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aqueous organic solid formation from formaldehyde via the formose reaction and subsequent reactions is a possible candidate for the origin of complex primitive chondritic insoluble organic matter (iom) and refractory carbon in comets. the rate of formation of organic solids from formaldehyde was studied as a function o... | a kinetic study of the formation of organic solids from formaldehyde: implications for the origin of extraterrestrial organic solids in primitive solar system objects |
asteroids that are targets of spacecraft missions are interesting because they present us with an opportunity to validate ground-based spectral observations. one such object is near-earth asteroid (nea) (162173) ryugu, which is the target of the japanese space agency's (jaxa) hayabusa2 sample return mission. we observe... | ground-based characterization of hayabusa2 mission target asteroid 162173 ryugu: constraining mineralogical composition in preparation for spacecraft operations |
we model a variety of meteoroid streams originating from asteroid 3200 phaethon and follow their dynamical evolution. the modelling is performed for several past perihelion passages of the parent body. the particles in the models are perturbed (i) only by the gravity of planets, and (ii) both by gravity and by the poyn... | meteor complex of asteroid 3200 phaethon: its features derived from theory and updated meteor data bases |
carbonates record information regarding the timing, nature and conditions of the fluids circulating through asteroid parent bodies during aqueous alteration events. determining carbonate abundances and their relationships with organic matter improves our understanding of the genesis of major carbonaceous components in ... | investigation of organo-carbonate associations in carbonaceous chondrites by raman spectroscopy |
aims: multi-epoch spitzer space telescope 24 μm data is utilized from the mipsgal and taurus legacy surveys to detect asteroids based on their relative motion.methods: infrared detections are matched to known asteroids and average diameters and albedos are derived using the near earth asteroid thermal model (neatm) for... | the kilometer-sized main belt asteroid population revealed by spitzer |
outer solar system exploration by a small spacecraft using a solar power sail is investigated. a solar power sail is an extended form of a solar sail that has thin-film solar cells attached over its surface. this concept makes it possible to generate a large amount of power with less weight resources than conventional ... | solar electric propulsion by a solar power sail for small spacecraft missions to the outer solar system |
vesta, the second most massive asteroid, has long been perceived as anhydrous. recent studies suggesting the presence of hydrated minerals and past subsurface water have challenged this long-standing perception. yet, direct geologic indications of water activity on vesta's surface were unexpected. herein we show eviden... | geomorphological evidence for transient water flow on vesta |
nucleosynthetic isotope anomalies of planetary materials provide insight into their genetic ties, informing our understanding of early solar system isotopic architecture and evolution. isotope anomalies of non‑carbonaceous (nc) and carbonaceous (cc) materials in multi-element space suggests their variability primarily ... | the nc-cc dichotomy explained by significant addition of cai-like dust to the bulk molecular cloud (bmc) composition |
asteroid (3200) phaethon is a near-earth apollo asteroid with an unusual orbit that brings it closer to the sun than any other known asteroid. its last close approach to the earth was in 2017 mid-december and the next one will be on 2026 october. previous rotationally time-resolved spectroscopy of phaethon showed that ... | rotational variation of the linear polarization of the asteroid (3200) phaethon as evidence for inhomogeneity in its surface properties |
the unique inner-belt asteroid 311p/panstarrs (formerly p/2013 p5) is notable for its sporadic, comet-like ejection of dust in nine distinct epochs spread over ∼250 days in 2013. this curious behavior has been interpreted as the product of localized, equatorward landsliding from the surface of an asteroid rotating at t... | the nucleus of active asteroid 311p/(2013 p5) panstarrs |
several datasets of pm2.5 concentrations over europe during the 1990-2015 period, were used to calculate health impacts from chronic exposure to total particle matter below 2.5 μm (i.e. pm2.5). the datasets used in the analysis include the european topic centre on air pollution and climate change mitigation (etc/acm), ... | long-term health impact assessment of total pm2.5 in europe during the 1990-2015 period |
the national aeronautics and space administration (nasa) psyche mission will visit the 226-km diameter main belt asteroid (16) psyche, our first opportunity to visit a metal-rich object at close range. the unique and poorly understood nature of psyche offers a challenge to the mission as we have little understanding of... | hypervelocity impact experiments in iron-nickel ingots and iron meteorites: implications for the nasa psyche mission |
cellular processes are influenced by liquid phase separation, but its role in dna repair is unclear. here, we show that in saccharomyces cerevisiae, liquid droplets made up of dna repair proteins cooperate with different types of dna damage-inducible intranuclear microtubule filaments (dims) to promote the clustering o... | dna repair by rad52 liquid droplets |
the chicxulub impact caused a crash in productivity in the world's oceans which contributed to the extinction of ∼75% of marine species. in the immediate aftermath of the extinction, export productivity was locally highly variable, with some sites, including the chicxulub crater, recording elevated export production. t... | early paleocene paleoceanography and export productivity in the chicxulub crater |
in this work we aim to constrain the slope of the size distribution of main-belt asteroids, at their primordial state. to do so we turn out attention to the part of the main asteroid belt between 2.82 and 2.96 au, the so-called "pristine zone", which has a low number density of asteroids and few, well separated asteroi... | reconstructing the size distribution of the primordial main belt |
the presence of giant planets influences potentially habitable worlds in numerous ways. massive celestial neighbors can facilitate the formation of planetary cores and modify the influx of asteroids and comets toward earth analogs later on. furthermore, giant planets can indirectly change the climate of terrestrial wor... | giant planets: good neighbors for habitable worlds? |
resonance orbits around a uniformly rotating asteroid are studied from the approach of periodic orbits in this work. three periodic families (denoted as i, ii, and iii in the paper) are fundamental in organizing the resonance families. for the planar case: (1) genealogy and stability of families i, ii and the prograde ... | genealogy and stability of periodic orbit families around uniformly rotating asteroids |
the ∼20-m sized asteroid that entered the earth's atmosphere at 19 km/s over the chelyabinsk region of russia on february 15, 2013, broke and deposited ∼500 kt of kinetic energy at 45-25 km altitude, causing an airburst strong enough to create widespread glass damage. the shockwave hit a densely populated area. more th... | study of injuries from the chelyabinsk airburst event |
in order to obtain the gravitational field of a general finite body inside its brillouin sphere, we developed a new method to compute the field accurately. first, the body is assumed to consist of some layers in a certain spherical polar coordinate system and the volume mass density of each layer is expanded as a macla... | precise and fast computation of the gravitational field of a general finite body and its application to the gravitational study of asteroid eros |
the effects of dynamical coupling between the rotational (attitude) and translational (orbital) motion of spacecraft near small solar system bodies is investigated. this coupling arises due to the weak gravity of these bodies, as well as solar radiation pressure. the traditional approach assumes a point-mass spacecraft... | coupled orbit-attitude dynamics and relative state estimation of spacecraft near small solar system bodies |
dark material on vesta may consist of carbonaceous chondrite-like material delivered by impact events. this study uses hypervelocity impact experiments to assess the viability of the impact delivery hypothesis. experiments reveal that impact events deliver significant fractions of the projectile to the target during im... | delivering a projectile component to the vestan regolith |
the hayabusa 2 mission is targeted to explore the asteroid (162173) 1999 ju3 and return surface as well as sub-surface samples through a novel impactor. upon its return, at the end of 2020, the spacecraft will release the capsule for earth re-entry and drift away from the planet. based on the current mission profile, t... | hayabusa 2 extension plan: asteroid selection and trajectory design |
astrometric positions of moving objects in the solar system have been measured using a variety of star catalogs in the past. previous work has shown that systematic errors in star catalogs can affect the accuracy of astrometric observations. that, in turn, can influence the resulting orbit fits for minor planets. in or... | star catalog position and proper motion corrections in asteroid astrometry ii: the gaia era |
we describe zstreak, a semi-real-time pipeline specialized in detecting small, fast-moving, near-earth asteroids (neas), which is currently operating on the data from the newly commissioned zwicky transient facility (ztf) survey. based on a prototype originally developed by waszczak et al. (2017) for the palomar transi... | toward efficient detection of small near-earth asteroids using the zwicky transient facility (ztf) |
it has been suggested that the comet-like activity of main belt comets (mbcs) is due to the sublimation of sub-surface water-ice that has been exposed as a result of their surfaces being impacted by meter-sized bodies. we have examined the viability of this scenario by simulating impacts between meter-sized and kilomet... | triggering sublimation-driven activity of main belt comets |
near-earth asteroids (neas) in the 1-100 meter size range are estimated to be ∼1,000 times more numerous than the ∼15,000 currently cataloged neas, most of which are in the 0.5-10 kilometer size range. impacts from 10-100 meter size neas are not statistically life-threatening, but may cause significant regional damage,... | small near-earth asteroids in the palomar transient factory survey: a real-time streak-detection system |
we observed the episodically active asteroid (6478) gault in 2020 with multiple telescopes in asia and north america and found that it is no longer active after its recent outbursts at the end of 2018 and the start of 2019. the inactivity during this apparition allowed us to measure the absolute magnitude of gault of h... | time-series and phase-curve photometry of the episodically active asteroid (6478) gault in a quiescent state using apo, growth, p200, and ztf |
context. the javalambre photometric local universe survey (j-plus) is an observational campaign that aims to obtain photometry in 12 ultraviolet-visible filters (0.3−1 μm) over ∼8500 deg2 of the sky observable from javalambre (teruel, spain). due to its characteristics and observation strategy, this survey will allow a... | j-plus: a first glimpse at the spectrophotometry of asteroids. the mooja catalog |
we calculate the present-day impact flux on mars and its variation over the martian year, using the current data on the orbital distribution of known mars-crossing minor planets. we adapt the öpik-wetherill formulation for calculating collision probabilities, paying careful attention to the non-uniform distribution of ... | the current impact flux on mars and its seasonal variation |
classical correlation can be locked via quantum means: quantum data locking. with a short secret key, one can lock an exponentially large amount of information in order to make it inaccessible to unauthorized users without the key. quantum data locking presents a resource-efficient alternative to one-time pad encryptio... | experimental quantum data locking |
comet 67p/churyumov-gerasimenko (67p) was imaged with the 2 m telescope at mt. wendelstein observatory in the alps. coma and tail monitoring was performed during 51 nights between 2015 august 22 and 2016 may 9. the images through r and i sloan digital sky survey (sdss) filters show the dust distribution around the come... | mt. wendelstein imaging of the post-perihelion dust coma of 67p/churyumov-gerasimenko in 2015/2016 |
the quadrantid meteor shower is among the strongest annual meteor showers, and has drawn the attention of scientists for several decades. the stream is unusual, among others, for several reasons: its very short duration around maximum activity (≈12-14 h) as detected by visual, photographic and radar observations, its r... | on the age and formation mechanism of the core of the quadrantid meteoroid stream |
the x-ray source 1e 161348-5055 in the supernova remnant rcw 103 recently exhibited x-ray activity typical of magnetars, i.e. neutron stars with magnetic fields ≳ 1014-1015 g. however, 1e 161348-5055 has an observed period of 6.67 h, in contrast to magnetars which have a spin period of seconds. here we describe a simpl... | ejector and propeller spin-down: how might a superluminous supernova millisecond magnetar become the 6.67 h pulsar in rcw 103 |
small asteroids intersecting earth's orbit can deliver extraterrestrial rocks to earth, called meteorites. this process is accompanied by a luminous phenomena in the atmosphere called bolides or fireballs. observations of bolides provide pre-atmospheric orbits of meteorites, physical and chemical properties of small as... | small near-earth asteroids as a source of meteorites |
we present an analysis of asteroid (3200) phaethon using coronagraphic observations from 2008 to 2022 by the cor2 cameras onboard the twin solar terrestrial relations observatory spacecraft. although undetected in individual images, phaethon was visible in stacks combined from the same perihelion observations, yet only... | perihelion activity of (3200) phaethon is not dusty: evidence from stereo/cor2 observations |
we study nodal librations of outer particles in the framework of the elliptical restricted three-body problem including general relativity (gr) effects. from an analytical treatment based on secular interactions up to quadrupole level, we derive equations that define the nodal libration region of an outer test particle... | constraints to the semimajor axis of outer particles with nodal librations by general relativity effects |
main-belt asteroid (16) psyche is the largest m-type asteroid, a class of object classically thought to be the metal cores of differentiated planetesimals and the parent bodies of the iron meteorites. de kleer, cambioni, and shepard (2021, https://doi.org/10.3847/psj/ac01ec) presented new data from the atacama large mi... | the heterogeneous surface of asteroid (16) psyche |
giant planet migration is an important phenomenon in the evolution of planetary systems. recent works have shown that giant planet growth and migration can shape the asteroid belt, but these works have not considered interactions between planetesimals. we have calculated the evolution of planetesimal disks, including p... | colliding in the shadows of giants: planetesimal collisions during the growth and migration of gas giants |
the surface geology of jupiter's trojan asteroids is one of the scientific investigations of the nasa lucy mission. a dedicated geology working group will implement these studies using primarily panchromatic and color imaging data and complement the interpretation of these data with theoretical models, such as collisio... | surface geology of jupiter's trojan asteroids |
both observations of c-type near-earth asteroids and laboratory investigations of carbonaceous chondritic meteorites provide strong evidence for a high microporosity of c-type asteroids. boulder microporosity values derived from in-situ measurements at the surface of the rubble-pile nea (162173) ryugu are as high as 55... | microporosity and parent body of the rubble-pile nea (162173) ryugu |
most close-in planetary satellites are in synchronous rotation, which is usually the stable end-point of tidal despinning. saturn's moon hyperion is a notable exception by having a chaotic rotation. hyperion's dynamical state is a consequence of its high eccentricity and its highly prolate shape. as many binary asteroi... | barrel instability in binary asteroids |
little is known about earth quasi-satellites, a class of near-earth small solar system bodies that orbit the sun but remain close to the earth, because they are faint and difficult to observe. here we use the large binocular telescope (lbt) and the lowell discovery telescope (ldt) to conduct a comprehensive physical ch... | lunar-like silicate material forms the earth quasi-satellite (469219) 2016 ho3 kamoʻoalewa |
we present classical and quantum algorithms for approximating partition functions of classical hamiltonians at a given temperature. our work has two main contributions: first, we modify the classical algorithm of štefankovič, vempala and vigoda (\emph{j.~acm}, 56(3), 2009) to improve its sample complexity; second, we q... | simpler (classical) and faster (quantum) algorithms for gibbs partition functions |
the formation of the solar system's giant planets predated the ultimate epoch of massive impacts that concluded the process of terrestrial planet formation. following their formation, the giant planets' orbits evolved through an episode of dynamical instability. several qualities of the solar system have recently been ... | the early instability scenario: mars' mass explained by jupiter's orbit |
context. after the discovery of rings around the largest known centaur object, (10199) chariklo, we carried out observation campaigns of stellar occultations produced by the second-largest known centaur object, (2060) chiron, to better characterize its physical properties and presence of material on its surroundings.ai... | constraints on (2060) chiron's size, shape, and surrounding material from the november 2018 and september 2019 stellar occultations |
we present recent updates and improvements of the graphical processing unit (gpu) n-body code genga. modern state-of-the-art simulations of planet formation require the use of a very high number of particles to accurately resolve planetary growth and to quantify the effect of dynamical friction. at present the practica... | genga. ii. gpu planetary n-body simulations with non-newtonian forces and high number of particles |
we present new thermophysical model fits of 1847 asteroids, deriving thermal inertia, diameter, and bond and visible geometric albedo. we use thermal flux measurements obtained by the wide-field infrared survey explorer (wise) during its fully cryogenic phase, when both the 12 μm (w3) and 22 μm (w4) bands were availabl... | thermal properties of 1847 wise-observed asteroids |
we combined the ground-based and gaia data release 3 (dr3) asteroid observations to determine the masses of 20 asteroids with asteroid-asteroid close encounters. in order to take full advantage of the high-precision observations from gaia, we use the fisher information to select appropriate model parameters and the mod... | dynamical masses of 20 asteroids determined with gaia dr3 asteroid observations |
we report observations of four asteroid-crossing events in transiting exoplanet survey satellite light curves masquerading as self-lensing pulses from binary systems containing main-sequence stars and black hole or neutron-star companions. the observed changes in flux and the durations of the events appear to be consis... | false-positive self-lensing events: tess observing asteroid-crossing events in disguise |
asteroids belonging to the ch spectral taxonomic class are defined by the presence of an absorption near 0.7 μm, which is interpreted as due to fe-bearing phyllosilicates. phyllosilicates also cause strong absorptions in the 3 μm region, as do other hydrated and hydroxylated minerals and h2o ice. over the past decade, ... | the ch-class asteroids: connecting a visible taxonomic class to a 3 μm band shape |
there is a correlation between the components of the yorp effect of most asteroids, which drives the obliquity and spin rate of the affected bodies in a consistent pattern. this allows for a clear and unambiguous picture for how the spin rates and poles of asteroids affected by yorp will evolve and simplifies the overa... | systematic structure and sinks in the yorp effect |
previous missions have revealed that small solar system bodies are topographically diverse, which raises an immense challenge to a lander that aims to perform scientific measurements at different locations on the surface of the target. in recent years, hopping mechanism has attracted considerable attention due to its a... | numerical simulations of the controlled motion of a hopping asteroid lander on the regolith surface |
the earth trojans are coorbitals librating around the lagrange points l 4 or l 5 of the sun-earth system. although many numerical studies suggest that they can maintain their dynamical status and be stable on timescales up to a few tens of thousands of years or even longer, they remain an elusive population. thus far o... | the second earth trojan 2020 xl5 |
the asteroid belt is the remnant of the original planetesimal population in the inner solar system. however, the asteroids currently have orbits with all possible values of eccentricities and inclinations compatible with long-term dynamical stability, whereas the initial planetesimal orbits should have been quasicircul... | the dynamical evolution of the asteroid belt |
unistellar has created the enhanced vision telescope (evscope), a compact telescope that amplifies light so users can see hundreds of nebulae and galaxies directly through its electronics eyepiece. it can also pinpoint and identify objects in the sky, making amateur astronomy fun and more accessible to the public. than... | unistellar evscopes: smart, portable, and easy-to-use telescopes for exploration, interactive learning, and citizen astronomy |
a seminal result of håstad [j. acm, 48(4):798--859, 2001] shows that it is np-hard to find an assignment that satisfies $\frac{1}{|g|}+\varepsilon$ fraction of the constraints of a given $k$-lin instance over an abelian group, even if there is an assignment that satisfies $(1-\varepsilon)$ fraction of the constraints, ... | optimal inapproximability of satisfiable $k$-lin over non-abelian groups |
nearly every star known to host planets will become a white dwarf, and nearly 100 planet-hosts are now known to be accompanied by binary stellar companions. here, we determine how a binary companion triggers instability in otherwise unconditionally stable single-star two-planet systems during the giant branch and white... | binary star influence on post-main-sequence multi-planet stability |
in this era of spatially resolved observations of planet-forming disks with atacama large millimeter array (alma) and large ground-based telescopes such as the very large telescope (vlt), keck, and subaru, we still lack statistically relevant information on the quantity and composition of the material that is building ... | the formation of planetary systems with spica |
we report petrologic studies and oxygen isotope analyses of normal and anomalous eucrites, termed eucrite-type achondrites. petrologically anomalous eucrite-type achondrites can have normal oxygen isotope compositions, and vice versa. two basaltic eucrites with normal oxygen isotope compositions contain pyroxenes with ... | eucrite-type achondrites: petrology and oxygen isotope compositions |
rising ocean temperatures are threatening marine species and populations worldwide, and ectothermic taxa are particularly vulnerable. echinoderms are an ecologically important phylum of marine ectotherms and shifts in their population dynamics can have profound impacts on the marine environment. the effects of warming ... | impacts of ocean warming on echinoderms: a meta‑analysis |
ten benthic fauna taxa in a polluted marine area adjacent to mcmurdo station, antarctica were deemed to be potential biomonitors because pcbs, ddts, pahs, copper, lead and/or zinc in their tissues were significantly higher than in tissues of taxa living in reference areas (p < 0.05). concentrations of pcbs and ddt w... | using epibenthic fauna as biomonitors of local marine contamination adjacent to mcmurdo station, antarctica |
the dynamics of lofted dust on airless bodies have been the subject of much study since the 1960s, when the lunar horizon glow was first observed. lofted dust dynamics have important implications for the evolution of an airless body's surface properties. to date, most of these studies have had to rely on assumptions of... | dynamics of electrostatically lofted dust on airless planetary bodies |
the osiris-rex (origins, spectral interpretation, resource identification, and security-regolith explorer) spacecraft collected a sample from the asteroid bennu in 2020. this achievement leveraged an autonomous optical navigation approach called natural feature tracking (nft). nft provided spacecraft state updates by c... | ground testing of digital terrain models to prepare for osiris-rex autonomous vision navigation using natural feature tracking |
context. the calern asteroid polarimetric survey (caps), a collaboration between the inaf astrophysical observatory of torino (italy) and the observatoire de la côte d'azur (nice, france), has produced new asteroid polarimetric data for a number of years, and is one of the most important, currently active projects of a... | the calern asteroid polarisation survey. an updated catalogue of asteroid polarimetric data |
context. shock-induced changes in ordinary chondrite meteorites related to impacts or planetary collisions are known to be capable of altering their optical properties. thus, one can hypothesize that a significant portion of the ordinary chondrite material may be hidden within the observed dark c/x asteroid population.... | experimental constraints on the ordinary chondrite shock darkening caused by asteroid collisions |
the velocity scaling method of ma et al., as an extension of nacozy's manifold correction scheme, can frequently take the solution of a numerical integration back to a surface determined by an integral of the equations of motion. an elliptic restricted three-body hamiltonian of the sun, major and minor planets in a rot... | implementation of the velocity scaling method for elliptic restricted three-body problems |
micromega, a miniaturized near-infrared hyperspectral microscope, has been selected to characterize in the laboratory the samples returned from ryugu by the hayabusa2 mission. micromega has been delivered to the extraterrestrial samples curation center of the japanese aerospace exploration agency at the institute of sp... | calibration and performances of the micromega instrument for the characterization of asteroid ryugu returned samples |
large clasts are common on extraterrestrial bodies, and these are traditionally termed "blocks" and "boulders". these two terms can easily raise confusion, however, because they are used in a sense that differs from geological definitions. several classifications of large clasts are currently in use in the earth scienc... | something more than boulders: a geological comment on the nomenclature of megaclasts on extraterrestrial bodies |
an intercomparison of different aerosol chemical characterization techniques has been performed as part of a chamber study of biogenic secondary organic aerosol (bsoa) formation and aging at the atmosphere simulation chamber saphir (simulation of atmospheric photochemistry in a large reaction chamber). three different ... | comparison of three aerosol chemical characterization techniques utilizing ptr-tof-ms: a study on freshly formed and aged biogenic soa |
after its release and a descent and bouncing phase, the hayabusa2 lander mascot came to a final rest and mascot's camera mascam acquired a set of images of the surface of ryugu. with mascam's instantaneous field of view of about 1 mrad, the images provide pixel scales from 0.2 to 0.5 mm pixel-1 in the foreground and up... | the hayabusa2 lander mascot on the surface of asteroid (162173) ryugu - stereo-photogrammetric analysis of mascam image data |
a phase-resolved wave model is derived from an ocean circulation model for the purpose of studying wave-current effects in nearshore zones. one challenge is to adapt the circulation model to the specificities of wave physics. this mainly concerns the consideration of non-hydrostatic effects and the parametrization of w... | 3d phase-resolved wave modelling with a non-hydrostatic ocean circulation model |
surface and subsurface materials of c-type near-earth asteroid 162173 ryugu were collected and successfully returned to the earth in the hayabusa2 mission. fourier transform infrared spectroscopy (ftir) has been conducted to characterize these returned samples as one of the initial descriptions in a non-destructive man... | homogeneity and heterogeneity in near-infrared ftir spectra of ryugu returned samples |
singhbhum craton in eastern india is one of the oldest and perhaps geologically and geophysically most complex geological terrains on the surface of the earth, containing a number of intra-cratonic archean volcanic suites. in the present study, we investigate mesoarchean volcanic rocks of the simlipal complex, a tiger ... | mineral chemistry, geochemistry and geophysical investigations of simlipal volcanics from eoarchean singhbhum craton (eastern india): geodynamic implications of pervasive plume-lithosphere interaction |
distant retrograde orbits (dros) gained a novel wave of fame in space mission design because of their numerous advantages within the framework of the us plans for bringing a large asteroid sample in the vicinity of the earth as the next target for human exploration. dros are stable solutions of the three-body problem t... | distant retrograde orbits and the asteroid hazard |
recognition of the main morphostructural features of the western edge of the huila plateau (sw angola) can be done by using remote sensing techniques associated with field work. a digital elevation model (dem) of the area was built for this purpose. this model is based on altimeter data acquired from the aster sensor, ... | morphostructural characterization of the western edge of the huila plateau (sw angola), based on remote sensing techniques |
compound-specific carbon isotope analysis (δ13c) of meteoritic organic compounds can be used to elucidate the abiotic chemical reactions involved in their synthesis. the soluble organic content of the murchison carbonaceous chondrite has been extensively investigated over the years, with a focus on the origins of amino... | compound-specific carbon isotope compositions of aldehydes and ketones in the murchison meteorite |
the dart (double asteroid redirection test) mission will impact a spacecraft on the secondary (dimorphos) of the binary asteroid system didymos in 2022 september, with the goal of altering the orbital period of dimorphos about didymos sufficiently to be observed from ground-based observations. numerical impact modeling... | spacecraft geometry effects on kinetic impactor missions |
asteroid families are the remnants of the catastrophic collision, and their fundamental physical properties provide us the information of their parent bodies and evolutions. especially, the orbit and spin characteristics can reflect the influences of the yarkovsky effect and the yarkovsky-o'keefe-radzievskii-paddack (y... | study on the spin characteristics of the flora asteroid family |
we have recently shown that spiral density waves propagating in accretion disks can undergo a parametric instability by resonantly coupling with and transferring energy into pairs of inertial waves (or inertial-gravity waves when buoyancy is important). in this paper, we perform inviscid three-dimensional global hydrod... | the spiral wave instability induced by a giant planet. i. particle stirring in the inner regions of protoplanetary disks |
to date, reflectance spectra of jupiter trojan asteroids have revealed no distinctive absorption features. for this reason, the surface composition of these objects remains a subject of speculation. spectra have revealed, however, that the jupiter trojan asteroids consist of two distinct sub-populations that differ in ... | the 3-4 μm spectra of jupiter trojan asteroids |
asteroids in mean motion resonances with giant planets are common in the solar system, but it was not until recently that several asteroids in retrograde mean motion resonances with jupiter and saturn were discovered. a retrograde co-orbital asteroid of jupiter, 2015 bz509 is confirmed to be in a long-term stable retro... | dynamic portrait of the retrograde 1:1 mean motion resonance |
we present the k2 light curves of a large sample of untargeted main-belt asteroids (mbas) detected with the kepler space telescope. the asteroids were observed within the uranus superstamp, a relatively large, continuous field with a low stellar background designed to cover the planet uranus and its moons during campai... | main-belt asteroids in the k2 uranus field |
near-earth asteroid (3200) phaethon is notable for its association with a strong annual meteor shower, the geminids, indicative of one or more episodes of mass ejection in the past. the mechanism of phaethon’s past activity is not yet understood. here, we present a hubble space telescope (hst) search of meter-sized fra... | in search of recent disruption of (3200) phaethon: model implication and hubble space telescopesearch |
the development of an immersion-and invariance-based adaptive state variable feedback control law for the closed orbit and hovering control of spacecraft in the vicinity of asteroids is the subject of this paper. the celestial body is assumed to be rotating with constant angular velocity about a fixed axis. also, it is... | immersion-and invariance-based adaptive control of asteroid-orbiting and - hovering spacecraft |
the two clearwater lake impact structures (québec, canada) are generally interpreted as a crater doublet formed by the impact of a binary asteroid. here, arguments are presented that raise important questions about the proposed double impact scenario. new 40ar/39ar dating of two virtually fresh impact melt rock samples... | new 40ar/39ar dating of the clearwater lake impact structures (québec, canada) - not the binary asteroid impact it seems? |
the close-proximity exploration of small celestial bodies of our solar system is the current frontier of space exploration. trajectory design and exploitation of the natural dynamics around such bodies represents a very challenging astrodynamics problem, due to their weak and highly chaotic gravitational environment. t... | ballistic landing design on binary asteroids: the aim case study |
the mascot radiometer mara on board the hayabusa2 mission will measure surface brightness temperatures on the surface of asteroid (162173) ryugu in six wavelength bands. here we present a method to constrain surface thermophysical properties from mara measurements. moreover, uncertainties when determining surface therm... | a method to derive surface thermophysical properties of asteroid (162173) ryugu (1999ju3) from in-situ surface brightness temperature measurements |
the first known asteroid with the orbit inside that of venus is 2020 av2. this may be the largest member of a new population of small bodies with the aphelion smaller than 0.718 au, called vatiras. the surface of 2020 av2 is being constantly modified by the high temperature, by the strong solar wind irradiation that ch... | physical characterization of 2020 av2, the first known asteroid orbiting inside venus orbit |
the satellite of (225088) 2007 or10 was discovered on archival hubble space telescope images and along with new observations with the wfc3 camera in late 2017 we have been able to determine the orbit. the orbit's notable eccentricity, e ≈ 0.3, may be a consequence of an intrinsically eccentric orbit and slow tidal evol... | the mass and density of the dwarf planet (225088) 2007 or10 |
gravitational features are a fundamental source of information to learn more about the interior structure and composition of planets, moons, asteroids, and comets. gravitational field modeling typically approximates the target body with a sphere, leading to a representation in spherical harmonics. however, small celest... | spheroidal and ellipsoidal harmonic expansions of the gravitational potential of small solar system bodies. case study: comet 67p/churyumov-gerasimenko |
we present thermal infrared observations of the active asteroid (and geminid meteoroid stream parent) 3200 phaethon using the very large telescope. the images, at 10.7 μm wavelength, were taken with phaethon at its closest approach to earth (separation of 0.07 au) in 2017 december, at a linear resolution of about 14 km... | high-resolution thermal infrared imaging of 3200 phaethon |
we have carried out simulations to predict the performance of a new space-based telescopic survey operating at thermal infrared wavelengths that seeks to discover and characterize a large fraction of the potentially hazardous near-earth asteroid (nea) population. two potential architectures for the survey were consider... | survey simulations of a new near-earth asteroid detection system |
observations in 2013 and 2014 of the centaur 10199 chariklo and its ring system consistently indicated that the radial width of the inner, more massive ring varies with longitude. that strongly suggests that this ring has a finite eccentricity despite the fast differential precession that chariklo’s large quadrupole mo... | on the mass and origin of chariklo’s rings |
1i/`oumuamua is the first interstellar object observed passing through the solar system. understanding the nature of these objects will provide crucial information about the formation and evolution of planetary systems, and the chemodynamical evolution of the galaxy as a whole. we obtained the galactic orbital paramete... | a kinematical age for the interstellar object 1i/`oumuamua |
we present multiepoch infrared photometry and spectroscopy obtained with warm spitzer, subaru, and the stratospheric observatory for infrared astronomy to assess variability for the young (∼20 myr) and dusty debris systems around hd 172555 and hd 113766a. no variations (within 0.5%) were found for the former at either ... | mid-infrared studies of hd 113766 and hd 172555: assessing variability in the terrestrial zone of young exoplanetary systems |
biologically relevant abiotic extraterrestrial soluble organic matter (som) has been widely investigated to study the origin of life and the chemical evolution of protoplanetary disks. synthesis of biologically relevant organics, in particular, seems to require aqueous environments in the early solar system. however, s... | aqueous alteration on asteroids simplifies soluble organic matter mixtures |
the zodiacal dust complex, a population of dust and small particles that pervades the solar system, provides important insight into the formation and dynamics of planets, comets, asteroids, and other bodies. we present a new set of data obtained from direct measurements of momentum transfer to a spacecraft from individ... | micrometeoroid events in lisa pathfinder |
through their delivery of water and organics, near-earth objects (neos) played an important role in the emergence of life on our planet. however, they also pose a hazard to the earth, as asteroid impacts could significantly affect our civilization. potentially hazardous asteroids (phas) are those that, in principle, co... | grasping the nature of potentially hazardous asteroids |
we apply our novel markov chain monte carlo (mcmc)-based algorithm for asteroid mass estimation to asteroid (16) psyche, the target of nasa's eponymous psyche mission, based on close encounters with 10 different asteroids, and obtain a mass of (1.117 ± 0.039) × 10-11 m⊙. we ensure that our method works as expected by a... | mass and density of asteroid (16) psyche |
context. spectrophotometry data of asteroids obtained in the 1980s showed that there are large variations in their near-ultraviolet (nuv) reflectance spectra. reflectance spectra at nuv wavelengths are important because they help detect the presence of hydrated minerals and organics on the asteroid surfaces. however, t... | near-ultraviolet to visible spectroscopy of the themis and polana-eulalia complex families |
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