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recent advances in our understanding of the dynamical history of the solar system have altered the inferred bombardment history of the earth during accretion of the late veneer, after the moon-forming impact. we investigate how the bombardment by planetesimals left-over from the terrestrial planet region after terrestr... | evolution of the earth's atmosphere during late veneer accretion |
the impact of the double asteroid redirection test spacecraft into dimorphos, moon of the asteroid didymos, changed dimorphos's orbit substantially, largely from the ejection of material. we present results from 12 earth-based facilities involved in a world-wide campaign to monitor the brightness and morphology of the ... | ejecta evolution following a planned impact into an asteroid: the first five weeks |
we performed in-situ analysis on a ~ 1 mm-sized grain a0080 returned by the hayabusa2 spacecraft from near-earth asteroid (162173) ryugu to investigate the relationship of soluble organic matter (som) to minerals. desorption electrospray ionization-high resolution mass spectrometry (desi-hrms) imaging mapped more than ... | the spatial distribution of soluble organic matter and their relationship to minerals in the asteroid (162173) ryugu |
the sensitivity of alma makes it possible to detect thermal mm/submm emission from small and/or distant solar system bodies at the sub-mjy level. while the measured fluxes are primarily sensitive to the objects' diameters, deriving precise sizes is somewhat hampered by the uncertain effective emissivity at these wavele... | the thermal emission of centaurs and trans-neptunian objects at millimeter wavelengths from alma observations |
the lucy mission to the trojan asteroids in jupiter's orbit carries an instrument named l'ralph, a visible/near infrared multi-spectral imager and a short wavelength infrared hyperspectral imager. it is one of the core instruments on lucy, nasa's first mission to the trojans. l'ralph's primary purpose is to map the sur... | l'ralph: a visible/infrared spectral imager for the lucy mission to the trojans |
we present our follow-up observations with grandma of transient sources revealed by the zwicky transient facility (ztf). over a period of six months, all ztf alerts were examined in real time by a dedicated science module implemented in the fink broker, which will be used in filtering of transients discovered by the ve... | grandma observations of ztf/fink transients during summer 2021 |
recently, remarkable antiglitch and glitch accompanied by bright radio bursts of the galactic magnetar sgr j1935+2154 were discovered. these two infrequent temporal coincidences between the glitch/antiglitch and the fast radio burst (frb)-like bursts reveal their physical connection of them. here, we propose that the a... | tidal capture of an asteroid by a magnetar: frb-like bursts, glitch, and antiglitch |
the didymos binary asteroid was the target of the double asteroid redirection test (dart) mission, which intentionally impacted dimorphos, the smaller member of the binary system. we used the near-infrared spectrograph and mid-infrared instrument instruments on jwst to measure the 0.6-5 and 5-20 μm spectra of didymos a... | near to mid-infrared spectroscopy of (65803) didymos as observed by jwst: characterization observations supporting the double asteroid redirection test |
for a rendezvous space mission to a small body, the gravity field is usually modeled with large uncertainty in the preliminary mission design. consequently, the orbital motion in the vicinity of the body cannot be predicted accurately. in this research, the automatic domain splitting (ads) method is applied as an indic... | dynamical structure of the motion around asteroids with uncertain gravity and solar radiation pressure |
nasa's first asteroid sample return mission, osiris-rex, collected a sample from the surface of near-earth asteroid bennu in october 2020 and will deliver it to earth in september 2023. selecting a sample collection site on bennu's surface was challenging due to the surprising lack of large ponded deposits of regolith ... | assessing the sampleability of bennu's surface for the osiris-rex asteroid sample return mission |
finding a common origin for various celestial bodies, especially the relations between meteoroid streams, comets and asteroids (possibly extinct comets), remains one of the important problems in solar system astronomy. different criteria, starting with one by southworth and hawkins, have been used for this purpose. ide... | metrics in the space of orbits and their application to searching for celestial objects of common origin |
in this paper, we investigate the stability of earth co-orbital objects (ecos) based on the torus structure. the hamiltonian value is an index to evaluate co-orbital stability. according to topological characters of tadpole (tp), horseshoe (hs), quasi-satellite (qs), and critical compound surfaces in the torus space, t... | stability analysis of earth co-orbital objects |
evidence from iron meteorites indicates that a large number of differentiated planetesimals formed early in solar system history. these bodies should have had well-developed olivine-rich mantles and consequentially such materials ought to be abundant both as asteroids and meteorites, which they are not. to investigate ... | geochemistry and oxygen isotope composition of main-group pallasites and olivine-rich clasts in mesosiderites: implications for the "great dunite shortage" and hed-mesosiderite connection |
asteroid families form as a result of large-scale collisions among main belt asteroids. the orbital distribution of fragments after a family-forming impact could inform us about their ejection velocities. unfortunately, however, orbits dynamically evolve by a number of effects, including the yarkovsky drift, chaotic di... | constraints on the original ejection velocity fields of asteroid families |
recent spacecraft missions detected presence of hydroxyl or water over large areas on the lunar surface. several craters near the lunar poles have increased concentrations of hydrogen suggesting impact delivery of water. using a numerical model, we have carried out computer simulations of the impacts of asteroids and c... | water delivery to the moon by asteroidal and cometary impacts |
osiris-rex will return pristine samples of carbonaceous asteroid bennu. this article describes how pristine was defined based on expectations of bennu and on a realistic understanding of what is achievable with a constrained schedule and budget, and how that definition flowed to requirements and implementation. to retu... | osiris-rex contamination control strategy and implementation |
thermal stress weathering is now recognized to be an active and significant geomorphological process on airless bodies. this study aims to understand the key factors governing thermal stresses in rocks on airless bodies through extensive numerical calculations and analytic analyses. microscopic (grain-scale) thermal st... | unraveling the mechanics of thermal stress weathering: rate-effects, size-effects, and scaling laws |
it has been proposed that all l chondrites resulted from an ongoing collisional cascade of fragments that originated from the formation of the 500 ma old asteroid family gefion, located near the 5:2 mean-motion resonance with jupiter in the middle main belt. if so, l chondrite pre-atmospheric orbits should be distribut... | the creston, california, meteorite fall and the origin of l chondrites |
i report results from accurate numerical integrations of solar system orbits over the past 100 myr with the integrator package hnbody. the simulations used different integrator algorithms, step sizes, and initial conditions, and included effects from general relativity, different models of the moon, the sun's quadrupol... | numerical solutions for the orbital motion of the solar system over the past 100 myr: limits and new results |
in order to search for evidence of hydration on m-type asteroid (16) psyche, we observed this object in the 3 μm spectral region using the long-wavelength cross-dispersed (lxd: 1.9-4.2 μm) mode of the spex spectrograph/imager at the nasa infrared telescope facility. our observations show that psyche exhibits a 3 μm abs... | detection of water and/or hydroxyl on asteroid (16) psyche |
robo-ao is an autonomous laser guide star adaptive optics (ao) system recently commissioned at the kitt peak 2.1 m telescope. with the ability to observe every clear night, robo-ao at the 2.1 m telescope is the first dedicated ao observatory. this paper presents the imaging performance of the ao system in its first 18 ... | the performance of the robo-ao laser guide star adaptive optics system at the kitt peak 2.1 m telescope |
the short-lived 182hf-182w decay system is a powerful chronometer for constraining the timing of metal-silicate separation and core formation in planetesimals and planets. neutron capture effects on w isotopes, however, significantly hamper the application of this tool. in order to correct for neutron capture effects, ... | late metal-silicate separation on the iab parent asteroid: constraints from combined w and pt isotopes and thermal modelling |
the first definitely interstellar object 1i/'oumuamua (previously a/2017 u1) observed in our solar system provides the opportunity to directly study material from other star systems. can such objects be intercepted? the challenge of reaching the object within a reasonable timeframe is formidable due to its high helioce... | project lyra: sending a spacecraft to 1i/'oumuamua (former a/2017 u1), the interstellar asteroid |
1i/‘oumuamua is the first of likely many small bodies of extrasolar origin to be found in the solar system. these interstellar objects (isos) are hypothesized to have formed in extrasolar planetary systems prior to being ejected into interstellar space and subsequently arriving at the solar system. this paper discusses... | prospects for backtracing 1i/‘oumuamua and future interstellar objects |
sixty-six million years ago, an asteroid approximately 9 km in diameter hit the hydrocarbon- and sulfur-rich sedimentary rocks in what is now mexico. recent studies have shown that this impact at the yucatan peninsula heated the hydrocarbon and sulfur in these rocks, forming stratospheric soot and sulfate aerosols and ... | site of asteroid impact changed the history of life on earth: the low probability of mass extinction |
the mobile asteroid scout (mascot) is a small lander on board the hayabusa2 mission of the japan aerospace exploration agency to the asteroid 162173 ryugu. among the instruments on mascot is a fluxgate magnetometer, the mascot magnetometer (masmag). the magnetometer is a lightweight (∼280 g) and low power (∼0.5 w) tria... | the mascot magnetometer |
the dwarf planet ceres (equatorial diameter 963km) is the largest object that has remained in the main asteroid belt (russell and raymond, 2012), while most large bodies have been destroyed or removed by dynamical processes (petit et al. 2001; minton and malhotra, 2009). pre-dawn investigations (mccord and sotin, 2005;... | fc colour images of dwarf planet ceres reveal a complicated geological history |
this paper presents an approach for co-state initialization which is a critical step in solving minimum-time low-thrust trajectory optimization problems using indirect optimal control numerical methods. indirect methods used in determining the optimal space trajectories typically result in two-point boundary-value prob... | co-state initialization for the minimum-time low-thrust trajectory optimization |
observations from earth-based ground and orbiting telescopes indicate that the ceres’s exosphere has a time-varying water component. evidence of a transient atmosphere was also detected by dawn upon its arrival, inferred from the response on the gamma ray and neutron detector. that atmosphere appeared shortly after the... | the dependence of the cerean exosphere on solar energetic particle events |
throughout the history of the solar system, mars has experienced continuous asteroidal impacts. these impacts have produced impact-generated mars ejecta, and a fraction of this debris is delivered to earth as martian meteorites. another fraction of the ejecta is delivered to the moons of mars, phobos and deimos. here, ... | transport of impact ejecta from mars to its moons as a means to reveal martian history |
photometric analyses are used to standardize images obtained at a variety of illumination and viewing conditions to a common geometry for the construction of maps or mosaics and for comparison with spectral measurements acquired in the laboratory. many models exist that can be used to model photometric behavior. two of... | application of multiple photometric models to disk-resolved measurements of mercury's surface: insights into mercury's regolith characteristics |
motivated by the hypothesis that 'oumuamua could conceivably be an interstellar probe, we used the allen telescope array to search for radio transmissions that would indicate a non-natural origin for this object. observations were made at radio frequencies between 1 and 10 ghz using the array's correlator receiver with... | radio seti observations of the interstellar object ‧oumuamua |
recently, deep neural networks (dnns) have been widely and successfully used in object detection, e.g. faster rcnn, yolo, centernet. however, recent studies have shown that dnns are vulnerable to adversarial attacks. adversarial attacks against object detection can be divided into two categories, whole-pixel attacks an... | dpattack: diffused patch attacks against universal object detection |
characterizing the surface material of an asteroid is important for understanding its geology and for informing mission decisions, such as the selection of a sample site. diurnal surface temperature amplitudes are directly related to the thermal properties of the materials on the surface. we describe a numerical model ... | full-field modeling of heat transfer in asteroid regolith: radiative thermal conductivity of polydisperse particulates |
aims: we analyze the behavior of the argument of pericenter ω2 of an outer particle in the elliptical restricted three-body problem, focusing on the ω2 resonance or inverse lidov-kozai resonance.methods: first, we calculated the contribution of the terms of quadrupole, octupole, and hexadecapolar order of the secular a... | inverse lidov-kozai resonance for an outer test particle due to an eccentric perturber |
we report results from new and archival observations of the newly discovered active asteroid (248370) 2005 qn173 (also now designated comet 433p), which has been determined to be a likely main-belt comet based on a subsequent discovery that it is recurrently active near perihelion. from archival data analysis, we estim... | physical characterization of main-belt comet (248370) 2005 qn173 |
in this work, we employ a soft-sphere discrete element method with a cohesion implementation to model the dynamical process of sub-km-sized cohesive rubble piles under continuous spin-up. the dependences of the critical spin periods tc on several material parameters for oblate rubble piles with different diameters were... | critical spin periods of sub-km-sized cohesive rubble-pile asteroids: dependences on material parameters |
meteor physics can provide new clues about the size, structure, and density of cometary disintegration products, establishing a bridge between different research fields. from meteor magnitude data we have estimated the mass distribution of meteoroids from different cometary streams by using the relation between the lum... | learning about comets from the study of mass distributions and fluxes of meteoroid streams |
meteoroids impacting the earth on a daily basis are fragments of asteroids and comets. by studying fireballs produced during their disintegration in the atmosphere, we can gain information about their source regions and the properties of their parent bodies. in this work, data on 824 fireballs presented in an accompany... | data on 824 fireballs observed by the digital cameras of the european fireball network in 2017-2018. ii. analysis of orbital and physical properties of centimeter-sized meteoroids |
global geologic maps are useful tools for efficient interpretation of a planetary body, and they provide global context for the diversity and evolution of the surface. we used data acquired by the osiris-rex spacecraft to create the first global geologic map of the near-earth asteroid (101955) bennu. as this is the fir... | global geologic map of asteroid (101955) bennu indicates heterogeneous resurfacing in the past 500,000\xa0years |
we successfully observed 191 near-earth asteroids using the arecibo observatory's s-band planetary radar system from 2017 december through 2019 december. we present radar cross sections for 167 asteroids; circular-polarization ratios for 112 asteroids based on doppler-echo-power spectra measurements; and radar albedos,... | arecibo planetary radar observations of near-earth asteroids: 2017 december-2019 december |
it is speculated that some weakly active comets may be transitional objects between active and dormant comets. these objects are at a unique stage of the evolution of cometary nuclei, as they are still identifiable as active comets, in contrast to inactive comets that are observationally indistinguishable from low albe... | when comets get old: a synthesis of comet and meteor observations of the low activity comet 209p/linear |
the yinggehai and qiongdongnan basins in the northwestern south china sea preserve a large volume of cenozoic sediments. however, their sources are still remain controversial and need a further research. this paper uses discriminant diagrams and bivariate plots of major, trace and rare earth elements, combined with hea... | geochemistry and provenance of a multiple-stage fan in the upper miocene to the pliocene in the yinggehai and qiongdongnan basins, offshore south china sea |
aims: we carried out a spectroscopic survey in order to investigate the composition of 64 asteroids of the inner main belt, which are leftovers of the original planetesimals of our solar system (we call them inner main belt planetesimals or imbps). following published methods, we identified imbps in the inverse size ve... | composition of inner main-belt planetesimals |
context. landing on the surface of small bodies is particularly challenging, as the physical properties of the surface material are not well known and the mechanical response of this material in a low-gravity environment is not well understood.aims: in order to improve our understanding of low-speed impact processes on... | numerical modeling of lander interaction with a low-gravity asteroid regolith surface. application to mascot on board hayabusa2 |
the world is entering a new era of exploring and exploiting outer space. the revolution in small, low-cost satellites, the recent initiatives from some countries to establish a legal framework, the increasing demand for technology metals and advances in space additive manufacturing have renewed the interest in space mi... | in situ resource utilisation: the potential for space biomining |
the elemental and isotopic compositions of meteorites are expected to reflect several key processes that occurred in the early solar system, including the migration of gas and dust throughout the protoplanetary disk, the formation of chondrules, and the accretion of the first planetary bodies. however, the specific ori... | constraints on chondrule generation, disk dynamics, and asteroid accretion from the compositions of carbonaceous meteorites |
determining the timescales of the accretion and chemical differentiation of meteorite parent bodies provides some of the most direct constraints on the formation of planetesimals and the earliest stages of planet formation. we present high-precision hf-w isotope data for a comprehensive set of ureilites, ultramafic man... | planetesimal differentiation revealed by the hf-w systematics of ureilites |
asteroid (16) psyche is a unique, metal-rich object belonging to the "m" taxonomic class. it may be a remnant protoplanet that has been stripped of most silicates by a hit-and-run collision. because psyche offers insight into the planetary formation process, it is the target of nasa's psyche mission, set to launch in 2... | asteroid (16) psyche: evidence for a silicate regolith from spitzer space telescope spectroscopy |
about 66 million years ago, an asteroid about 10 km in diameter struck the yucatan peninsula creating the chicxulub crater. the crater has been dated and found to be coincident with the cretaceous-paleogene (k-pg) mass extinction event, one of six great mass extinctions in the last 600 million years. this event precipi... | designing global climate and atmospheric chemistry simulations for 1 and 10 km diameter asteroid impacts using the properties of ejecta from the k-pg impact |
most bodies in the solar system do not have a homogeneous structure. understanding the outcome of an impact into regolith layers of different properties is especially important for nasa's double asteroid redirection test (dart) and esa's hera missions. here we used the isale shock physics code to simulate the dart impa... | the effects of asteroid layering on ejecta mass-velocity distribution and implications for impact momentum transfer |
all-sky meteor orbit system (amos) is a semi-autonomous video observatory for detection of transient events on the sky, mostly the meteors. its hardware and software development and permanent placement on several locations in slovakia allowed the establishment of slovak video meteor network (svmn) monitoring meteor act... | all-sky meteor orbit system amos and preliminary analysis of three unusual meteor showers |
photographs of the asteroid itokawa reveal unexpectedly strong size segregation between lowlands populated almost entirely by small pebbles and highlands consisting of larger boulders. we propose that this segregation may be caused by a simple and unexplored effect: pebbles accreting onto the asteroid rebound from boul... | size sorting on the rubble-pile asteroid itokawa |
trojan asteroids are small bodies orbiting around the l4 or l5 lagrangian points of a sun-planet system. due to their peculiar orbits, they provide key constraints to the solar system evolution models. despite numerous dedicated observational efforts in the last decade, asteroid 2010 tk7 has been the only known earth t... | orbital stability analysis and photometric characterization of the second earth trojan asteroid 2020 xl5 |
the leading source of uncertainty to predict the orbital motion of asteroid (99942) apophis is a non-gravitational acceleration arising from the anisotropic thermal re-emission of absorbed radiation, known as the yarkovsky effect. previous attempts to obtain this parameter from astrometry for this object have only yiel... | non-zero yarkovsky acceleration for near-earth asteroid (99942) apophis |
when planetesimals grow via collisions in a turbulent disk, stirring through density fluctuation caused by turbulence effectively increases the relative velocities between planetesimals, which suppresses the onset of runaway growth. we investigate the onset of runaway growth in a turbulent disk through simulations that... | from planetesimals to planets in turbulent protoplanetary disks. i. onset of runaway growth |
despite the hazards of asteroids, utilization of their resources and useful materials have been raised recently. in some scenarios, capturing and controlling asteroids are essential for asteroid mining. to this end, a reliable detumbling mission using a swarm of cubesats, each equipped with a low-thrust thruster, is pr... | designing reliable detumbling mission for asteroid mining |
astronomical solutions provide insight into the solar system's dynamical evolution and are indispensable tools in cyclostratigraphy and astrochronology. constructing an absolute, fully calibrated astronomical time scale (ats) has hitherto been hindered beyond ∼50 ma because orbital calculations disagree before that age... | geologically constrained astronomical solutions for the cenozoic era |
context. it is well known that hydrogen cyanide and formamide can universally be considered as key molecules in prebiotic synthesis. despite the fact that formamide has been detected in interplanetary and interstellar environments, other prebiotic species are far more abundant, including, for example, formaldehyde. how... | prebiotic synthesis initiated in formaldehyde by laser plasma simulating high-velocity impacts |
the direction in which a planetary core solidifies has fundamental implications for the feasibility and nature of dynamo generation. although earth's core is outwardly solidifying, the cores of certain smaller planetary bodies have been proposed to inwardly solidify due to their lower central pressures. however, there ... | paleomagnetic evidence for dynamo activity driven by inward crystallisation of a metallic asteroid |
context. the available set of spin and shape modelled asteroids is strongly biased against slowly rotating targets and those with low lightcurve amplitudes. this is due to the observing selection effects. as a consequence, the current picture of asteroid spin axis distribution, rotation rates, radiometric properties, o... | photometric survey, modelling, and scaling of long-period and low-amplitude asteroids |
the microwave cathode was developed as a neutralizer for the microwave ion thrusters of the japanese asteroid explorers hayabusa and hayabusa2. since it emits hundreds of ma of electron current, ion currents collect at the wall of the cathode, which causes fatal destruction due to sputtering. in an effort to reduce the... | effect of nozzle magnetic field on microwave discharge cathode performance |
electrostatic dust levitation is the phenomenon where dust grains hover above the surface of an airless body due to the approximate balancing of the forces attracting the grain to and repelling the grain from the body. the dynamics of levitating grains have been investigated previously for the case where the grain's mo... | dynamics of 2d electrostatic dust levitation at asteroids |
we present an analysis of the blank-sky spectra observed with the faint object spectrograph on board the hubble space telescope. we study the diffuse sky emission from ultraviolet to optical wavelengths, which is composed of zodiacal light (zl), diffuse galactic light (dgl), and residual emission. the observations were... | ultraviolet to optical diffuse sky emission as seen by the hubble space telescope faint object spectrograph |
this paper presents a quantitative study of the evolution of the ejecta cloud released from a hypervelocity impact on a binary asteroid. the asteroid impact & deflection assessment (aida) mission project in collaboration between nasa and esa aims to perform an asteroid deflection demonstration, using a half-ton pro... | ejecta cloud from the aida space project kinetic impact on the secondary of a binary asteroid: ii. fates and evolutionary dependencies |
eos family was created during a catastrophic impact about 1.3 gyr ago. rotation states of individual family members contain information about the history of the whole population. we aim to increase the number of asteroid shape models and rotation states within the eos collision family, as well as to revise previously p... | spin states of asteroids in the eos collisional family |
(modified from published version) twelve years ago the catalina sky survey discovered earth's first known natural geocentric object other than the moon, a few-meter diameter asteroid designated 2006 rh120. despite significant improvements in ground-based telescope and detector technology in the past decade the asteroid... | earth's minimoons: opportunities for science and technology. |
asteroid (514107) ka`epaoka`awela is the first example of an object in the 1/1 mean motion resonance with jupiter with retrograde motion around the sun. its orbit was shown to be stable over the age of the solar system, which implies that it must have been captured from another star when the sun was still in its birth ... | periodic orbits of the retrograde coorbital problem |
in the restricted problem of three bodies when the primaries are triaxial rigid bodies, the necessary and sufficient conditions to find the locations of the three libration collinear points are stated. in addition, the linear stability of these points is studied for the case of the euler angles of rotational motion bei... | on the libration collinear points in the restricted three - body problem |
both asteroids and comets can come close to the earth's orbit. any dust released from any them will form a meteoroid stream whose orbit may allow the earth to pass through it. if this takes place, the ablation of the meteoroids in the earth's atmosphere will be observed as meteors. the various ways in which both shower... | minor meteor showers and the sporadic background |
in the framework of the circular restricted three body problem we show that the numerically computed strength sr(e, i, ω) is a good indicator of the strength and width of the mean-motion resonances in the full space (e, i, ω). we present a survey of strengths in the space (e, i) for typical interior and exterior resona... | strength, stability and three dimensional structure of mean motion resonances in the solar system |
two narrow and dense rings (called c1r and c2r) were discovered around the centaur object (10199) chariklo during a stellar occultation observed on 2013 june 3. following this discovery, we planned observations of several occultations by chariklo’s system in order to better characterize the physical properties of the r... | the structure of chariklo’s rings from stellar occultations |
we report photometry and spectroscopy of the outburst of the young stellar object eso-hα99. the outburst was first noticed in gaia alert gaia18dvc and later by the asteroid terrestrial-impact last alert system (atlas). we have established the outburst light curve with archival atlas orange filter photometry, gaia data,... | the new exor outburst of eso-hα 99 observed by gaia atlas and tess |
the lifetime of a planetary disc that orbits a white dwarf represents a crucial input parameter into evolutionary models of that system. here we apply a purely analytical formalism to estimate lifetimes of the debris phase of these discs, before they are ground down into dust or are subject to sublimation from the whit... | the lifetimes of planetary debris discs around white dwarfs |
sn 2018hti is a type i superluminous supernova (slsn i) with an absolute g-band magnitude of -22.2 at maximum brightness, discovered by the asteroid terrestrial-impact last alert system in a metal-poor galaxy at a redshift of 0.0612. we present extensive photometric and spectroscopic observations of this supernova, cov... | sn 2018hti: a nearby superluminous supernova discovered in a metal-poor galaxy |
various properties of jovian trojan asteroids such as composition, rotation periods, and photometric amplitudes, or the rate of binarity in the population, can provide information and constraints on the evolution of the group and of the solar system itself. here we present new photometric properties of 45 jovian trojan... | 101 trojans: a tale of period bimodality, binaries, and extremely slow rotators from k2 photometry |
neptunian trojans (nts), trans-neptunian objects in 1:1 mean-motion resonance with neptune, are generally thought to have been captured from the original trans-neptunian protoplanetary disc into co-orbital resonance with the ice giant during its outward migration. it is possible, therefore, that the colour distribution... | keck, gemini, and palomar 200-inch visible photometry of red and very-red neptunian trojans |
we report on the implemented design of a two-colour instrument based on electron-multiplying ccd (emccd) detectors. this instrument is currently installed at the danish 1.54 m telescope at eso's la silla observatory in chile, and will be available at the song (stellar observations network group) 1m telescope node at te... | the two-colour emccd instrument for the danish 1.54 m telescope and song |
recent dynamical analyses suggest that some jupiter family comets (jfcs) may originate in the main asteroid belt instead of the outer solar system. this possibility is particularly interesting given evidence that icy main-belt objects are known to be present in the themis asteroid family. we report results from dynamic... | potential themis-family asteroid contribution to the jupiter-family comet population |
there are only a few known main belt (mb) asteroid families with ages greater than 2 gyr (brož et al., 2013; spoto et al., 2015). estimates based on the family producing collision rate suggest that the lack of > 2 gyr-old families may be due to a selection bias in current techniques used to identify families. family... | yarkovsky v-shape identification of asteroid families |
the asteroid 4 vesta is the second most massive planetesimal in the solar system and a rare example of a planetary object that possibly can be linked to a specific group of differentiated meteorites, the howardite-eucrite-diogenite suite. the 182hf-182w chronometry of individual zircon grains from six basaltic eucrites... | prolonged magmatism on 4 vesta inferred from hf-w analyses of eucrite zircon |
ureilite meteorites are achondrites that are debris of the mantle of a now disrupted differentiated asteroid rich in carbon. they provide a unique opportunity to study the differentiation processes of such a body. we analyzed the iron isotopic compositions of 30 samples from the ureilite parent body (upb) including 29 ... | early stages of core segregation recorded by fe isotopes in an asteroidal mantle |
missions to asteroids are now an important component of the space exploration program of major space agencies in the world, with the goal of better understanding the formation of the solar system and learn about their dynamics to be able to react in case of a possible collision with the earth. as binary asteroids compo... | impact of solar radiation pressure modeling on orbital dynamics in the vicinity of binary asteroids |
context. the rotation state of small asteroids is affected by the yarkovsky-o'keefe-radzievskii-paddack (yorp) effect, which is a net torque caused by solar radiation directly reflected and thermally reemitted from the surface. due to this effect, the rotation period slowly changes, which can be most easily measured in... | rotation acceleration of asteroids (10115) 1992 sk, (1685) toro, and (1620) geographos due to the yorp effect |
the near-earth asteroid (162173) ryugu, the target of hayabusa2 space mission, was observed via both orbiter and the lander instruments. the infrared radiometer on the mascot lander (mara) is the only instrument providing spectrally resolved mid-infrared (mir) data, which is crucial for establishing a link between the ... | mid-infrared emissivity of partially dehydrated asteroid (162173) ryugu shows strong signs of aqueous alteration |
using the s-band radar at arecibo observatory, we observed thirteen x/m-class asteroids; nine were previously undetected and four were re-observed, bringing the total number of tholen x/m-class asteroids observed with radar to 29. of these 29m-class asteroids, 13 are also w-class, defined as m-class objects that also d... | a radar survey of m- and x-class asteroids. iii. insights into their composition, hydration state, & structure |
this paper describes the guidance and navigation technique used by hayabusa2 for the asteroid rendezvous operation to reach ryugu. the operation results, including the achieved guidance and navigation performance, are also summarized. multiple assessment and navigation teams worked closely to provide reliable navigatio... | rendezvous to asteroid with highly uncertain ephemeris: hayabusa2's ryugu-approach operation result |
an impact experiment was performed on the surface of the c-type asteroid (162173) ryugu using an instrument called the small carry-on impactor (sci) carried by the japan aerospace exploration agency spacecraft hayabusa2. using a small camera separated from the spacecraft, we observed the development of the ejecta curta... | impact experiment on asteroid (162173) ryugu: structure beneath the impact point revealed by in situ observations of the ejecta curtain |
the one‑step synthesis and characterization of a new and robust titanium‑based metal–organic framework, acm‑1, is reported. in this structure, which is based on infinite ti−o chains and 4,4′,4′′,4′′′‑(pyrene‑1,3,6,8‑tetrayl) tetrabenzoic acid as a photosensitizer ligand, the combination of highly mobile photogenerated ... | a titanium metal–organic framework with visible‑light‑responsive photocatalytic activity |
the very wide diversity of asteroid compositions in the main belt suggests significant material transport in the solar protoplanetary disk and hints at the presence of interstellar ices in hydrated bodies. however, only a few quantitative estimations of the contribution of interstellar ice in the inner solar system hav... | inward radial mixing of interstellar water ices in the solar protoplanetary disk |
we explore experimentally possible explanations of the polarization curves of the sunlight reflected by the barbarian asteroids. their peculiar polarization curves are characterized by a large-inversion angle, around 30°, which could be related to the presence of feo-bearing spinel embedded in calcium-aluminum inclusio... | experimental phase function and degree of linear polarization curve of olivine and spinel and the origin of the barbarian polarization behaviour |
the terrestrial planets endured a phase of bombardment following their accretion, but the nature of this late accreted material is debated, preventing a full understanding of the origin of inner solar system volatiles. we report the discovery of nucleosynthetic chromium isotope variability (μ 54 cr) in martian meteorit... | late delivery of exotic chromium to the crust of mars by water-rich carbonaceous asteroids |
the mars-moon exploration with gamma rays and neutrons (megane) investigation will use gamma-ray and neutron spectroscopy to measure the elemental composition of mars' moon phobos. megane is part of the japanese martian moons exploration (mmx) mission that will make comprehensive remote sensing measurements of both of ... | measuring the elemental composition of phobos: the mars-moon exploration with gamma rays and neutrons (megane) investigation for the martian moons exploration (mmx) mission |
a significant fraction of white dwarfs (wds) exhibit signs of ongoing accretion of refractory elements at rates ~103-107 kg s-1, among which, 37 wds were detected to harbor dusty debris disks. such a concurrence requires not only fertile reservoirs of planetary material but also a high duty cycle of metal delivery. it ... | orbital migration and circularization of tidal debris by alfvén-wave drag: circumstellar debris and pollution around white dwarfs |
variations in the abundances of moderately volatile elements (mve) are one of the most fundamental geochemical differences between the terrestrial planets. whether these variations are the consequence of nebular processes, planetary volatilization, differentiation or late accretion is still unresolved. the element merc... | chondritic mercury isotopic composition of earth and evidence for evaporative equilibrium degassing during the formation of eucrites |
in early 2019, the osiris-rex spacecraft discovered small particles being ejected from the surface of the near-earth asteroid bennu.sww although they were seen to be ejected at slow speeds, on the order of tens of cm/s, a number of particles were surprisingly seen to orbit for multiple revolutions and days, which requi... | dynamical evolution of simulated particles ejected from asteroid bennu |
influences of morphology on the optical properties of soot particles have gained increasing attentions. however, studies on the effect of the way primary particles are coated on the optical properties is few. aimed to understand how the primary particles are coated affect the optical properties of soot particles, the c... | a model study of aggregates composed of spherical soot monomers with an acentric carbon shell |
context. asteroid (16) psyche is the largest m-type asteroid in the main belt and the target of the nasa psyche mission. it is also the only asteroid of this size (d > 200 km) known to be metal rich. although various hypotheses have been proposed to explain the rather unique physical properties of this asteroid, a p... | asteroid (16) psyche's primordial shape: a possible jacobi ellipsoid |
nitrogen-doped porous activated carbon monoliths (ndp-acms) have long been the most desirable materials for supercapacitors. unique to the conventional template based lewis acid/base activation methods, herein, we report on a simple yet practicable novel approach to production of the three-dimensional ndp-acms (3d-ndp-... | nitrogen-doped porous carbon monoliths from polyacrylonitrile (pan) and carbon nanotubes as electrodes for supercapacitors |
a recent report by nasa identified dust/particulate mitigation techniques as a highly relevant study for future long-term planetary exploration missions (nasa, 2015). the deleterious effects of lunar dust on spacesuits discovered during the apollo missions has compelled nasa to identify dust mitigation as a critical pa... | proof of concept demonstration of novel technologies for lunar spacesuit dust mitigation |
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