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tidal flats on the north coast of vietnam suffer diurnal tide with a tide range varying between 0.3 m and 3.5 m. along the 350 km long coastline, the diversity of environmental conditions induces various tidal flats with different characteristics. this study applies the waterline method for multi-temporal satellite ima... | an optimal waterline approach for studying tidal flat morphological changes using remote sensing data: a case of the northern coast of vietnam |
we combine photometry of eris from a 6 month campaign on the palomar 60 inch telescope in 2015, a 1 month hubble space telescope wfc3 campaign in 2018, and dark energy survey data spanning 2013-2018 to determine a light curve of definitive period 15.771 ± 0.008 days (1σ formal uncertainties), with nearly sinusoidal sha... | synchronous rotation in the (136199) eris-dysnomia system |
the rare ci carbonaceous chondrites are the most aqueously altered and chemically primitive meteorites but due to their porous nature and high abundance of volatile elements are susceptible to terrestrial weathering. the ivuna meteorite, type specimen for the ci chondrites, is the largest twentieth-century ci fall and ... | terrestrial modification of the ivuna meteorite and a reassessment of the chemical composition of the ci type specimen |
the geostationary lightning mapper (glm) instrument onboard the goes 16 and 17 satellites can be used to detect bolides in the atmosphere. this capacity is unique because glm provides semi-global, continuous coverage and releases its measurements publicly. here, six filters are developed that are aggregated into an aut... | an algorithmic approach for detecting bolides with the geostationary lightning mapper |
ongoing spectroscopic reconnaissance of the osiris-rex target asteroid (101955) bennu was performed in july 2011 and may 2012. near-infrared spectra taken during these apparitions display slightly more positive ("redder") spectral slopes than most previously reported measurements. while observational systematic effects... | spectral slope variations for osiris-rex target asteroid (101955) bennu: possible evidence for a fine-grained regolith equatorial ridge |
asteroid (2) pallas is the largest main-belt object not yet visited by a spacecraft, making its surface geology largely unknown and limiting our understanding of its origin and collisional evolution. previous ground-based observational campaigns returned different estimates of its bulk density that are inconsistent wit... | the violent collisional history of aqueously evolved (2) pallas |
the finding by the osiris-rex (origins, spectral interpretation, resource identification, and security-regolith explorer) mission that its target (101955) bennu is an active asteroid has raised questions as to whether the observed particle ejection events are driven by temperature. to investigate sublimation of water i... | implications for ice stability and particle ejection from high-resolution temperature modeling of asteroid (101955) bennu |
micrometeoroid bombardments are one of the causes of space weathering on airless bodies. we have simulated micrometeoroid bombardments on the surfaces of c-type asteroids by pulse-laser irradiation experiments on murchison cm2 chondrite samples. in this letter, we focus in particular on the effect of lower-energy irrad... | space weathering simulation with low-energy laser irradiation of murchison cm chondrite for reproducing micrometeoroid bombardments on c-type asteroids |
lake el'gygytgyn in far east russia is a 3.6 myr old impact crater lake. located in an area that has never been affected by cenozoic glaciations nor desiccation, the unique sediment record of the lake represents the longest continuous sediment archive of the terrestrial arctic. the surrounding crater is the only impact... | impact processes, permafrost dynamics, and climate and environmental variability in the terrestrial arctic as inferred from the unique 3.6 myr record of lake el'gygytgyn, far east russia - a review |
abiotic synthesis of biomolecules is an essential step for the chemical origin of life. many attempts have succeeded in synthesizing biomolecules, including amino acids and nucleobases (e.g., via spark discharge, impact shock, and hydrothermal heating), from reduced compounds that may have been limited in their availab... | impact-induced amino acid formation on hadean earth and noachian mars |
we report on the mineralogy, petrology, and in situ measured oxygen-isotope compositions of three fluffy type a ca,al-rich inclusions (fta cais) and two amoeboid olivine aggregates (aoas) from the cv3.1 carbonaceous chondrite kaba. the fta cais are aggregates of several inclusions composed of spinel, al,ti-diopside, an... | evidence for oxygen-isotope exchange in refractory inclusions from kaba (cv3.1) carbonaceous chondrite during fluid-rock interaction on the cv parent asteroid |
cm chondrites are the most common type of hydrated meteorites, making up ∼1.5% of all falls. whereas most cm chondrites experienced only low-temperature (∼0°c-120°c) aqueous alteration, the existence of a small fraction of cm chondrites that suffered both hydration and heating complicates our understanding of the early... | compositional homogeneity of cm parent bodies |
the dwarf planet ceres (diameter 939 km) is the largest object in the main asteroid belt. recent investigations suggest that ceres is a thermally evolved, volatile-rich body with potential geological activity, a body which was never completely molten but possibly differentiated into a rocky core, an ice-rich mantle, an... | evolution of occator crater on (1) ceres |
exploratory missions to investigate accessible near earth asteroids (neas) can benefit from leveraging dynamics associated with a solar sail-based spacecraft. as a part of this effort, nea scout is a solar sail mission designed to propel a 6u cubesat by harnessing solar radiation pressure from the sun. the spacecraft w... | high-fidelity contingency trajectory design and analysis for nasa's near-earth asteroid (nea) scout solar sail mission |
fifteen h, l, and ll ordinary chondrites of petrologic types 4-6 have been analyzed for hf-w isotope systematics to constrain the chronology, internal structure, and thermal history of their parent bodies. for most samples coarse-grained metals plot below the isochrons defined by silicate-dominated fractions which cons... | hf-w chronology of ordinary chondrites |
the caltech high-speed multi-colour camera (chimera) is a new instrument that has been developed for use at the prime focus of the hale 200-inch telescope. simultaneous optical imaging in two bands is enabled by a dichroic beam splitter centred at 567 nm, with sloan u' and g' bands available on the blue arm and sloan r... | chimera: a wide-field, multi-colour, high-speed photometer at the prime focus of the hale telescope |
asteroids and other small solar system bodies (sssbs) are of high general and scientific interest in many aspects. the origin, formation, and evolution of our solar system (and other planetary systems) can be better understood by analysing the constitution and physical properties of small bodies in the solar system. cu... | small solar system bodies as granular media |
context. when we wish to understand planetesimal formation, the only data set we have is our own solar system. the solar system is particularly interesting because so far, it is the only planetary system we know of that developed life. understanding the conditions under which the solar nebula evolved is crucial in orde... | constraining the parameter space for the solar nebula. the effect of disk properties on planetesimal formation |
(60558) 174p/echeclus is an unusual object that belongs to a class of minor planets called centaurs, which may be intermediate between kuiper belt objects and jupiter family comets. it is sporadically active throughout its orbit at distances too far for water ice, the source of activity for most comets, to sublimate. t... | carbon monoxide in the distantly active centaur (60558) 174p/echeclus at 6 au |
northwest africa (nwa) 7325 is an ungrouped achondrite that has recently been recognized as a sample of ancient differentiated crust from either mercury or a previously unknown asteroid. in this work we augment data from previous investigations on petrography and mineral compositions, mid-ir spectroscopy, and oxygen is... | petrogenesis and provenance of ungrouped achondrite northwest africa 7325 from petrology, trace elements, oxygen, chromium and titanium isotopes, and mid-ir spectroscopy |
periodic orbits are important keys to understand the motion of a massless particle in the vicinity of a binary asteroid system. due to the complex gravity generated by the irregular-shaped asteroids, it is difficult to generate periodic orbits with an analytical method, except with the linearized dynamics in a small re... | global search for periodic orbits in the irregular gravity field of a binary asteroid system |
context. the nasa origins, spectral interpretation, resource identification, and security-regolith explorer (osiris-rex) mission has obtained thousands of spectra of asteroid (101955) bennu with the osiris-rex visible and infrared spectrometer.aims: we present a spectral search for minor absorption bands and determine ... | weak spectral features on (101995) bennu from the osiris-rex visible and infrared spectrometer |
secular oscillations in multiplanet systems can drive chaotic evolution of a small inner body through non-linear resonant perturbations. this 'secular chaos' readily pushes the inner body to an extreme eccentricity, triggering tidal interactions or collision with the central star. we present a numerical study of secula... | secular chaos in white dwarf planetary systems: origins of metal pollution and short-period planetary companions |
aims: the goal of this study is to simulate space weathering processes on primitive bodies. we use ion implantation as a simulation of solar wind irradiation, which has been suggested by several authors to be the major component of space weathering on main belt asteroids. the laboratory analogs we irradiate and analyze... | ion irradiation of the murchison meteorite: visible to mid-infrared spectroscopic results |
the hopping dynamics of a lander in single-tidal-locked binary asteroid systems is explored. a coupled orbit-attitude dynamical model of the lander in the body-fixed frame of the secondary is established by considering the non-spherical perturbations from the two bodies. as an approximate model, the binary system is tr... | natural landing dynamics near the secondary in single-tidal-locked binary asteroids |
aims: we present a library of low-resolution meteor spectra that includes sporadic meteors, members of minor meteor showers, and major meteor showers. these meteors are in the magnitude range from +2 to -3, corresponding to meteoroid sizes from 1 mm to 10 mm.methods: parallel double-station video observations allowed u... | catalogue of representative meteor spectra |
rubble pile asteroids such as (162173) ryugu have large bulk porosities, which are believed to result from void spaces in between the constituent boulders (macroporosity) as well as void spaces within the boulders themselves (microporosity). in general, both macroporosity and microporosity are estimated based on compar... | macroporosity and grain density of rubble pile asteroid (162173) ryugu |
the dynamical environment in the close-proximity of small celestial bodies is characterized by a very weak and irregular gravity field. in this low-acceleration deep-space environment, small dynamical perturbations might affect significantly the dynamics of a spacecraft hovering near the surface of such objects. this p... | trajectory options for hera's milani cubesat around (65803) didymos |
pinpoint landing is challenging for future mars and asteroid exploration missions. vision-based navigation scheme based on feature detection and matching is practical and can achieve the required precision. however, existing algorithms are computationally prohibitive and utilize poor-performance measurements, which pos... | visual navigation using edge curve matching for pinpoint planetary landing |
the akari irc all-sky survey provided more than twenty thousand thermal infrared observations of over five thousand asteroids. diameters and albedos were obtained by fitting an empirically calibrated version of the standard thermal model to these data. after the publication of the flux catalogue in october 2016, our ai... | the akari irc asteroid flux catalogue: updated diameters and albedos |
a high-fidelity approach for simulating the aerothermodynamic environments of meteor entries was developed, which allows the commonly assumed heat transfer coefficient of 0.1 to be assessed. this model uses chemically reacting computational fluid dynamics (cfd), coupled with radiation transport and surface ablation. co... | radiative heating of large meteoroids during atmospheric entry |
cm/ci meteorites range in degree of aqueous alteration suggesting differences in initially accreted materials including water ice and possible spatial heterogeneities within their parent bodies. as alteration progresses, the total abundance and magnesium content of phyllosilicates increases. in this paper we present th... | aqueous alteration on asteroids: linking the mineralogy and spectroscopy of cm and ci chondrites |
asteroid (514107) 2015 bz509 was discovered recently in jupiter's co-orbital region with a retrograde motion around the sun. the known chaotic dynamics of the outer solar system have so far precluded the identification of its origin. here, we perform a high-resolution statistical search for stable orbits and show that ... | an interstellar origin for jupiter's retrograde co-orbital asteroid |
the asteroid belt was dynamically shaped during and after planet formation. despite representing a broad ring of stable orbits, the belt contains less than one one-thousandth of an earth mass. the asteroid orbits are dynamically excited with a wide range in eccentricity and inclination and their compositions are divers... | origin and dynamical evolution of the asteroid belt |
recently, a nitrogen iceberg was proposed as a possible origin for the first interstellar object, 1i/2017 u1, also known as 'oumuamua. here, we show that the mass budget in exo-pluto planets necessary to explain the detection of 'oumuamua as a nitrogen iceberg chipped off from a planetary surface requires a mass of hea... | the mass budget necessary to explain 'oumuamua as a nitrogen iceberg |
mars express, the first european interplanetary mission, carries the mars advanced radar for subsurface and ionosphere sounding (marsis) to search for ice and water in the martian subsurface. developed by an italian-us team, marsis transmits low-frequency, wide-band radio pulses penetrating below the surface and reflec... | mars advanced radar for subsurface and ionospheric sounding (marsis) after nine years of operation: a summary |
in this paper, we present masses of 103 asteroids deduced from their perturbations on the orbits of the inner planets, in particular mars and the earth. these determinations and the inpop19a planetary ephemerides are improved by the recent mars orbiter navigation data and the updated orbit of jupiter based on the juno ... | asteroid masses obtained with inpop planetary ephemerides |
cloud initialization is a challenge in numerical weather prediction. probably the most relevant observations for this task come from geostationary satellites. these satellites provide the cloud mask with high spatio-temporal resolution and low latencies. the low latency is an attractive option for nowcasting systems su... | assessment of the goes-16 clear sky mask product over the contiguous usa using calipso retrievals |
a novel amplitude control method (acm) is proposed to construct multiple self-excited or hidden attractors by scaling partial or total variables without changing their dynamic and topological properties. various attractors including nested attractor, axisymmetric attractor, and centrosymmetric attractor can be obtained... | a novel amplitude control method for constructing nested hidden multi-butterfly and multiscroll chaotic attractors |
delivery of water and organics by asteroid and comet impacts may have influenced prebiotic chemistry on the early earth. some recent prebiotic chemistry experiments emphasize hydrogen cyanide (hcn) as a feedstock molecule for the formation of sugars, ribonucleotides, amino acids, and lipid precursors. here, we assess h... | cometary delivery of hydrogen cyanide to the early earth |
the asteroid (16) psyche may be the metal-rich remnant of a differentiated planetesimal, or it may be a highly reduced, metal-rich asteroidal material that never differentiated. the nasa psyche mission aims to determine psyche's provenance. here we describe the possible solar system regions of origin for psyche, prior ... | distinguishing the origin of asteroid (16) psyche |
context. the jaxa hayabusa2 mission will perform the first ever sample return from a primitive asteroid. the target near-earth asteroid (162173) ryugu will be reached in mid-2018 and its samples will be returned to the earth by the end of 2020.aims: we want to improve the current knowledge of the compositional and rota... | spectral and rotational properties of near-earth asteroid (162173) ryugu, target of the hayabusa2 sample return mission |
the annual flux of extraterrestrial material on earth is largely dominated by sub-millimetre particles. the mass distribution and absolute value of this cosmic dust flux at the earth's surface is however still uncertain due to the difficulty in monitoring both the collection efficiency and the exposure parameter (i.e. ... | the micrometeorite flux at dome c (antarctica), monitoring the accretion of extraterrestrial dust on earth |
optical observations of faint meteors (10-7 < mass < 10-4 kg) were collected by the canadian automated meteor observatory between 2010 april and 2014 may. these high-resolution (metre scale) observations were combined with two-station light-curve observations and the meteoroid orbit to classify meteors and attemp... | physical characteristics of faint meteors by light curve and high-resolution observations, and the implications for parent bodies |
detailed observations of the solar system planets reveal a wide variety of local atmospheric conditions. astronomical observations have revealed a variety of extrasolar planets none of which resembles any of the solar system planets in full. instead, the most massive amongst the extrasolar planets, the gas giants, appe... | atmospheric electrification in dusty, reactive gases in the solar system and beyond |
thermal inertia is a useful property to characterize a planetary surface, since it can be used as a qualitative measure of the regolith grain size. it is expected to vary with heliocentric distance because of its dependence on temperature. however, no previous investigation has conclusively observed a change in thermal... | observing the variation of asteroid thermal inertia with heliocentric distance |
much attention has been given in the literature to the effects of astrophysical events on human and land-based life. however, little has been discussed on the resilience of life itself. here we instead explore the statistics of events that completely sterilise an earth-like planet with planet radii in the range 0.5-1.5... | the resilience of life to astrophysical events |
micromega is a near-ir hyperspectral microscope designed to characterize in situ the texture and composition of the surface materials of the hayabusa2 target asteroid. micromega is implemented within the mascot lander (ho et al. in space sci. rev., 2016, this issue, doi:10.1007/s11214-016-0251-6). the spectral range (0... | the micromega investigation onboard hayabusa2 |
in fluid dynamics, an important problem is linked to the knowledge of the fluid pressure. recently, another approach to study incompressible fluid flow was suggested. it consists in using a general pressure equation (gpe) derived from compressible navier-stokes equation. in this paper, gpe is considered and compared wi... | numerical simulations of unsteady viscous incompressible flows using general pressure equation |
the timing and extent to which the initial interstellar material was thermally processed provide fundamental constraints for models of the formation and early evolution of the solar protoplanetary disk. we argue that the nonsolar (solar δ17o ≈ -29‰) and near-terrestrial (δ17o ≈ 0‰) o-isotopic compositions of the earth ... | measuring the level of interstellar inheritance in the solar protoplanetary disk |
bright materials have been reported in association with impact craters on ceres. the abundant na2co3 and some ammonium salts, nh4hco3 and/or nh4cl, were detected in bright deposits within occator crater with dawn near infrared spectroscopy. the composition and appearance of the salts suggest their aqueous mobilization ... | aqueous origins of bright salt deposits on ceres |
among solar system materials there are variable degrees of depletion in moderately volatile elements (mves, such as na, k, rb, cu, and zn) relative to the proto-solar composition. whether these depletions are due to nebular and/or parent-body (asteroidal or planetary) processes is still under debate. in order to help d... | potassium isotope compositions of carbonaceous and ordinary chondrites: implications on the origin of volatile depletion in the early solar system |
we review the construction of almost contact metric (three-) structures, abbreviated acm(3)s, on manifolds with a $g_2$ structure. these are of interest for certain supersymmetric configurations in string and m-theory. we compute the torsion of the $su(3)$ structure associated to an acms and apply these computations to... | almost contact structures on manifolds with a $g_2$ structure |
we present time-resolved visible spectrophotometry of 2020 cd3, the second known minimoon. the spectrophotometry was taken with the keck i/low resolution imaging spectrometer between wavelengths 434 and 912 nm in the b, g, v, r, i, and rg850 filters as it was leaving the earth-moon system on 2020 march 23 utc. the spec... | characterization of temporarily captured minimoon 2020 cd3 by keck time-resolved spectrophotometry |
the discovery of the intact minor planet embedded in the debris disc orbiting sdss j1228+1040 raises questions about the dynamical history of the system. further, the recent passage of the potentially interstellar object 1i/'oumuamua within the solar system has re-ignited interest in minor body flux through exoplanetar... | embedding planetesimals into white dwarf discs from large distances |
aims: the near-earth asteroid population suggests the existence of an inner main belt source of asteroids that belongs to the spectroscopic x complex and has moderate albedos. the identification of such a source has been lacking so far. we argue that the most probable source is one or more collisional asteroid families... | ancient and primordial collisional families as the main sources of x-type asteroids of the inner main belt |
context. the asteroid terrestrial-impact last alert system (atlas) is an all-sky survey primarily aimed at detecting potentially hazardous near-earth asteroids. apart from the astrometry of asteroids, it also produces their photometric measurements that contain information about asteroid rotation and their shape.aims: ... | asteroid models reconstructed from atlas photometry |
asteroid mining has been proposed as an approach to complement earth-based supplies of rare earth metals and to supply resources in space, such as water. however, existing studies on the economic viability of asteroid mining do not provide much guidance on which technological improvements would be needed for increasing... | a techno-economic analysis of asteroid mining |
subsequent to the moon's formation, late accretion to the terrestrial planets strongly modified the physical and chemical nature of their silicate crusts and mantles. here, we combine dynamical n-body and monte carlo simulations to determine impact probabilities, impact velocities, and expected mass augmentation onto t... | impact bombardment chronology of the terrestrial planets from 4.5 ga to 3.5 ga |
we report the mineralogy, petrography, and in situ measured 26al-26mg systematics in chondrules from the least metamorphosed cv3 (vigarano-type) chondrites, kaba and yamato (y) 980145. two y 980145 chondrules measured show no resolvable excesses in 26mg (26mg∗), a decay product of a short-lived (t1/2 ∼0.7 ma) radionucl... | 26al-26mg systematics in chondrules from kaba and yamato 980145 cv3 carbonaceous chondrites |
aims: we explore the performance of neural networks in automatically classifying asteroids into their taxonomic spectral classes. we particularly focus on what the methodology could offer the esa gaia mission.methods: we constructed an asteroid dataset that can be limited to simulating gaia samples. the samples were fe... | asteroid spectral taxonomy using neural networks |
we introduce adam, the all-data asteroid modelling algorithm. adam is simple and universal since it handles all disk-resolved data types (adaptive optics or other images, interferometry, and range-doppler radar data) in a uniform manner via the 2d fourier transform, enabling fast convergence in model optimization. the ... | adam: a general method for using various data types in asteroid reconstruction |
we performed pulsed laser irradiation to simulate the progressive space weathering of three individual chips of the cm2 murchison meteorite. after irradiation, we performed two-step laser desorption mass spectrometry to analyze alterations in the concentration, distribution, and functional group chemistry of organics i... | the effect of progressive space weathering on the organic and inorganic components of a carbonaceous chondrite |
determining compositional trends among individual minerals is key to understanding the thermodynamic conditions under which they formed and altered, and is also essential to maximizing the scientific value of small extraterrestrial samples, including returned samples and meteorites. here we report the chemical composit... | the fe/s ratio of pyrrhotite group sulfides in chondrites: an indicator of oxidation and implications for return samples from asteroids ryugu and bennu |
antarctic carbonaceous chondrite (cc) meteorite chip samples in the japanese and us collections have been studied by an ultraviolet (uv), visible (vis), and near-infrared (nir) (uvvnir) spectrometer and a fourier-transform infrared (ftir) spectrometer, targeting small areas of about 2-6 mm in diameter. uvvnir and ftir ... | uv-visible-infrared spectral survey of antarctic carbonaceous chondrite chips |
the arrival of the robustly hyperbolic asteroid a/2017 u1 has potentially interesting ramifications for the planet-formation process. although extrapolations from a sample size of one are necessarily uncertain, order-of-magnitude estimates suggest that the galaxy contains a substantial mass in similar bodies. we argue ... | on the consequences of the detection of an interstellar asteroid |
we report on the results of a systematic search for associated asteroid families for all active asteroids known to date. we find that 10 out of 12 main-belt comets (mbcs) and five out of seven disrupted asteroids are linked with known or candidate families, rates that have ∼0.1% and ∼6% probabilities, respectively, of ... | asteroid family associations of active asteroids |
the acapulcoites and lodranites are rare groups of primitive achondrites that originate from a common parent body and are of particular interest since they experienced only partial melting. we calculated thermal evolution and differentiation models of the parent body of the acapulco-lodran meteorite clan. the models we... | modeling the evolution of the parent body of acapulcoites and lodranites: a case study for partially differentiated asteroids |
a fast radio burst (frb) was recently detected to be associated with a hard x-ray burst from the galactic magnetar sgr 1935+2154. scenarios involving magnetars for frbs are hence highly favored. in this work, we suggest that the impact between an asteroid and a magnetar could explain such a detection. according to our ... | frb 200428: an impact between an asteroid and a magnetar |
this pds data set represents a compilation of published diameters, optical albedos, near-infrared albedos, and beaming parameters for minor planets detected by neowise during the fully cryogenic, 3-band cryo, post-cryo and neowise-reactivation years 1 through 3 operations. it contains data covering near-earth asteroids... | neowise diameters and albedos v2.0 |
photometry from the helios and stereo spacecraft revealed regions of enhanced sky surface-brightness suggesting a narrow circumsolar ring of dust associated with venus’s orbit. we model this phenomenon by integrating the orbits of 10,000,000+ dust particles subject to gravitational and non-gravitational forces, conside... | co-orbital asteroids as the source of venus's zodiacal dust ring |
our knowledge of white dwarf planetary systems predominately arises from the region within a few solar radii of the white dwarfs, where minor planets breakup, form rings and discs, and accrete on to the star. the entry location, angle, and speed into this roche sphere has rarely been explored but crucially determines t... | the entry geometry and velocity of planetary debris into the roche sphere of a white dwarf |
we describe the fall of annama meteorite occurred in the remote kola peninsula (russia) close to finnish border on 2014 april 19 (local time). the fireball was instrumentally observed by the finnish fireball network. from these observations the strewnfield was computed and two first meteorites were found only a few hun... | orbit and dynamic origin of the recently recovered annama's h5 chondrite |
the rubble pile spin barrier is an upper limit on the rotation rate of asteroids larger than ∼200-300 m. among thousands of asteroids with diameters larger than ∼300 m, only a handful of asteroids are known to rotate faster than 2.0 h, all are in the sub-km range (⩽0.6 km). here we present photometric measurements sugg... | a 2 km-size asteroid challenging the rubble-pile spin barrier - a case for cohesion |
discs of bodies orbiting a much more massive central object are extremely common in astrophysics. when the orbits comprising such discs are eccentric, we show they are susceptible to a new dynamical instability. gravitational forces between bodies in the disc drive exponential growth of their orbital inclinations and c... | a new inclination instability reshapes keplerian discs into cones: application to the outer solar system |
the most dramatic phases of terrestrial planet formation are thought to be oligarchic and chaotic growth, on timescales of up to 100-200 myr, when violent impacts occur between large planetesimals of sizes up to protoplanets. such events are marked by the production of large amounts of debris, as has been observed in s... | extreme debris disk variability: exploring the diverse outcomes of large asteroid impacts during the era of terrestrial planet formation |
the properties of the first-discovered interstellar object (iso), 1i/2017 ('oumuamua), differ from both solar system asteroids and comets, casting doubt on a protoplanetary disk origin. in this study, we investigate the possibility that it formed with a substantial h2 ice component in the starless core of a giant molec... | assessing the formation of solid hydrogen objects in starless molecular cloud cores |
the k2 mission of the kepler space telescope allowed the observations of light curves of small solar system bodies throughout the whole solar system. in this paper, we present the results of a collection of k2 trans-neptunian object observations between campaigns c03 (2014 november-2015 february) and c19 (2018 august-s... | light curves of trans-neptunian objects from the k2 mission of the kepler space telescope |
although solar system bodies exhibit large variations in their volatile element abundances, the mechanisms and conditions that lead to these variations remain ambiguous. the howardite-eucrite-diogenite (hed) meteorites that likely sample the asteroid 4 vesta, provide evidence for extensive volatile depletion on their p... | tracking the volatile and magmatic history of vesta from chromium stable isotope variations in eucrite and diogenite meteorites |
we present an analysis of new and published data on p/2013 r3, the first asteroid detected while disintegrating. thirteen discrete components are measured in the interval between ut 2013 october 01 and 2014 february 13. we determine a mean, pair-wise velocity dispersion among these components of δv = 0.33 ± 0.03 m s-1 ... | anatomy of an asteroid breakup: the case of p/2013 r3 |
this paper aims to propose a novel approach to classify acoustic emission (ae) signals deriving from corrosion experiments, even if embedded into a noisy environment. to validate this new methodology, synthetic data are first used throughout an in-depth analysis, comparing random forests (rf) to the k-nearest neighbor ... | classification of acoustic emission signals using wavelets and random forests : application to localized corrosion |
the propagation of hopping trajectories with uncertainties is investigated over the surface of small celestial bodies. an intuitive geometric description of the accessible area referred to as the potential hop reachable domain, is provided when considering the uncertainties of the hopping rover's state variables as wel... | potential hop reachable domain over surfaces of small bodies |
china will launch in the forthcoming years a sample return mission called zhenghe, to asteroid 469219 kamo`oalewa (provisional designation 2016ho3) and comet 133p/elst-pizarro. the mission will consist of an orbiter and a nano-lander. one of zhenghe's investigations is the radio science experiment, whose main objective... | a simulated global gm estimate of the asteroid 469219 kamo`oalewa for china's future asteroid mission |
contact. the nasa new frontiers asteroid sample return mission origins, spectral interpretation, resource identification, and security-regolith explorer (osiris-rex) has provided a large amount of data on the asteroid (101955) bennu, including high-quality spectra obtained by the osiris-rex visible and infrared spectro... | osiris-rex spectral analysis of (101955) bennu by multivariate statistics |
near-earth asteroids (neas) are organized into five main classes: amor, apollo, aten, atira and 'ayló'chaxnim. asteroids belonging to the 'ayló'chaxnim class are located entirely within the orbit of venus making them difficult to detect by ground-based observatories. the first-known asteroid of this class, (594913) 'ay... | preliminary estimates of the zwicky transient facility 'ayló'chaxnim asteroid population completeness |
in order to determine the controls on the reflectance spectra of hydrated carbonaceous chondrites, reflectance spectra were measured for a series of samples with well-determined mineralogy, water-content, and thermal history. this includes 5 cr chondrites, 11 cm chondrites, and 7 thermally metamorphosed cm chondrites. ... | what is controlling the reflectance spectra (0.35-150 μm) of hydrated (and dehydrated) carbonaceous chondrites? |
the thermophysical properties of small solar system bodies are essential to be determined, on which the thermal evolution of small bodies largely depends. the carbonaceous asteroid ryugu is one of the small undifferentiated bodies formed in the early solar system. hayabusa2 explored the asteroid ryugu and returned the ... | measurement of microscopic thermal diffusivity distribution for ryugu sample by infrared lock-in periodic heating method |
polluted white dwarfs (wds) offer a unique way to study the bulk compositions of exoplanetary material, but it is not always clear if this material originates from comets, asteroids, moons, or planets. we combine n-body simulations with an analytical model to assess the prevalence of extrasolar moons as wd polluters. u... | exomoons as sources of white dwarf pollution |
biological communities on the abyssal plain are largely dependent on detritus from the surface ocean as their main source of energy. seasonal fluctuations in the deposition of that detritus cause temporal variations in the quantity and quality of food available to these communities, altering their structure and the act... | response of deep-sea deposit-feeders to detrital inputs: a comparison of two abyssal time-series sites |
all asteroids are currently classified as either family, originating from the disruption of known bodies1, or non-family. an outstanding question is the origin of these non-family asteroids. were they formed individually, or as members of known families but with chaotically evolving orbits, or are they members of old g... | the common origin of family and non-family asteroids |
the microwave power absorption efficiency of the μ10 ecr ion thruster, utilized in the japanese asteroid explorers hayabusa and hayabusa2, is investigated in order to allow performance measurement and provide information for its improvement. a model detailing the local electron behavior in a real ecr plasma discharge, ... | microwave power absorption to high energy electrons in the ecr ion thruster |
context. information about the spin state of asteroids is important for our understanding of the dynamical processes affecting them. however, spin properties of asteroids are known for only a small fraction of the whole population.aims: to enlarge the sample of asteroids with a known rotation state and basic shape prop... | asteroid models reconstructed from the lowell photometric database and wise data |
in 2018, the mother spacecraft of the hayabusa2 mission will release the lander mascot above the surface of the asteroid (162173) ryugu. the lander will impact the regolith layer of the asteroid at low speed. while the descent trajectory of mascot is well determined before its release, its behavior once it touches the ... | numerical simulations of the contact between the lander mascot and a regolith-covered surface |
the orbital structure of the asteroid belt holds a record of the solar system’s dynamical history. the current belt only contains ∼10-3 earth masses yet the asteroids’ orbits are dynamically excited, with a large spread in eccentricity and inclination. in the context of models of terrestrial planet formation, the belt ... | the asteroid belt as a relic from a chaotic early solar system |
with approximately one ninth of earth's mass, mars is widely considered to be a stranded planetary embryo that never became a fully-grown planet. a currently popular planet formation theory predicts that mars formed near earth and venus and was subsequently scattered outwards to its present location. in such a scenario... | the cool and distant formation of mars |
context. in the core accretion scenario of planet formation, rocky cores grow by first accreting solids until they are massive enough to accrete gas. for giant planet formation, this means that a massive core must form within the lifetime of the gas disk. inspired by observations of solar system features such as the as... | the interplay between pebble and planetesimal accretion in population synthesis models and its role in giant planet formation |
context. asteroids orbiting into the highly magnetized and highly relativistic wind of a pulsar offer a favorable configuration for repeating fast radio bursts (frb). the body in direct contact with the wind develops a trail formed of a stationary alfvén wave, called an alfvén wing. when an element of wind crosses the ... | repeating fast radio bursts caused by small bodies orbiting a pulsar or a magnetar |
context. dynamical models of solar system evolution have suggested that the so-called p- and d-type volatile-rich asteroids formed in the outer solar system beyond neptune's orbit and may be genetically related to the jupiter trojans, comets, and small kuiper belt objects (kbos). indeed, the spectral properties of p- a... | evidence for differentiation of the most primitive small bodies |
in this work we present the design of the atlas unit (asteroid terrestrial-impact last alert system) that will be installed at teide observatory in tenerife island (spain). atlas-teide will be built by the instituto de astrofisica de canarias (iac) and will be operated as part of the atlas network in the framework of a... | atlas-teide: the next generations of atlas units for the teide observatory |
we report the methods of and initial scientific inferences from the extraction of precision photometric information for the >800 trans-neptunian objects (tnos) discovered in the images of the dark energy survey (des). scene-modeling photometry is used to obtain shot-noise-limited flux measures for each exposure of e... | photometry of outer solar system objects from the dark energy survey. i. photometric methods, light-curve distributions, and trans-neptunian binaries |
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