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the distribution of the short-lived radionuclide 26al in the early solar system remains a major topic of investigation in planetary science. thousands of analyses are now available but grossite-bearing ca-, al-rich inclusions (cais) are underrepresented in the database. recently found grossite-bearing inclusions in co3... | oxygen and al-mg isotopic compositions of grossite-bearing refractory inclusions from co3 chondrites |
the almahata sitta strewn field is dominated by ureilites, but contains a large fraction of chondritic fragments of various types. we analyzed stable isotopes of he, ne, ar, kr, and xe, and the cosmogenic radionuclides 10be, 26al, and 36cl in six chondritic almahata sitta fragments (el6 breccia, el6, el3-5, cb, ll4/5, ... | cosmic-ray exposure ages of six chondritic almahata sitta fragments |
the asteroid impact & deflection assessment (aida) mission is planning to visit the didymos binary system in 2022 in order to perform the first demonstration ever of the kinetic impact technique. binary asteroids are an ideal target for this since the deflection of the secondary body can be accurately measured by a... | numerical investigation of the dynamical environment of 65803 didymos |
granvik et al. reported an absence of asteroids on orbits with perihelia near the sun that they attribute to the "supercatastrophic disruption" of these bodies. here we investigate whether there is evidence for this process among other bodies with similarly low perihelia: near-earth asteroids, solar and heliospheric ob... | supercatastrophic disruption of asteroids in the context of soho comet, fireball, and meteor observations |
the strategy of detecting physiological signals and body movements using fabric-based pressure sensors offers the opportunity to unobtrusively collect multimodal health metrics using loose-fitting, familiar garments in natural environments. (a. kiaghadi, s. z. homayounfar, j. gummeson, t. andrew, and d. ganesan, proc. ... | pression: an all-fabric piezoionic pressure sensor for extracting physiological metrics in both static and dynamic contexts |
impact-induced seismic waves are supposed to cause movements of regolith particles, resulting in modifications of asteroidal surfaces. the imparted seismic energy is thus a key parameter to determining the scale and magnitude of this seismic shaking process. it is important to study the propagation velocity, attenuatio... | experimental study on impact-induced seismic wave propagation through granular materials |
laboratory impact experiments have found that impact fragments tend to be elongated. their shapes, as defined by axes a, b and c, these being the maximum dimensions of the fragment in three mutually orthogonal planes (a ⩾ b ⩾ c), are distributed around mean values of the axial ratios b/a ∼ 0.7 and c/a ∼ 0.5. this corre... | fragment shapes in impact experiments ranging from cratering to catastrophic disruption |
the recently discovered first interstellar object 1i/2017 u1 (`oumuamua) has brightness that varies by a factor of 10, a range greater than that of any solar system asteroid, a spectrum characteristic of type d asteroids, and no evidence of evaporating volatiles, contrary to expectation for exo-oort clouds. `oumuamua i... | why is interstellar object 1i/2017 u1 (`oumuamua) rocky, tumbling and possibly very prolate? |
escalating observations of exo-minor planets and their destroyed remnants both passing through the solar system and within white dwarf planetary systems motivate an understanding of the orbital history and fate of exo-kuiper belts and planetesimal discs. here, we explore how the structure of a 40-1000 au annulus of pla... | linking the formation and fate of exo-kuiper belts within solar system analogues |
recent advances in cubesats technology are leading the transition from purely education tools to actual scientific missions. the small volumes and masses, the versatile purpose, as well as the fast development time associated with a potential high return-to-cost ratio are at the origin of the increasing number of new m... | interplanetary cubesats for asteroid exploration: mission analysis and design |
we present evidence, via a large survey of 191 new spectra along with previously published spectra, of a divide in the 3 μm spectral properties of the low-albedo asteroid population. one group ("sharp types," or sts, with band centers <3 μm) has a spectral shape consistent with carbonaceous chondrite meteorites, whi... | the nature of low-albedo small bodies from 3 μm spectroscopy: one group that formed within the ammonia snow line and one that formed beyond it |
in recent years, several small basaltic v-type asteroids have been identified all around the main belt. most of them are members of the vesta dynamical family, but an increasingly large number appear to have no link with it. the question that arises is whether all these basaltic objects do indeed come from vesta. to fi... | spectral characterization of v-type asteroids - ii. a statistical analysis |
comet p/2019 ld2 has orbital elements currently resembling those of a jupiter trojan, and therefore superficially appears to represent a unique opportunity to study the volatile content and active behavior of a member of this population for the first time. however, numerical integrations show that it was previously a c... | the transient jupiter trojan-like orbit of p/2019 ld2 (atlas) |
returning humans to the moon presents an unprecedented opportunity to determine the origin of volatiles stored in the permanently shaded regions (psrs), which trace the history of lunar volcanic activity, solar wind surface chemistry, and volatile delivery to the earth and moon through impacts of comets, asteroids, and... | exogenic origin for the volatiles sampled by the lunar crater observation and sensing satellite impact |
the deflection of potentially dangerous asteroids has been treated with great intensity and has gained more and more attention in scientific research. different techniques are developed over the years. among these techniques, we found the kinetic impact deflection technique to be the most viable at the moment. in this ... | deflecting an asteroid on a collision course with earth using a powered swing-by maneuver |
this study explores the possibility of improving the impact of the advanced himawari imager (ahi) clear-sky radiance data assimilation (da), focusing on cloud detection. first, the performance of the "clear-channel" detection scheme of the minimum residual (mr) method embedded in the gridpoint statistical interpolation... | improved himawari-8/ahi radiance data assimilation with a double cloud detection scheme |
an electric solar wind sail uses the natural solar wind stream to produce low but continuous thrust by interacting with a number of long thin charged tethers. it allows a spacecraft to generate a thrust without consuming any reaction mass. the aim of this paper is to investigate the use of a spacecraft with such a prop... | electric solar wind sail kinetic energy impactor for asteroid deflection missions |
space weathering is one of the most common surface process occurring on atmosphere-free bodies such as asteroids and the moon. it is caused mainly by solar wind irradiation and the impact of micrometeoroids. in order to simulate space weathering effects, in particular those produced by hypervelocity impacts, we produce... | femtosecond laser irradiation of olivine single crystals: experimental simulation of space weathering |
the discovery of olivine on vesta's surface by the vir imaging spectrometer onboard the dawn space mission has forced us to reconsider our views of vestan petrogenetic models. olivines were expected to be present in the interior of vesta: in the mantle of a vertically layered body as invoked by the magma ocean models, ... | detection of new olivine-rich locations on vesta |
evidence of marine target impacts, binary impact craters, or impact clusters are rare on earth. seismic reflection data from the guinea plateau, west africa, reveal a ≥8.5-km-wide structure buried below ~300 to 400 m of paleogene sediment with characteristics consistent with a complex impact crater. these include an el... | the nadir crater offshore west africa: a candidate cretaceous-paleogene impact structure |
the conventional least-squares asteroid mass determination algorithm allows us to solve for the mass of a large subject asteroid that is perturbing the trajectory of a smaller test asteroid. however, this algorithm is necessarily a first approximation, ignoring the possibility that the subject asteroid may itself be pe... | simultaneous mass determination for gravitationally coupled asteroids |
a consequence of the assumptions of the infinitesimal model, one of the most important theoretical foundations of quantitative genetics, is that phenotypic traits are predicted to be most often normally distributed (so‑called gaussian traits). but phenotypic traits, especially those interesting for evolutionary biology... | quantitative genetic methods depending on the nature of the phenotypic trait |
space weathering effects on the rocky s-class asteroids are well understood. however, on the low-albedo c-complex asteroids, such as spacecraft targets bennu and ryugu, the situation is more complicated, especially due to a lack of spectral features throughout the visible-near infrared spectral region. here we show, th... | c-complex asteroids: uv-visible spectral characteristics and implications for space weathering effects |
the phase function of the dust coma of comet 67p has been determined from rosetta/osiris images. this function shows a deep minimum at phase angles near 100°, and a strong backscattering enhancement. these two properties cannot be reproduced by regular models of cometary dust, most of them based on wavelength-sized and... | models of rosetta/osiris 67p dust coma phase function |
the dusty regolith covering the surfaces of asteroids and planetary satellites differs in size, shape, and composition from terrestrial soil particles and is subject to environmental conditions very different from those found on earth. this regolith evolves in a low ambient pressure and low-gravity environment. its res... | regolith behavior under asteroid-level gravity conditions: low-velocity impact experiments |
we report on a kepler spacecraft survey during the k2 mission to characterize the rotational properties of 56 trojan asteroids in the l4 cloud. more than one rotational period was observed for 51 of these targets, allowing for well constrained lightcurve rotation periods and amplitudes, five of which are found to be in... | trojan asteroids in the kepler campaign 6 field |
we propose a lsst solar system near-sun survey, to be implemented during twilight hours, that extends the seasonal reach of lsst to its maximum as fresh sky is uncovered at about 50 square degrees per night (1500 sq. deg. per lunation) in the morning eastern sky, and surveyable sky is lost at the same rate to the weste... | a near-sun solar system twilight survey with lsst |
this study focuses on the secular dynamics of orbital motion around asteroids with joint effects of c20 term and solar radiation pressure (srp). with their combined influences, two specific orbits are firstly studied, namely the solar terminator orbit (sto) and the heliotropic orbit. then, the global orbital motion oth... | secular dynamics around small bodies with solar radiation pressure |
extrasolar debris disks are the dust disks found around nearby main sequence stars arising from the breakup of asteroids and comets orbiting the stars. far-ir surveys (e.g., with herschel) showed that ∼20% of stars host detectable dust levels. while dust temperatures suggest a location at 10s of au comparable with our ... | extrasolar kuiper belts |
debris discs around main-sequence stars are belts of planetesimals - asteroids and comets - formed in the protoplanetary discs around young stars. planetesimals comprise both the building blocks of planets around young stars and the source of dusty debris around older stars. imaging observations of dust continuum emiss... | a search for trends in spatially resolved debris discs at far-infrared wavelengths |
we have developed a method for simulating the mesoscale compaction of early solar system solids in low-velocity impact events using the isale shock physics code. chondrules are represented by non-porous disks, placed within a porous matrix. by simulating impacts into bimodal mixtures over a wide range of parameter spac... | mesoscale modeling of impact compaction of primitive solar system solids |
minor bodies trapped in 1:1 co-orbital resonances with a host planet could be relevant to explain the origin of captured satellites. among the giant planets, uranus has one of the smallest known populations of co-orbitals, three objects, and all of them are short-lived. asteroid 2015 db216 has an orbital period that ma... | asteroid 2015 db216: a recurring co-orbital companion to uranus |
deriving thermophysical properties such as thermal inertia from thermal infrared observations provides useful insights into the structure of the surface material on planetary bodies. the estimation of these properties is usually done by fitting temperature variations calculated by thermophysical models to infrared obse... | thermophysical modelling and parameter estimation of small solar system bodies via data assimilation |
context. with an estimated diameter in the 320-350 km range, (704) interamnia is the fifth largest main belt asteroid and one of the few bodies that fills the gap in size between the four largest bodies with d > 400 km (ceres, vesta, pallas and hygiea) and the numerous smaller bodies with diameter ≤200 km. however, ... | (704) interamnia: a transitional object between a dwarf planet and a typical irregular-shaped minor body |
we introduce a new computational technique for searching for faint moving sources in astronomical images. starting from a maximum-likelihood estimate for the probability of the detection of a source within a series of images, we develop a massively parallel algorithm for searching through candidate asteroid trajectorie... | fast algorithms for slow moving asteroids: constraints on the distribution of kuiper belt objects |
a set of 50,000 artificial earth impacting asteroids was used to obtain, for the first time, information about the dominance of individual impact effects such as wind blast, overpressure shock, thermal radiation, cratering, seismic shaking, ejecta deposition, and tsunami for the loss of human life during an impact even... | asteroid impact effects and their immediate hazards for human populations |
we present shape models and volume estimates of twenty asteroids based on relative photometry and adaptive optics images. we discuss error estimation and the effects of myopic deconvolution on shape solutions. for further analysis of the information capacities of data sources, we also present and discuss ambiguity and ... | adaptive optics and lightcurve data of asteroids: twenty shape models and information content analysis |
fireball networks establish the trajectories of meteoritic material passing through earth's atmosphere, from which they can derive pre-entry orbits. triangulated atmospheric trajectory data require different orbit determination methods to those applied to observational data beyond the earth's sphere of influence, such ... | comparing analytical and numerical approaches to meteoroid orbit determination using hayabusa telemetry |
we report a comprehensive analysis of the global spectrophotometric properties of ceres using the images collected by the dawn framing camera through seven color filters from april to june 2015 during the rc3 (rotational characterization 3) and survey mission phases. we derived the hapke model parameters for all color ... | spectrophotometric modeling and mapping of ceres |
context. hot exozodiacal dust has been shown to be present in the innermost regions of an increasing number of main sequence stars over the past 15 yr. however, the origin of hot exozodiacal dust and its connection with outer dust reservoirs remains unclear.aims: we aim to explore the possible connection between hot ex... | a near-infrared interferometric survey of debris-disk stars. vii. the hot-to-warm dust connection |
volatile-rich asteroids are crucial to understanding the transport of water and organics to the terrestrial planet forming region in the early solar system. observations of two such asteroids by hayabusa2 and origins, spectral interpretation, resource identification, security, regolith explorer (osiris-rex) suggest a r... | a spectral investigation of aqueously and thermally altered cm, cm-an, and cy chondrites under simulated asteroid conditions for comparison with osiris-rex and hayabusa2 observations |
we estimate the total population of near-earth objects (neos) in the solar system using an extensive, "solar-system-to-pixels" fake-asteroid simulation to debias detections of real neos by the atlas survey. down to absolute magnitudes h = 25 and 27.6 (diameters of ∼34 and 10 m, respectively, for 15% albedo), we find to... | neo population, velocity bias, and impact risk from an atlas analysis |
we report on the characterization of the dust activity and dynamical evolution of two faint active asteroids, p/2019 a4, and p/2021 a5, observed with the 10.4 m gtc using both imaging and spectroscopy. asteroid p/2019 a4 activity is found to be linked to an impulsive event occurring some ±10 d around perihelion, probab... | dust environment of active asteroids p/2019 a4 (panstarrs) and p/2021 a5 (panstarrs) |
primordial black holes (pbhs) in the mass range $\sim 10^{17}- 10^{22}$g are currently unconstrained, and can constitute the full dark matter (dm) density of the universe. motivated by this, in the current work, we aim to relate the existence of pbhs in the said mass range to the production of observable gravitational ... | gravitation wave signal from asteroid mass primordial black hole dark matter |
recent estimates of the characteristics of planet nine have suggested that it could be closer than originally assumed. such a planet nine would also be brighter than originally assumed, suggesting the possibility that it has already been observed in wide-field moderate-depth surveys. we search for planet nine in the zw... | a search for planet nine using the zwicky transient facility public archive |
there are currently over 20,000 known near-earth asteroids (neas) and more are being discovered on a daily basis. near earth asteroids are the small bodies whose orbits bring them to within 1.3 au of the sun, which makes each one a useful opportunity for science and commercial missions. here we design and generate a tr... | target evaluation for near earth asteroid long-term mining missions |
ultraviolet and optical spectra of the hydrogen-dominated atmosphere white dwarf star g238-44 obtained with fuse, keck/hires, hst/cos, and hst/stis reveal 10 elements heavier than helium: c, n, o, mg, al, si, p, s, ca, and fe. g238-44 is only the third white dwarf with nitrogen detected in its atmosphere from polluting... | unusual abundances from planetary system material polluting the white dwarf g238-44 |
on june 19, 2020 at 20:05:07 utc, a fireball lasting 5.5 s was observed above western australia by three desert fireball network observatories. the meteoroid entered the atmosphere with a speed of 14.00±0.17 km s-1 and followed a 58° slope trajectory from a height of 75 km down to 18.6 km. despite the poor angle of tri... | trajectory, recovery, and orbital history of the madura cave meteorite |
we propose to design and build an algorithm that will use a convolutional neural network (cnn) and observations from the unistellar network to reliably detect asteroid occultations. the unistellar network is made of more than 10,000 digital telescopes owned by citizen scientists, and is regularly used to record asteroi... | odnet: a convolutional neural network for asteroid occultation detection |
codification of free-text clinical narratives have long been recognised to be beneficial for secondary uses such as funding, insurance claim processing and research. the current scenario of assigning codes is a manual process which is very expensive, time-consuming and error prone. in recent years, many researchers hav... | a systematic literature review of automated icd coding and classification systems using discharge summaries |
aims: from light curve and radar data we know the spin axis of only 43 near-earth asteroids. in this paper we attempt to constrain the spin axis obliquity distribution of near-earth asteroids by leveraging the yarkovsky effect and its dependence on an asteroid's obliquity.methods: by modeling the physical parameters dr... | constraints on the near-earth asteroid obliquity distribution from the yarkovsky effect |
we specify the range to which perturbations penetrate a planetesimal system. such perturbations can originate from massive planets or from encounters with other stars. the latter can have an origin in the star cluster in which the planetary system was born, or from random encounters once the planetary system has escape... | the fragility of planetary systems |
in recent years, a paradigm shift has occurred in exoplanet science, wherein low-mass stars are increasingly viewed as a foundational pillar of the search for potentially habitable worlds in the solar neighborhood. however, the formation processes of this rapidly accumulating sample of planet systems are still poorly u... | habitable planet formation around low-mass stars: rapid accretion, rapid debris removal, and the essential contribution of external giants |
we have conducted high-pressure, high-temperature isotope exchange experiments between molten silicate and molten fe-si-c-alloys to constrain the effect of si on equilibrium fe isotope fractionation during planetary core formation. the values of δ57femetal-silicate at 1850 °c and 1 gpa determined by high-resolution mc-... | the effect of core composition on iron isotope fractionation between planetary cores and mantles |
enstatite chondrites are a small clan of meteorites, only ~ 1% out of all meteorite collection. however, they are the most reduced meteorites and have almost identical isotopic compositions to those of the earth, suggestive of significant contributions to the latter and other terrestrial planets. enstatite chondrites c... | enstatite chondrites: condensation and metamorphism under extremely reducing conditions and contributions to the earth |
in 2006, vega was discovered to display excess near-infrared (nir) emission. surveys now detect this phenomenon for one fifth of main-sequence stars, across various spectral types and ages. the excesses are interpreted as populations of small, hot dust grains very close to their stars, which must originate from comets ... | gas trapping of hot dust around main-sequence stars |
operation of a small cubesat in the deep-space microgravity environment brings additional challenging factors including the increased radiation environment, the significant contribution of non-gravitational forces to the satellite orbit, or the limited communication opportunities. these factors need to be taken into ac... | feasibility of asteroid exploration using cubesats-aspect case study |
the dwarf planet ceres shows spatially well-defined regions, which exhibit a negative (blue) spectral slope between 0.5 and 2.5 µm. comparisons with planetary bodies known to exhibit a blue slope and spectral properties of materials identified on ceres's surface based on infrared wavelength signatures indicate that the... | an investigation of the bluish material on ceres |
chondritic meteorites have been traditionally thought to be samples of undifferentiated bodies that never experienced large-scale melting. this view has been challenged by the existence of post-accretional, unidirectional natural remanent magnetization (nrm) in cv carbonaceous chondrites. the relatively young inferred ... | were chondrites magnetized by the early solar wind? |
we report radar observations (2380-mhz, 13-cm) by the arecibo observatory and optical light curves observed from eight different observatories and collected at the ondřejov observatory of the triple near-earth asteroid system (153591) 2001 sn263. the radar observations were obtained over the course of ten nights spanni... | physical modeling of triple near-earth asteroid (153591) 2001 sn263 from radar and optical light curve observations |
we developed universal sample holders [the kochi grid, kochi clamp, and okazaki cell) and a transfer vessel (facility-to-facility transfer container (fftc)] to analyze sensitive and fragile samples, such as extremely small extraterrestrial materials. the holders and container prevent degradation, contamination due to t... | the universal sample holders of microanalytical instruments of fib, tem, nanosims, and stxm-nexafs for the coordinated analysis of extraterrestrial materials |
as evidenced by the chelyabinsk and tunguska airburst events in russia, decameter-scale near-earth objects (neos) can pose a hazard to human life and infrastructure from the energy they deposit in the atmosphere as they break up. to understand the potential damage these small neos can cause on earth's surface, it is im... | uncertainty quantification in continuous fragmentation airburst models |
in the pandemic time, the monitoring of the progression of some diseases is affected and rehabilitation is more complicated. remote monitoring may help solve this problem using mobile devices that embed low-cost sensors, which can help measure different physical parameters. many tests can be applied remotely, one of wh... | development technologies for the monitoring of six-minute walk test: a systematic review |
comet nuclei and d-type asteroids have several similarities at optical and near-ir wavelengths, including near-featureless red reflectance spectra, and low albedos. mineral identifications based on these characteristics are fraught with degeneracies, although some general trends can be identified. in contrast, spectral... | mid-infrared spectra of comet nuclei |
ordinary chondrites (ocs) are variably thermally metamorphosed meteorites thought to originate from at least three different parent bodies (h, l, and ll) in the main belt of asteroids. the thermal evolutions of oc parent bodies are frequently explained by the onion shell model; however, a competing hypothesis is the fr... | evidence for early fragmentation-reassembly of ordinary chondrite (h, l, and ll) parent bodies from ree-in-two-pyroxene thermometry |
we conducted a petrologic study of apatite within eight unbrecciated, non-cumulate eucrites and two monomict, non-cumulate eucrites. these data were combined with previously published data to quantify the abundances of f, cl, and h2o in the bulk silicate portion of asteroid 4 vesta (bsv). using a combination of apatite... | the abundances of f, cl, and h2o in eucrites: implications for the origin of volatile depletion in the asteroid 4 vesta |
a photometric survey of near-earth asteroids (neas) was conducted from 2012 through 2014 at lulin observatory, taiwan. the measurements of the color indices, b-v, v-r, and v-i allow the classification of 92 neas into seven taxonomic types. of these samples, 39 of them are new classifications. the fractional abundances ... | photometric survey and taxonomic identifications of 92 near-earth asteroids |
a number of different classifications have been proposed for the cr chondrites; this study aims at reconciling these different schemes. mineralogy-based classification has proved particularly challenging for weakly to moderately altered crs because incipient mineral replacement and elemental mobilization arising from a... | why is it so difficult to classify renazzo-type (cr) carbonaceous chondrites? - implications from tem observations of matrices for the sequences of aqueous alteration |
the first confirmed interstellar interloper in our solar system, 1i/`oumuamua, is likely to be a minor body ejected from another star, but its brief flyby and faintness made it difficult to study. two remarkable properties are its large (up to 2.5 mag) rotational variability and its motion relative to the sun before en... | what and whence 1i/`oumuamua: a contact binary from the debris of a young planetary system? |
for the first time, spectral signs of subtle coma activity were observed for four main-belt primitive asteroids (145) adeona, (704) interamnia, (779) nina, and (1474) beira around their perihelion distances in september 2012, which were interpreted as manifestations of the sublimation of h2o ice in/under the surface ma... | new candidates for active asteroids: main-belt (145) adeona, (704) interamnia, (779) nina, (1474) beira, and near-earth (162,173) ryugu |
the population of large 100+ km asteroids is thought to be primordial. as such, they are the most direct witnesses of the early history of our solar system available. those among them with satellites allow study of the mass, and hence density and internal structure. we study here the dynamical, physical, and spectral p... | physical, spectral, and dynamical properties of asteroid (107) camilla and its satellites |
castaway is a mission concept to explore our solar system's main asteroid belt. asteroids and comets provide a window into the formation and evolution of our solar system and the composition of these objects can be inferred from space-based remote sensing using spectroscopic techniques. variations in composition across... | castaway: an asteroid main belt tour and survey |
the airburst events at chelyabinsk and tunguska in russia are the best-documented asteroid impacts of recent times. models that assess the potential danger from such events rely on an accurate picture of their aftermath. here, we re-examine the most critical eyewitness accounts of the tunguska airburst, namely those th... | tunguska eyewitness accounts, injuries, and casualties |
dust and ice mantles on dust grains play an important role in various processes in protoplanetary disks (ppds) around a young star, including planetesimal formation, surface chemistry, and being the reservoir of water in habitable zones. in this paper, we perform two-dimensional modeling of rotational disruption of dus... | rotational disruption of dust and ice by radiative torques in protoplanetary disks and the implications for observations |
the aim of this chapter is to describe available evidence for the existence of relict ocean worlds. the focus is on ceres as a clear example of such a world as indicated by the results from the dawn mission. the sections of this chapter will also reflect the differences and commonalities with other recognized ocean wor... | relict ocean worlds: ceres |
context. because the second reaction wheel failed, a new mission was conceived for the otherwise healthy kepler space telescope. in the course of the k2 mission, the telescope is staring at the plane of the ecliptic. thousands of solar system bodies therefore cross the k2 fields and usually cause additional noise in th... | uninterrupted optical light curves of main-belt asteroids from the k2 mission |
volatile-rich and typically oxidized carbonaceous chondrites, such as cv and cm chondrites, potentially respond to impacts differently than do other chondritic materials. understanding impact melting of carbonaceous chondrites has been hampered by the dearth of recognized impact melt samples. in this study we identify ... | cv and cm chondrite impact melts |
the bulk composition of earth is dramatically carbon-poor compared to that of the interstellar medium, and this phenomenon extends to the asteroid belt. to interpret this carbon deficit problem, the carbonaceous component in grains must have been converted into the gas phase in the inner regions of protoplanetary disks... | the effect of carbon grain destruction on the chemical structure of protoplanetary disks |
we describe epic 205718330 and epic 235240266, two systems identified in the k2 data whose light curves contain episodic drops in brightness with shapes and durations similar to those of the young `dipper' stars, yet shallower by ∼1-2 orders of magnitude. these `little dippers' have diverse profile shapes with duration... | the little dippers: transits of star-grazing exocomets? |
models of terrestrial planet formation predict that the final stages of planetary assembly—lasting tens of millions of years beyond the dispersal of young protoplanetary disks—are dominated by planetary collisions. it is through these giant impacts that planets like the young earth grow to their final mass and achieve ... | carbon monoxide gas produced by a giant impact in the inner region of a young system |
context. asteroids with a diameter of up to a few dozen meters may spin very fast and complete an entire rotation within a few minutes. these small and fast-rotating bodies are thought to be monolithic objects because the gravitational force due to their small size is not strong enough to counteract the strong centripe... | low thermal conductivity of the superfast rotator (499998) 2011 pt |
using the multiband imager mapcam on board the osiris-rex (origins, spectral interpretation, resource identification, and security-regolith explorer) spacecraft, we identified 77 instances of proposed exogenic materials distributed globally on the surface of the b-type asteroid (101955) bennu. we identified materials a... | widely distributed exogenic materials of varying compositions and morphologies on asteroid (101955) bennu |
individual particles from comet 81p/wild 2 collected by nasa's stardust mission vary in size from small sub-μm fragments found in the walls of the aerogel tracks, to large fragments up to tens of μm in size found towards the termini of tracks. the comet, in an orbit beyond neptune since its formation, retains an intact... | oxygen isotopic composition of coarse- and fine-grained material from comet 81p/wild 2 |
the large synoptic survey telescope (lsst) will be a ground-based, optical, all-sky, rapid cadence survey project with tremendous potential for discovering and characterizing asteroids. with lsst's large 6.5m diameter primary mirror, a wide 9.6 square degree field of view 3.2 gigapixel camera, and rapid observational c... | asteroid discovery and characterization with the large synoptic survey telescope |
we determine the absolute magnitude (h) distribution (or size-frequency distribution, sfd; n(h)∝10αh where α is the slope of the distribution) for near-earth objects (neo) with 13 < h < 30 and asteroid retrieval mission (arm) targets with 27 < h < 31 that were detected by the 1st telescope of the panoramic ... | the size-frequency distribution of h > 13 neos and arm target candidates detected by pan-starrs1 |
dormant comets in the near-earth object (neo) population are thought to be involved in the terrestrial accretion of water and organic materials. identification of dormant comets is difficult as they are observationally indistinguishable from their asteroidal counterparts, however, they may have produced dust during the... | dormant comets among the near-earth object population: a meteor-based survey |
we show that the rate of pollution of white dwarfs by asteroidal material implies a concomitant rate of material ejection that can contribute significantly to the population of interstellar minor bodies. we note also that the irradiation during post main sequence evolution implies that much of this ejected material may... | ejection of material—“jurads”—from post-main-sequence planetary systems |
main belt asteroid (6478) gault has been dynamically linked with two overlapping asteroid families: phocaea, dominated by s-type asteroids, and tamara, dominated by low-albedo c-types. this object has recently become an interesting case for study after images obtained in late 2018 revealed that it was active and displa... | physical characterization of active asteroid (6478) gault |
the existence of earth's trojan asteroids is not well constrained and represents a major gap in our inventory of small bodies in near-earth space. their discovery would be of high scientific and human interest. | the case for a deep search for earth's trojan asteroids |
we present v-band photometry of the 20 000 brightest asteroids using data from the all-sky automated survey for supernovae (asas-sn) between 2012 and 2018. we were able to apply the convex inversion method to more than 5000 asteroids with more than 60 good measurements in order to derive their sidereal rotation periods... | v-band photometry of asteroids from asas-sn. finding asteroids with slow spin |
asteroid 162173 ryugu has numerous craters. the initial measurement of impact craters on ryugu, by sugita et al. (2019), is based on hayabusa2 onc images obtained during the first month after the arrival of hayabusa2 in june 2018. utilizing new images taken until february 2019, we constructed a global impact crater cat... | the spatial distribution of impact craters on ryugu |
using viscoelastic mass/spring model simulations, we explore tidal evolution and migration of compact binary asteroid systems. we find that after the secondary is captured into a spin-synchronous state, non-principal axis rotation in the secondary can be long-lived. the secondary's long axis can remain approximately al... | non-principal axis rotation in binary asteroid systems and how it weakens the byorp effect |
we give new decomposition theorems for classes of graphs that can be transduced in first-order logic from classes of sparse graphs -- more precisely, from classes of bounded expansion and from nowhere dense classes. in both cases, the decomposition takes the form of a single colored rooted tree of bounded depth where, ... | treelike decompositions for transductions of sparse graphs |
a widely held assumption is that each single white dwarf containing observable rocky debris requires the presence of at least one terrestrial or giant planet to have gravitationally perturbed the progenitor of the debris into the star. however, these planets could have been previously engulfed by the star or escaped th... | orbit decay of 2-100 au planetary remnants around white dwarfs with no gravitational assistance from planets |
in a work by raz (j. acm and focs 16), it was proved that any algorithm for parity learning on $n$ bits requires either $\omega(n^2)$ bits of classical memory or an exponential number (in~$n$) of random samples. a line of recent works continued that research direction and showed that for a large collection of classical... | memory-sample lower bounds for learning with classical-quantum hybrid memory |
context. it is well known that asteroids and comets fall into the sun. metal pollution of white dwarfs and transient spectroscopic signatures of young stars like β-pic provide growing evidence that extra solar planetesimals can attain extreme orbital eccentricities and fall into their parent stars.aims: we aim to devel... | extreme secular excitation of eccentricity inside mean motion resonance. small bodies driven into star-grazing orbits by planetary perturbations |
mean motion resonances (mmrs) play an important role in the formation and evolution of planetary systems and have significantly influenced the orbital properties and distribution of planets and minor planets in the solar system and in exoplanetary systems. most previous theoretical analyses have focused on the low- to ... | mean motion resonances at high eccentricities: the 2:1 and the 3:2 interior resonances |
asteroid families are groups of asteroids that are the product of collisions or of the rotational fission of a parent object. these groups are mainly identified in proper elements or frequencies domains. because of robotic telescope surveys, the number of known asteroids has increased from ${\simeq}10\, 000$ in the ear... | machine learning classification of new asteroid families members |
we report near-infrared (0.7-2.5 μm) reflectance spectra for each of the six target asteroids of the forthcoming nasa discovery-class mission lucy. five jupiter trojans (the binary (617) patroclus system, (3548) eurybates, (21900) orus, (11351) leucus, and (15094) polymele) are well characterized, with measurable spect... | compositional constraints for lucy mission trojan asteroids via near-infrared spectroscopy |
a new era of up-close asteroid exploration has been entered in the 21st century. however, the widely rugged terrain and microgravity field of asteroids still pose significant challenges to the stable landing of spacecraft and may even directly lead to the escape of the explorer. owing to the substantial energy dissipat... | dynamical behavior of flexible net spacecraft for landing on asteroid |
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