A5019450930- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Astronomical Observations and Instrumentation
- High-pressure geophysics and materials
- Geomagnetism and Paleomagnetism Studies
- Gamma-ray bursts and supernovae
- Space Exploration and Technology
- Space Satellite Systems and Control
- Solar and Space Plasma Dynamics
- Spacecraft and Cryogenic Technologies
- Astronomical and nuclear sciences
- Adaptive optics and wavefront sensing
- Geological Formations and Processes Exploration
- Advanced Mathematical Identities
- Structural Health Monitoring Techniques
- Eastern European Communism and Reforms
- Fluid Dynamics Simulations and Interactions
- Geochemistry and Elemental Analysis
- Molecular Spectroscopy and Structure
Charles University
2015-2024
Czech Academy of Sciences, Astronomical Institute
2012-2024
Astronomical Institute of the Slovak Academy of Sciences
2015
Institute of Astronomy
2015
Karlovac University of Applied Sciences
2013
Context. In the past decade, more than one hundred asteroid models were derived using lightcurve inversion method. Measured by number of models, has become leading method for shape determination.
Context. Until recently, the 3D shape, and therefore density (when combining volume estimate with available mass estimates), surface topography of vast majority largest ( D ≥ 100 km) main-belt asteroids have remained poorly constrained. The improved capabilities SPHERE/ZIMPOL instrument opened new doors into ground-based asteroid exploration. Aims. To constrain formation evolution a representative sample large asteroids, we conducted high-angular-resolution imaging survey 42...
Abstract Near-Earth Objects (NEOs) are a transient population of small bodies with orbits near or in the terrestrial planet region. They represent mid-stage dynamical cycle asteroids and comets, which starts their removal from respective source regions—the main belt trans-Neptunian scattered disk—and ends as impact planets, disintegrate Sun, ejected solar system. Here we develop new orbital model NEOs by numerically integrating asteroid main-belt sources calibrating results on observations...
Context . The source regions of ordinary chondrites (~80% all falls) and large S-type near-Earth objects (NEOs; ~30%) have recently been identified with three young asteroid families (Karin, Koronis, Massalia) being at the origin most chondrite falls. Aims present work is a continuation our previous studies aims to determine remaining meteorite NEO classes, an emphasis on carbonaceous (CM, CI, CO, CV, CK, CR, CH, CB, or C-ungrouped). Methods We studied 38 individual families, including old...
The orbital distributions of prominent asteroid families are thought to be direct by-products catastrophic disruption events among diameter D greater, similar 100 kilometer bodies. Ejection velocities derived from studying observed families, however, surprisingly high compared with results impact experiments and simulations. One way resolve this apparent contradiction is by assuming that less, 20 family members, since their formation, have undergone semimajor axis drift the thermal force...
In the Nice model, late heavy bombardment (LHB) is related to an orbital instability of giant planets which causes a fast dynamical dispersion transneptunian cometary disk. We study effects produced by these hypothetical projectiles on main-belt asteroids. particular, we want check whether observed collisional families provide lower or upper limit for flux during LHB. present updated list asteroid as identified in space synthetic proper elements hierarchical clustering method, colour data,...
Context: Planetary embryos can continue to grow by pebble accretion until they become giant planet cores. Simultaneously, these mutually interact and also migrate due torques arising from the protoplanetary disk. Aims: Our aim is investigate how alters orbital evolution of undergoing Type-I migration. In particular, we study whether establish resonant chains, chains are prone instabilities if cores form through embryo merging, thus occurring more rapidly than alone. Methods: For first time,...
The larger number of models asteroid shapes and their rotational states derived by the lightcurve inversion give us better insight into both nature individual objects whole population. With a statistical sample we can study physical properties populations, such as main-belt asteroids or families, in more detail. Shape also be used combination with other types observational data (IR, adaptive optics images, stellar occultations), e.g., to determine sizes thermal properties. We use all...
Asteroids residing in the first-order mean motion resonances with Jupiter hold important information about processes that set final architecture of giant planets. Here, we revise current populations objects J2/1 (Hecuba-gap group), J3/2 (Hilda group) and J4/3 (Thule resonances. The number multi-opposition asteroids found is 274 for J2/1, 1197 three J4/3. By discovering a second third object resonance (186024) 2001 QG207 (185290) 2006 UB219, this population becomes real group rather than...
Abstract We outline the impact of a small two-band UV-photometry satellite mission on field stellar physics, magnetospheres stars, binaries, clusters, interstellar matter, and exoplanets. On specific examples different types stars systems, we discuss particular requirements for such in terms parameters as bandpass, precision, cadence, duration. show that may provide crucial data not only hot emit most their light UV, but also cool where UV traces activity. This is important, instance,...
Abstract The Hilda population of asteroids is located in a large orbital zone long-term stability associated with the Jupiter J3/2 mean-motion resonance. They are sister Trojans, since both them likely made up objects captured from primordial Kuiper Belt early solar system history. Comparisons between and physical properties Trojan populations thus represent test outer planet formation models. Here we use decade observations Catalina Sky Survey (G96 site) to determine bias-corrected...
We model the long-term evolution of Hilda collisional family located in 3/2 mean-motion resonance with Jupiter. Its eccentricity distribution evolves mostly due to Yarkovsky/YORP effect and assuming that (i) impact disruption was isotropic (ii) albedo small asteroids is same as for large ones, we can estimate age be 4+0−1 Gyr. also calculate activity J3/2 region. Our results indicate current rates are very low a 200-km parent body such number expected events over gigayears much smaller than 1.
Context. The vast majority of the geophysical and geological constraints (e.g., internal structure, cratering history) for main-belt asteroids have so far been obtained via dedicated interplanetary missions ESA Rosetta, NASA Dawn). high angular resolution SPHERE/ZIMPOL, new-generation visible adaptive-optics camera at ESO VLT, implies that these science objectives can now be investigated from ground a large fraction D ≥ 100 km asteroids. sharp images acquired by this instrument used to...