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an understanding of the post-impact dynamics of ejecta clouds are crucial to the planning of a kinetic impact mission to an asteroid, and also has great implications for the history of planetary formation. the purpose of this article is to track the evolution of ejecta produced by aida mission, which targets for kineti... | ejecta cloud from the aida space project kinetic impact on the secondary of a binary asteroid: i. mechanical environment and dynamical model |
methods to constrain the surface mineralogy of asteroids have seen considerable development during the last decade, with advancement in laboratory spectral calibrations and validation of interpretive methodologies by spacecraft rendezvous missions. this has enabled the accurate identification of several meteorite paren... | mineralogy and surface composition of asteroids |
one of the most accurate models currently used to represent the gravity field of irregular bodies is the polyhedral approach. in this model, the mass of the body is assumed to be homogeneous, which may not be true for a real object. the main goal of the this paper is to study the dynamical effects induced by three diff... | the dynamical environment of asteroid 21 lutetia according to different internal models |
comets and small planetesimals are believed to contain primordial building blocks in the form of millimeter to centimeter sized pebbles. one of the viable growing mechanisms to form these small bodies is through the streaming instability (si) in which pebbles cluster and gravitationally collapse toward a planetesimal o... | the radial structure of planetary bodies formed by the streaming instability |
asteroid (3200) phaethon, a b-type asteroid, has been active during its perihelion passages. this asteroid is considered to be a source of the geminid meteor stream. it is reported that this asteroid is spinning at a rotation period of 3.60 hr and has a top shape (an oblate body with an equatorial ridge) with a mean eq... | mass-shedding activities of asteroid (3200) phaethon enhanced by its rotation |
a determination of the dynamical evolution of the asteroid belt is difficult because the asteroid belt has evolved since the time of asteroid formation through mechanisms that include: (1) catastrophic collisions, (2) rotational disruption, (3) chaotic orbital evolution, and (4) orbital evolution driven by yarkovsky ra... | dynamical evolution of the inner asteroid belt |
asteroid-mass primordial black holes (pbhs) can explain the observed dark matter abundance while being consistent with the current indirect detection constraints. these pbhs can produce gamma-ray signals from hawking radiation that are within the sensitivity of future measurements by the amego and e-astrogam experiment... | correlating gravitational wave and gamma-ray signals from primordial black holes |
context. large and publicly available astronomical archives open up new possibilities to search for and study solar system objects. however, advanced techniques are required to deal with the large amounts of data. these unbiased surveys can be used to constrain the size distribution of minor bodies, which represents a ... | hubble asteroid hunter. i. identifying asteroid trails in hubble space telescope images |
mounting discoveries of debris discs orbiting newly formed stars and white dwarfs (wds) showcase the importance of modelling the long-term evolution of small bodies in exosystems. wd debris discs are, in particular, thought to form from very long-term (0.1-5.0 gyr) instability between planets and asteroids. however, th... | linking long-term planetary n-body simulations with periodic orbits: application to white dwarf pollution |
the focus of this paper is to connect the rotating mass dipole with natural elongated bodies. the dipole system is consisted with two point masses connected with a massless rod in a constant characteristic distance. a brief introduction on the dynamics near the rotating mass dipole is given with the distribution of its... | study on the connection between the rotating mass dipole and natural elongated bodies |
the yarkovsky-o'keefe-radzievskii-paddack (yorp) effect is a small thermal-radiation torque experienced by small asteroids, and is considered to be crucial in their physical and dynamical evolution. it is important to understand this effect by providing measurements of yorp for a range of asteroid types to facilitate t... | detection of the yorp effect on the contact binary (68346) 2001 kz66 from combined radar and optical observations |
the extraordinary weather conditions available between february and march 2022 over spain have allowed us to analyse the brightest fireballs recorded by the monitoring stations of the spanish meteor network (spmn). we study the atmospheric flight of 15 large meteoroids to determine if they are meteorite dropper events ... | identifying meteorite droppers among the population of bright 'sporadic' bolides imaged by the spanish meteor network during the spring of 2022 |
dynamical models and observational evidence indicate that water-rich asteroids and comets deliver water to objects throughout the solar system, but the mechanisms by which this water is captured have been unclear. new experiments reveal that impact melts and breccias capture up to 30% of the water carried by carbonaceo... | the delivery of water by impacts from planetary accretion to present |
previous efforts have modeled the didymos system as two irregularly shaped rigid bodies, although it is likely that one or both components are in fact rubble piles. here, we relax the rigid-body assumption to quantify how this affects the spin and orbital dynamics of the system following the dart impact. given the know... | dynamical evolution of the didymos-dimorphos binary asteroid as rubble piles following the dart impact |
in 2018, the near-earth object (155140) 2005 ud (hereafter ud) experienced a close fly by of the earth. we present results from an observational campaign involving photometric, spectroscopic, and polarimetric observations carried out across a wide range of phase angles (0°7-88°). we also analyze archival neowise observ... | new evidence for a physical link between asteroids (155140) 2005 ud and (3200) phaethon |
elephant moraine (eet) 96029 is a cm carbonaceous chondrite regolith breccia with evidence for unusually mild aqueous alteration, a later phase of heating and terrestrial weathering. the presence of phyllosilicates and carbonates within chondrules and the fine-grained matrix indicates that this meteorite was aqueously ... | elephant moraine 96029, a very mildly aqueously altered and heated cm carbonaceous chondrite: implications for the drivers of parent body processing |
dawn conducted an extensive exploration of dwarf planet ceres, the largest object between the sun and pluto that had not previously been visited by a spacecraft. following its arrival at ceres in march 2015, dawn acquired all the planned data from four circular polar orbits ranging in altitude from 13,600 km to 385 km.... | dawn at ceres: the first exploration of the first dwarf planet discovered |
recent remote measurements and in-situ observations confirm the idea that asteroids up to few hundreds of meters in size might be aggregates of loosely consolidated material, or 'rubble piles'. the dynamics of these objects can be studied using n-body simulations of gravitational aggregation. we investigate the role of... | the role of fragment shapes in the simulations of asteroids as gravitational aggregates |
asteroids are the "time capsules" of the solar system, storing the origin and evolution of the protoplanetary disk. in addition, they are the remaining "building blocks" of the earth and terrestrial planets, preserving the initial materials of the latter. to study the first 10 million years history of the solar system,... | a multisite and anti-cross-contamination brief touch sampler for asteroid sample return mission☆ |
the osiris-rex spacecraft collected a surface sample from hokioi crater (55.8° n, 42.3° e; diameter ~20 m) on the asteroid bennu in 2020 october. we explore the geology of the sample collection site, known as nightingale, by using digital terrain models, relative albedo maps, and images collected by the osiris-rex spac... | geologic context of the osiris-rex sample site from high-resolution topography and imaging |
dust emission was detected on main-belt asteroid 596 scheila in 2010 december and was attributed to the collision of a few-tens-of-meters projectile on the surface of the asteroid. in such an impact, the ejected material from the collided body is expected to mainly come from its fresh, unweathered subsurface. therefore... | the appearance of a "fresh" surface on 596 scheila as a consequence of the 2010 impact event |
the chicxulub crater is the site of an asteroid impact linked with the cretaceous-paleogene (k-pg) mass extinction at ∼66 ma. this asteroid struck in shallow water and caused a large tsunami. here we present the first global simulation of the chicxulub impact tsunami from initial contact of the projectile to global pro... | the chicxulub impact produced a powerful global tsunami |
maskelynite is a diaplectic glass that forms from plagioclase at shock pressures of ∼20-30 gpa, depending on the ca concentration. the proportion of maskelynite-rich samples in a basaltic meteorite group correlates with the parent-body escape velocity and serves as a shock indicator of launching conditions. for eucrite... | maskelynite in asteroidal, lunar and planetary basaltic meteorites: an indicator of shock pressure during impact ejection from their parent bodies |
the original hydrogen isotope (d/h) ratios of different planetary bodies may indicate where each body formed in the solar system. however, geological and atmospheric processes can alter these ratios through time. over the past few decades, d/h ratios in meteorites from vesta and mars, as well as from s- and c-type aste... | d/h ratios of the inner solar system |
regolith generation by thermal fatigue has been identified as a dominant mechanism for the breakdown of small (cm-sized) rocks on certain airless bodies. simple numerical models for thermal fatigue seemed to indicate that this breakdown occurs faster in the larger decimeter-sized rocks, which is in contrast to the pred... | the efficiency of thermal fatigue in regolith generation on small airless bodies |
asteroid families are a valuable source of information to many asteroid-related researches, assuming a reliable list of their members could be obtained. however, as the number of known asteroids increases fast it becomes more and more difficult to obtain a robust list of members of an asteroid family. here, we are prop... | an automatic approach to exclude interlopers from asteroid families |
we conducted a geologic mapping investigation of dawn spacecraft data to determine the geologic history of the kerwan impact basin region of dwarf planet ceres, which is mostly located in the ac-7 kerwan quadrangle. geological mapping was applied to dawn framing camera images from the low altitude mapping orbit (lamo, ... | the geology of the kerwan quadrangle of dwarf planet ceres: investigating ceres' oldest, largest impact basin |
digital biofeedback systems (dbss) are used in physical rehabilitation to improve outcomes by engaging and educating patients and have the potential to support patients while doing targeted exercises during home rehabilitation. the components of feedback (mode, content, frequency and timing) can influence motor learnin... | feedback design in targeted exercise digital biofeedback systems for home rehabilitation: a scoping review |
context. the detection of earth-like planets, exocomets or kuiper belts show that the different components found in the solar system should also be present in other planetary systems. trojans are one of these components and can be considered fossils of the first stages in the life of planetary systems. their detection ... | the troy project: searching for co-orbital bodies to known planets. i. project goals and first results from archival radial velocity |
the discovery of the first interstellar asteroid, 1i/2017 u1 (‘oumuamua), has opened a new era for research on interstellar objects. in this paper, we study the rotational dynamics of interstellar asteroids (isas) of irregular shapes moving through the interstellar gas. we find that regular mechanical torques resulting... | spinup and disruption of interstellar asteroids by mechanical torques, and implications for 1i/2017 u1 (‘oumuamua) |
in the frame of near-earth-object exploration and planetary defence, the two-part aida mission is currently studied by nasa and esa. being composed of a kinetic impactor, dart (nasa), and by an observing spacecraft, aim (esa), aida has been designed to deliver vital data to determine the momentum transfer efficiency of... | mascot2 - a small body lander to investigate the interior of 65803 didymos‧ moon in the frame of the aida/aim mission |
this paper proposes the use of solar-sail technology currently under development at nasa langley research center for a cubesat rendezvous mission with asteroid 2016 ho3, a quasi-satellite of earth. time-optimal trajectories are sought for within a 2022-2023 launch window, starting from an assumed launcher ejection cond... | trajectory design for a solar-sail mission to asteroid 2016 ho3 |
an engineering mission okeanos to explore a jupiter trojan asteroid, using a solar power sail is currently under study. after a decade-long cruise, it will rendezvous with the target asteroid, conduct global mapping of the asteroid from the spacecraft, and in situ measurements on the surface, using a lander. science go... | science exploration and instrumentation of the okeanos mission to a jupiter trojan asteroid using the solar power sail |
a set of high-fidelity simulated asteroid materials, or simulants, was developed based on the mineralogy of carbonaceous chondrite meteorites. three varieties of simulant were developed based on ci1 chondrites (typified by orgueil), cm2 chondrites (typified by murchison), and cr2/3 chondrites (multiple samples). the si... | simulated asteroid materials based on carbonaceous chondrite mineralogies |
previous full-lifetime simulations of single-star multi-planet systems across all phases of stellar evolution have predominately assumed coplanar or nearly coplanar orbits. here we assess the consequences of this assumption by removing it and exploring the effect of giant branch mass loss on the stability of two-planet... | effects of non-kozai mutual inclinations on two-planet system stability through all phases of stellar evolution |
we describe systematic ranging, an orbit determination technique suitable to assess the near-term earth impact hazard posed by newly discovered asteroids. for these late warning cases, the time interval covered by the observations is generally short, perhaps a few hours or even less, which leads to severe degeneracies ... | systematic ranging and late warning asteroid impacts |
how can we design mechanisms to promote efficient use of shared resources? here, we answer this question in relation to the well-studied class of atomic congestion games, used to model a variety of problems, including traffic routing. within this context, a methodology for designing tolling mechanisms that minimize the... | optimal taxes in atomic congestion games |
a multicolour phase-polarization curve of asteroid (3200) phaethon has been obtained during the 2017 december apparition by merging measurements taken at the observing station of calern (france) and at the rozhen observatory (bulgaria). all the observations were obtained in the positive polarization branch, the phase a... | the phase-polarization curve of asteroid (3200) phaethon† |
the design of low-thrust-based multitarget interplanetary missions requires a method to quickly and accurately evaluate the low-thrust transfer between any two visiting targets. complete evaluation of the low-thrust transfer includes not only the estimation of the optimal fuel consumption but also the judgment of trans... | fast evaluation of low-thrust transfers via multilayer perceptions |
the full two-body problem (f2bp) is often used to model binary asteroid systems, representing the bodies as two finite mass distributions whose dynamics are influenced by their mutual gravity potential. the emergent behavior of the f2bp is highly coupled translational and rotational mutual motion of the mass distributi... | doubly synchronous binary asteroid mass parameter observability |
we present an analysis of the accuracy of geometric albedos determined for asteroids through the modeling of observed thermal infrared radiation. we show that albedo uncertainty is dominated by the uncertainty on the measured hv absolute magnitude, and that any analysis using albedos in a statistical application will a... | uncertainties on asteroid albedos determined by thermal modeling |
we present an overview of the skymapper optical follow-up programme for gravitational-wave event triggers from the ligo/virgo observatories, which aims at identifying early gw170817-like kilonovae out to $∼200 mpc$ distance. we describe our robotic facility for rapid transient follow-up, which can target most of the sk... | skymapper optical follow-up of gravitational wave triggers: alert science data pipeline and ligo/virgo o3 run |
we used the times of occultations and eclipses between the components of the 65803 didymos binary system observed in its light curves from 2003 to 2021 to estimate the orbital parameters of dimorphos relative to didymos. we employed a weighted least-squares approach and a modified keplerian orbit model in order to acco... | anticipating the dart impact: orbit estimation of dimorphos using a simplified model |
we study the capture of interstellar objects (isos) by a planet-star binary with mass ratio q ≪ 1, semimajor axis ap, orbital speed vc, and eccentricity ep. very close (slingshot) and wide encounters with the planet are amenable to analytical treatment, while numerically obtained capture cross-sections σ closely follow... | capture of interstellar objects - i. the capture cross-section |
detached eclipsing binaries are the primary tool used to measure precise masses and radii of stars. in our previous paper estimating the parameters of more than 30 000 detached eclipsing binaries, we identified 766 eclipsing binaries with additional features in their all-sky automated survey for supernovae (asas-sn) an... | the value-added catalogue of asas-sn eclipsing binaries - ii. properties of extra-physics systems |
in this paper, we present an open-source software (simulator of asteroid malformation under stress, samus) that simulates constant-density, constant-viscosity liquid bodies subject to tidal forces for a range of assumed viscosities and sizes. this software solves the navier-stokes equations on a finite-element mesh, in... | numerical simulations of tidal deformation and resulting light curves of small bodies: material constraints of 99942 apophis and 1i/'oumuamua |
the cryogenic wide-field infrared survey explorer (wise) mission in 2010 was extremely sensitive to asteroids and not biased against detecting dark objects. the albedos of 428 near earth asteroids (neas) observed by wise during its fully cryogenic mission can be fit quite well by a three parameter function that is the ... | the albedo distribution of near earth asteroids |
context. according to the latest theoretical and isotopic evidence, earth's water content originates mainly from today's asteroid belt region, or at least from the same precursor material. this suggests that water was transported inwards to earth, and to similar planets in their habitable zone, via (giant) collisions o... | realistic collisional water transport during terrestrial planet formation. self-consistent modeling by an n-body-sph hybrid code |
the cm carbonaceous chondrites have all been aqueously altered, and some of them were subsequently heated in a parent body environment. here we have sought to understand the impact of short duration heating on a highly aqueously altered cm through laboratory experiments on allan hills (alh) 83100. unheated alh 83100 co... | signatures of the post-hydration heating of highly aqueously altered cm carbonaceous chondrites and implications for interpreting asteroid sample returns |
relatively recent cometary impacts at the moon could leave unique traces of their origins: high impact velocities and volatile abundances, combined with the presence of a dust- and ice-laden coma, may thermally and mechanically process the lunar surface in ways distinct from the impact of an asteroid. here we analytica... | cometary impact effects at the moon: implications for lunar swirl formation |
nasa's osiris-rex and jaxa's hayabusa2 sample-return missions are currently on their way to encounter primitive near-earth asteroids (101955) bennu and (162173) ryugu, respectively. spectral and dynamical evidence indicates that these near-earth asteroids originated in the inner part of the main belt. there are several... | expected spectral characteristics of (101955) bennu and (162173) ryugu, targets of the osiris-rex and hayabusa2 missions |
erg chech (ec) 002 is a meteorite with andesitic composition, potentially recording the lava crystallization and crust formation of its parent body. nucleosynthetic cr isotope composition (ɛ54cr = -0.35 ± 0.06) for ec 002 suggests a non-carbonaceous region of the solar system, and possibly represents the crustal compos... | radiogenic chromium isotope evidence for the earliest planetary volcanism and crust formation in the solar system |
images of asteroids (162173) ryugu and (101955) bennu acquired by the hayabusa2 and osiris-rex missions, respectively, reveal rocky worlds covered in rubble. these two asteroids do not have hydrostatic shapes, indicating that they possess some internal friction and/or cohesion even if they lack tensile strength. unders... | rotational states and shapes of ryugu and bennu: implications for interior structure and strength |
the asteroid impact & deflection assessment (aida) targets binary near-earth asteroid (65803) didymos. as part of this mission, the nasa-led double asteroid redirection test (dart) will make a kinetic impactor collide with the smaller secondary of didymos to test kinetic impact asteroid deflection technology, while... | assessing possible mutual orbit period change by shape deformation of didymos after a kinetic impact in the nasa-led double asteroid redirection test |
aims: we model thermal evolution and water-rock differentiation of small ice-rock objects that accreted at different heliocentric distances, while also considering migration into the asteroid belt for ceres. we investigate how water-rock separation and various cooling processes influence ceres' structure and its therma... | ceres' partial differentiation: undifferentiated crust mixing with a water-rich mantle |
ceres is the largest body in the main asteroid belt. it was recently explored by the dawn mission to uncover strong similarities with other icy bodies. the morphological features observed on the surface of ceres indicate a relatively wide range of water ice concentrations, leading us to investigate the magnitude and di... | true polar wander of ceres due to heterogeneous crustal density |
surface morphologies of a regolith particle retrieved from asteroid 25143 itokawa were observed using field-emission scanning electron microscopy (fe-sem). the images were compared with the internal structures of the space-weathered rim of the same particle observed by transmission electron and scanning transmission el... | surface and internal structures of a space-weathered rim of an itokawa regolith particle |
nasa's osiris-rex spacecraft arrived at its sampling target, asteroid (101955) bennu, in december 2018 and started a series of global observation campaigns. here we investigate the global photometric properties of bennu as observed by the osiris-rex visible and infrared spectrometer (ovirs) over the time period decembe... | photometry of asteroid (101955) bennu with ovirs on osiris-rex |
collisional and dynamical models of the main asteroid belt allow us to glean insights into planetesimal- and planet-formation scenarios as well as how the main belt reached its current state. here we discuss many of the processes affecting asteroidal evolution and the constraints that can be used to test collisional mo... | the collisional evolution of the main asteroid belt |
the surfaces of airless bodies such as lunar and s-type asteroids typically become spectrally redder in visible to near-infrared reflectance with longer exposures to space weathering. however, some carbonaceous asteroids instead become spectrally bluer. space weathering experiments on carbonaceous meteorites have provi... | the role of hydrated minerals and space weathering products in the bluing of carbonaceous asteroids |
with the flourishing number of small body missions that involve surface interactions, understanding the mechanics of spacecraft - surface interactions is crucial for improving our knowledge about the landing phases of space missions, for preparing spacecraft operations, and for interpreting the results of measurements ... | low-velocity impacts into granular material: application to small-body landing |
ceres is the largest asteroid belt object, and the dawn spacecraft observed ceres since 2015. dawn observed two morphologically distinct linear features on ceres's surface: secondary crater chains and pit chains. pit chains provide unique insights into ceres's interior evolution. we interpret pit chains called the samh... | evidence for the interior evolution of ceres from geologic analysis of fractures |
northwest africa (nwa) 6704 is a unique achondrite characterized by a near-chondritic major element composition with a remarkably intact igneous texture. to investigate the origin of this unique achondrite, we have conducted a combined petrologic, chemical, and 187re-187os, o, and ti isotopic study. the meteorite consi... | the origin of the unique achondrite northwest africa 6704: constraints from petrology, chemistry and re-os, o and ti isotope systematics |
in the preparation for esa's euclid mission and the large amount of data it will produce, we train deep convolutional neural networks (cnns) on euclid simulations to classify solar system objects from other astronomical sources. using transfer learning we are able to achieve a good performance despite our tiny data set... | detecting solar system objects with convolutional neural networks |
the osiris-rex mission will conduct a radio science investigation of the asteroid bennu with a primary goal of estimating the mass and gravity field of the asteroid. the spacecraft will conduct proximity operations around bennu for over 1 year, during which time radiometric tracking data, optical landmark tracking imag... | the osiris-rex radio science experiment at bennu |
in september 2020, the u.s. national aeronautics and space administration (nasa) announced that it is seeking proposals from private companies to extract small amounts of regolith from the surface of the moon. according to nasa administrator jim bridenstine, the exercise will buttress an interpretation of international... | u.s. policy puts the safe development of space at risk |
the textures and accretion ages of chondrites have been used to argue that their parent asteroids never differentiated. without a core, undifferentiated planetesimals could not have generated magnetic fields through dynamo activity, so chondrites are not expected to have experienced such fields. however, the magnetic r... | paleomagnetic evidence for a partially differentiated ordinary chondrite parent asteroid |
it is likely that multiple bodies with masses between those of mars and earth (“planetary embryos”) formed in the outer planetesimal disk of the solar system. some of these were likely scattered by the giant planets into orbits with semimajor axes of hundreds of au. mutual torques between these embryos may lift the per... | producing distant planets by mutual scattering of planetary embryos |
context. dynamical and albedo properties suggest that asteroids in cometary orbits (acos) are dormant or extinct comets. their study provides new insights for understanding the end-states of comets and the size of the comet population.aims: we intend to study the visible and near-infrared (nir) spectral properties of d... | the visible and near-infrared spectra of asteroids in cometary orbits |
non-magmatic iron meteorites, including the iie group, can provide important insights into the history of metal-silicate differentiation and collisions on planetesimals. to better constrain the evolution of metal segregation and impacts on the iie parent body, w isotopic data are reported for 10 iie iron meteorites and... | age and origin of iie iron meteorites inferred from hf-w chronology |
we present a new analysis of spitzer observations of comet 29p/schwassmann-wachmann 1 taken on ut 2003 november 21, 23, and 24, similar to a previous investigation of the observations (stansberry et al., 2004), but using the most recent spitzer data pipeline products and intensive image processing techniques. analysis ... | a new analysis of spitzer observations of comet 29p/schwassmann-wachmann 1 |
context. asteroid (6478) gault was discovered to exhibit a comet-like tail in observations from december 2018, becoming a new member of the so-called active asteroid population in the main asteroid belt.aims: we seek to investigate the grain properties of the dust ejected from asteroid (6478) gault and to give insight ... | dust properties of double-tailed active asteroid (6478) gault |
context. space weathering is a process that changes the surface of airless planetary bodies. prime space weathering agents are solar wind irradiation and micrometeoroid bombardment. these processes alter planetary reflectance spectra and often modify their compositional diagnostic features.aims: in this work we focused... | comparison of space weathering spectral changes induced by solar wind and micrometeoroid impacts using ion- and femtosecond-laser-irradiated olivine and pyroxene |
two dedicated asteroid rotation-period surveys have been carried out in the r band with ∼20 minute cadence using the intermediate palomar transient factory (iptf) during 2014 january 6-9 and february 20-23. the total survey area covered 174 deg2 in the ecliptic plane. reliable rotation periods for 1438 asteroids are ob... | asteroid spin-rate study using the intermediate palomar transient factory |
the collision of an asteroid with earth can potentially have significant consequences for the human population. the european and united states space agencies (esa and nasa) maintain asteroid hazard lists that contain all known asteroids with a non-zero chance of colliding with the earth in the future. some software too... | on the influence of impact effect modelling for global asteroid impact risk distribution |
many asteroids are likely rubble-piles that are a collection of smaller objects held together by gravity and possibly cohesion. these asteroids are seismically shaken by impacts, which leads to excitation of their constituent particles. as a result it has been suggested that their surfaces and sub-surface interiors may... | the spherical brazil nut effect and its significance to asteroids |
the paper presents a numerical implementation of the gravitational n-body problem with contact interactions between non-spherically shaped bodies. the work builds up on a previous implementation of the code and extends its capabilities. the number of bodies handled is significantly increased through the use of a cuda/g... | a parallel-gpu code for asteroid aggregation problems with angular particles |
context. the interplanetary dust complex is currently understood to be largely the result of dust production from jupiter-family comets, with contributions also from longer-period comets (halley- and oort-type) and collisionally produced asteroidal dust.aims: here we develop a dynamical model of the interplanetary dust... | imem2: a meteoroid environment model for the inner solar system |
mathematical modelling has shown that activity of the geminid meteor shower should rise with time, and that was confirmed by analysis of visual observations 1985-2016. we do not expect any outburst activity of the geminid shower in 2017, even though the asteroid (3200) phaethon has a close approach to earth in december... | increasing geminid meteor shower activity |
the asteroid belt is characterized by an extreme low total mass of material on dynamically excited orbits. the nice model explains many peculiar qualities of the solar system, including the belt's excited state, by invoking an orbital instability between the outer planets. however, previous studies of the nice model's ... | a record of the final phase of giant planet migration fossilized in the asteroid belt's orbital structure |
asteroid phase curves are used to derive fundamental physical properties through the determination of the absolute magnitude h. the upcoming visible legacy survey of space and time (lsst) and mid-infrared near-earth object surveillance mission (neosm) surveys rely on these absolute magnitudes to derive the colours and ... | asteroid phase curves from atlas dual-band photometry |
recent high precision meteoritic data improve constraints on the formation timescale and bulk composition of the terrestrial planets. high resolution n-body simulations allow direct comparison of embryo growth timescale and accretion zones to these constraints. in this paper, we present results of high resolution simul... | growing mars fast: high-resolution gpu simulations of embryo formation |
in 2018 december, the main-belt asteroid (6478) gault was reported to display activity. gault is an asteroid belonging to the phocaea dynamical family and was not previously known to be active, nor was any other member of the phocaea family. in this work, we present the results of photometric and spectroscopic observat... | (6478) gault: physical characterization of an active main-belt asteroid |
context. the cooling history of individual meteorites can be reconstructed if closure temperatures and closure ages of different radioisotopic chronometers are available for a couple of meteorites. if a close similarity in chemical and isotopic composition suggests a common origin from the same parent body, some basic ... | thermal history modelling of the l chondrite parent body |
the implication of small amounts of cohesion within relatively small rubble pile asteroids is investigated with regard to their evolution under the persistent presence of the yorp effect. we find that below a characteristic size, which is a function of cohesive strength, density and other properties, rubble pile astero... | disaggregation of small, cohesive rubble pile asteroids due to yorp |
themis is an old and statistically robust asteroid family populating the outer main belt, and resulting from a catastrophic collision that took place 2.5 ± 1.0 gyr ago. within the old themis family a young sub-family, beagle, formed less than 10 myr ago, has been identified. we present the results of a spectroscopic su... | spectral variability on primitive asteroids of the themis and beagle families: space weathering effects or parent body heterogeneity? |
non-cumulate eucrites represent basaltic crust that experienced a complex thermal history involving multistage metamorphism and metasomatism, probably on asteroid vesta. to better constrain the thermal history of these rocks and their parent body, we have integrated high-precision u-pb age and trace element data for zi... | timing of global crustal metamorphism on vesta as revealed by high-precision u-pb dating and trace element chemistry of eucrite zircon |
the processes that controlled accretion of water and volatiles to the inner solar system remain enigmatic, because it is difficult to determine the absolute concentrations of volatile elements in planetary bodies. in this contribution we study rare unequilibrated eucrites derived from the asteroid 4 vesta, to determine... | the water and fluorine content of 4 vesta |
proposed mineralogical linkages between cm/ci carbonaceous chondrites and outer main belt asteroids remain uncertain due to a dearth of diagnostic absorptions in visible and near-infrared (∼0.4-2.5 μm) spectra of the two sets of objects. absorptions near 3 μm in both sets hold promise for illuminating the potential lin... | toward an understanding of phyllosilicate mineralogy in the outer main asteroid belt |
using infrared (ir) spectroscopy of thin sections, we characterize the relative degree of aqueous alteration and subsequent heating of a suite of cm chondrites to document spectral indicators of these processes that can contextualize observations of carbonaceous asteroids. we find that the progressive aqueous alteratio... | distinguishing relative aqueous alteration and heating among cm chondrites with ir spectroscopy |
carbonaceous chondrites experienced varying degrees of aqueous alteration on their parent asteroids, which influenced their mineralogies, textures, and bulk chemical and isotopic compositions. although this alteration was a crucial event in the history of these meteorites, their various alteration pathways are not well... | constraints on the ice composition of carbonaceous chondrites from their magnetic mineralogy |
the parent cores of iron meteorites belong to the earliest accreted bodies in the solar system. these cores formed in two isotopically distinct reservoirs: noncarbonaceous (nc) type and carbonaceous (cc) type in the inner and outer solar system, respectively. we measured elemental compositions of cc-iron groups and use... | compositions of carbonaceous-type asteroidal cores in the early solar system |
aims: asteroids have been exposed to impacts since their formation, and as a consequence their surfaces are covered by small particles, pebbles, and boulders. the japanese jaxa/isas hayabusa mission collected micron-sized particles from the regolith of asteroid 25143 itokawa. the study in terrestrial laboratories of th... | mechanical properties of particles from the surface of asteroid 25143 itokawa |
we present classical and quantum algorithms for approximating partition functions of classical hamiltonians at a given temperature. our work has two main contributions: first, we modify the classical algorithm of stefankovic, vempala and vigoda (j. acm, 56(3), 2009) to improve its sample complexity; second, we quantize... | simpler (classical) and faster (quantum) algorithms for gibbs partition functions |
recent paleomagnetic studies of allende cv chondrite as well as thermal modeling suggest the existence of partially differentiated asteroids with outer unmelted and variably metamorphosed crusts overlying differentiated interiors. to further constrain the magnetic history of the cv parent body, we report here paleomagn... | new constraints on the magnetic history of the cv parent body and the solar nebula from the kaba meteorite |
the discovery of fast radio burst (frb) 200428 from galactic sgr j1935+2154 makes it possible to measure rotational changes accompanied by frbs and to test several frb models which may be simultaneously associated with glitches. inspired by this idea, we present order of magnitude calculations to the scenarios proposed... | constraining mechanism associated with fast radio burst and glitch from sgr j1935 |
in this investigation, the integrated attitude and landing control scheme for quadruped robots in asteroid landing mission scenario is discussed. compared with the gravitational field environment of the earth, the gravitational field near most asteroids has a smaller gravitational acceleration, a non-negligible horizon... | integrated attitude and landing control for quadruped robots in asteroid landing mission scenarios using reinforcement learning |
the importance of the iot is increasing in every field of life, and it especially has a significant role in improving the efficiency of the healthcare system. its demand further increased during covid-19 to facilitate the patient remotely from their home digitally. every time the covid-19 patient visited the doctor for... | application and challenges of iot healthcare system in covid-19 |
the internal structure of asteroids is still poorly known and has never been analyzed directly by measurements. our knowledge relies entirely on inferences from remote sensing observations of the surface and theoretical modeling. direct measurements are crucial to characterize an asteroid's internal structure and heter... | a radar package for asteroid subsurface investigations: implications of implementing and integration into the mascot nanoscale landing platform from science requirements to baseline design |
this paper tackles the problem of spacecraft relative navigation to support the reach and capture of a passively cooperative space target using a chaser platform equipped with a robotic arm in the frame of future operations such as on orbit servicing and active debris removal. specifically, it presents a pose determina... | monocular-based pose estimation based on fiducial markers for space robotic capture operations in geo |
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