelength observations of such objects also suffer f…
View article: Size, albedo and rotational period of the Hayabusa2# target (98943) 2001 CC21 from SPITZER and groundbased observations
Size, albedo and rotational period of the Hayabusa2# target (98943) 2001 CC21 from SPITZER and groundbased observations Open
The Japan Aerospace Exploration Agency's (JAXA) Hayabusa2 mission, following the successful return of samples of the near-Earth asteroid (NEA, 162173) Ryugu, in December 2020, has been extended to explore two more NEAs. These are (98943) 2…
View article: Gaia reflectance spectra reveal unexpected abundance of asteroids potentially originating from the mantle of differentiated bodies.&#160;&#160;
Gaia reflectance spectra reveal unexpected abundance of asteroids potentially originating from the mantle of differentiated bodies.   Open
We present our observational survey devoted to the search of asteroids with a spectral class that is consistent with an olivine-rich composition. We will present our findings and their implications for the "missing mantle problem" (Burbine…