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rock boulders are typical features of the surfaces of many airless bodies, so the possibility of estimating their potential survival times may provide insights into the rates of surface-modification processes. as an opening point of this study we employ estimates of the survival times of meter-sized boulders on the sur... | survival times of meter-sized rock boulders on the surface of airless bodies |
we present a paleomagnetic study of seven cm carbonaceous chondrites. cm chondrites are believed to be some of the most chemically primitive materials available in our solar system and may sample the continuum of transitional objects between asteroids and comets formed in the outer solar system. as such, cm chondrites ... | an early solar system magnetic field recorded in cm chondrites |
the mascot camera (mascam) is part of the mobile asteroid surface scout (mascot) lander's science payload. mascot has been launched to asteroid (162173) ryugu onboard jaxa's hayabusa 2 asteroid sample return mission on dec 3rd, 2014. it is scheduled to arrive at ryugu in 2018, and return samples to earth by 2020. masca... | the camera of the mascot asteroid lander on board hayabusa 2 |
asteroid (3200) phaethon is an active near-earth asteroid and the parent body of the geminid meteor shower. because of its small perihelion distance, phaethon's surface reaches temperatures sufficient to destabilize hydrated materials. we conducted rotationally resolved spectroscopic observations of this asteroid, most... | near-infrared observations of active asteroid (3200) phaethon reveal no evidence for hydration |
near earth asteroids are attractive targets for new space missions; firstly, because of their scientific importance, but also because of their impact threat and prospective resources. the asteroid retrieval mission concept has thus arisen as a synergistic approach to tackle these three facets of interest in one single ... | asteroid retrieval missions enabled by invariant manifold dynamics |
nasa's osiris-rex asteroid sample return mission spacecraft includes the touch and go camera system (tagcams) three camera-head instrument. the purpose of tagcams is to provide imagery during the mission to facilitate navigation to the target asteroid, confirm acquisition of the asteroid sample, and document asteroid s... | touch and go camera system (tagcams) for the osiris-rex asteroid sample return mission |
context. the esa euclid mission has been designed to map the geometry of the dark universe. scheduled for launch in 2020, it will conduct a six-year visible and near-infrared imaging and spectroscopic survey over 15 000 deg2 down to vab ~ 24.5. although the survey will avoid ecliptic latitudes below 15°, the survey pat... | solar system science with esa euclid |
we describe castalia, a proposed mission to rendezvous with a main belt comet (mbc), 133p/elst-pizarro. mbcs are a recently discovered population of apparently icy bodies within the main asteroid belt between mars and jupiter, which may represent the remnants of the population which supplied the early earth with water.... | the castalia mission to main belt comet 133p/elst-pizarro |
hypervelocity impacts cause significant heating of planetary bodies. such events are recorded by a reset of 40ar-36ar ages and/or impact melts. here we investigate the influence of friction and plastic deformation in shock-generated comminuted rocks on the degree of impact heating using the isale shock-physics code. we... | effects of friction and plastic deformation in shock-comminuted damaged rocks on impact heating |
asteroids can be classified into several groups based on their spectral reflectance. among these groups, the one belonging to the l-class in the taxonomic classification based on visible and near-infrared spectra exhibit several peculiar properties. first, their near-infrared spectrum is characterized by a strong absor... | new polarimetric and spectroscopic evidence of anomalous enrichment in spinel-bearing calcium-aluminium-rich inclusions among l-type asteroids |
we report a petrography, mineral chemistry, oxygen and chromium isotopic study of grove mountains (grv) 020043 together with a subset of other acapulcoites and lodranites. grv 020043 is a petrologic type 4 chondrite, with chondrules of diverse types and sizes, and is composed of low-ca pyroxene (40 vol.%), olivine (24 ... | evidence for a multilayered internal structure of the chondritic acapulcoite-lodranite parent asteroid |
context. the sloan digital sky survey (sdss) and wide-field infrared survey explorer (wise) provide information about the surface composition of about 100 000 minor planets. the resulting visible colors and albedos enabled us to group them in several major classes, which are a simplified view of the diversity shown by ... | near-infrared colors of minor planets recovered from vista-vhs survey (movis) |
white dwarf wd 1145+017 is orbited by several clouds of dust, possibly emanating from actively disintegrating bodies. these dust clouds reveal themselves through deep, broad, and evolving transits in the star's light curve. here, we report two epochs of multiwavelength photometric observations of wd 1145+017, including... | a dearth of small particles in the transiting material around the white dwarf wd 1145+017 |
we present new observational data for selected main-belt asteroids of different compositional types. the detailed magnitude-phase dependences including small phase angles (<1°) were obtained for these asteroids, namely: (10) hygiea (down to the phase angle of 0.3°, c-type), (176) iduna (0.2°, g-type), (214) aschera ... | asteroid observations at low phase angles. iv. average parameters for the new h, g1, g2 magnitude system |
we observed the l4 jupiter trojans (jts) swarm using the hyper suprime-cam attached to the 8.2 m subaru telescope on 2015 march 30 (ut). the survey covered ∼26 deg2 of sky area near the opposition and around the ecliptic plane with a 240 s exposure time in the r-band filter through the entire survey. we detected 631 l4... | small jupiter trojans survey with the subaru/hyper suprime-cam |
the recently discovered object p/2019 ld2 (by the asteroid terrestrial-impact last alert system) was initially thought to be a jupiter trojan asteroid, until dynamical studies and the appearance of persistent cometary activity revealed that this object is actually an active centaur. however, the dynamical history, ther... | p/2019 ld2 (atlas): an active centaur in imminent transition to the jupiter family |
how rare are extreme-spin primordial black holes? we show how, from an underlying distribution of primordial black hole (pbh) spin, extreme-value statistics can be used to quantify the rarity of spinning pbhs with kerr parameter close to 1. using the peaks-over-threshold method, we show how the probability that a pbh f... | extreme-value statistics of the spin of primordial black holes |
context. the hubble space telescope (hst) archives constitute a rich dataset of high-resolution images to mine for strong gravitational lenses. while many hst programmes specifically target strong lenses, they can also be present by coincidence in other hst observations.aims: our aim is to identify non-targeted strong ... | hubble asteroid hunter. ii. identifying strong gravitational lenses in hst images with crowdsourcing |
as part of the international asteroid warning network's observational exercises, we conducted a campaign to observe near-earth asteroid 2019 xs around its close approach to earth on 2021 november 9. the goal of the campaign was to characterize errors in the observation times reported to the minor planet center, which b... | international asteroid warning network timing campaign: 2019 xs |
we present an update to the first white-light detections of a dust trail observed closely following the orbit of asteroid (3200) phaethon, as seen by the wide-field imager for the parker solar probe instrument on the nasa parker solar probe mission. here, we provide a summary and analysis of observations of the dust tr... | continued psp/wispr observations of a phaethon-related dust trail |
the statistics of nonlinear processes in avalanching systems, based on the self-organized criticality (soc) concept of bak et al. (1988), predicts power-law-like size (or occurrence frequency) distribution functions. following up on previous work, we define a standard soc model in terms of six assumptions: (i) area fra... | the fractality and size distributions of astrophysical self-organized criticality systems |
the touch and go camera system (tagcams) is a three-camera-head instrument onboard nasa's osiris-rex asteroid sample return mission spacecraft. the purpose of tagcams is to facilitate navigation to the target asteroid, (101955) bennu; confirm acquisition of the asteroid sample; document asteroid sample stowage; and pro... | in-flight calibration and performance of the osiris-rex touch and go camera system (tagcams) |
the abundant phyllosilicate and carbonate minerals characterizing most of the returned particles from asteroid ryugu suggest a history of extensive aqueous alteration on its parent body, similar to the rare mineralogically altered, but chemically primitive, ci (ivuna-type) chondrite meteorites. particle c0009 differs m... | incorporation of 16o-rich anhydrous silicates in the protolith of highly hydrated asteroid ryugu |
dynamic models of solar system evolution suggest that d-type asteroids formed beyond saturn's orbit and represent invaluable witnesses of the prevailing conditions in the outer solar system. here, we report a comprehensive petrographic and isotopic characterization of the carbonaceous chondrite tarda, a recent fall rec... | the tarda meteorite: a window into the formation of d-type asteroids |
nasa sent the double asteroid redirection test (dart) mission to impact dimorphos, the satellite of the asteroid binary system (65803) didymos. dart will release liciacube prior to impact to obtain high-resolution post-impact images. the impact will produce a crater and a large amount of material ejected at high speed ... | lofting of low-speed ejecta produced in the dart experiment and production of a dust cloud |
ground-based radar systems are critical for physical and dynamical characterization of near-earth objects (neos) and space debris. the operational aspect and applications of radar for planetary defense and space situational/domain awareness (ssa/sda) are similar, but there are some factors that should be taken into acc... | the arecibo observatory's legacy and future radar capabilities |
this paper presents a method for rapid generation of three-dimensional low-thrust trajectories that utilizes fourier series for shaping the position vector. the generated trajectories are feasible with respect to the given thrust acceleration constraints. an objective function is defined representing the overall missio... | initial three-dimensional low-thrust trajectory design |
olivine occurs across the galaxy, from earth to extraterrestrial bodies including the moon, mars, and asteroids, to particles of comet dust and distant debris disks. the mineral is critical to our understanding of early solar system chronology, planetary formation processes (e.g., magma ocean solidification), crustal e... | galaxy of green |
in this study, systematic rock magnetic measurements and saturation isothermal remanent magnetization (sirm) paleointensity calibration experiments were conducted for the returned samples from c-type asteroid (162173) ryugu and two carbonaceous chondrites (orgueil and tagish lake) to evaluate the remanence carriers of ... | rock magnetic characterization of returned samples from asteroid (162173) ryugu: implications for paleomagnetic interpretation and paleointensity estimation |
interstellar objects are a category of comets and asteroids that offer a unique scientific opportunity to answer fundamental scientific questions about the origin of solar system volatiles, the compositions of exo-solar systems, and the transfer rates of material between solar systems. however, they are also difficult ... | high-performance solar sails for interstellar object rendezvous |
the double asteroid redirection test (dart) is the first planetary defense test mission. it will demonstrate the kinetic impactor technique by intentionally colliding the dart spacecraft with the near-earth asteroid dimorphos. the main dart spacecraft is accompanied by the italian space agency light italian cubesat for... | shape modeling of dimorphos for the double asteroid redirection test (dart) |
in this work, we divide the classic "lunar megaregolith" layer into three distinct regions: (1) a surficial regolith layer, about 5-20 m in depth, consisting of loose, unconsolidated fines and breccia, and characterized by frequent overturn and comminution caused by small impacts; (2) an upper megaregolith layer, about... | modeling the formation of the lunar upper megaregolith layer |
previous observations suggested that ceres has active, but possibly sporadic, water outgassing as well as possibly varying spectral characteristics over a timescale of months. we used all available data of ceres collected in the past three decades from the ground and the hubble space telescope, as well as the newly acq... | surface albedo and spectral variability of ceres |
main-belt asteroid (6478) gault unexpectedly sprouted two tails in late 2018 and early 2019, identifying it as a new active asteroid. here we present observations obtained by the 1.2 m zwicky transient facility survey telescope that provide detailed time-series coverage of the onset and evolution of gault’s activity. g... | multiple outbursts of asteroid (6478) gault |
a heliogyro is a rotating solar sail with the reflecting surface divided into a number of long and slender blades, which are stiffened by a spin-induced centrifugal force. each blade can rotate around its own longitudinal axis so as to change the pitch angle and allow the thrust vector to be effectively controlled. the... | optimal heliocentric transfers of a sun-facing heliogyro |
in the dusk of the mesozoic, advanced duck-billed dinosaurs (hadrosauridae) were so successful that they likely outcompeted other herbivores, contributing to declines in dinosaur diversity. from laurasia, hadrosaurids dispersed widely, colonizing africa, south america, and, allegedly, antarctica. here, we present the f... | relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic chile |
this paper presents methodologies for constructing control barrier functions (cbfs) for nonlinear, control-affine systems, in the presence of input constraints and bounded disturbances. more specifically, given a constraint function with high-relative-degree with respect to the system dynamics, the paper considers thre... | robust control barrier functions under high relative degree and input constraints for satellite trajectories |
we show that a number of claims made in myhrvold (2018) (hereafter m2018b) regarding the wise data and thermal modeling of asteroids are incorrect. that paper provides thermal fit parameter outputs for only two of the about 150,000 object dataset and does not make a direct comparison to asteroids with diameters measure... | response to "an empirical examination of wise/neowise asteroid analysis and results" |
the influence of lineaments, lineament intersections and geology on the groundwater yield of the basement terrain of ondo state was investigated using optical remote sensing data, aster dem, geology, and borehole yield data. landsat-7 etm+ and aster dem were processed to generate composite lineament map. the study area... | investigation of the influence of lineaments, lineament intersections and geology on groundwater yield in the basement complex terrain of ondo state, southwestern nigeria |
the osiris-rex laser altimeter (ola) is a scanning lidar instrument with a high measurement rate of 10 khz and a dexterous two-axis mirror. ola is optimized for proximity operations (< 7 km range) around a small asteroid. the high repetition rate and scanning capability of the instrument give ola the ability to rapi... | global shape modeling using the osiris-rex scanning laser altimeter |
we report the detection of a large-amplitude mir outburst in the white dwarf (wd) 0145+234 in the neowise survey data. the source had a stable mir flux before 2018, and was brightened by about 1.0 magnitude in the w1 and w2 bands within half a year and has been continuously brightening since then. no significant variat... | an ongoing mid-infrared outburst in the white dwarf 0145+234: catching in action the tidal disruption of an exoasteroid? |
motions of spacecraft in non-synchronized binary asteroid systems are facing significant dynamics problems due to the irregular-shaped primaries and time-varying gravitational field. this paper presents a novel method for the design and maintenance of bounded trajectory in the vicinity of non-synchronized binary system... | bounded trajectory design and self-adaptive maintenance control near non-synchronized binary systems comprised of small irregular bodies |
by investigating the petrology and chemical composition of type ii (feo-rich) chondrules in the mighei-like carbonaceous (cm) chondrites we constrain their thermal histories and relationship to the ornans-like carbonaceous (co) chondrites. we identified feo-rich relict grains in type ii chondrules by their fe/mn ratios... | cm and co chondrites: a common parent body or asteroidal neighbors? insights from chondrule silicates |
we present dual-band herschel/pacs imaging for 59 main-sequence stars with known warm dust (t warm ∼ 200 k), characterized by spitzer. of 57 debris disks detected at herschel wavelengths (70 and/or 100 and 160 μm), about half have spectral energy distributions (seds) that suggest two-ring disk architectures mirroring t... | herschel-resolved outer belts of two-belt debris disks—evidence of icy grains |
the vega planetary system hosts the archetype of extrasolar kuiper belts and is rich in dust from the sub-astronomical unit region out to hundreds of astronomical units, suggesting intense dynamical activity. we present atacama large millimeter/submillimeter array (alma) millimeter observations that detect and resolve ... | dust populations in the iconic vega planetary system resolved by alma |
aims: trojans are defined as objects that share the orbit of a planet at the stable lagrangian points l4 and l5. in the solar system, these bodies show a broad size distribution ranging from micrometer (μm) to centimeter (cm) particles (trojan dust) and up to kilometer (km) rocks (trojan asteroids). it has also been th... | dust trapping around lagrangian points in protoplanetary disks |
computer-aided polyp detection (cade) is becoming a standard, integral part of any modern colonoscopy system. a typical colonoscopy cade detects a polyp in a single frame and does not track it through the video sequence. yet, many downstream tasks including polyp characterization (cadx), quality metrics, automatic repo... | self-supervised polyp re-identification in colonoscopy |
the discovery of 1i/‘oumuamua confirmed that planetesimals must exist in great numbers in interstellar space. originally generated during planet formation, they are scattered from their original systems and subsequently drift through interstellar space. as a consequence they should seed molecular clouds with at least h... | a hypothesis for the rapid formation of planets |
we study imaging of point sources with a quadrupole gravitational lens while focusing on the formation and evolution of the einstein cross formed on the image sensor of an imaging telescope. for this, we consider the optical properties of an oblate gravitational lens that is characterized, in addition to a monopole pot... | wave-optical study of the einstein cross formed by a quadrupole gravitational lens |
the gravitational coupling of nearby massive bodies to test masses in a gravitational wave (gw) detector cannot be shielded and gives rise to "gravity gradient noise" (ggn) in the detector. in this paper we show that for any gw detector using local test masses in the inner solar system, the ggn from the motion of the f... | gravity gradient noise from asteroids |
we develop a shape model of asteroid 16 psyche using observations acquired in a wide range of wavelengths: arecibo s-band delay-doppler imaging, atacama large millimeter array (alma) plane-of-sky imaging, adaptive optics (ao) images from keck and the very large telescope (vlt), and a recent stellar occultation. our sha... | asteroid 16 psyche: shape, features, and global map |
we present deep hubble space telescope/space telescope imaging spectrograph coronagraphic images of the β pic debris disk obtained at two epochs separated by 15 yr. the new images and the re-reduction of the 1997 data provide the most sensitive and detailed views of the disk at optical wavelengths as well as the yet sm... | the inner disk structure, disk-planet interactions, and temporal evolution in the β pictoris system: a two-epoch hst/stis coronagraphic study |
context. information about shapes and spin states of individual asteroids is important for the study of the whole asteroid population. for asteroids from the main belt, most of the shape models available now have been reconstructed from disk-integrated photometry by the lightcurve inversion method.aims: we want to sign... | asteroid models from the lowell photometric database |
context. asteroids smaller than about 100 m in diameter are observed to rotate very fast, with periods often much shorter than the critical spin limit of 2.2 h. some of these super-fast rotators can also achieve a very large semimajor axis drift induced by the yarkovsky effect, which, in turn, is determined by internal... | the low surface thermal inertia of the rapidly rotating near-earth asteroid 2016 ge1 |
the first known interstellar object ’oumuamua exhibited a nongravitational acceleration that appeared inconsistent with cometary outgassing, leaving radiation pressure as the most likely force. barring the alien lightsail hypothesis, an ultra-low density due to a fractal structure might also explain the acceleration of... | the interstellar object ’oumuamua as a fractal dust aggregate |
anisotropic outgassing from comets exerts a torque sufficient to rapidly change the angular momentum of the nucleus, potentially leading to rotational instability. here, we use empirical measures of spin changes in a sample of comets to characterize the torques, and to compare them with expectations from a simple model... | systematics and consequences of comet nucleus outgassing torques |
this study presents the analysis of forced photometry data in the o and c filters of centaurs 29p/schwassmann-wachmann and (2060) chiron obtained by the atlas network between 2015 and 2022. centaur 29p had 24 outbursts with a median peak brightness of -3.0 and a range of -3.7 mag, regardless of spectral band. some of t... | a photometric study of centaurs 29p/schwassmann-wachmann and (2060) chiron |
the first large interstellar object discovered near earth by the pan starrs telescope, `oumuamua, showed half a dozen anomalies relative to comets or asteroids in the solar system. all natural-origin interpretations of `oumuamua's anomalies contemplated objects of a type never seen before, such as a porous cloud of dus... | on the possibility of an artificial origin for `oumuamua |
the galileo project is the first systematic scientific research program in the search for potential astro-archaeological artifacts or remnants of extraterrestrial technological civilizations (etcs) or potentially active equipment near earth. taking a path not taken, it conceivably may pick some low-hanging fruit, and w... | overview of the galileo project |
cosmologies in which dark matter clumps strongly on small scales are unfavorable to terrestrial detectors that are as yet unexposed to the clumps. i show that sub-hectometer clumps could trigger thermonuclear runaways by scattering on nuclei in white dwarf cores (carbon and oxygen) and neutron star oceans (carbon), set... | supernovae and superbursts by dark matter clumps |
the sariçiçek howardite meteorite shower consisting of 343 documented stones occurred on september 2, 2015 in turkey and is the first documented howardite fall. cosmogenic isotopes show that sariçiçek experienced a complex cosmic-ray exposure history, exposed during 12-14 ma in a regolith near the surface of a parent a... | the sariçiçek howardite fall in turkey: source crater of hed meteorites on vesta and impact risk of vestoids |
in the last two decades, new computational tools have been developed in order to aid space missions to orbit around irregular small bodies. one of the techniques consists in rebuilding their shape in tetrahedral polyhedron. this method is well suited to determine the shape and estimate certain physical features of aste... | mascon gravitation model using a shaped polyhedral source |
to improve the autonomy and reliability of asteroid landing control, a fast solution continuation approach for time-optimal asteroid landing trajectories is presented in this study. the contributions of this study are threefold. first, a deep neural network (dnn) is developed to approximate the gravitational field of a... | fast solution continuation of time-optimal asteroid landing trajectories using deep neural networks |
theory and previous space missions indicate there are several populations of zodiacal dust. the most prominent populations are grains on bound elliptic orbits (α-meteoroids), and β-meteoroids on hyperbolic escape trajectories governed largely by their size and composition. yet, there may be other populations not yet co... | dust directionality and an anomalous interplanetary dust population detected by the parker solar probe |
in order to understand the geological evolution of asteroids eros, itokawa and ryugu and their collisional history, previous studies investigated boulder size distributions on their surfaces. however, quantitative comparison of these size distributions is hampered by numerous differences between these studies regarding... | boulder sizes and shapes on asteroids: a comparative study of eros, itokawa and ryugu |
the surface of the rubble-pile asteroid (101955) bennu has been characterized in detail by the osiris-rex (origins, spectral interpretation, resource identification, and security-regolith explorer) mission. by examining global and local digital terrain models, we observed that bennu possesses terraces, that is, a serie... | the formation of terraces on asteroid (101955) bennu |
the sun-earth triangular lagrange point, l 5, offers an ideal location to monitor the space weather. furthermore, l 4, l 5 may harbor earth `trojan' asteroids and space dust that are of significant interest to the scientific community. no spacecraft has, thus far, entered an orbit in the vicinity of sun-earth triangula... | solar sail transfers and trajectory design to sun-earth l 4, l 5: solar observations and potential earth trojan exploration |
laser ablation inductively coupled plasma-mass spectrometry (la-icp-ms) u-pb geochronology of shocked zircon grains in a vesicular-fluidal impact melt rock from the ≥54 km charlevoix impact structure, québec, canada, suggests an ordovician to silurian age of 450 ± 20 ma for the impact. this age is anchored by concordan... | in situ u-pb analysis of shocked zircon from the charlevoix impact structure, québec, canada |
we present the results of "snapshot" numerical integrations of test particles representing comet-like and asteroid-like objects in the inner solar system aimed at investigating the short-term dynamical evolution of objects close to the dynamical boundary between asteroids and comets as defined by the tisserand paramete... | potential jupiter-family comet contamination of the main asteroid belt |
differentiated asteroids are rare in the main asteroid belt despite evidence for ∼ 100 distinct differentiated bodies in the meteorite record. we have sought to understand why so few main-belt asteroids differentiated and where those differentiated bodies or fragments reside. using the sloan digital sky survey (sdss) t... | olivine-dominated a-type asteroids in the main belt: distribution, abundance and relation to families |
the jaxa/isas spacecraft destiny+ will be launched to the active asteroid (3200) phaethon in 2022. among the proposed core payload is the destiny+ dust analyzer (dda) which is an upgrade of the cosmic dust analyzer flown on the cassini spacecraft to saturn (srama et al., 2011). we use two up-to-date computer models, th... | modelling destiny+ interplanetary and interstellar dust measurements en route to the active asteroid (3200) phaethon |
it has been hypothesized that the impactors that created the majority of the observable craters on the ancient lunar highlands were derived from the main asteroid belt in such a way that preserved their size-frequency distribution (strom, r.g., malhotra, r., ito, t., yoshida, f., kring, d.a. [2005]. science 309, 1847-1... | re-examining the main asteroid belt as the primary source of ancient lunar craters |
this paper presents transition of the failure mode of a cohesive, spherical body due to the yarkovsky-o'keefe-radzievskii-paddack (yorp) spin-up. on the assumption that the distribution of materials in the body is homogeneous, failed regions first appearing in the body at different spin rates are predicted by comparing... | failure modes and conditions of a cohesive, spherical body due to yorp spin-up |
we analyzed the warm spitzer/irac data of kic 8462852. we found no evidence of infrared excess at 3.6 μm and a small excess of 0.43 ± 0.18 mjy at 4.5 μm below the 3σ threshold necessary to claim a detection. the lack of strong infrared excess 2 years after the events responsible for the unusual light curve observed by ... | kic 8462852: the infrared flux |
the innermost section of the solar system has not been extensively studied because minor bodies moving inside earth's orbit tend to spend most of their sidereal orbital periods at very low solar elongation, well away from the areas more frequently observed by programs searching for near-earth objects. the survey carrie... | on the orbital evolution of 2020 av2, the first asteroid ever observed to go around the sun inside the orbit of venus |
active asteroids behave dynamically like asteroids but display comet-like comae. these objects are poorly understood, with only about 30 identified to date. we have conducted one of the deepest systematic searches for asteroid activity by making use of deep images from the dark energy camera (decam) ideally suited to t... | safari: searching asteroids for activity revealing indicators |
asteroid 162173 ryugu and asteroid 101955 bennu, which were recently visited by spacecraft hayabusa2 and osiris-rex, respectively, are spinning top-shaped rubble piles. other axisymmetric top-shaped near-earth asteroids have been observed with ground-based radar, most of which rotate near breakup rotation periods of ∼ ... | sph simulations for shape deformation of rubble-pile asteroids through spinup: the challenge for making top-shaped asteroids ryugu and bennu |
context. the vast majority of the geophysical and geological constraints (e.g., internal structure, cratering history) for main-belt asteroids have so far been obtained via dedicated interplanetary missions (e.g., esa rosetta, nasa dawn). the high angular resolution of sphere/zimpol, the new-generation visible adaptive... | the impact crater at the origin of the julia family detected with vlt/sphere? |
the migrations of solid objects throughout the solar system are thought to have played key roles in disk evolution and planet formation. however, our understanding of these migrations is limited by a lack of quantitative constraints on their timings and distances recovered from laboratory measurements of meteorites. th... | constraints on the distances and timescales of solid migration in the early solar system from meteorite magnetism |
white dwarfs (wds) often show metal lines in their spectra, indicating accretion of asteroidal material. our sun is to become a wd in several gigayears. here, we examine how the solar wd accretes from the three major small body populations: the main belt asteroids (mbas), jovian trojan asteroids (jtas), and trans-neptu... | metal pollution of the solar white dwarf by solar system small bodies |
small asteroids are often considered to be rubble-pile objects, and such asteroids may be the most likely type of near earth objects (neos) to pose a threat to earth. however, impact cratering on such bodies is complex and not yet understood. we perform three low-velocity (≈ 400 m/s) impact experiments in granular targ... | boulder exhumation and segregation by impacts on rubble-pile asteroids |
indirect optimization methods convert optimal control problems (ocps) into two- or multi-point boundary-value problems. a highly desirable feature of indirect methods, specifically for space applications, is that high-resolution trajectories can be generated, which satisfy the first-order necessary conditions of optima... | a composite framework for co-optimization of spacecraft trajectory and propulsion system |
context. on september 26, 2022, the double asteroid redirection test (dart) successfully changed the trajectory of the asteroid dimorphos (i.e. 65803 didymos i), a satellite circling (65803) didymos.aims: we aim to characterize the consequence of this collision and derive the physical properties of the ejecta features ... | physical properties of the didymos system before and after the dart impact |
the shower database (sd) of the meteor data center (mdc) had been operating on the basis of stream-naming rules which were too complex and insufficiently precise for 15 years. with a gradual increase in the number of discovered meteor showers, the procedure for submitting new showers to the database and naming them led... | new nomenclature rules for meteor showers adopted |
near-earth asteroid (101955) bennu is an active asteroid experiencing mass loss. the activity manifests itself in the form of ejection events emitting up to hundreds of millimeter- to centimeter-scale particles. the origins, spectral interpretation, resource identification, and security-regolith explorer spacecraft mon... | introduction to the special issue: exploration of the activity of asteroid (101955) bennu |
following the report of a new hard x-ray transient swift j1727.8-1613 (grb 230824a, gcn #34537, atel #16205), we obtained forced photometry measurements at the location reported in gcn #34543 on images taken by the asteroid terrestrial-impact last alert system (atlas; tonry et al. 2018). | atlas constraints on the optical onset of new x-ray transient swift j1727.8-1613 |
in space operation of the microwave discharge ion thruster μ10 on the asteroid explorers hayabusa and hayabusa2, the propellant utilization efficiency deteriorated much more than in the ground endurance test. in this study, a fault tree analysis and experimental simulations of space operation were performed, focusing o... | investigation and experimental simulation of performance deterioration of microwave discharge ion thruster μ10 during space operation |
paleomagnetic measurements of ancient terrestrial and extraterrestrial samples indicate that numerous planetary bodies generated magnetic fields through core dynamo activity during the early solar system. the existence, timing, intensity and stability of these fields are governed by the internal transfer of heat throug... | constraints on asteroid magnetic field evolution and the radii of meteorite parent bodies from thermal modelling |
the biogenic elements, h, c, n, o, p and s, have a long cosmic history, whose evolution can still be observed in diverse locales of the known universe, from interstellar clouds of gas and dust, to pre-stellar cores, nebulas, protoplanetary discs, planets and planetesimals. the best analytical window into this cosmochem... | carbonaceous chondrite meteorites: the chronicle of a potential evolutionary path between stars and life |
carbonaceous chondrites are fragments from primitive parent asteroids, which represent some of the most primitive meteorites accessible for laboratory analysis and offer therefore the best opportunity to explore the chemical and physical conditions in the early solar system. here, we report the identification of presol... | ancient stardust in fine-grained chondrule dust rims from carbonaceous chondrites |
asteroid anchoring is the premise for the spacecraft to conduct in-situ scientific exploration on the surface of a weak gravitational asteroid. there is not any precedent for successful anchoring on the asteroid surface all over the world. ultrasonic drill actuated by the piezoelectric ceramic is especially suitable fo... | an asteroid anchoring method based on cross-drilling geometric force closure of ultrasonic drill |
the resurfacing process on ryugu accompanying the artificial impact crater formation by hayabusa2's small carry-on impactor (sci) was studied by comparing pre- and post-impact images of this region captured by an optical navigation camera. three different aspects of the resurfacing process were examined: the crater rim... | resurfacing processes on asteroid (162173) ryugu caused by an artificial impact of hayabusa2's small carry-on impactor |
we have conducted a nanosims-based search for presolar material in samples recently returned from c-type asteroid ryugu as part of jaxa's hayabusa2 mission. we report the detection of all major presolar grain types with o- and c-anomalous isotopic compositions typically identified in carbonaceous chondrite meteorites: ... | presolar stardust in asteroid ryugu |
the small carry-on impactor (sci) equipped on hayabusa2 was developed to produce an artificial impact crater on the primitive near-earth asteroid (nea) 162173 ryugu (ryugu) in order to explore the asteroid subsurface material unaffected by space weathering and thermal alteration by solar radiation. an exposed fresh sur... | scientific objectives of small carry-on impactor (sci) and deployable camera 3 digital (dcam3-d): observation of an ejecta curtain and a crater formed on the surface of ryugu by an artificial high-velocity impact |
carbonaceous chondrites are meteorites believed to preserve our planet's source materials, but the precise nature of these materials still remains uncertain. to uncover pristine planetary materials, we performed synchrotron radiation-based x-ray computed nanotomography of a primitive carbonaceous chondrite, acfer 094, ... | discovery of fossil asteroidal ice in primitive meteorite acfer 094 |
by investigating the in situ chemical and o-isotope compositions of olivine in lightly sintered dust agglomerates from the early solar system, we constrain their origins and the retention of dust in the protoplanetary disk. the grain sizes of silicates in these agglomeratic olivine (ao) chondrules indicate that the gra... | the retention of dust in protoplanetary disks: evidence from agglomeratic olivine chondrules from the outer solar system |
here were report on a laboratory study aiming to reproduce specificities of near-earth asteroid. we study how the elevated surface temperature, their surface roughness (rock or regolith), as well as observation geometry can affect the absorption features detected on asteroids. for that purpose, we selected a recent car... | some things special about neas: geometric and environmental effects on the optical signatures of hydration |
following its flyby and first imaging of the pluto-charon binary, the new horizons spacecraft visited the kuiper belt object (kbo) 2014 mu69 (also known as (486958) arrokoth). the imaging showed mu69 to be a contact binary that rotates at a low spin period (15.92 hours), is made of two individual lobes connected by a n... | the wide-binary origin of (2014) mu69-like kuiper belt contact binaries |
context. the population of near-earth asteroids (neas) shows a large variety of objects in terms of physical and dynamical properties. they are subject to planetary encounters and to strong solar wind and radiation effects. their study is also motivated by practical reasons regarding space exploration and long-term pro... | near-earth asteroids spectroscopic survey at isaac newton telescope |
observed hyperbolic minor bodies might have an interstellar origin, but they can be natives of the solar system as well. fly-bys with the known planets or the sun may result in the hyperbolic ejection of an originally bound minor body; in addition, members of the oort cloud could be forced to follow inbound hyperbolic ... | where the solar system meets the solar neighbourhood: patterns in the distribution of radiants of observed hyperbolic minor bodies |
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