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a new (improved) model of inflation and primordial black hole (pbh) formation is proposed by combining the starobinsky model of inflation, appleby–battye–starobinsky (abs) model of dark energy, and a quantum correction in the modified f(r) gravity. the energy scale parameter in the abs model is taken to be close to the... | improved model of primordial black hole formation after starobinsky inflation |
it is well known that the near-earth objects population is sustained by bodies that migrate inwards from the main asteroid belt and outer regions of the solar system. in this work, we aim to revisit the dynamic evolution of the neo population inside the solar system using a known debiased population of large objects. t... | the known large near-earth objects' highways: dynamical evolution, fates, and lifetimes |
our knowledge of the internal structure of asteroids is, so far, indirect - relying entirely on inferences from remote sensing observations of the surface, and theoretical modeling of formation and evolution. what are the bulk properties of the regolith and deep interior? and what are the physical processes that shape ... | direct observations of asteroid interior and regolith structure: science measurement requirements |
aims: we present a study of the spectrophotometric properties of dwarf planet ceres in the visual-to-infrared (vis-ir) spectral range by means of hyper-spectral images acquired by the vir imaging spectrometer on board the nasa dawn mission.methods: disk-resolved observations with a phase angle within the 7° <α < ... | spectrophotometric properties of dwarf planet ceres from the vir spectrometer on board the dawn mission |
asteroid 2008 tc3 (approximately 4 m diameter) was tracked and studied in space for approximately 19 h before it impacted earth's atmosphere, shattering at 44-36 km altitude. the recovered samples (>680 individual rocks) comprise the meteorite almahata sitta (ahs). approximately 50-70% of these are ureilites (ultram... | origin and history of ureilitic material in the solar system: the view from asteroid 2008 tc3 and the almahata sitta meteorite |
the june 2, 2018 impact of asteroid 2018 la over botswana is only the second asteroid detected in space prior to impacting over land. here, we report on the successful recovery of meteorites. additional astrometric data refine the approach orbit and define the spin period and shape of the asteroid. video observations o... | the impact and recovery of asteroid 2018 la |
this paper investigates the laser polarization error in the optical rotation detection system (ords) of an atomic comagnetometer (acm), which will seriously degrade the long-term performance of the ords. we first establish an optical transmission model of the ords by using jones matrix concerning the optical imperfecti... | analysis and suppression of the polarization error for the optical rotation detection system in an atomic comagnetometer |
the origins, spectral-interpretation, resource-identification, security and regolith-explorer (osiris-rex) spacecraft supports all aspects of the mission science objectives, from extensive remote sensing at the asteroid bennu, to sample collection and return to earth. in general, the success of planetary missions requi... | the osiris-rex spacecraft and the touch-and-go sample acquisition mechanism (tagsam) |
a distinct set of broad emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 μm, is often detected in protoplanetary disks (ppds). these features are commonly attributed to polycyclic aromatic hydrocarbons (pahs). we model these emission features in the infrared spectra of 69 ppds around 14 t tauri and 55 herbig ae/... | polycyclic aromatic hydrocarbons in protoplanetary disks around herbig ae/be and t tauri stars |
we show that ‘oumuamua’s excited spin could be in a high-energy long axis mode (lam) state, which implies that its shape could be far from the highly elongated shape found in previous studies. clean and anova algorithms are used to analyze ‘oumuamua’s lightcurve using 818 observations over 29.3 days. two fundamental pe... | the excited spin state of 1i/2017 u1 ‘oumuamua |
sn 2016gkg is a nearby sn iib discovered shortly after explosion. like several other type iib events with early-time data, sn 2016gkg displays a double-peaked light curve, with the first peak associated with the cooling of a low-mass extended progenitor envelope. we present unprecedented intranight-cadence multi-band p... | constraints on the progenitor of sn 2016gkg from its shock-cooling light curve |
occultations of stars by asteroids have been observed since 1961, increasing from a very small number to now over 500 annually. we have created and regularly maintain a growing data set of more than 5000 observed asteroidal occultations. the data set includes the raw observations, astrometry at the 1 mas level based on... | precise astrometry and diameters of asteroids from occultations - a data set of observations and their interpretation |
the nature and origin of the asteroids orbiting in near-earth space, including those on a potentially hazardous trajectory, is of both scientific interest and practical importance. we aim here at determining the taxonomy of a large sample of near-earth and mars-crosser asteroids and analyze the distribution of these cl... | spectral properties of near-earth and mars-crossing asteroids using sloan photometry |
carbon impurities in gan form both acceptors and donors. donor-to-acceptor ratios (dars) determine the semi-insulating behavior of carbon-doped gan (gan:c) layers and are still debated. two models are discussed; both can theoretically achieve semi-insulating behavior: the dominant acceptor model (dam, dar < 1 ) and ... | mechanism leading to semi-insulating property of carbon-doped gan: analysis of donor acceptor ratio and method for its determination |
observations of the first interstellar minor object 1i/2017 ’oumuamua did not reveal direct signs of outgassing that would have been natural if it had a volatile-rich composition. however, a recent measurement by micheli et al. of a substantial non-gravitational acceleration affecting the orbit of this object has been ... | spin evolution and cometary interpretation of the interstellar minor object 1i/2017 ’oumuamua |
as differentiated planetesimals cool, their cores can solidify from the outside in1, as evidenced by palaeomagnetic measurements and cooling-rate estimates of iron meteorites2,3. the details of outside-in solidification and fate of residual core melt are poorly understood. for a core primarily composed of iron and nick... | ferrovolcanism on metal worlds and the origin of pallasites |
on 2019 january 5 a streamer associated with the 4-10 km main belt asteroid (6478) gault was detected by the atlas sky survey, a rare discovery of activity around a main belt asteroid. archival data from atlas and pan-starrs1 show the trail in early 2018 december, but not between 2010 and 2018 january. the feature has ... | the sporadic activity of (6478) gault: a yorp-driven event? |
1i/’oumuamua is the first interstellar interloper to be detected, and it shows a non-gravitational acceleration that cannot be accounted for by outgassing, given the strict upper limits of outgassing evident from spitzer observations, unless the relative abundances of the common volatiles are very different to those in... | could 1i/’oumuamua be an icy fractal aggregate? |
we perform n-body simulations of the early phases of open cluster evolution including a large population of planetesimals, initially arranged in kuiper-belt like discs around each star. using a new, fourth-order, and time-reversible n-body code on graphics processing units (gpus), we evolve the whole system under the s... | the fate of planetesimal discs in young open clusters: implications for 1i/'oumuamua, the kuiper belt, the oort cloud, and more |
containing only a few percentages of the mass of the moon, the current asteroid belt is around three to four orders of magnitude smaller than its primordial mass inferred from disk models. yet dynamical studies have shown that the asteroid belt could not have been depleted by more than about an order of magnitude over ... | excitation and depletion of the asteroid belt in the early instability scenario |
monolayers of anisotropic cells exhibit long-ranged orientational order and topological defects. during the development of organisms, orientational order often influences morphogenetic events. however, the linkage between the mechanics of cell monolayers and topological defects remains largely unexplored. this holds sp... | integer topological defects of cell monolayers: mechanics and flows |
as asteroids break up during atmospheric entry, they deposit energy that can be seen in flares of light and, if substantial enough, can produce damaging blast waves. analytic models of asteroid breakup and energy deposition processes are needed in order to assess potential airburst hazards, and to enable inferences abo... | a fragment-cloud model for asteroid breakup and atmospheric energy deposition |
after accretion of meteorite parent bodies, larger and smaller collisions have led to significant modifications of these bodies. involved processes include excavation of material, thermal metamorphism, melting, mixing of different materials, re-accretion, and re-lithification. all these processes can be repeated severa... | brecciation among 2280 ordinary chondrites - constraints on the evolution of their parent bodies |
whole rock δ17o and nucleosynthetic isotopic variations for chromium, titanium, nickel, and molybdenum in meteorites define two isotopically distinct populations: carbonaceous chondrites (ccs) and some achondrites, pallasites, and irons in one and all other chondrites and differentiated meteorites in the other. since d... | isotopic dichotomy among meteorites and its bearing on the protoplanetary disk |
the japan aerospace exploration agency launched the asteroid sample return spacecraft ;hayabusa2; on december 3, 2014. hayabusa2 will reach the c-type asteroid 1999 ju3 in 2018, and return back to the earth in 2020. sample collections from three sites, four surface rovers deployment and a 4 mj-class kinetic impact crat... | flight status of robotic asteroid sample return mission hayabusa2 |
many small bodies in the solar system have bulk density well below the solid density of the constituent mineral grains in their meteorite counterparts. those low-density bodies undoubtedly have significant porosity, which is a key factor that affects the formation of impact craters. this paper summarizes the results of... | impacts into porous asteroids |
one of the most enigmatic and hitherto unexplained properties of jupiter trojans is their bimodal color distribution. this bimodality is indicative of two sub-populations within the trojans, which have distinct size distributions. in this paper, we present a simple, plausible hypothesis for the origin and evolution of ... | a hypothesis for the color bimodality of jupiter trojans |
although the two moons of mars, phobos and deimos, have long been thought to be captured asteroids, recent observations of their compositions and orbits suggest that they may have formed from debris generated by one or more giant impacts of bodies with ∼0.01× target mass. recent studies have both analytically estimated... | formation of phobos and deimos via a giant impact |
the orbital evolution of the giant planets after nebular gas was eliminated from the solar system but before the planets reached their final configuration was driven by interactions with a vast sea of leftover planetesimals. several variants of planetary migration with this kind of system architecture have been propose... | capture of trans-neptunian planetesimals in the main asteroid belt |
stereophotoclinometry (spc) makes it possible to extract the shapes of surfaces by combining information from images, namely stereo parallax data and surface shading from slopes, with knowledge of the location of a spacecraft. this technique has been used extensively in the past few decades to describe the shapes of pl... | stereophotoclinometry on the osiris-rex mission: mathematics and methods |
the effect of protoplanetary differentiation on the fate of life-essential volatiles such as nitrogen and carbon and its subsequent effect on the dynamics of planetary growth is unknown. because the dissolution of nitrogen in magma oceans depends on its partial pressure and oxygen fugacity, it is an ideal proxy to trac... | rates of protoplanetary accretion and differentiation set nitrogen budget of rocky planets |
we report that object 282p/(323137) 2003 bm80 is undergoing a sustained activity outburst, lasting over 15 months thus far. these findings stem in part from our nasa partner citizen science project active asteroids (http://activeasteroids.net), which we introduce here. we acquired new observations of 282p via our obser... | migratory outbursting quasi-hilda object 282p/(323137) 2003 bm80 |
context. the recent close approach of the near-earth asteroid (3200) phaethon offered a rare opportunity to obtain high-quality observational data of various types.aims: we used the newly obtained optical light curves to improve the spin and shape model of phaethon and to determine its surface physical properties deriv... | (3200) phaethon: bulk density from yarkovsky drift detection |
we present an updated set of near-earth asteroids with a yarkovsky-related semimajor axis drift detected from the orbital fit to the astrometry. we find 87 reliable detections after filtering for the signal-to-noise ratio of the yarkovsky drift estimate and making sure the estimate is compatible with the physical prope... | detecting the yarkovsky effect among near-earth asteroids from astrometric data |
collisions are one of the key processes shaping planetary systems. asteroid families are outcomes of such collision still identifiable across our solar system. the families provide a unique view of catastrophic disruption phenomena and have been in the focus of planetary scientists for more than a century. most of them... | asteroid families: properties, recent advances, and future opportunities |
hayabusa2 was launched on 3 december 2014 on an h-iia launch vehicle from the tanegashima space center, and is, at the time of writing, cruising toward asteroid 162137 ryugu (1999ju3). after reaching the asteroid, it will stay for about 1.5 years to observe the asteroid and collect surface material samples. | development of the laser altimeter (lidar) for hayabusa2 |
current observations allow primordial black holes (pbhs) in asteroid mass range 1017- 1022 g to constitute the entire dark matter energy density (barring a small mass range constrained by 21-cm observations). in this work, we explore the possibility of probing pbhs with masses 1017- 1019 g via the upcoming x/gamma ray ... | future constraints on primordial black holes from xgis-theseus |
the planets of our solar system formed from a gas-dust disk. however, there are some properties of the solar system that are peculiar in this context. first, the cumulative mass of all objects beyond neptune (trans-neptunian objects [tnos]) is only a fraction of what one would expect. second, unlike the planets themsel... | outer solar system possibly shaped by a stellar fly-by |
hydrocarbon exploration in the last decade has yielded sufficient data to evaluate the gulf of mexico basin response to the chicxulub asteroid impact. given its passive marine setting and proximity to the impact structure on the yucatán peninsula, the gulf is the premier locale in which to study the near-field geologic... | the cretaceous-paleogene boundary deposit in the gulf of mexico: large-scale oceanic basin response to the chicxulub impact |
the near-earth object wide-field infrared survey explorer (neowise) mission continues to detect, track, and characterize minor planets. we present diameters and albedos calculated from observations taken during the second year since the spacecraft was reactivated in late 2013. these include 207 near-earth asteroids (ne... | neowise reactivation mission year two: asteroid diameters and albedos |
high-metallicity pollution is common in white dwarf (wd) stars hosting remnant planetary systems. however, they rarely have detectable debris accretion discs, possibly because much of the influx is fast steeply infalling debris in star-grazing orbits, producing a more tenuous signature than a slowly accreting disc. pro... | deposition of steeply infalling debris around white dwarf stars |
recent dynamical models of solar system evolution and isotope studies of rock-forming elements in meteorites have suggested that volatile-rich asteroids formed in the outer solar system beyond jupiter's orbit, despite being currently located in the main asteroid belt1-4. the ambient temperature under which asteroids fo... | migration of d-type asteroids from the outer solar system inferred from carbonate in meteorites |
we investigate the production of primordial black holes (pbhs) in a mixed inflaton-curvaton scenario with a quadratic curvaton potential, assuming the curvaton is in de sitter equilibrium during inflation with <χ> = 0. in this setup, the curvature perturbation sourced by the curvaton is strongly non-gaussian, con... | primordial black holes from a curvaton scenario with strongly non-gaussian perturbations |
we present a study of the active asteroid (3200) phaethon in the 2016 apparition using the solar and terrestrial relations observatory (stereo) spacecraft and compare the results with data from the previous two perihelia in 2009 and 2012. once again, phaethon brightened by ∼2 mag soon after its perihelion passage, cont... | resurrection of (3200) phaethon in 2016 |
the first interstellar object observed in our solar system, 1i/2017 u1 ('oumuamua), exhibited a number of peculiar properties, including extreme elongation and acceleration excess. recently, seligman & laughlin proposed that the object was made out of molecular hydrogen (h2) ice. the question is whether h2 objects ... | destruction of molecular hydrogen ice and implications for 1i/2017 u1 ('oumuamua) |
we present the discovery and extensive follow-up of a remarkable fast-evolving optical transient, at 2022aedm, detected by the asteroid terrestrial impact last alert survey (atlas). in the atlas o band, at 2022aedm exhibited a rise time of 9 ± 1 days, reaching a luminous peak with mg≈ -22 mag. it faded by 2 mag in the ... | at 2022aedm and a new class of luminous, fast-cooling transients in elliptical galaxies |
the tumultuous early era of outer solar system evolution culminated when neptune migrated across the primordial kuiper belt (pkb) and triggered a dynamical instability among the giant planets. this event led to the ejection of ~99.9% of the pkb (here called the destabilized population), heavy bombardment of the giant p... | the collisional evolution of the primordial kuiper belt, its destabilized population, and the trojan asteroids |
the study of structure, thermodynamic state, equation of state (eos) and transport properties of warm dense matter (wdm) has become one of the key aspects of laboratory astrophysics. this field has demonstrated its importance not only concerning the internal structure of planets, but also other astrophysical bodies suc... | experimental methods for warm dense matter research |
many air-less planetary bodies, including the moon, asteroids, and comets, are covered by regolith. the thermal conductivity of the regolith is an essential parameter controlling the surface temperature variation. a thermal conductivity model applicable to natural soils as well as planetary surface regolith is required... | thermal conductivity of lunar regolith simulant jsc-1a under vacuum |
hayabusa2, the first sample return mission to a c-type asteroid was launched by the japan aerospace exploration agency (jaxa) on december 3, 2014 and will arrive at the asteroid in the middle of 2018 to collect samples from its surface, which may contain both hydrated minerals and organics. the optical navigation camer... | initial inflight calibration for hayabusa2 optical navigation camera (onc) for science observations of asteroid ryugu |
the majority of stars both host planetary systems and evolve into a white dwarf (wd). to understand their post-main-sequence planetary system evolution, we present a search for transiting/eclipsing planets and other substellar bodies (sbs) around wds using a sample of 1148 wds observed by k2. using transit injections, ... | the occurrence of planets and other substellar bodies around white dwarfs using k2 |
in this work, we investigate the evolution of a primordial belt of asteroids, represented by a large number of massless test particles, under the gravitational effect of migrating jovian planets in the framework of the jumping-jupiter model. we perform several simulations considering test particles distributed in the m... | the evolution of asteroids in the jumping-jupiter migration model |
taurid meteor shower produces prolonged but usually low activity every october and november. in some years, however, the activity is significantly enhanced. previous studies based on long-term activity statistics concluded that the enhancement is caused by a swarm of meteoroids locked in 7:2 resonance with jupiter. her... | discovery of a new branch of the taurid meteoroid stream as a real source of potentially hazardous bodies |
we review recent studies of the cluster structure of light nuclei within the framework of the algebraic cluster model (acm) for nuclei composed of k α-particles and within the framework of the cluster shell model (csm) for nuclei composed of k α-particles plus x additional nucleons. the calculations, based on symmetry ... | cluster structure of light nuclei |
the asteroid (16) psyche is the largest of the m-type asteroids, which have been hypothesized to be the cores of disrupted planetesimals and the parent bodies of the iron meteorites. while recent evidence has collected against a pure metal composition for psyche, its spectrum and radar properties remain anomalous. we o... | the surface of (16) psyche from thermal emission and polarization mapping |
bo cet is renowned cataclysmic variable having an orbital period above the period gap (0.139835 d) and showing both features of a z cam/iw and star and an su uma star. using the asteroid terrestrial-impact last alert system (atlas) forced photometry and the all-sky automated survey for supernovae (asas-sn) sky patrol d... | su uma-type supercycle in the iw and-type dwarf nova bo cet above the period gap |
asassn-15cm had been identified as a dwarf nova with an orbital period of 5.0 hours and a hot, luminous secondary of of a spectral type around k2.5 in the previous study. using the zwicky transient facility (ztf) data, the asteroid terrestrial-impact last alert system (atlas) forced photometry and the all-sky automated... | asassn-15cm: an su uma star with an orbital period of 5.0 hours |
there is an unceasing incoming flux of extraterrestrial materials reaching the earth atmosphere. some of these objects produce luminous columns when they ablate during the hypersonic encounter with air molecules. a few fireballs occur each year bright enough to be detected from space. the source of these events is stil... | orbital characterization of superbolides observed from space: dynamical association with near-earth objects, meteoroid streams, and identification of hyperbolic meteoroids |
we studied the membership, size ratio and rotational properties of 13 asteroid clusters consisting of between 3 and 19 known members that are on similar heliocentric orbits. by backward integrations of their orbits, we confirmed their cluster membership and estimated times elapsed since separation of the secondaries (t... | asteroid clusters similar to asteroid pairs |
we present new results of polarimetric observations of 15 main belt asteroids of different composition. by merging new and published data we determined polarimetric parameters characterizing individual asteroids and mean values of the same parameters characterizing different taxonomic classes. the majority of asteroids... | refining the asteroid taxonomy by polarimetric observations |
finding the basic mechanism governing the surface history of asteroids of various shapes is essential for understanding their origin and evolution. in particular, the asteroids (162173) ryugu1 and (101955) bennu2 currently being visited by hayabusa2 and osiris-rex appear to be top shaped. this distinctive shape, charac... | reconstructing the formation history of top-shaped asteroids from the surface boulder distribution |
the hydrophilic nature of halogens makes these elements ideal for probing potential hydrous geologic processes. generally, in magmatic settings the stable isotopes of cl may fractionate when h is in low concentrations and little fractionation occurs when the h concentration is high. we determined the cl isotope composi... | chlorine and hydrogen degassing in vesta's magma ocean |
in single-star systems like our own solar system, comets dominate the mass budget of bodies ejected into interstellar space, since they form further away and are less tightly bound. however, 1i/`oumuamua, the first interstellar object detected, appears asteroidal in its spectra and lack of detectable activity. we argue... | ejection of rocky and icy material from binary star systems: implications for the origin and composition of 1i/`oumuamua |
during asteroid entry, energy is deposited in the atmosphere through thermal ablation and momentum-loss due to aerodynamic drag. analytic models of asteroid entry and breakup physics are used to compute the energy deposition, which can then be compared against measured light curves and used to estimate ground damage du... | asteroid fragmentation approaches for modeling atmospheric energy deposition |
this paper describes asteroid, the pytorch-based audio source separation toolkit for researchers. inspired by the most successful neural source separation systems, it provides all neural building blocks required to build such a system. to improve reproducibility, kaldi-style recipes on common audio source separation da... | asteroid: the pytorch-based audio source separation toolkit for researchers |
this document serves as a brief overview of the "safe and reliable machine learning" tutorial given at the 2019 acm conference on fairness, accountability, and transparency (fat* 2019). the talk slides can be found here: https://bit.ly/2gfsukp, while a video of the talk is available here: https://youtu.be/fglockc4kme, ... | tutorial: safe and reliable machine learning |
white dwarfs that have accreted planetary bodies are a powerful probe of the bulk composition of exoplanetary material. in this paper, we present a bayesian model to explain the abundances observed in the atmospheres of 202 dz white dwarfs by considering the heating, geochemical differentiation, and collisional process... | bayesian constraints on the origin and geology of exoplanetary material using a population of externally polluted white dwarfs |
we are conducting a survey using twilight time on the dark energy camera with the blanco 4 m telescope in chile to look for objects interior to earth's and venus' orbits. to date we have discovered two rare atira/apohele asteroids, 2021 lj4 and 2021 ph27, which have orbits completely interior to earth's orbit. we also ... | a deep and wide twilight survey for asteroids interior to earth and venus |
preliminary mission design requires an efficient and accurate approximation to the low-thrust rendezvous trajectories, which might be generally three-dimensional and involve multiple revolutions. in this paper, a new shaping method using cubic spline functions is developed for the analytical approximation, which shows ... | analytical shaping method for low-thrust rendezvous trajectory using cubic spline functions |
water ice near the surface of main belt asteroids is gradually lost to space. a mantle of low thermal conductivity causes large surface temperature amplitudes, and thus increased cooling by thermal re-radiation, lowering temperatures well below the fast-rotator limit. a computational barrier for modeling this ice loss ... | predictions of depth-to-ice on asteroids based on an asynchronous model of temperature, impact stirring, and ice loss |
the cr chondrites carry one of the most pristine records of the solar nebula materials that accreted to form planetesimals. they have experienced very variable degrees of aqueous alteration, ranging from incipient alteration in their matrices to the complete hydration of all of their components. in order to constrain t... | widespread oxidized and hydrated amorphous silicates in cr chondrites matrices: implications for alteration conditions and h2 degassing of asteroids |
phosphorus (p) is critical to modern biochemical functions and can control ecosystem growth. it was presumably important as a reagent in prebiotic chemistry. however, on the early earth, p sources may have consisted primarily of poorly soluble calcium phosphates, which may have rendered phosphate as a minimally availab... | phosphorus availability on the early earth and the impacts of life |
detecting celestial bodies while in deep-space travel is a critical task for the correct execution of space missions. major bodies such as planets are bright and therefore easy to observe, while small bodies can be faint and therefore difficult to observe. a critical task for both rendezvous and fly-by missions is to d... | celestial bodies far-range detection with deep-space cubesats |
the highly hydrated, petrologic type 1 cm and ci carbonaceous chondrites likely derived from primitive, water-rich asteroids, two of which are the targets for jaxa's hayabusa2 and nasa's osiris-rex missions. we have collected visible and near-infrared (vnir) and mid infrared (mir) reflectance spectra from well-characte... | linking mineralogy and spectroscopy of highly aqueously altered cm and ci carbonaceous chondrites in preparation for primitive asteroid sample return |
we report on the results of the analysis of spectral observations of the asteroid didymos at the time of impact of the dart mission probe, obtained a few minutes before, directly at the moment, and within a few minutes after the spacecraft hit the surface of the dimorphos. we found evidence of alkali metal emissions th... | observations of alkaline emissions nai, ki and lii during first minutes after dart probe impact on dimorphos |
the solar wind has been implicated as a source of water on airless bodies such as the moon, asteroids, and possibly mercury, yet a kinetic and mechanistic chemical model consistent with present-day observational data is still lacking. utilizing available data sets on temperature-driven water formation and desorption fr... | solar wind-induced water cycle on the moon |
asteroid exploration has a significant importance in promoting our understanding of the solar system and the origin of life on earth. a unique opportunity to study near-earth asteroid 99942 apophis will occur in 2029 because it will be at its perigee. in the current work, a drilling, sampling, and sample-handling syste... | drilling, sampling, and sample-handling system for china's asteroid exploration mission |
previous studies indicate that more than a quarter of all white dwarf (wd) atmospheres are polluted by remnant planetary material, with some wds being observed to accrete the mass of pluto in 106 yr. the short sinking time-scale for the pollutants indicates that the material must be frequently replenished. moons may co... | liberating exomoons in white dwarf planetary systems |
localized contractile configurations or asters spontaneously appear and disappear as emergent structures in the collective stochastic dynamics of active polar actomyosin filaments. passive particles which (un)bind to the active filaments get advected into the asters, forming transient clusters. we study the phase segre... | phase segregation of passive advective particles in an active medium |
the impact cratering record of the moon and the terrestrial planets provides important clues about the formation and evolution of the solar system. especially intriguing is the epoch ≃3.8-3.9 gyr ago (ga), known as the late heavy bombardment (lhb), when the youngest lunar basins such as imbrium and orientale formed. th... | modeling the historical flux of planetary impactors |
in the past decade, the number of known binary near-earth asteroids has more than quadrupled and the number of known large main-belt asteroids with satellites has doubled. half a dozen triple asteroids have been discovered, and the previously unrecognized populations of asteroid pairs and small main-belt binaries have ... | asteroid systems: binaries, triples, and pairs |
future gamma-ray experiments, such as the e-astrogam and amego telescopes, can detect the hawking radiation of photons from primordial black holes (pbhs) if they make up a fraction or all of dark matter. pbhs can analogously also hawking radiate new particles, which is especially interesting if these particles are most... | detecting axionlike particles with primordial black holes |
the closest perihelion pass of parker solar probe (psp), so far, occurred between 2021 november 16 and 26 and reached ~13.29 r ☉ from sun center. this pass resulted in very unique observations of the solar corona by the wide-field instrument for solar probe (wispr). wispr observed at least 10 coronal mass ejections (cm... | overview of the remote sensing observations from psp solar encounter 10 with perihelion at 13.3 r ⊙ |
on september 26th 2022, liciacube monitored double asteroid redirection test (dart) mission impact on asteroid dimorphos, which is the smaller component of a binary asteroid system. these close observations revealed the impact ejecta features of the first planetary defence test with a kinetic impactor. | impact observations of asteroid dimorphos via light italian cubesat for imaging of asteroids (liciacube) |
the application of a modern solving algorithm or method of resolving dynamical equations for small projectile of finite sizes orbiting to be captured in a trapped zigzaging oscillations on orbit around the another large asteroid and in a further inelastic colliding scenario with him (using a formulation of the elliptic... | capture in regime of a trapped motion with further inelastic collision for finite-sized asteroid in er3bp |
a comprehensive asteroid threat assessment requires the quantification of both the impact likelihood and resulting consequence across the range of possible events. this paper presents a probabilistic asteroid impact risk (pair) assessment model developed for this purpose. the model incorporates published impact frequen... | a probabilistic asteroid impact risk model: assessment of sub-300 m impacts |
when the origins, spectral interpretation, resource identification, and security-regolith explorer (osiris-rex) spacecraft collected a sample of surface material from asteroid bennu in 2020 october, it was the first time that an autonomous optical navigation system relying on natural terrain features had been used to g... | autonomous navigation performance using natural feature tracking during the osiris-rex touch-and-go sample collection event |
the origins, spectral interpretation, resource identification, and security-regolith explorer (osiris-rex) mission rendezvoused with asteroid (101955) bennu in 2018 with the primary objective of collecting a sample of regolith from the surface. as the first nasa asteroid sample return mission, osiris-rex deployed sever... | the use of digital terrain models for natural feature tracking at asteroid bennu |
meteoroid bombardment of the earth-moon system must have caused catastrophic damage to the terrestrial ecosphere. however, ancient meteoroid impacts and their relations to environmental changes are not well understood because of erosion and/or resurfacing processes on earth. here, we investigate the formation ages of 5... | asteroid shower on the earth-moon system immediately before the cryogenian period revealed by kaguya |
the asuka (a)-12236 meteorite has recently been classified as a cm carbonaceous chondrite of petrologic type 3.0/2.9 and is among the most primitive cm meteorites studied to date. here, we report the concentrations, relative distributions, and enantiomeric ratios of amino acids in water extracts of the a-12236 meteorit... | abundant extraterrestrial amino acids in the primitive cm carbonaceous chondrite asuka 12236 |
the apollo-derived tenet of an anhydrous moon has been contested following measurement of water in several lunar samples that require water to be present in the lunar interior. however, significant uncertainties exist regarding the flux, sources and timing of water delivery to the moon. here we address those fundamenta... | an asteroidal origin for water in the moon |
we present spectral measurements of a suite of mineral mixtures and meteorites that are possible analogs for asteroid (101955) bennu, the target asteroid for nasa's origins, spectral interpretation, resource identification, security, regolith explorer (osiris-rex) mission. the sample suite, which includes anhydrous and... | spectral characterization of analog samples in anticipation of osiris-rex's arrival at bennu: a blind test study |
osiris-rex (origins, spectral interpretation, resource identification, and security-regolith explorer) is a nasa mission to return a sample of asteroid (101955) bennu. photometric modeling of bennu's surface is a key element of both sample site characterization and our broader scientific understanding of the asteroid. ... | disk-resolved photometric modeling and properties of asteroid (101955) bennu |
remote sensing observations made by the spacecraft hayabusa provided the first direct evidence of a rubble-pile asteroid: 25143 itokawa. itokawa was found to have a surface structure very different from other explored asteroids; covered with coarse pebbles and boulders ranging at least from cm to meter size. the cumula... | cratering efficiency on coarse-grain targets: implications for the dynamical evolution of asteroid 25143 itokawa |
impacting an asteroid with a spacecraft traveling at high speed delivers an impulsive change in velocity to the body. in certain circumstances, this strategy could be used to deflect a hazardous asteroid, moving its orbital path off of an earth-impacting course. however, the efficacy of momentum delivery to asteroids b... | deflection by kinetic impact: sensitivity to asteroid properties |
the disruption of asteroids and comets produces cm-sized meteoroids that end up impacting the earth's atmosphere and producing bright fireballs that might have associated shock waves or, in geometrically favourable occasions excavate craters that put them into unexpected hazardous scenarios. the astrometric reduction o... | accurate 3d fireball trajectory and orbit calculation using the 3d-firetoc automatic python code |
the accretion of dark matter around the primordial black holes (pbhs) could lead to the formation of surrounding minihalos, whose mass can be several orders of magnitude higher than the central pbh mass. the gravitational microlensing produced by such dressed pbhs could be quite different from that of the bare pbhs, wh... | gravitational microlensing by dressed primordial black holes |
the growing popularity of cloud-based machine learning raises a natural question about the privacy guarantees that can be provided in such a setting. our work tackles this problem in the context where a client wishes to classify private images using a convolutional neural network (cnn) trained by a server. our goal is ... | gazelle: a low latency framework for secure neural network inference |
the astorb database at lowell observatory is an actively curated catalog of all known asteroids in the solar system. astorb has heritage dating back to the 1970s and has been publicly accessible since the 1990s. work began in 2015 to modernize the underlying database infrastructure, operational software, and associated... | the astorb database at lowell observatory |
the dart spacecraft will impact dimorphos (the secondary body of the didymos binary asteroid) to test the kinetic impactor deflection method against possibly hazardous near-earth asteroids. the dart impact ejecta plume, and possibly the impact crater, will be imaged by the liciacube spacecraft, hosted as a piggyback an... | dynamical evolution of ejecta from the dart impact on dimorphos |
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