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we propose that several short-duration events observed in past stellar occultations by chiron were produced by ring material. some similarities between these events and the characteristics of chariklo's rings could indicate common mechanisms around centaurs. from a reanalysis of the stellar occultation data in the lite... | possible ring material around centaur (2060) chiron |
the recently discovered minor body 1i/2017 u1 (‘oumuamua) is the first known object in our solar system that is not bound by the sun’s gravity. its hyperbolic orbit (eccentricity greater than unity) strongly suggests that it originated outside our solar system; its red color is consistent with substantial space weather... | implications for planetary system formation from interstellar object 1i/2017 u1 (‘oumuamua) |
we present follow-up photometry and spectroscopy of ztf j0328-1219, strengthening its status as a white dwarf exhibiting transiting planetary debris. using tess and zwicky transient facility photometry, along with follow-up high-speed photometry from various observatories, we find evidence for two significant periods o... | recurring planetary debris transits and circumstellar gas around white dwarf ztf j0328-1219 |
the surface mineralogy of dwarf planet ceres appears to be dominated by products of rock-fluid interactions, such as phyllosilicates—some of which are nh4-bearing—and carbonates1-3. elemental concentrations derived from the inferred mineral mixing fractions, however, do not match measurements of h, c, k and fe on ceres... | an aqueously altered carbon-rich ceres |
we present a new analysis of the diffuse soft γ -ray emission toward the inner galaxy as measured by the spectrometer aboard the integral satellite (spi) with 16 years of data taking. the analysis implements a spatial template fit of spi data and an improved instrumental background model. we characterize the contributi... | strong constraints on primordial black hole dark matter from 16 years of integral/spi observations |
the qinghai lake basin (qlb) is an ideal region to explore the interaction between climate change, vegetation evolution, and anthropogenic activities during the holocene epoch. this is due to the basin's particular sensitivity to global climate changes along with its densely distributed archeological sites, present sin... | climate change and anthropogenic activities in qinghai lake basin over the last 8500 years derived from pollen and charcoal records in an aeolian section |
the cm carbonaceous chondrite meteorites provide a record of low temperature (<150 °c) aqueous reactions in the early solar system. a number of cm chondrites also experienced short-lived, post-hydration thermal metamorphism at temperatures of ∼200 °c to >750 °c. the exact conditions of thermal metamorphism and th... | thermal alteration of cm carbonaceous chondrites: mineralogical changes and metamorphic temperatures |
we use a dynamical model to characterize the monthly and yearly variations of the lunar meteoroid environment for meteoroids originating from short and long-period comets and the main-belt asteroids. our results show that if we assume the meteoroid mass flux of 43.3 tons per day at earth, inferred from previous works, ... | meteoroids at the moon: orbital properties, surface vaporization, and impact ejecta production |
samples from asteroid ryugu returned by the hayabusa2 mission contain evidence of extensive alteration by aqueous fluids and appear related to the ci chondrites. to understand the sources of the fluid and the timing of chemical reactions occurring during the alteration processes, we investigated the oxygen, carbon and ... | early fluid activity on ryugu inferred by isotopic analyses of carbonates and magnetite |
we report high-resolution spectroscopic observations of wd 1145+017—a white dwarf that was recently found to be transitted by multiple asteroid-sized objects within its tidal radius. we discovered numerous circumstellar absorption lines with linewidths of ∼300 km s-1 from mg, ca, ti, cr, mn, fe, and ni, possibly from s... | evidence for gas from a disintegrating extrasolar asteroid |
the jaxa hayabusa-2 mission was approved in 2010 and launched on december 3, 2014. the spacecraft will arrive at the near-earth asteroid 162173 ryugu (1999 ju3) in 2018 where it will perform a survey, land and obtainsurface material, then depart in december 2019 and return to earth in december 2020. we observed ryugu w... | hayabusa-2 mission target asteroid 162173 ryugu (1999 ju3): searching for the object's spin-axis orientation |
we present the results of a monte carlo technique to calculate the absolute magnitudes (h) and slope parameters (g) of ∼240,000 asteroids observed by the pan-starrs1 telescope during the first 15 months of its 3-year all-sky survey mission. the system's exquisite photometry with photometric errors ≲ 0.04mag , and well-... | absolute magnitudes and slope parameters for 250,000 asteroids observed by pan-starrs ps1 - preliminary results |
the low velocity of interstellar asteroid 1i/'oumuamua with respect to our galaxy's local standard of rest implies that it is young. adopting the young age hypothesis, we assess possible origin systems for this interstellar asteroid and for 2i/borisov, though the latter's higher speed means it is unlikely to be young. ... | the dynamics of interstellar asteroids and comets within the galaxy: an assessment of local candidate source regions for 1i/'oumuamua and 2i/borisov |
the collision of the nasa dart spacecraft with asteroid dimorphos resulted in the formation of a distinctive and long-lived debris trail, formed by the action of solar radiation pressure on ejected particles. this trail briefly displayed a double appearance, which has been interpreted as the result of a double ejection... | a single ejection model of the dart/dimorphos debris trail |
the cm chondrites are samples of primitive water-rich asteroids formed during the early solar system. they record significant interaction between liquid water and silicate rock, resulting in a mineralogy dominated by hydrated secondary phases. their similarity to the near-earth asteroids bennu and ryugu - targets of cu... | the aqueous alteration of cm chondrites, a review |
this paper proposes a new nonlinear guidance algorithm applicable for asteroid both hovering and landing. with the new guidance, a spacecraft achieves its target position and velocity in finite-time without the requirement of reference trajectories. the global stability is proven for the controlled system. a parametric... | finite-time control for asteroid hovering and landing via terminal sliding-mode guidance |
the exoplanetary system of hr 8799 is one of the rare systems in which multiple planets have been directly imaged. its architecture is strikingly similar to that of the solar system, with the four imaged giant planets surrounding a warm dust belt analogous to the asteroid belt, and themselves being surrounded by a cold... | a detailed characterization of hr 8799's debris disk with alma in band 7 |
extraterrestrial iron sulfide is a major mineral reservoir of the cosmochemically and astrobiologically important elements iron and sulfur. sulfur depletion on asteroids is a long-standing, yet unresolved phenomenon that is of fundamental importance for asteroid evolution and sulfur delivery to the earth. understanding... | iron whiskers on asteroid itokawa indicate sulfide destruction by space weathering |
some years ago, the consensus was that asteroid (16) psyche was almost entirely metal. new data on density, radar properties, and spectral signatures indicate that the asteroid is something perhaps even more enigmatic: a mixed metal and silicate world. here we combine observations of psyche with data from meteorites an... | observations, meteorites, and models: a preflight assessment of the composition and formation of (16) psyche |
context. asteroid (101955) bennu is the target of nasa's origins, spectral interpretation, resource identification, and security-regolith explorer (osiris-rex) mission. the spacecraft's instruments have characterized bennu at global and local scales to select a sampling site and provide context for the sample that will... | evidence for limited compositional and particle size variation on asteroid (101955) bennu from thermal infrared spectroscopy |
stereophotoclinometry (spc) is a technique to extract topographic information from images acquired by spacecraft. it combines stereophotogrammetry and photoclinometry to produce a product that has the accuracy of stereo with the resolution of photoclinometry without the restrictions common to both. we describe the impl... | practical stereophotoclinometry for modeling shape and topography on planetary missions |
prompt learning is a new paradigm in the natural language processing (nlp) field which has shown impressive performance on a number of natural language tasks with common benchmarking text datasets in full, few-shot, and zero-shot train-evaluation setups. recently, it has even been observed that large but frozen pre-tra... | clinical prompt learning with frozen language models |
large metal stable isotopic variations have been observed in both extraterrestrial and terrestrial samples. for example, ca exhibits large mass-dependent isotopic variation in terrestrial igneous rocks and mantle minerals (on the order of ∼2‰ variation in 44ca/40ca). a thorough assessment and understanding of such isot... | coupled extremely light ca and fe isotopes in peridotites |
we study possibilities to explain the whole dark matter abundance by primordial black holes (pbhs) or to explain the merger rate of binary black holes estimated from the gravitational wave detections by ligo/virgo. we assume that the pbhs are originated in a radiation- or matter-dominated era from large primordial curv... | primordial black hole dark matter and ligo/virgo merger rate from inflation with running spectral indices: formation in the matter- and/or radiation-dominated universe |
knowledge of water in the solar system is important for the understanding of a wide range of evolutionary processes and the thermal history of the solar system. to explore the existence of water in the solar system, it is indispensable to investigate hydrated minerals and/or water ice on asteroids. these water-related ... | akari/irc near-infrared asteroid spectroscopic survey: acua-spec |
we are performing a wide and deep survey for extreme distant solar system objects. our goal is to understand the high-perihelion objects sedna and 2012 vp113 and determine if an unknown massive planet exists in the outer solar system. the discovery of new extreme objects from our survey of some 1080 square degrees of s... | new extreme trans-neptunian objects: toward a super-earth in the outer solar system |
we know that planetary systems are just as common around white dwarfs as around main-sequence stars. however, self-consistently linking a planetary system across these two phases of stellar evolution through the violent giant branch poses computational challenges, and previous studies restricted architectures to equal-... | full-lifetime simulations of multiple unequal-mass planets across all phases of stellar evolution |
context. the populations of small bodies of the solar system (asteroids, comets, kuiper-belt objects) are used to constrain the origin and evolution of the solar system. both their orbital distribution and composition distribution are required to track the dynamical pathway from their regions of formation to their curr... | a million asteroid observations in the sloan digital sky survey |
context. the gaia mission of the european space agency (esa) has been routinely observing solar system objects (ssos) since the beginning of its operations in august 2014. the gaia data release three (dr3) includes, for the first time, the mean reflectance spectra of a selected sample of 60 518 ssos, primarily asteroid... | gaia data release 3. reflectance spectra of solar system small bodies |
abstract the timing and mechanisms of the climatic and environmental perturbations induced by the emplacement of the deccan traps large igneous province (india) and their contribution to the cretaceous-paleogene (k-pg) mass extinction are still debated. in many marine sediment archives, mercury (hg) enrichments straddl... | volcanic origin of the mercury anomalies at the cretaceous-paleogene transition of bidart, france |
phobos and deimos, the two small satellites of mars, are thought either to be asteroids captured by the planet or to have formed in a disc of debris surrounding mars following a giant impact. both scenarios, however, have been unable to account for the current mars system. here we use numerical simulations to suggest t... | accretion of phobos and deimos in an extended debris disc stirred by transient moons |
the utilization of natural resources from asteroids is an idea that is older than the space age. the technologies are now available to transform this endeavor from an idea into reality. the asteroid redirect mission (arm) is a mission concept which includes the goal of robotically returning a small near-earth asteroid ... | asteroid redirect mission concept: a bold approach for utilizing space resources |
two events share the stage as main drivers of the cretaceous-paleogene mass extinction—deccan traps volcanism, and an asteroid impact recorded by the chicxulub crater. we contribute to refining knowledge of the volcanic stressor by providing sulfur and fluorine budgets of deccan lavas from the western ghats (india), wh... | recurring volcanic winters during the latest cretaceous: sulfur and fluorine budgets of deccan traps lavas |
the mineralogy and geochemistry of ceres, as constrained by dawn's instruments, are broadly consistent with a carbonaceous chondrite (cm/ci) bulk composition. differences explainable by ceres's more advanced alteration include the formation of mg-rich serpentine and ammoniated clay; a greater proportion of carbonate an... | carbonaceous chondrites as analogs for the composition and alteration of ceres |
white dwarfs are routinely observed to have polluted atmospheres, and sometimes significant infrared excesses, that indicate ongoing accretion of circumstellar dust and rocky debris. typically this debris is assumed to be in the form of a (circular) disc, and to originate from asteroids that passed close enough to the ... | emission from elliptical streams of dusty debris around white dwarfs |
we have discovered two epochs of activity on quasi-hilda 2009 dq118. small bodies that display comet-like activity, such as active asteroids and active quasi-hildas, are important for understanding the distribution of water and other volatiles throughout the solar system. through our nasa partner citizen science projec... | recurring activity discovered on quasi-hilda 2009 dq118 |
we performed a statistical analysis of the astrometric errors for the major asteroid surveys. we analyzed the astrometric residuals as a function of observation epoch, observed brightness and rate of motion, finding that astrometric errors are larger for faint observations and some stations improved their astrometric q... | statistical analysis of astrometric errors for the most productive asteroid surveys |
when plate tectonics began on the earth has been long debated and here we argue this topic based on the records of earth-moon geology and asteroid belt to conclude that the onset of plate tectonics was during the middle hadean (4.37-4.20 ga). the trigger of the initiation of plate tectonics is the abel bombardment, whi... | initiation of plate tectonics in the hadean: eclogitization triggered by the abel bombardment |
blockchain technology (bct) has emerged in the last decade and added a lot of interest in the healthcare sector. the purpose of this systematic literature review (slr) is to explore the potential paradigm shift in healthcare utilizing bct. the study is compiled by reviewing research articles published in nine well-repu... | blockchain technology in healthcare: a systematic review |
we present atacama large millimeter/submillimeter array (alma) observations of the dust continuum emission at 1.3 mm and 12co j=2\to 1 line emission of the transitional disk around dm tau. dm tau’s disk is thought to possess a dust-free inner cavity inside a few au, from the absence of near-infrared excess on its spect... | a spatially resolved au-scale inner disk around dm tau |
mass-independent isotopic anomalies of carbonaceous and noncarbonaceous meteorites show a clear dichotomy suggesting an efficient separation of the inner and outer solar system. observations show that ring-like structures in the distribution of millimeter-sized pebbles in protoplanetary disks are common. these structur... | the effect of a strong pressure bump in the sun's natal disk: terrestrial planet formation via planetesimal accretion rather than pebble accretion |
inner oort cloud objects (iocs) are trans-plutonian for their entire orbits. they are beyond the strong gravitational influences of the known planets, yet close enough to the sun that outside forces are minimal. here we report the discovery of the third known ioc after sedna and 2012 vp113, called 2015 tg387. this obje... | a new high perihelion trans-plutonian inner oort cloud object: 2015 tg387 |
expected to be of the highest survey power telescope in the northern hemisphere, the wide field survey telescope (wfst) will begin its routine observations of the northern sky since 2023. wfst will produce a lot of scientific data to support the researches of time-domain astronomy, asteroids and the solar system, galax... | limiting magnitudes of the wide field survey telescope (wfst) |
graph product structure theory expresses certain graphs as subgraphs of the strong product of much simpler graphs. in particular, an elegant formulation for the corresponding structural theorems involves the strong product of a path and of a bounded treewidth graph, and allows to lift combinatorial results for bounded ... | graph product structure for h-framed graphs |
rocky asteroids and planets display nucleosynthetic isotope variations that are attributed to the heterogeneous distribution of stardust from different stellar sources in the solar protoplanetary disk. here we report new high-precision palladium isotope data for six iron meteorite groups. the palladium data display sma... | the origin of s-process isotope heterogeneity in the solar protoplanetary disk |
earth is continually impacted by very small asteroids and debris, and a larger object, though uncommon, could produce a severe natural hazard. during impact crater formation the ballistic ejection of material out of the crater is a major process, which holds significance for an impact study into the deflection of aster... | the role of asteroid strength, porosity and internal friction in impact momentum transfer |
planetesimals—the initial stage of the planetary formation process—are considered to be initially very porous aggregates of dusts1,2, and subsequent thermal and compaction processes reduce their porosity3. the hayabusa2 spacecraft found that boulders on the surface of asteroid (162173) ryugu have an average porosity of... | anomalously porous boulders on (162173) ryugu as primordial materials from its parent body |
we consider the long-term collisional and dynamical evolution of solid material orbiting in a narrow annulus near the roche limit of a white dwarf. with orbital velocities of 300 {km} {{{s}}}-1, systems of solids with initial eccentricity e≳ {10}-3 generate a collisional cascade where objects with radii r ≲ 100{--}300 ... | numerical simulations of collisional cascades at the roche limits of white dwarf stars |
primordial black holes (pbhs) in the asteroid-mass range $(10^{-17}$--$10^{-12})~m_{\odot}$ almost entirely escape constraints as dark matter candidates. in the early universe, however, the schwarzschild metric is no longer applicable and we must carefully consider pbh metrics with a proper cosmological embedding. in p... | navigating the asteroid field: new evaporation constraints for primordial black holes as dark matter |
the examination of the physical properties of chondrules has generally received less emphasis than other properties of meteorites such as their mineralogy, petrology, and chemical and isotopic compositions. among the various physical properties of chondrules, chondrule size is especially important for the classificatio... | chondrule size and related physical properties: a compilation and evaluation of current data across all meteorite groups |
owing to the ever-present solar wind, our vast solar system is full of plasmas. the turbulent solar wind, together with sporadic solar eruptions, introduces various space plasma processes and phenomena in the solar atmosphere all the way to the earth's ionosphere and atmosphere and outward to interact with the interste... | space plasma physics: a review |
the double asteroid redirection test (dart) spacecraft will impact into the asteroid dimorphos on 2022 september 26 as a test of the kinetic impactor technique for planetary defense. the efficiency of the deflection following a kinetic impactor can be represented using the momentum enhancement factor, β, which is depen... | effects of impact and target parameters on the results of a kinetic impactor: predictions for the double asteroid redirection test (dart) mission |
we report a systematic oxygen isotopic survey of ca-carbonates in nine different cm chondrites characterized by different degrees of alteration, from the least altered known to date (paris, 2.7-2.8) to the most altered (alh 88045, cm1). our data define a continuous trend that crosses the terrestrial fractionation line ... | oxygen isotope constraints on the alteration temperatures of cm chondrites |
we present the results of the first-ever visible spectroscopic survey fully dedicated to the small (absolute magnitude h ≥ 20) near-earth asteroid (nea) population. observations have been performed at the new technology telescope (ntt) of the european southern observatory (eso), during a 30-night guaranteed time observ... | a spectroscopic survey of the small near-earth asteroid population: peculiar taxonomic distribution and phase reddening |
chondrule-like objects and ca-al-rich inclusions (cais) are discovered in the retuned samples from asteroid ryugu. here we report results of oxygen isotope, mineralogical, and compositional analysis of the chondrule-like objects and cais. three chondrule-like objects dominated by mg-rich olivine are 16o-rich and -poor ... | chondrule-like objects and ca-al-rich inclusions in ryugu may potentially be the oldest solar system materials |
initial analyses showed that asteroid ryugu's composition is close to ci (ivuna-like) carbonaceous chondrites (ccs) - the chemically most primitive meteorites, characterized by near-solar abundances for most elements. however, some isotopic signatures (for example, ti, cr) overlap with other cc groups, so the details o... | contribution of ryugu-like material to earth's volatile inventory by cu and zn isotopic analysis |
the origins, spectral interpretation, resource identification, and security-regolith explorer (osiris-rex) spacecraft arrived at its target, near-earth asteroid (101955) bennu, in december 2018. observations by the onboard instruments revealed an asteroid substantially different from pre-encounter expectations, includi... | chapter 8 - osiris-rex at bennu: overcoming challenges to collect a sample of the early solar system |
we present a new `supercalibration' technique for measuring systematic distortions in the wavelength scales of high-resolution spectrographs. by comparing spectra of `solar twin' stars or asteroids with a reference laboratory solar spectrum, distortions in the standard thorium-argon calibration can be tracked with ∼10 ... | impact of instrumental systematic errors on fine-structure constant measurements with quasar spectra |
the origin and abundance of water accreted by carbonaceous asteroids remains underconstrained, but would provide important information on the dynamic of the protoplanetary disk. here we report the in situ oxygen isotopic compositions of aqueously formed fayalite grains in the kaba and mokoia cv chondrites. cv chondrite... | origin and abundance of water in carbonaceous asteroids |
1i/‘oumuamua is the first known interstellar small body, probably being only about 100 m in size. against expectations based on comets, ‘oumuamua does not show any activity and has a very elongated figure, and it also exhibits undamped rotational tumbling. in contrast, ‘oumuamua’s trajectory indicates that it was movin... | 1i/‘oumuamua as a tidal disruption fragment from a binary star system |
using the most recent prototypes, design, and as-built system information, we test and quantify the capability of the large synoptic survey telescope (lsst) to discover potentially hazardous asteroids (phas) and near-earth objects (neos). we empirically estimate an expected upper limit to the false detection rate in ls... | the large synoptic survey telescope as a near-earth object discovery machine |
the younger dryas (yd) impact hypothesis posits that fragments of a large, disintegrating asteroid/comet struck north america, south america, europe, and western asia 12,800 years ago. multiple airbursts/impacts produced the yd boundary layer (ydb), depositing peak concentrations of platinum, high-temperature spherules... | sedimentary record from patagonia, southern chile supports cosmic-impact triggering of biomass burning, climate change, and megafaunal extinctions at 12.8 ka |
meteorites originating from primitive c-type asteroids are composed of materials from the sun's protoplanetary disk, including up to a few per cent organic carbon. in contrast, some interplanetary dust particles and micrometeorites have much higher carbon contents, up to >90%, and are thought to originate from icy o... | a cometary building block in a primitive asteroidal meteorite |
in the past few decades, observations have revealed signatures of metals polluting the atmospheres of white dwarfs. the diffusion time-scale for metals to sink from the atmosphere of a white dwarf is of the order of days for a hydrogen-dominated atmosphere. thus, there must be a continuous supply of metal-rich material... | white dwarf pollution by asteroids from secular resonances |
we report new high-precision stable k isotope data for three martian meteorites, one lunar meteorite, one ordinary chondrite, four terrestrial igneous united states geological survey (usgs) reference materials, and twenty howardite-eucrite-diogenite [hed] meteorites. the three martian meteorites define a relatively nar... | potassium isotopic compositions of howardite-eucrite-diogenite meteorites |
in early 2019, nasa's osiris-rex (origins, spectral interpretation, resource identification, and security-regolith explorer) mission surveyed asteroid (101955) bennu with a collection of instruments, including the osiris-rex camera suite (ocams) polycam imager. using polycam panchromatic images, we constructed a global... | a high-resolution global basemap of (101955) bennu |
we present a global spectrophotometric characterization of the ceres surface using dawn framing camera (fc) images. we identify the photometric model that yields the best results for photometrically correcting images. corrected fc images acquired on approach to ceres were assembled into global maps of albedo and color.... | resolved spectrophotometric properties of the ceres surface from dawn framing camera images |
this book deals with an effect in celestial mechanics that has become quite important in exoplanet research. the lidov-kozai effect reveals itself in coherent periodic variations (which can be very large) of the inclination and eccentricity of an orbiting body in the presence of an inclined perturber. the effect is kno... | the lidov-kozai effect - applications in exoplanet research and dynamical astronomy |
ryugu is a carbonaceous rubble-pile asteroid visited by the hayabusa2 spacecraft. small rubble pile asteroids record the thermal evolution of their much larger parent bodies. however, recent space weathering and/or solar heating create ambiguities between the uppermost layer observable by remote-sensing and the pristin... | spectrally blue hydrated parent body of asteroid (162173) ryugu |
we give a nearly linear-time algorithm to approximately sample satisfying assignments in the random $k$-sat model when the density of the formula scales exponentially with $k$. the best previously known sampling algorithm for the random $k$-sat model applies when the density $\alpha=m/n$ of the formula is less than $2^... | fast sampling of satisfying assignments from random $k$-sat |
sixty-six million years ago, the end-cretaceous mass extinction ended the reign of the dinosaurs. flood basalt eruptions and an asteroid impact are widely discussed causes, yet their contributions remain debated. modeling the environmental changes after the chicxulub impact can shed light on this question. existing stu... | baby, it's cold outside: climate model simulations of the effects of the asteroid impact at the end of the cretaceous |
to better understand earth's present tectonic style-plate tectonics-and how it may have evolved from single plate (stagnant lid) tectonics, it is instructive to consider how common it is among similar bodies in the solar system. plate tectonics is a style of convection for an active planetoid where lid fragment (plate)... | stagnant lid tectonics: perspectives from silicate planets, dwarf planets, large moons, and large asteroids |
the cameras for allsky meteor surveillance (cams) video-based meteoroid orbit survey adds 60 newly identified showers to the iau working list of meteor showers (numbers 427, 445-446, 506-507, and part of 643-750). 28 of these are also detected in the independent sonotaco survey. in total, 230 meteor showers and shower ... | cams newly detected meteor showers and the sporadic background |
we review the evidence for buried ice in the asteroid belt; specifically the questions around the so-called main belt comets (mbcs). we summarise the evidence for water throughout the solar system, and describe the various methods for detecting it, including remote sensing from ultraviolet to radio wavelengths. we revi... | the main belt comets and ice in the solar system |
meteorites have long been considered as reflections of the compositional diversity of main belt asteroids and consequently they have been used to decipher their origin, formation, and evolution. however, while some meteorites are known to sample the surfaces of metallic, rocky and hydrated asteroids (about one-third of... | interplanetary dust particles as samples of icy asteroids |
conditions for regolith landslides to occur on spinning, gravitating spheroidal asteroids and their aftermath are studied. these conditions are developed by application of classical granular mechanics stability analysis to the asteroid environment. as part of our study we determine how slopes evolve across the surface ... | landslides and mass shedding on spinning spheroidal asteroids |
understanding the nature and origin of the precursor material to terrestrial planets is key to deciphering the mechanisms and timescales of planet formation1. nucleosynthetic variability among rocky solar system bodies can trace the composition of planetary building blocks2-5. here we report the nucleosynthetic composi... | silicon isotope constraints on terrestrial planet accretion |
ejecta from dimorphos following the dart mission impact significantly increased the brightness of the didymos-dimorphos system, allowing us to examine subsurface material. we report daily near-ir spectroscopic observations of the didymos system using nasa's irtf that follow the evolution of the spectral signature of th... | near-ir spectral observations of the didymos system: daily evolution before and after the dart impact indicates that dimorphos originated from didymos |
we performed photometric observations of the binary near-earth asteroid (65803) didymos in support of the double asteroid redirection test (dart) mission that will test the kinetic impactor technology for diverting dangerous asteroids. it will hit the didymos secondary, called dimorphos, on 2022 september 26. we observ... | photometric observations of the binary near-earth asteroid (65803) didymos in 2015-2021 prior to dart impact |
main-belt comets are small solar system bodies located in the asteroid belt that repeatedly exhibit comet-like activity (that is, dust comae or tails) during their perihelion passages, strongly indicating ice sublimation1,2. although the existence of main-belt comets implies the presence of extant water ice in the aste... | spectroscopic identification of water emission from a main-belt comet |
the nasa's double-asteroid redirection test (dart) was a unique planetary defence and technology test mission, the first of its kind. the main spacecraft of the dart mission impacted the target asteroid dimorphos, a small moon orbiting the asteroid didymos (65803), on 2022 september 26. the impact brought up a mass of ... | optical monitoring of the didymos-dimorphos asteroid system with the danish telescope around the dart mission impact |
we collected data on rotations and elongations of 46 secondaries of binary and triple systems among near-earth, mars-crossing and small main belt asteroids. 24 were found or are strongly suspected to be synchronous (in 1:1 spin-orbit resonance), and the other 22, generally on more distant and/or eccentric orbits, were ... | binary asteroid population. 3. secondary rotations and elongations |
one of the most promising techniques to capture large debris on orbit consists in the use of tether-nets. with this concept currently at a medium technological readiness level only, numerical studies on tether-net removal missions are still needed. this paper presents a versatile simulator developed with the aim of gai... | simulation of tether-nets for capture of space debris and small asteroids |
the primordial black hole (pbh) productions from the inflationary potential with an inflection point usually rely heavily on the fine-tuning of the model parameters. we propose in this work a new kind of the α-attractor inflation with asymmetric double poles that naturally and easily lead to a period of non-attractor i... | primordial black holes and induced gravitational waves from double-pole inflation |
we investigate the quantum annealing of the ferromagnetic p -spin model in a dissipative environment (p =5 and p =7 ). this model, in the large-p limit, codifies grover's algorithm for searching in an unsorted database [l. k. grover, proceedings of the 28th annual acm symposium on theory of computing (acm, new york, 19... | dissipative environment may improve the quantum annealing performances of the ferromagnetic p -spin model |
we report arecibo s-band (2380 mhz; 12.6 cm) radar observations of near-earth asteroid (3200) phaethon during the december 2017 apparition when phaethon passed within 0.07 au of earth. radar images with a resolution of 75 m per pixel reveal a roughly spheroidal shape more than 6 km in diameter at the equator with sever... | arecibo radar observations of near-earth asteroid (3200) phaethon during the 2017 apparition |
context. disk-integrated photometric data of asteroids do not contain accurate information on shape details or size scale. additional data such as disk-resolved images or stellar occultation measurements further constrain asteroid shapes and allow size estimates.aims: we aim to use all the available disk-resolved image... | volumes and bulk densities of forty asteroids from adam shape modeling |
a working timeline for the history of ordinary chondrites includes chondrule formation as early as 0-2 ma after our solar system's earliest forming solids (cais), followed by rapid accretion into undifferentiated planetesimals that were heated internally by 26al decay and cooled over a period of tens of millions of yea... | the accretion and impact history of the ordinary chondrite parent bodies |
interplanetary dust particles and meteoroids mostly originate from comets and asteroids. understanding their distribution in the solar system, their dynamical behavior and their properties, sheds light on the current state and the dynamical behavior of the solar system. dust particles can endanger earth-orbiting satell... | interplanetary dust, meteoroids, meteors and meteorites |
the trans-neptunian objects (tnos) preserve evidence of planet building processes in their orbital and size distributions. while all populations show steep size distributions for large objects, a relative deficit of neptunian trojans and scattering objects with diameters of d < 100 km has been detected. we investiga... | a carefully characterized and tracked trans-neptunian survey: the size distribution of the plutinos and the number of neptunian trojans |
the optical navigation cameras (onc-t, onc-w1, onc-w2) onboard hayabusa2 are also being used for scientific observations of the mission target, c-complex asteroid 162173 ryugu. science observations and analyses require rigorous instrument calibrations. in order to meet this requirement, we have conducted extensive infl... | updated inflight calibration of hayabusa2's optical navigation camera (onc) for scientific observations during the cruise phase |
chondrites consist of three major components: refractory inclusions (ca,al-rich inclusions [cais] and amoeboid olivine aggregates), chondrules, and matrix. here, i summarize recent results on the mineralogy, petrology, oxygen, and aluminum-magnesium isotope systematics of the chondritic components (mainly cais in carbo... | refractory inclusions in carbonaceous chondrites: records of early solar system processes |
we report on the petrology, magnesium isotopes and mass-independent 54cr/52cr compositions (μ54cr) of 42 chondrules from cv (vigarano and nwa 3118) and cr (nwa 6043, nwa 801 and lap 02342) chondrites. all sampled chondrules are classified as type ia or type iab, have low 27al/24mg ratios (0.04-0.27) and display little ... | magnesium and 54cr isotope compositions of carbonaceous chondrite chondrules - insights into early disk processes |
the colours of the outer solar system origins survey is acquiring near-simultaneous g, r, and j photometry of unprecedented precision with the gemini north telescope, targeting nearly 100 trans-neptunian objects (tnos) brighter than mr= 23.6 mag discovered in the outer solar system origins survey. combining the optical... | col-ossos: the colors of the outer solar system origins survey |
surface shedding of an asteroid is a failure mode where surface materials fly off due to strong centrifugal forces beyond the critical spin period, while the internal structure does not deform significantly. this paper proposes a possible structure of an asteroid interior that leads to surface shedding due to rapid rot... | internal structure of asteroids having surface shedding due to rotational instability |
we present a detailed study of the metal-polluted db white dwarf sdss j0845+2257 (ton 345). using high-resolution hubble space telescope/cosmic origins spectrograph and very large telescope spectroscopy, we have detected hydrogen and 11 metals in the atmosphere of the white dwarf. the origin of these metals is almost c... | the composition of a disrupted extrasolar planetesimal at sdss j0845+2257 (ton 345) |
post-main-sequence planetary science has been galvanized by the striking variability, depth and shape of the photometric transit curves due to objects orbiting white dwarf wd 1145+017, a star which also hosts a dusty debris disc and circumstellar gas, and displays strong metal atmospheric pollution. however, the physic... | explaining the variability of wd 1145+017 with simulations of asteroid tidal disruption |
near-earth asteroid population models predict the existence of bodies located inside the orbit of venus. despite searches up to the end of 2019, none had been found. we report discovery and follow-up observations of (594913) 'ayló'chaxnim, an asteroid with an orbit entirely interior to venus. (594913) 'ayló'chaxnim has... | the discovery and characterization of (594913) 'ayló'chaxnim, a kilometre sized asteroid inside the orbit of venus |
unlike the other terrestrial planets, earth has a substantial silica-rich continental crust with a bulk andesitic composition. a small number of meteorites with andesitic bulk compositions have been identified that are thought to be the products of partial melting of chondritic protoliths, a mode of petrogenesis distin... | early silicic magmatism on a differentiated asteroid |
japan aerospace exploration agency (jaxa) launched the asteroid exploration probe "hayabusa2" in december 3rd, 2014, following the 1st hayabusa mission. with technological and scientific improvements from the hayabusa probe, we plan to visit the c-type asteroid 162137 ryugu (1999 ju3), and to sample surface materials o... | hayabusa2 sampler: collection of asteroidal surface material |
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