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a pilot numerical model of the geminid meteoroid stream is presented. this model implies cometary origin of the stream. ejection of relatively small amount of particles (90 000 test meteoroids with masses 0.02, 0.003 and 0.0003 g) from the asteroid (3200) phaethon (the parent body) was simulated, and their evolution wa... | a preliminary numerical model of the geminid meteoroid stream |
meteorite magnetizations can provide rare insight into early solar system evolution. such data take on new importance with recognition of the isotopic dichotomy between non-carbonaceous and carbonaceous meteorites, representing distinct inner and outer disk reservoirs, and the likelihood that parent body asteroids were... | arrival and magnetization of carbonaceous chondrites in the asteroid belt before 4562 million years ago |
nasa's lucy mission is designed to better understand the unique population of trojan asteroids. trojans were probably captured in jupiter's l4 and l5 points early in the solar system's evolution and little altered since then. a critical investigation of lucy is to use its highest-resolution camera, the lucy long range ... | imaging lunar craters with the lucy long range reconnaissance imager (l'lorri): a resolution test for nasa's lucy mission |
the origin of fast radio bursts (frbs) is still a mystery. one model proposed to interpret the only known repeating object, frb 121102, is that the radio emission is generated from asteroids colliding with a highly magnetized neutron star (ns). with n-body simulations, we model a debris disc around a central star with ... | investigation of the asteroid-neutron star collision model for the repeating fast radio bursts |
a projectile accelerated by the hayabusa2 small carry-on impactor successfully produced an artificial impact crater with a final apparent diameter of 14.5 ± 0.8 m on the surface of the near-earth asteroid 162173 ryugu on april 5, 2019. at the time of cratering, deployable camera 3 took clear time-lapse images of the ej... | size of particles ejected from an artificial impact crater on asteroid 162173 ryugu |
a recently discovered group of nearby co-orbital objects is an attractive location for extraterrestrial intelligence (eti) to locate a probe to observe earth while not being easily seen. these near-earth objects provide an ideal way to watch our world from a secure natural object. that provides resources an eti might n... | looking for lurkers: co-orbiters as seti observables |
context. planetary debris is observed in the atmospheres of over 1000 white dwarfs, and two white dwarfs are now observed to contain orbiting minor planets. exoasteroids and planetary core fragments achieve orbits close to the white dwarf through scattering with major planets. however, the architectures that allow for ... | driving white dwarf metal pollution through unstable eccentric periodic orbits |
we analyzed data from the first year of a survey for near-earth objects (neos) that we are carrying out with the dark energy camera (decam) on the 4 m blanco telescope at the cerro tololo inter-american observatory. we implanted synthetic neos into the data stream to derive our nightly detection efficiency as a functio... | the size distribution of near-earth objects larger than 10 m |
all life on earth contains amino acids and carbonaceous chondrite meteorites have been suggested as their source at the origin of life on earth. while many meteoritic amino acids are considered indigenous, deciphering the extent of terrestrial contamination remains an issue. the ryugu asteroid fragments (jaxa hayabusa2... | insights into the formation and evolution of extraterrestrial amino acids from the asteroid ryugu |
we report findings from a series of laser-simulated space weathering experiments on allende, a cv3 carbonaceous chondrite. the purpose of these experiments is to understand how spectra of anhydrous c-complex asteroids might vary as a function of micrometeorite bombardment. four 0.5-gram aliquots of powdered, unpacked a... | incremental laser space weathering of allende reveals non-lunar like space weathering effects |
topological defects play a key role in two-dimensional active nematics, and a transient role in two-dimensional active polar fluids. in this paper, we study both the transient and long-time behavior of defects in two-dimensional active polar fluids in the limit of strong order and overdamped, compressible flow, and com... | defect dynamics in active polar fluids vs. active nematics |
we present near-infrared spectroscopy of the sporadically active asteroid (6478) gault collected on the 3 m nasa/infrared telescope facility observatory in late 2019 march/early april. long-exposure imaging with the 0.5 m near earth environment monitoring t05 telescope and previously published data simultaneously monit... | active asteroid (6478) gault: a blue q-type surface below the dust? |
the geminid meteoroid stream and asteroid (3200) phaethon are generally recognized as being associated. it has been claimed that two other asteroids, namely (225416) 1999 yc and (155140) 2005 ud, might be the members of this complex. we aim to study this possibility, with the assumption that their separation happened w... | asteroid (3200) phaethon and the geminid meteoroid stream complex |
we consider a dynamical shake-up model to explain the low mass of mars and the lack of planets in the asteroid belt. in our scenario, a secular resonance with jupiter sweeps through the inner solar system as the solar nebula depletes, pitting resonant excitation against collisional damping in the sun’s protoplanetary d... | terrestrial planet formation: dynamical shake-up and the low mass of mars |
modelling and simulation of collisional particle breakage mechanisms are crucial in several physical phenomena (asteroid belts, molecular clouds, raindrop distribution etc.) and process industries (chemical, pharmaceutical, material etc.). this paper deals with the development and analysis of schemes to numerically sol... | development and analysis of moments preserving finite volume schemes for multi-variate nonlinear breakage model |
the cybele and hilda dynamical groups delimit the outer edge of the asteroid belt. their compositional distribution is a key element to constrain evolutionary models of the solar system. in this paper, we present a compositional analysis of these populations using spectroscopic observations, sdss and neowise data. as p... | primass visits hilda and cybele groups |
the small asteroid itokawa was visited in 2005 by the japanese spacecraft hayabusa. the images of the surface showed a scenario different to previously visited asteroids. itokawa has a small number of large craters and many large boulders randomly distributed on most of the surface. we analyse images taken at different... | distribution of boulders and the gravity potential on asteroid itokawa |
we describe a novel data-processing and analysis pipeline for optical observations of moving objects, either of natural (asteroids, meteors) or artificial origin (satellites, space debris). the monitoring of the space object populations requires reliable acquisition of observational data, to support the development and... | streak detection and analysis pipeline for space-debris optical images |
from preliminary 2010-2011 results of the cameras for allsky meteor surveillance (cams) meteoroid orbit survey, which were combined with published 2007-2009 sonotaco video meteor network data, 55 new meteor showers (##448-502) were identified and added to the iau working list on meteor showers in 2012. these showers we... | cams verification of single-linked high-threshold d-criterion detected meteor showers |
this paper presents an overview of space mission concepts for disrupting or pulverizing hazardous asteroids, especially with warning time shorter than approximately 10 years. an innovative mission concept, referred to as a nuclear hypervelocity asteroid intercept vehicle (haiv) system, employs both a kinetic-energy imp... | planetary defense mission concepts for disrupting/pulverizing hazardous asteroids with short warning time |
by means of extensive three-dimensional contact dynamics simulations, we analyze the strength properties and microstructure of a granular asteroid, modeled as a self-gravitating cohesive granular aggregate composed of spherical particles, and subjected to diametrical compression tests. we show that, for a broad range o... | scaling behavior of cohesive self-gravitating aggregates |
jovian co-orbitals share jupiter's orbit in 1:1 mean motion resonance. this includes $>$10,000 so-called trojan asteroids surrounding the leading (l4) and trailing (l5) lagrange points, viewed as stable groups dating back to planet formation. via a massive numerical study we identify for the first time some trojans ... | jupiter's metastable companions |
the metal budgets in some white dwarf (wd) atmospheres reveal that volatile-rich circumstellar bodies must both exist in extrasolar systems and survive the giant branch phases of stellar evolution. the resulting behaviour of these active asteroids or comets which orbit wds is not well-understood, but may be strongly in... | sublimation-induced orbital perturbations of extrasolar active asteroids and comets: application to white dwarf systems |
using our photometric observations taken between april 1996 and january 2013 and other published data, we derived properties of the binary near-earth asteroid (175706) 1996 fg3 including new measurements constraining evolution of the mutual orbit with potential consequences for the entire binary asteroid population. we... | the binary near-earth asteroid (175706) 1996 fg3 - an observational constraint on its orbital evolution |
the nature of the early martian climate has been the subject of debate for decades, with geologic evidence suggesting an environment with prolonged precipitation and flowing liquid water on the surface, while climate models have struggled to reproduce such conditions. in this paper, we test the impact heating hypothesi... | testing the impact heating hypothesis for early mars with a 3-d global climate model |
the double asteroid redirection test (dart) mission will be the first test of a kinetic impactor as a means of planetary defense. in late 2022, dart will collide with dimorphos, the secondary in the didymos binary asteroid system. the impact will cause a momentum transfer from the spacecraft to the binary asteroid, cha... | libration-induced orbit period variations following the dart impact |
several pieces of evidence suggest that silicate grains in primitive meteorites are not interstellar grains but condensates formed in the early solar system. moreover, the size distribution of matrix grains in chondrites implies that these condensates might be formed as nanometer-sized grains. therefore, we propose a n... | rocky planetesimal formation via fluffy aggregates of nanograins |
large language models (llms) have acquired ubiquitous attention for their performances across diverse domains. our study here searches through llms' cognitive abilities and confidence dynamics. we dive deep into understanding the alignment between their self-assessed confidence and actual performance. we exploit these ... | the confidence-competence gap in large language models: a cognitive study |
we present deep imaging observations, orbital dynamics, and dust-tail model analyses of the double-component asteroid p/2016 j1 (j1-a and j1-b). the observations were acquired at the gran telescopio canarias (gtc) and the canada-france-hawaii telescope (cfht) from mid-march to late july of 2016. a statistical analysis ... | the splitting of double-component active asteroid p/2016 j1 (panstarrs) |
recent observations of water emission around ceres suggest the presence of an ice layer on or beneath the surface of this asteroid. several mechanisms have been suggested to explain these plumes, among which cometary-like sublimation seems to be plausible, since there is a correlation between the magnitude of the emiss... | ceres water regime: surface temperature, water sublimation and transient exo(atmo)sphere |
the origin of the jupiter trojan asteroids has long been a mystery. dynamically, the population, which is considerably smaller than the main asteroid belt, librates around jupiter's stable l4 and l5 lagrange points, 60 deg ahead and behind jupiter. it is thought that these bodies were captured into these orbits early i... | origin and evolution of jupiter's trojan asteroids |
the jaxa astromaterials science research group developed a web-based database system for the hayabusa2-returned samples from c-type asteroid ryugu. the ryugu sample database system database (rs-dbs) is designed as an online catalog for users of wide scientific communities to choose their preferred samples and propose t... | ryugu sample database system (rs-dbs) on the data archives and transmission system (darts) by the jaxa curation |
we present fully covered phased light curves for 56 jovian trojan asteroids as observed by the k2 mission of the kepler space telescope. this set of objects has been monitored during campaign 6 and represents a nearly unbiased subsample of the population of small solar system bodies. we derived precise periods and ampl... | the heart of the swarm: k2 photometry and rotational characteristics of 56 jovian trojan asteroids |
context. apart from thousands of "regular" exoplanet candidates, kepler satellite has discovered a small number of stars exhibiting peculiar eclipse-like events. they are most probably caused by disintegrating bodies transiting in front of the star. however, the nature of the bodies and obscuration events, such as thos... | mysterious eclipses in the light curve of kic8462852: a possible explanation |
the hamburg (h4) meteorite fell on 17 january 2018 at 01:08 ut approximately 10 km north of ann arbor, michigan. more than two dozen fragments totaling under 1 kg were recovered, primarily from frozen lake surfaces. the fireball initial velocity was 15.83 ± 0.05 km s-1, based on four independent records showing the fir... | the hamburg meteorite fall: fireball trajectory, orbit, and dynamics |
the crusts of the oldest protoplanets are virtually unknown due to the scarcity of samples. here, we describe the oldest known lava that crystallized ca. 4,565 ma ago and formed by partial melting of a chondritic parent body. 26al-26mg systematics suggest that the elapsed time between melting and crystallization was si... | a 4,565-my-old andesite from an extinct chondritic protoplanet |
advancements in space exploration and sample return technology present a unique opportunity to leverage sample return capsules (srcs) towards studying atmospheric entry of meteoroids and asteroids. specifically engineered for the secure transport of valuable extraterrestrial samples from interplanetary space to earth, ... | a review of infrasound and seismic observations of sample return capsules since the end of the apollo era in anticipation of the osiris-rex arrival |
samples from the carbonaceous asteroid (162173) ryugu provide information on the chemical evolution of organic molecules in the early solar system. here we show the element partitioning of the major component ions by sequential extractions of salts, carbonates, and phyllosilicate-bearing fractions to reveal primordial ... | chemical evolution of primordial salts and organic sulfur molecules in the asteroid 162173 ryugu |
in 2010 jewitt and li published a paper examining the behavior of "comet-asteroid transition object" 3200 phaethon, arguing it was asteroid-like in its behavior throughout most of its orbit, but that near its perihelion, at a distance of only 0.165 au from the sun, its dayside temperatures would be hot enough to vapori... | thermal alteration and differential sublimation can create phaethon\'s "rock comet" activity and blue color |
the geminids meteoroid stream produces one of the most intense meteor showers at earth. it is an unusual stream in that its parent body is understood to be an asteroid, (3200) phaethon, unlike most streams, which are formed via ongoing cometary activity. until recently, our primary understanding of this stream came fro... | formation, structure, and detectability of the geminids meteoroid stream |
on october 4, 1957, homo sapiens crossed a new threshold of technological innovation after constructing an artifact capable of entering low earth orbit and effectively paving the way for a future of space exploration. this artifact was sputnik 1, launched by the soviet space program which triggered the "space race" of ... | planetary geoarchaeology as a new frontier in archaeological science: evaluating site formation processes on earth's moon |
context. most small asteroids (< 50 km in diameter) are the result of the breakup of a larger parent body and are often considered to be rubble-pile objects. similar structures are expected for the secondaries of small asteroid binaries, including dimorphos, the smaller component of the 65 803 didymos binary system ... | reshaping and ejection processes on rubble-pile asteroids from impacts |
the origins, spectral interpretation, resource identification, and security-regolith explorer (osiris-rex) spacecraft orbited the near-earth asteroid (101955) bennu to characterize the asteroid prior to sampling. one important aspect of this characterization was the creation of a high-resolution (5-7 cm) global shape m... | building a high-resolution digital terrain model of bennu from laser altimetry data |
if very low mass primordial black holes (pbh) within the asteroid/moon-mass range indeed reside in galactic dark matter halos, they must necessarily collide with galactic neutron stars (nss). these collisions must, again necessarily, form light black holes (lbhs) with masses of typical nss, m lbh ≈ 1-2 m ⊙. lbhs may be... | a robust test of the existence of primordial black holes in galactic dark matter halos |
we describe the ambition project, a mission to return the first-ever cryogenically-stored sample of a cometary nucleus, that has been proposed for the esa science programme voyage 2050. comets are the leftover building blocks of giant planet cores and other planetary bodies, and fingerprints of solar system's formation... | ambition - comet nucleus cryogenic sample return |
we present a technique for verifying or refuting exoplanet candidates from the transiting exoplanet survey satellite (tess) mission by searching for nearby eclipsing binary stars using higher-resolution archival images from ground-based telescopes. our new system is called detecting and evaluating a transit: finding it... | deathstar: a system for confirming planets and identifying false positive signals in tess data using ground-based time domain surveys |
this is an overview of recent research on meteors and the parent bodies from which they are produced. while many meteor showers result from material ejected by comets, two out of the three strongest annual showers (the geminids and the quadrantids) are associated with objects whose physical properties are apparently th... | asteroid-meteoroid complexes |
the samples returned from asteroid ryugu were collected both at its surface and at its subsurface by hayabusa2 and can, thus, provide information on the space weathering of c-type asteroids at different depths without terrestrial contamination. the near-infrared hyperspectral microscope micromega gathered data on the -... | space weathering record and pristine state of ryugu samples from micromega spectral analysis |
top-shaped asteroids have been observed among near-earth asteroids. about half of them are reported to have moons (on the order of ~1 wt.% of the top-shaped primary) and many of them have an equatorial ridge. a recent study has shown that the enigmatic top-shaped figure of asteroids (e.g., ryugu, bennu, and didymos) co... | formation of moons and equatorial ridge around top-shaped asteroids after surface landslide |
we present heliolinc, a novel approach to the minor planet linking problem. our heliocentric transformation-and-propagation algorithm clusters tracklets at common epochs, allowing for the efficient identification of tracklets that represent the same minor planet. this algorithm scales as { \mathcal o }(n{log}n) with th... | heliolinc: a novel approach to the minor planet linking problem |
it is now widely accepted that the asteroid 4-vesta has an fe-rich metallic core, but the composition of the core and the conditions prevailing during core-mantle differentiation are poorly constrained. in light of new constraints on vesta's geophysical and geochemical properties obtained by the dawn mission, we have r... | constraints on core formation in vesta from metal-silicate partitioning of siderophile elements |
planetary surfaces can be complex mixtures of coarse and fine particles that exhibit linear and nonlinear mixing behaviors at mid-infrared (mir) wavelengths. machine learning multivariate analysis can estimate modal mineralogy of mixtures and is favorable because it does not assume linear mixing across wavelengths. we ... | machine learning mid-infrared spectral models for predicting modal mineralogy of ci/cm chondritic asteroids and bennu |
the past decade has brought major improvements in large-scale asteroid discovery and characterization, with over half a million known asteroids, more than 100,000 of which have some measurement of physical characterization. this explosion of data has allowed us to create a new global picture of the main asteroid belt. ... | the compositional structure of the asteroid belt |
aims: the primary objective of this study is to utilize gaia dr3 asteroid astrometry to detect the yarkovsky effect, a non-gravitational acceleration that affects the orbits of small asteroids. we then computed the bulk densities for the sample of objects for which we obtained an estimation of the yarkovsky effect.meth... | the yarkovsky effect and bulk density of near-earth asteroids from gaia dr3 |
cm carbonaceous chondrites can be used to constrain the abundance and h isotopic composition of water and oh in c-complex asteroids. previous measurements of the water/oh content of the cms are at the higher end of the compositional range of asteroids as determined by remote sensing. one possible explanation is that th... | the water content of cm carbonaceous chondrite falls and finds, and their susceptibility to terrestrial contamination |
carbonaceous chondrites contain widespread mineralogical evidence for water-rock interactions, indicating that the c-type asteroids from which they are derived had active hydrothermal systems. in comparison, ordinary chondrites contain secondary minerals that are predominantly anhydrous, suggesting that their parent s-... | hydrothermal fluid activity on asteroid itokawa |
designing optimal transfer trajectories and reference orbit tracking in binary asteroid systems is both challenging and computationally expensive. this paper proposes a method of bypassing the high computational overhead by leveraging a collection of known techniques. indeed, the proposed framework is based on the comb... | optimal maneuvers around binary asteroids using particle swarm optimization and machine learning |
we modeled the geometry and the three-dimensional orientation of the ejecta cone triggered by the impact of the dart spacecraft on the asteroid dimorphos. we used eight luke images of the impact acquired by the cubesat liciacube that flew by the didymos system shortly after the impact. these images, which show the ejec... | characterization of the dart impact ejecta plume on dimorphos from liciacube observations |
hayabusa2 is a japanese sample return mission from the asteroid ryugu. the hayabusa2 spacecraft was launched on 3 december 2014 and arrived at ryugu on 27 june 2018. it stayed there until december 2019 for in situ observation and soil sample collection, and will return to the earth in november or december 2020. during ... | guidance, navigation, and control of hayabusa2 touchdown operations |
certain debris disks have nonaxisymmetric shapes in scattered light which are unexplained. the appearance of a disk depends on how its constituent keplerian ellipses are arranged. the more the ellipses align apsidally, the more nonaxisymmetric the disk. apsidal alignment is automatic for fragments released from a catas... | giant impacts and debris disk morphology |
we present an observational and dynamical study of newly discovered main-belt comet 313p/gibbs. we find that the object is clearly active both in observations obtained in 2014 and in precovery observations obtained in 2003 by the sloan digital sky survey, strongly suggesting that its activity is sublimation-driven. thi... | sublimation-driven activity in main-belt comet 313p/gibbs |
the surfaces of many planets and asteroids contain coarsely fragmental material generated by impacts or other geologic processes. the presence of such pre-existing structures may affect subsequent impacts, particularly when the width of the shock is comparable to or smaller than the size of pre-existing structures. rea... | impacts into coarse-grained spheres at moderate impact velocities: implications for cratering on asteroids and planets |
we present results from a suite of 169 hydrocode simulations of collisions between planetary bodies with radii from 100 to 1000 km. the simulation data are used to derive a simple scaling law for the threshold for catastrophic disruption, defined as a collision that leads to half the total colliding mass escaping the s... | impact disruption of gravity-dominated bodies: new simulation data and scaling |
how do planetary scientists analyze and interpret data from laboratory, telescopic, and spacecraft observations of planetary surfaces? what elements, minerals, and volatiles are found on the surfaces of our solar system's planets, moons, asteroids, and comets? this comprehensive volume answers these topical questions b... | remote compositional analysis: techniques for understanding spectroscopy, mineralogy, and geochemistry of planetary surfaces. |
linear dunes are among the world's most common desert dune types, and typically occur in dunefields arranged in remarkably organized patterns extending over hundreds of kilometers. the causes of the patterns, formed by dunes merging, bifurcating and terminating, are still poorly understood, although it is widely accept... | automated mapping of linear dunefield morphometric parameters from remotely-sensed data |
recycling opportunities for graphitic carbon from lithium-ion battery (lib) anodes have been neglected owing to the relative low value of application. in this study, the potential methods for removing toxic metals (lead, barium, and cadmium) and organic compounds (2,4-dinitrotoluene [dnt], 2,4,6-trinitrotoluene [tnt], ... | anode carbonaceous material recovered from spent lithium-ion batteries in electric vehicles for environmental application |
examining the functional response of predators can provide insight into the role of predation in structuring prey populations and ecological communities. this study explored feeding behaviour and functional responses of planktivorous damselfishes when offered captive reared larvae of crown-of-thorns starfish, acanthast... | predation on crown-of-thorns starfish larvae by damselfishes |
various simplified models have been investigated as a way to understand the complex dynamical environment near irregular asteroids. a dipole segment model is explored in this paper, one that is composed of a massive straight segment and two point masses at the extremities of the segment. given an explicitly simple form... | the dipole segment model for axisymmetrical elongated asteroids |
many debris discs reveal a two-component structure, with a cold outer and a warm inner component. while the former are likely massive analogues of the kuiper belt, the origin of the latter is still a matter of debate. in this work, we investigate whether the warm dust may be a signature of asteroid belt analogues. in t... | does warm debris dust stem from asteroid belts? |
the spacecraft hayabusa2 was launched on december 3, 2014, to collect and return samples from a c-type asteroid, 162173 ryugu (provisional designation, 1999 ju3). it is expected that the samples collected contain organic matter and water-bearing minerals and have key information to elucidate the origin and history of t... | hayabusa2 sample catcher and container: metal-seal system for vacuum encapsulation of returned samples with volatiles and organic compounds recovered from c-type asteroid ryugu |
aimusing three north american species invading europe (aster novi‑belgii, lupinus polyphyllus and solidago canadensis) and three european species invading north america (agrostis capillaris, bromus tectorum and cirsium arvense), we tested (1) whether the dominant species impact differs between its native and invaded ra... | dominance has a biogeographical component: do plants tend to exert stronger impacts in their invaded rather than native range? |
this study explores the petrology of five giant (>400 μm) hydrated fine-grained micrometeorites from the transantarctic mountain (tam) micrometeorite collection. for the first time, the extent and mechanisms of aqueous alteration in unmelted cosmic dust are evaluated and quantified. we use a range of criteria, previ... | intense aqueous alteration on c-type asteroids: perspectives from giant fine-grained micrometeorites |
insoluble organic matter (iom) is the major organic component of chondritic meteorites and may be akin to organic materials from comets and interplanetary dust particles (idps). reflectance spectra of iom in the range 0.35-25 μm are presented as a tool for interpreting organic chemistry from remote measurements of aste... | reflectance spectroscopy of insoluble organic matter (iom) and carbonaceous meteorites |
identification of linear features (streaks) in astronomical images is important for several reasons, including: detecting fast-moving near-earth asteroids; detecting or flagging faint satellites streaks; and flagging or removing diffraction spikes, pixel bleeding, line-like cosmic rays and bad-pixel features. here we d... | optimal and efficient streak detection in astronomical images |
context. determining the source regions of meteorites is one of the major goals of current research in planetary science. whereas asteroid observations are currently unable to pinpoint the source regions of most meteorite classes, observations of meteors with camera networks and the subsequent recovery of the meteorite... | probing the use of spectroscopy to determine the meteoritic analogues of meteors |
the polar cold traps of mercury host an estimated 1016-1018 g of water ice. the relative purity of the water-ice deposits could indicate they were emplaced over a short time interval, and sharp albedo boundaries suggest that the water ice could have been emplaced relatively recently. together, these lines of evidence a... | examining the potential contribution of the hokusai impact to water ice on mercury |
context. the rotation states of small asteroids are affected by a net torque arising from an anisotropic sunlight reflection and thermal radiation from the asteroids' surfaces. on long timescales, this so-called yorp effect can change asteroid spin directions and their rotation periods.aims: we analyzed lightcurves of ... | yorp and yarkovsky effects in asteroids (1685) toro, (2100) ra-shalom, (3103) eger, and (161989) cacus |
context. co-orbital bodies are the byproduct of planet formation and evolution, as we know from the solar system. although planet-size co-orbitals do not exists in our planetary system, dynamical studies show that they can remain stable for long periods of time in the gravitational well of massive planets. should they ... | the troy project. ii. multi-technique constraints on exotrojans in nine planetary systems |
the distributions of size and chemical composition in regolith on airless bodies provide clues to the evolution of the solar system. recently, the regolith on asteroid (25143) itokawa, visited by the jaxa hayabusa spacecraft, was observed to contain millimeter to centimeter sized particles. itokawa boulders commonly di... | the origins of asteroidal rock disaggregation: interplay of thermal fatigue and microstructure |
s. r. kulkarni on behalf of the zwicky transient facility (ztf) announces the first confirmed results from the project. ztf is led by the california institute of technology, us and includes ipac, us; los alamos national laboratory, us; university of maryland, us; university of wisconsin at milwaukee, us; university of ... | the zwicky transient facility (ztf) begins |
the alos world 3d - 30&thinsp;m (aw3d30), aster global dem version 2 (gdem2), and srtm-30&thinsp;m are digital elevation models (dems) that have been made available to the general public free of charge. an important feature of these dems is their unprecedented horizontal resolution of 30-m and almost global cov... | vertical accuracy assessment of 30-m resolution alos, aster, and srtm global dems over northeastern mindanao, philippines |
context. earlier work suggests that slowly rotating asteroids should have higher thermal inertias than faster rotators because the heat wave penetrates deeper into the subsurface. however, thermal inertias have been determined mainly for fast rotators due to selection effects in the available photometry used to obtain ... | thermal properties of slowly rotating asteroids: results from a targeted survey |
we report on a multiobservatory campaign to examine asteroid 3200 phaethon during its 2017 december close approach to earth, in order to improve our measurements of its fundamental parameters, and to search for surface variations, cometary activity, and fragmentation. the mean colors of phaethon are b - v = 0.702 ± 0.0... | asteroid (3200) phaethon: colors, phase curve, limits on cometary activity, and fragmentation |
we develop a fourth-order numerical integrator to simulate the coupled spin and orbital motions of two rigid bodies having arbitrary mass distributions under the influence of their mutual gravitational potential. we simulate the dynamics of components in well-characterized binary and triple near-earth asteroid systems ... | near-earth asteroid satellite spins under spin-orbit coupling |
we investigate numerically, by a hybrid lattice boltzmann method, the morphology and the dynamics of an emulsion made of a polar active gel, contractile or extensile, and an isotropic passive fluid. we focus on the case of a highly off-symmetric ratio between the active and passive components. in absence of any activit... | morphology and flow patterns in highly asymmetric active emulsions |
the formation of planetesimals was a key step in the assemblage of planetary bodies, yet many aspects of their formation remain poorly constrained. notably, the mechanism by which chondrules-submillimetric spheroids that dominate primitive meteorites-were incorporated into planetesimals remains poorly understood. here ... | constraints on planetesimal accretion inferred from particle-size distribution in co chondrites |
we study the optical properties of the solar gravitational lens (sgl) while treating the sun as an extended, axisymmetric and rotating body. the gravitational field of the sun is represented using a set of zonal harmonics. we develop an analytical description of the intensity of light that is observed in the image plan... | imaging point sources with the gravitational lens of an extended sun |
the growth of small planetesimals into large planetary embryos occurs far before the dispersal of the gas from the protoplanetary disk. the planetesimal-gaseous disk interactions give rise to migration and orbital evolution of the planetesimals/planets. small planetesimals are dominated by aerodynamic gas drag. large p... | application of gas dynamical friction for planetesimals. i. evolution of single planetesimals |
while having a comet-like appearance, p/2012 f5 (gibbs) has an orbit native to the main asteroid belt, and physically is a km-sized asteroid which recently (mid 2011) experienced an impulsive mass ejection event. here we report new observations of this object obtained with the keck ii telescope on ut 2014 august 26. th... | fast rotation and trailing fragments of the active asteroid p/2012 f5 (gibbs) |
understanding the collisional fragmentation and subsequent reaccumulation of fragments is crucial for studies of the formation and evolution of the small-body populations. using an sph / n-body approach, we investigate the size-frequency distributions (sfds) resulting from the disruption of 100 km-diameter targets cons... | fragment properties from large-scale asteroid collisions: i: results from sph/n-body simulations using porous parent bodies and improved material models |
a discontinuous galerkin time-domain (dgtd) method based on dynamically adaptive cartesian meshes (acm) is developed for a full-wave analysis of electromagnetic fields in dispersive media. hierarchical cartesian grids offer simplicity close to that of structured grids and the flexibility of unstructured grids while bei... | a discontinuous galerkin time-domain method with dynamically adaptive cartesian mesh for computational electromagnetics |
context. meteoroid streams are fragments of matter produced by comets or asteroids which intersects the orbit of earth. meteor showers are produced when earth intersects these streams of matter. the discoveries of active asteroids and extinct comets open a new view of the relation between these objects as possible pare... | association between meteor showers and asteroids using multivariate criteria |
aims: we perform light curve inversion for 491 asteroids to retrieve phase curve parameters, rotation periods, pole longitudes and latitudes, and convex and triaxial ellipsoid shapes by using the sparse photometric observations from gaia data release 2 and the dense ground-based observations from the damit database. we... | asteroid absolute magnitudes and phase curve parameters from gaia photometry |
jan hendrik oort hypothesized the existence of a distant cloud of cometary objects that orbit the sun based on a spike in the reciprocal orbital separation at 1∕a ≲ 10−4 au−1. the oort cloud is the source of long-period comets, but has not been observed directly, and its origin remains theoretical. theories on its orig... | oort cloud ecology. ii. the chronology of the formation of the oort cloud |
composition of terrestrial planets records planetary accretion, core-mantle and crust-mantle differentiation, and surface processes. here we compare the compositional models of earth and mars to reveal their characteristics and formation processes. earth and mars are equally enriched in refractory elements (1.9 $\times... | earth and mars – distinct inner solar system products |
we present diameters and albedos computed for the near-earth and main belt asteroids (mbas) observed by the near-earth object wide-field infrared survey explorer (neowise) spacecraft during the sixth and seventh years of its reactivation mission. these diameters and albedos are calculated from fitting thermal models to... | asteroid diameters and albedos from neowise reactivation mission years six and seven |
the polana-eulalia family complex is located in the inner part of the asteroid belt, bounded by the ν6 and the 3:1 resonances, where we can find another three collisional families of primitive asteroids (erigone, clarissa, and sulamitis), and a low-albedo population of background objects. this region of the belt is bel... | visible spectroscopy of the polana-eulalia family complex: spectral homogeneity |
metallic potassium (k) is a desirable anode for potassium secondary batteries due to its low electrode potential in nonaqueous electrolytes and high theoretical capacity. nevertheless, instability caused by dendritic growth, large volume changes, and parasitic side reactions hamper its practical application. here, an a... | capillary encapsulation of metallic potassium in aligned carbon nanotubes for use as stable potassium metal anodes |
a method for computing the components of the euler-poinsot tensors up to the fourth order in the expansion of the gravitational potential is described. the results are illustrated by the example of asteroid 433 eros. | computation of attraction potential of asteroid (433) eros with an accuracy up to the terms of the fourth order |
generally, terrestrial rocks, martian and chondritic meteorites exhibit a relatively narrow range in bulk and apatite cl isotope compositions, with δ37cl (per mil deviation from standard mean ocean chloride) values between -5.6 and +3.8‰. lunar rocks, however, have more variable bulk and apatite δ37cl values, ranging f... | investigating magmatic processes in the early solar system using the cl isotopic systematics of eucrites |
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