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phobos and deimos occupy unique positions both scientifically and programmatically on the road to the exploration of the solar system. japan aerospace exploration agency (jaxa) plans a phobos sample return mission (mmx: martian moons exploration). the mmx spacecraft is scheduled to be launched in 2024, orbit both phobo... | the importance of phobos sample return for understanding the mars-moon system |
carbonaceous chondrites (ccs) are important materials for understanding the early evolution of the solar system and delivery of volatiles and organic material to the early earth. presumed cc-like asteroids are also the targets of two current sample return missions: osiris-rex to asteroid bennu and hayabusa-2 to asteroi... | spectral reflectance "deconstruction" of the murchison cm2 carbonaceous chondrite and implications for spectroscopic investigations of dark asteroids |
a number of earth co-orbital asteroids experience repeated transitions between the quasi-satellite and horseshoe dynamical states. asteroids 2001 go2, 2002 aa29, 2003 yn107 and 2015 so2 are well-documented cases of such a dynamical behaviour. these transitions depend on the gravitational influence of other planets, owi... | asteroid (469219) 2016 ho3, the smallest and closest earth quasi-satellite |
since 2017, two macroscopic interstellar objects have been discovered in the inner solar system, both of which are distinct in nature. the first interstellar object, 1i/`oumuamua, passed within $\sim63$ lunar distances of the earth, appeared asteroidal lacking detectable levels of gas or dust loss, yet exhibited a nong... | interstellar objects |
wd j204713.76-125908.9 is a new addition to the small class of white dwarfs with helium-dominated photospheres that exhibit strong balmer absorption lines and atmospheric metal pollution. the exceptional abundances of hydrogen observed in these stars may be the result of accretion of water-rich rocky bodies. we obtaine... | white dwarf pollution by hydrated planetary remnants: hydrogen and metals in wd j204713.76-125908.9 |
we provide a scheme to correct asteroid astrometric observations for star catalog systematic errors due to inaccurate star positions and proper motions. as reference we select the most accurate stars in the ppmxl catalog, i.e., those based on 2mass astrometry. we compute position and proper motion corrections for 19 of... | star catalog position and proper motion corrections in asteroid astrometry |
we examined two decades of spex/nasa infrared telescope facility observations from the small main-belt asteroid spectroscopic survey (smass) and the mit-hawaii near-earth object spectroscopic survey (mithneos) to investigate uncertainties and systematic errors in reflectance spectral slope measurements of asteroids. fr... | twenty years of spex: accuracy limits of spectral slope measurements in asteroid spectroscopy |
in this paper, the methods and results from tsinghua university and shanghai institute of satellite engineering for the 11th global trajectory optimization competition (gtoc11) are presented. to deal with the complicated "dyson sphere" building problem, a three-stage procedure is conducted. first, the pre-analysis is p... | gtoc 11: results from tsinghua university and shanghai institute of satellite engineering |
we consider how qcd axions produced by the misalignment mechanism could form galactic dark matter halos. we recall that stationary, gravitationally stable axion field configurations have the size of an asteroid with masses of order 10-13m⊙ (because gradient pressure is insufficient to support a larger object). we call ... | rotating drops of axion dark matter |
unravelling the origin of organic compounds that were accreted into asteroids requires better constraining the impact of asteroidal hydrothermal alteration on their isotopic signatures, molecular structures, and spatial distribution. here, we conducted a multi-scale/multi-technique comparative study of the organic matt... | paris vs. murchison: impact of hydrothermal alteration on organic matter in cm chondrites |
with a hyperbolic trajectory around the sun, ‘oumuamua is the first confirmed interstellar object. however, its origin is poorly known. by simulating the orbits of 0.23 million local stars, we find 109 encounters with periastron less than 5 pc. ‘oumuamua’s low peculiar velocity is suggestive of its origin from a young ... | ‘oumuamua as a messenger from the local association |
chondrules formed by the melting of dust aggregates in the solar protoplanetary disk and as such provide unique insights into how solid material was transported and mixed within the disk. here, we show that chondrules from enstatite and ordinary chondrites show only small 50ti variations and scatter closely around the ... | mixing and transport of dust in the early solar nebula as inferred from titanium isotope variations among chondrules |
one of the major unresolved problems in cosmochemistry is the origin of chondrules, once molten, spherical silicate droplets with diameters of 0.2 to 2 mm. chondrules are an essential component of primitive meteorites and perhaps of all early solar system materials including the terrestrial planets. numerous hypotheses... | the origin of chondrules: constraints from matrix composition and matrix-chondrule complementarity |
we discuss problems of planetesimal migration in the emerging solar system and exoplanetary systems. protoplanetary disk evolution models and the formation of planets are considered. the formation of the moon and of the asteroid and trans-neptunian belts is studied. we show that earth and venus could acquire more than ... | migration processes in the solar system and their role in the evolution of the earth and planets |
complexity theory traditionally studies the hardness of solving classical computational problems. in the quantum setting, it is also natural to consider a different notion of complexity, namely the complexity of physically preparing a certain quantum state. we study the relation between two such state complexity classe... | stateqip = statepspace |
we study the abstract problem of rounding fractional bipartite $b$-matchings online. the input to the problem is an unknown fractional bipartite $b$-matching, exposed node-by-node on one side. the objective is to maximize the \emph{rounding ratio} of the output matching $\mathcal{m}$, which is the minimum over all frac... | online dependent rounding schemes |
primordial black holes (pbhs) are predicted in many models via different formation mechanisms. identifying the origin of pbhs is of the same importance as probing their existence. we propose to probe the asteroid-mass pbhs [𝒪(1017) g ≲ m ≲ 𝒪 (1022) g] with gamma-rays from hawking radiation and the stochastic gravitat... | pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves |
the geology in the wuliji area (including the enger us and quagan qulu areas) is important for understanding the late paleozoic tectonics of the solonker zone. ultramafic/mafic rocks in the enger us area, previously interpreted as an ophiolitic suture, are actually lava flows and sills in a permian turbiditic sequence ... | late paleozoic tectonics of the solonker zone in the wuliji area, inner mongolia, china: insights from stratigraphic sequence, chronology, and sandstone geochemistry |
asteroids provide fundamental clues to the formation and evolution of planetesimals. collisional models based on the depletion of the primordial main belt of asteroids predict 10-15 craters >400 km should have formed on ceres, the largest object between mars and jupiter, over the last 4.55 gyr. likewise, an extrapol... | the missing large impact craters on ceres |
this paper presents the robust planning of the hayabusa2-ryugu proximity operation and landing site selection process considering unknown asteroid environment and the spacecraft constraints. the proximity operation scenario is described together with the relationship between the selection process and the in-situ observ... | hayabusa2-ryugu proximity operation planning and landing site selection |
resolving the timing of crustal processes and meteorite impact events is central to understanding the formation, evolution and habitability of planetary bodies. however, identifying multi-stage events from complex planetary materials is highly challenging at the length scales of current isotopic techniques. here we sho... | atomic-scale age resolution of planetary events |
deciphering the spatial and temporal evolution of chondrules allows for a better understanding of how asteroidal seeds formed, migrated, and eventually accreted into parent asteroids. here we report high precision al-mg ages and oxygen three-isotope ratios of fifteen feo-poor chondrules from the least metamorphosed mig... | a temporal shift of chondrule generation from the inner to outer solar system inferred from oxygen isotopes and al-mg chronology of chondrules from primitive cm and co chondrites |
natural hazards include a wide range of high-impact phenomena that affect socioeconomic and natural systems. landslides are a natural hazard whose destructive power has caused a significant number of victims and substantial damage around the world. remote sensing provides many data types and techniques that can be appl... | evaluation of unsupervised change detection methods applied to landslide inventory mapping using aster imagery |
high-pressure minerals in meteorites are important records of shock events that have affected the surfaces of planets and asteroids. a widespread distribution of impact craters has been observed on the vestan surface. however, very few high-pressure minerals have been discovered in howardite-eucrite-diogenite (hed) met... | high-pressure minerals in eucrite suggest a small source crater on vesta |
a model for fragmentation in bench blasting is developed from dimensional analysis adapted from asteroid collision theory, to which two factors have been added: one describing the discontinuities spacing and orientation and another the delay between successive contiguous shots. the formulae are calibrated by nonlinear ... | a distribution-free description of fragmentation by blasting based on dimensional analysis |
many boulders on (101955) bennu, a near-earth rubble pile asteroid, show signs of in situ disaggregation and exfoliation, indicating that thermal fatigue plays an important role in its landscape evolution. observations of particle ejections from its surface also show it to be an active asteroid, though the driving mech... | thermal fatigue as a driving mechanism for activity on asteroid bennu |
measurements of the low-temperature thermodynamic and physical properties of meteorites provide fundamental data for the study and understanding of asteroids and other small bodies. of particular interest are the cm carbonaceous chondrites, which represent a class of primitive meteorites that record substantial chemica... | the surprising thermal properties of cm carbonaceous chondrites |
graham et al. reported a periodically varying quasar and supermassive black hole binary candidate, pg1302-102 (hereafter pg1302), which was discovered in the catalina real-time transient survey (crts). its combined lincoln near-earth asteroid research (linear) and crts optical light curve is well fitted to a sinusoid o... | did asas-sn kill the supermassive black hole binary candidate pg1302-102? |
context. asteroid (16) psyche is the target of the nasa psyche mission. it is considered one of the few main-belt bodies that could be an exposed proto-planetary metallic core and that would thus be related to iron meteorites. such an association is however challenged by both its near- and mid-infrared spectral propert... | (16) psyche: a mesosiderite-like asteroid? |
the restricted planar elliptic three body problem (rpetbp) describes the motion of a massless particle (a comet or an asteroid) under the gravitational field of two massive bodies (the primaries, say the sun and jupiter) revolving around their center of mass on elliptic orbits with some positive eccentricity. the aim o... | global instability in the restricted planar elliptic three body problem |
observations of debris disks offer a window into the physical and dynamical properties of planetesimals in extrasolar systems through the size distribution of dust grains. in particular, the millimeter spectral index of thermal dust emission encodes information on the grain size distribution. we have made new vla obser... | constraints on planetesimal collision models in debris disks |
this study exploited the multispectral advanced spaceborne thermal emission and reflection radiometer (aster) and landsat 8 operational land imager (oli) data in order to map lithological units and structural map in the south high atlas of marrakech. the method of analysis was used by principal component analysis (pca)... | lithological mapping using landsat 8 oli and aster multispectral data in imini-ounilla district south high atlas of marrakech |
the isotopic composition of water in earth's oceans is challenging to recreate using a plausible mixture of known extraterrestrial sources such as asteroids—an additional isotopically light reservoir is required. the sun's solar wind could provide an answer to balance earth's water budget. we used atom probe tomography... | solar wind contributions to earth's oceans |
collected by mars rovers and orbiters data allowed to reconstruct the possible stages in the development on the planet mars. it is believed that the first geological era of the planet - fillotsian - started 4.5 billion years ago. it lasted for 500-700 million years. at that time, mars was a wet planet. today mars is a ... | processes on the "young" mars: possible developments of events |
availability of multispectral remote sensing data cheaply and its higher spectral resolution compared to remote sensing data with higher spatial resolution has proved valuable for geological mapping exploitation and mineral mapping. this has benefited applications such as landslide quantification, fault pattern mapping... | a comparison of landsat 8 (oli) and landsat 7 (etm+) in mapping geology and visualising lineaments: a case study of central region kenya |
we measured 3-μm reflectance spectra of 21 meteorites that represent all carbonaceous chondrite types available in terrestrial meteorite collections. the measurements were conducted at the laboratory for spectroscopy under planetary environmental conditions (labspec) at the johns hopkins university applied physics labo... | 3-μm reflectance spectroscopy of carbonaceous chondrites under asteroid-like conditions |
two extremely red main-belt asteroids, 203 pompeja and 269 justitia, were identified from combined visible and near-infrared spectroscopic observations collected at the infra-red telescope facility (irtf) and seoul national university astronomical observatory (sao). these two asteroids have a redder spectral slope than... | discovery of two tno-like bodies in the asteroid belt |
cubesats offer a flexible and low-cost option to increase the scientific and technological return of small-body exploration missions. esa's hera mission, the european component of the asteroid impact and deflection assessment (aida) international collaboration, plans on deploying two cubesats in the proximity of binary... | preliminary mission profile of hera's milani cubesat |
a simple phenomenological fit for the power spectrum of scalar (curvature) perturbations during inflation is proposed to analytically describe slow roll of inflaton and formation of primordial black holes (pbh) in the early universe, in the framework of single-field models. the fit is given by a sum of the power spectr... | fitting power spectrum of scalar perturbations for primordial black hole production during inflation |
volatile compositions of asteroids provide information on the solar system history and the origins of earth's volatiles. visible to near-infrared observations at wavelengths of <2.5 µm have suggested a genetic link between outer main belt asteroids located at 2.5-4 au and carbonaceous chondrite meteorites (ccs) that... | distant formation and differentiation of outer main belt asteroids and carbonaceous chondrite parent bodies |
the cm carbonaceous chondrite meteorites experienced aqueous alteration in the early solar system. they range from mildly altered type 2 to almost completely hydrated type 1 chondrites, and offer a record of geochemical conditions on water-rich asteroids. we show that cm1 chondrites contain abundant (84-91 vol%) phyllo... | type 1 aqueous alteration in cm carbonaceous chondrites: implications for the evolution of water-rich asteroids |
most navigation solutions which make use of lidar for proximity operations with respect to non-cooperative objects rely on the iterative closest point, or icp, algorithm. for correct convergence, icp requires a good initial guess as to the 6 degree-of-freedom relative pose of a client object. some solutions require man... | lidar-based relative navigation with respect to non-cooperative objects |
tir, the thermal infrared imager on hayabusa2, acquired high-resolution thermal images of the asteroid 162173 ryugu for one asteroid rotation period on august 1, 2018 to investigate the thermophysical properties of the asteroid. the surface temperatures of ryugu suggest that the surface has a low thermal inertia, indic... | thermophysical properties of the surface of asteroid 162173 ryugu: infrared observations and thermal inertia mapping |
the asteroid 101955 bennu is the target asteroid of the ongoing asteroid sample return mission osiris-rex from nasa. in the mission, the spacecraft is scheduled to rendezvous with bennu in august 2018. investigating the dynamics of surface motion can offer guidance for further hopping landers or even sample return miss... | the motion of surface particles for the asteroid 101955 bennu |
the presence of h2o within differentiated terrestrial bodies in the inner solar system is well established; however, the source(s) of this h2o and the time of its arrival to the inner solar system is an area of active study. at present, the prevailing model for the origin of inner solar system h2o calls upon carbonaceo... | origin and abundances of h2o in the terrestrial planets, moon, and asteroids |
carbonaceous chondrites (cc) contain a diversity of organic compounds. no definitive evidence for a genetic relationship between these complex organic molecules and the simple organic molecules detected in the interstellar medium (ism) has yet been reported. one of the many difficulties arises from the transformations ... | evolution of interstellar organic compounds under asteroidal hydrothermal conditions |
chondrules, mm-sized igneous-textured spherules, are the dominant bulk silicate constituent of chondritic meteorites and originate from highly energetic, local processes during the first million years after the birth of the sun. so far, an astrophysically consistent chondrule formation scenario explaining major chemica... | impact splash chondrule formation during planetesimal recycling |
we fit 54,296 sparsely sampled asteroid light curves in the palomar transient factory survey to a combined rotation plus phase-function model. each light curve consists of 20 or more observations acquired in a single opposition. using 805 asteroids in our sample that have reference periods in the literature, we find th... | asteroid light curves from the palomar transient factory survey: rotation periods and phase functions from sparse photometry |
we present recent improvements of the modeling of the disruption of strength dominated bodies using the smooth particle hydrodynamics (sph) technique. the improvements include an updated strength model and a friction model, which are successfully tested by a comparison with laboratory experiments. in the modeling of ca... | sph calculations of asteroid disruptions: the role of pressure dependent failure models |
we compare primitive near-earth asteroid spectral properties to the irradiated carbonaceous chondrite samples of lantz et al. (2017) in order to assess how space weathering processes might influence taxonomic classification. using the same eigenvectors from the asteroid taxonomy by demeo et al. (2009), we calculate the... | space weathering trends on carbonaceous asteroids: a possible explanation for bennu's blue slope? |
we report the discovery of a stripped giant + lower giant algol-type binary, 2m04123153+6738486 (2m0412), identified during a search for non-interacting compact object - star binaries. 2m0412 is an evolved (teff, giant ≃ 4000 k), luminous (lgiant ≃ 150 l⊙) red giant in a circular p = 81.2 d binary. 2m0412 is a known va... | the 'giraffe': discovery of a stripped red giant in an interacting binary with an 2 m⊙ lower giant |
the new horizons spacecraft fly-through of the pluto system in july 2015 will provide humanity's first data for the crater populations on pluto and its binary companion, charon. in principle, these surfaces could be dated in an absolute sense, using the observed surface crater density (# craters/km2 larger than some th... | impact and cratering rates onto pluto |
the thermal infrared imager tir onboard hayabusa2 has been developed to investigate thermo-physical properties of c-type, near-earth asteroid 162173 ryugu. tir is one of the remote science instruments on hayabusa2 designed to understand the nature of a volatile-rich solar system small body, but it also has significant ... | thermal infrared imaging experiments of c-type asteroid 162173 ryugu on hayabusa2 |
we performed pulsed-laser irradiation of a chip of the cm2 murchison carbonaceous chondrite meteorite to simulate micrometeorite impacts on carbonaceous asteroids. optical reflectance spectroscopy and transmission electron microscopy were performed to characterize the unirradiated and irradiated samples and vapor and m... | spectral and chemical effects of simulated space weathering of the murchison cm2 carbonaceous chondrite |
discovery of the first interstellar asteroid (isa)—1i/2017 ’oumuamua—raised natural questions regarding its origin, some related to its lack of cometary activity, suggesting refractory composition. here we explore the possibility that ’oumuamua-like isas are produced in tidal disruption events (tdes) of refractory plan... | 1i/2017 ’oumuamua-like interstellar asteroids as possible messengers from dead stars |
the formation of cold gas giants similar to jupiter and saturn in orbit and mass is a great challenge for planetesimal-driven core accretion models because the core growth rates far from the star are low. here we model the growth and migration of single protoplanets that accrete planetesimals and gas. we integrated the... | exploring the conditions for forming cold gas giants through planetesimal accretion |
context. debris discs are a consequence of the planet formation process and constitute the fingerprints of planetesimal systems. their counterparts in the solar system are the asteroid and edgeworth-kuiper belts.aims: the aim of this paper is to provide robust numbers for the incidence of debris discs around fgk stars ... | incidence of debris discs around fgk stars in the solar neighbourhood |
land surface temperature (lst) is a vital physical parameter of earth surface system. estimating high-resolution lst precisely is essential to understand heat change processes in urban environments. existing lst products with coarse spatial resolution retrieved from satellite-based thermal infrared imagery have limited... | downscaling aster land surface temperature over urban areas with machine learning-based area-to-point regression kriging |
deflecting potentially dangerous asteroids may not be an easy task due to the complexity of the system, as well as challenges such as monitoring and defining their future orbit, which can often be very sensitive to encounters with massive planets. over the years, many proposals have been made to face the challenges and... | studying the prevention of collision of asteroid apophis with earth by kinetic impact |
milani is a 6u cubesat that will be released in the didymos binary asteroid system by esa's hera spacecraft. its objectives are to study and characterize the system's asteroids, thus demonstrating the use of miniaturized technologies for asteroid science. milani adopts sophisticated vision-based technologies for the gu... | the vision-based guidance, navigation, and control system of hera's milani cubesat |
we consider a simplified model to study some types of elongated asteroids with three protuberances, two at the ends and one in the middle. an example considered in this work is the asteroid holiday. to model these bodies, we consider a tripolar system with a segment, which consists of a massive segment and three sphere... | analysis of symmetric periodic orbits in a tripolar system with a segment |
part v of the evolutionary system of mineralogy explores phases produced by aqueous alteration, metasomatism, and/or thermal metamorphism—relicts of ancient processes that affected virtually all asteroids and that are preserved in the secondary mineralogy of meteorites. we catalog 166 historical natural kinds of minera... | an evolutionary system of mineralogy, part v: aqueous and thermal alteration of planetesimals ( 4565 to 4550 ma) |
this study aims to investigate the location and stability of equilibrium points in the potential field of the the asteroid (87) sylvia. the potential series expansion method is used, which involves decomposing the asteroid into homogeneous tetrahedral elements with a constant rotation speed. the results are compared wi... | the potential series expansion method: application to the asteroid (87) sylvia |
mining asteroids will soon be a reality; the technology for this venture is almost off the shelf depending on the development of artificial intelligence for autonomous robotic spacecraft. in this work, we treat the problem of transporting ores to earth, mainly to the vicinity of the moon to avoid any accident of a coll... | trajectories for mining space mission on asteroids in near-earth orbit |
chondrites are fragments of asteroids that avoided melting and, thus, provide a record of the material that accreted to form protoplanets. the dominant constituent of chondrites are millimeter-sized chondrules formed by transient heating events in the protoplanetary disk. some chondritic components, including chondrule... | combined u-corrected pb-pb dating and 26al-26mg systematics of individual chondrules - evidence for a reduced initial abundance of 26al amongst inner solar system chondrules |
it is in the interest of astronomy and engineering to find orbits for spacecraft that allow a good observation of the orbited body and, at the same time, to reduce expenses with fuel consumption for correction and maintenance maneuvers. considering the current scenario, many of the small bodies in the solar system have... | searching for orbits to observe iapetus |
this work proposes a numerical investigation for periodic orbits in the restricted three-body problem to observe the smaller primary of the system. periodic orbits are very important for observation missions, because they do not need station-keeping maneuvers and allow predicted passages by the main bodies. so, they al... | periodic orbits in the restricted three-body problem for observations of the smaller primary |
the assessment of flash flood hazards in the coastal zone of ras ghareb city (rgc), red sea, egypt, was accomplished through the use of gis tools and the spatial multi-criteria approach. the presented work aims to assess, integrate, and generate potential flash flood hazard maps. the analytic hierarchy process was util... | flash flooding hazard assessment, modeling, and management in the coastal zone of ras ghareb city, gulf of suez, egypt |
the world's meteorite collections contain a very rich picture of what the early solar system would have been made of, however the lack of spatial context with respect to their parent population for these samples is an issue. the asteroid population is equally as rich in surface mineralogies, and mapping these two popul... | a global fireball observatory |
the mascot radiometer mara is a multi-spectral instrument which measures net radiative flux in six wavelength bands. mara uses thermopile sensors as sensing elements, and the net flux between the instrument and the surface in the 18° field of view is determined by evaluating the thermoelectric potential between the sen... | the mascot radiometer mara for the hayabusa 2 mission |
nirs3: the near infrared spectrometer is installed on the hayabusa2 spacecraft to observe the target c-type asteroid 162173 ryugu at near infrared wavelengths of 1.8 to 3.2 μm. it aims to obtain reflectance spectra in order to detect absorption bands of hydrated and hydroxide minerals in the 3 μm-band. we adopted a lin... | nirs3: the near infrared spectrometer on hayabusa2 |
focused on asteroid soft-landing mission scenario, this paper investigates the methods of online gravity field modeling and trajectory optimization. since the gravity field near asteroids and its surface topography are irregular, accurate asteroid soft-landing can be a challenging problem to solve, especially in the ca... | a framework of gravity field online modeling and trajectory optimization in asteroid soft-landing mission scenarios |
this paper presents the low-thrust (lt) trajectory design for near-earth asteroid (nea) supply delivery and resource transportation mission using high-power solar electric propulsion (sep). nea low-thrust roundtrip accessibility is investigated through a numerical approach and new knowledge of the mass transportation c... | low-thrust trajectory design for near-earth asteroid supply delivery and resource transportation mission using high-power solar electric propulsion |
the terminal tracking camera system (ttcam) on the nasa lucy trojan asteroid discovery mission consists of a pair of block redundant cameras and their associated electronics that are mounted on the spacecraft's instrument pointing platform and co-boresighted with the rest of the mission's science payload instruments. t... | the terminal tracking camera system on the nasa lucy trojan asteroid discovery mission |
context. the movis catalog contains the largest set of near-infrared (nir) colors for solar system objects. these data were obtained from the observations performed by vista-vhs survey using the y, j, h, and ks filters. the taxonomic classification of objects in this catalog allows us to obtain large-scale distribution... | taxonomic classification of asteroids based on movis near-infrared colors |
this paper presents a comprehensive review of the science and technology of accessing near-earth asteroids (neas), or making them accessible, for obtaining both information and resources. the survey is divided into four major groups of nea study, namely a) discovery (population estimation and detection), b) exploration... | asteroid engineering: the state-of-the-art of near-earth asteroids science and technology |
primordial black holes (pbhs) remain a viable dark matter candidate in the asteroid-mass range. we point out that in this scenario, the pbh abundance would be large enough for at least one object to cross through the inner solar system per decade. since solar system ephemerides are modeled and measured to extremely hig... | close encounters of the primordial kind: a new observable for primordial black holes as dark matter |
eclipsing post-common-envelope binaries are highly important for resolving the poorly understood, very short-lived common-envelope phase of stellar evolution. most hot subdwarfs (sdo/bs) are the bare helium-burning cores of red giants that have lost almost all of their hydrogen envelope. this mass loss is often trigger... | the erebos project: investigating the effect of substellar and low-mass stellar companions on late stellar evolution. survey, target selection, and atmospheric parameters |
the lucy mission accomplishes its science during a series of five flyby encounters with seven trojan asteroid targets. this mission architecture drives a concept of operations design that maximizes science return, provides redundancy in observations where possible, features autonomous fault protection, and utilizes onb... | lucy mission to the trojan asteroids: instrumentation and encounter concept of operations |
reproducing the large earth/mars mass ratio requires a strong mass depletion in solids within the protoplanetary disc between 1 and 3 au. the grand tack model invokes a specific migration history of the giant planets to remove most of the mass initially beyond 1 au and to dynamically excite the asteroid belt. however, ... | terrestrial planet formation constrained by mars and the structure of the asteroid belt |
we report observations of the didymos-dimorphos binary asteroid system using the atacama large millimeter/submillimeter array (alma) and the atacama compact array (aca) in support of the double asteroid redirection test mission. our observations on ut 2022 september 15 provided a preimpact baseline and the first measur... | alma observations of the dart impact: characterizing the ejecta at submillimeter wavelengths |
the asteroid 99942 apophis is a near earth asteroid, which was just recently removed from the potentially hazardous asteroids list, since there is no risk of collision with the earth for the next 100 years. although, its importance to dynamical astronomy remains evidenced due to other further close encounters that will... | the dynamical structure of a hypothetical disc of particles around the asteroid 99942 apophis |
hawking proposed that the sun may harbor a primordial black hole (bh) whose accretion supplies some of the solar luminosity. such an object would have formed within the first 1 s after the big bang with the mass of a moon or an asteroid. these light bhs are a candidate solution to the dark matter problem, and could gro... | solar evolution models with a central black hole |
the nasa double asteroid redirection test (dart) spacecraft will impact the secondary member of the [65803] didymos binary in order to perform the first demonstration of asteroid deflection by kinetic impact. determination of the momentum transfer to the target body from the kinetic impact is a primary planetary defens... | dart mission determination of momentum transfer: model of ejecta plume observations |
context. the recent estimates of the 3d shape of the m/xe-type triple asteroid system (216) kleopatra indicated a density of ~5 g cm−3, which is by far the highest for a small solar system body. such a high density implies a high metal content as well as a low porosity which is not easy to reconcile with its peculiar "... | (216) kleopatra, a low density critically rotating m-type asteroid |
in our solar system, spin-orbit resonances are common under sun--planet, planet--satellite and binary asteroid configurations. in this work, high-order and secondary spin-orbit resonances are investigated by taking numerical and analytical approaches. poincaré sections as well as two types of dynamical maps are produce... | dynamical structures associated with high-order and secondary resonances in the spin-orbit problem |
we report a statistically significant detection of nongravitational acceleration on the subkilometer near-earth asteroid (523599) 2003 rm. due to its orbit, 2003 rm experiences favorable observing apparitions every 5 yr. thus, since its discovery, 2003 rm has been extensively tracked with ground-based optical facilitie... | (523599) 2003 rm: the asteroid that wanted to be a comet |
current gravitational-wave observations set the most stringent bounds on the abundance of primordial black holes (pbhs) in the solar mass range. this constraint, however, inherently relies on the merger rate predicted by pbh models. previous analyses have focused mainly on two binary formation mechanisms: early univers... | primordial black hole mergers from three-body interactions |
we report statistically significant detections of nonradial, nongravitational accelerations based on astrometric data in the photometrically inactive objects 1998 ky26, 2005 vl1, 2016 nj33, 2010 vl65, 2016 rh120, and 2010 rf12. the magnitudes of the nongravitational accelerations are greater than those typically induce... | dark comets? unexpectedly large nongravitational accelerations on a sample of small asteroids |
nasa's lucy mission spacecraft was launched on 16 october 2021 and will perform the initial in situ investigation of the jovian trojan asteroids (levison et al. 2021, 2024). the lucy long range reconnaissance imager (l'lorri) is a panchromatic visible light (420-795 nm, 50% qe points), narrow-angle (field of view = 0.2... | the lucy long range reconnaissance imager (l'lorri) |
mars is the next planet from the sun after earth. the minimum distance between the planets, due to the significant eccentricity of the orbit, in opposition varies from 55 to 101 million km. on the surface of mars, light continents, dark seas and very light polar caps are observed in the polar regions. the rotation of m... | history of possible climate change on mars |
we present preliminary diameters and albedos for 7956 asteroids detected in the first year of the neowise reactivation mission. of those, 201 are near-earth asteroids and 7755 are main belt or mars-crossing asteroids. 17% of these objects have not been previously characterized using the near-earth object wide-field inf... | neowise reactivation mission year one: preliminary asteroid diameters and albedos |
this report summarizes observations of returned apollo rocks and soils, lunar surface images, orbital observations, and experimental impacts related to the erosion and comminution of rocks exposed at the lunar surface. the objective is to develop rigorous criteria for the recognition of impact processes that assist in ... | erosion of lunar surface rocks by impact processes: a synthesis |
we performed pulse-laser irradiation experiments of a primitive meteorite to simulate space weathering by micrometeorite bombardments on c-type asteroids. pellets of powdered murchison cm2 chondrite were set in vacuum and exposed to pulse laser with a diameter of 0.5 mm and delivered energies of 5, 10, and 15 mj. we me... | pulse-laser irradiation experiments of murchison cm2 chondrite for reproducing space weathering on c-type asteroids |
context. planets orbiting low-mass stars such as m dwarfs are now considered a cornerstone in the search for planets with the potential to harbour life. gj 273 is a planetary system orbiting an m dwarf only 3.75 pc away, which is composed of two confirmed planets, gj 273b and gj 273c, and two promising candidates, gj 2... | gj 273: on the formation, dynamical evolution, and habitability of a planetary system hosted by an m dwarf at 3.75 parsec |
here, primordial black holes (pbhs) creation from exponential potential has been inquired, through gravitationally raised friction emanated from the nonminimal coupling between gravity and field derivative setup. setting a two-parted exponential function of inflaton field as coupling parameter, and fine-tuning of four ... | primordial black holes ensued from exponential potential and coupling parameter in nonminimal derivative inflation model |
nasa's double asteroid redirection test (dart) mission intentionally impacted the asteroid dimorphos on september 26, 2022, and this kinetic impact changed dimorphos' orbit around its binary companion didymos. this first planetary defense test explored technological readiness for this method of asteroid deflection. | planetary defense with the double asteroid redirection test (dart) mission and prospects |
the osiris-rex mission collected a sample from the surface of the asteroid (101955) bennu in 2020 october. here, we study the impact of the osiris-rex touch-and-go sampling acquisition mechanism (tagsam) interacting with the surface of an asteroid in the framework of granular physics. traditional approaches to estimati... | modified granular impact force laws for the osiris-rex touchdown on the surface of asteroid (101955) bennu |
context. on september 26, 2022, the nasa dart mission impacted the asteroid dimorphos, the smaller component of the didymos binary asteroid system. this provided a unique opportunity to observe, in real time, the evolution of the ejecta cloud produced by the impact and the formation of a tail.aims: we present observati... | morphology and spectral properties of the dart impact ejecta with vlt/muse |
we present here the decam ecliptic exploration project (deep), a three year noao/noirlab survey that was allocated 46.5 nights to discover and measure the properties of thousands of trans-neptunian objects (tnos) to magnitudes as faint as vr~27, corresponding to sizes as small as 20 km diameter. in this paper we presen... | the decam ecliptic exploration project (deep): i. survey description, science questions, and technical demonstration |
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