G. Dudziński
A5090968998- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Geological and Geochemical Analysis
- Gamma-ray bursts and supernovae
- Geomagnetism and Paleomagnetism Studies
- Space Exploration and Technology
- Calibration and Measurement Techniques
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Solar and Space Plasma Dynamics
- Technology Assessment and Management
- Scientific Research and Discoveries
- Autopsy Techniques and Outcomes
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Advanced Research in Science and Engineering
- Radioactive Decay and Measurement Techniques
- Atmospheric Ozone and Climate
- Opportunistic and Delay-Tolerant Networks
Adam Mickiewicz University in Poznań
2014-2022
Astronomical Observatory
2019-2022
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...
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...
Context. Over the past decades, several interplanetary missions have studied small bodies in situ, leading to major advances our understanding of their geological and geophysical properties. These missions, however, had a limited number targets. Among them, NASA Dawn mission has characterised detail topography albedo variegation across surface asteroid (4) Vesta down spatial resolution ~20 m pixel −1 scale. Aims. Here aim was determine how much topographic information can be retrieved from...
Context. Asteroid (16) Psyche is the largest M-type asteroid in main belt and target of NASA mission. It also only this size ( D > 200 km) known to be metal rich. Although various hypotheses have been proposed explain rather unique physical properties asteroid, a perfect understanding its formation bulk composition still missing. Aims. We aim refine shape density perform thorough analysis better constrain possible scenarios structure interior. Methods. obtained disk-resolved...
Context. The available set of spin and shape modelled asteroids is strongly biased against slowly rotating targets those with low lightcurve amplitudes. This due to the observing selection effects. As a consequence, current picture asteroid axis distribution, rotation rates, radiometric properties, or aspects related object’s internal structure might be affected too. Aims. To counteract these effects, we are running photometric campaign large sample main belt omitted in most previous...
Context. The recent estimates of the 3D shape M/Xe-type triple asteroid system (216) Kleopatra indicated a density 5 g.cm$^{-3}$. Such high implies metal content and low porosity which is not easy to reconcile with its peculiar dumbbell shape. Aims. Given unprecedented angular resolution VLT/SPHERE/ZIMPOL camera, we aim constrain mass accuracy, hence density. Methods. We combined our new VLT/SPHERE observations recorded in 2017 2018 archival data, as well lightcurve, occultation,...
Asteroid (31) Euphrosyne is one of the biggest objects in asteroid main belt and family occupies a highly inclined region outer contains remarkably large number members, which interpreted as an outcome disruptive cratering event. The goals this adaptive-optics imaging study were threefold: to characterize shape Euphrosyne, constrain its density, search for craters that may be associated with formation We obtained disk-resolved images using SPHERE/ZIMPOL at ESO's 8.2-m VLT part our program...
Dynamical models of Solar System evolution have suggested that P-/D-type volatile-rich asteroids formed in the outer and may be genetically related to Jupiter Trojans, comets small KBOs. Indeed, their spectral properties resemble anhydrous cometary dust. High-angular-resolution images P-type asteroid (87) Sylvia with VLT/SPHERE were used reconstruct its 3D shape, study dynamics two satellites. We also model Sylvia's thermal evolution. The shape appears flattened elongated. derive a...
The near-Earth asteroid 3200 Phaethon (1983 TB) is an attractive object not only from a scientific viewpoint but also because of JAXA's DESTINY+ target. rotational lightcurve and spin properties were investigated based on the data obtained in ground-based observation campaign Phaethon. We aim to refine lightcurves shape model using all available datasets via optical observation, as well our time-series 2017 apparition. Using eight 1-2-m telescopes imager, we acquired derived parameters...
In this work, we present SAGE (shaping asteroid models using genetic evolution), an modelling algorithm based solely on photometric lightcurve data. It produces non-convex shapes, orientations of the rotation axes and rotational periods asteroids. The main concept behind a evolution is to produce random populations shapes spin-axis by mutating seed shape iterating process until it converges stable global minimum. We tested five artificial shapes. also modelled asteroids 433 Eros 9 Metis,...
On 28th January 2018, the large Trans-Neptunian Object (TNO) 2002TC302 occulted a m$_v= $15.3 star with ID 130957813463146112 in Gaia DR2 stellar catalog. 12 positive occultation chords were obtained from Italy, France, Slovenia and Switzerland. Also, 4 negative detections near north south limbs. This represents best observed by TNO other than Pluto, terms of number published thus far. From chords, an accurate elliptical fit to instantaneous projection body, compatible misses, can be...
Non-resolved thermal infrared observations enable studies of and physical properties asteroids via thermo-physical models provided the shape rotational target are well determined. We used calibration-programme Herschel PACS data (70, 100, 160 μ m) state-of-the-art derived from adaptive-optics and/or optical light curves to constrain for first time inertia twelve large main-belt asteroids. also modelled previously well-characterised targets such as (1) Ceres or (4) Vesta they constitute...
To interpret adaptive-optics observations of (216) Kleopatra, we need to describe an evolution multiple moons, orbiting extremely irregular body and including their mutual interactions. Such orbits are generally non-Keplerian orbital elements not constants. Consequently, use a modified $N$-body integrator, which was significantly extended include the multipole expansion gravitational field up order $\ell = 10$. Its convergence verified against `brute-force' algorithm. We computed...
Context. Asteroid (22) Kalliope is the second largest M-type asteroid in main belt and orbited by a satellite, Linus. Whereas mass of already well constrained thanks to presence moon, its volume still poorly known, leading uncertainties on bulk density internal structure. Aims. We aim refine shape thus diameter density, as orbit moon better constrain mass, hence Methods. acquired disk-resolved observations using VLT/SPHERE/ZIMPOL instrument reconstruct three-dimensional (3D) three different...
We present a new non-convex model of the 90 Antiope binary asteroid, derived with modified version Shaping Asteroids Genetic Evolution (SAGE) method using disc-integrated photometry only. A variant SAGE algorithm capable deriving models systems is described. The confirms system's pole solution (λ = 199°, β 38°, σ ±5°) and orbital period (16.505 046 ± 0.000 005 h). comparison between stellar occultation chords obtained during 2011 projected shape has been used to scale model. resulting scaled...
The need for more accurate asteroid models is perhaps secondary to the measure their quality. uncertainties of models’ parameters propagate quantities like volume or density – most important and informative properties asteroids affecting conclusions about physical nature. Our knowledge on shapes spins small Solar system bodies comes mostly from visual, disc-integrated photometry. In this work we present a method model uncertainty assessment based visual photometry (light curves...
ABSTRACT Since 2005 December, recurrent outbursts have been observed for Centaur 174/P Echeclus, confirming it is an active object. Thanks to a large number of photometric data obtained between 2001 April and 2019 we were able compute shape model this We obtain sidereal rotation period P = 26.785178 ± 10−6 h six equally probable pole solutions, each with obliquity the rotational axis (50° or more). also find object significantly elongated, semi-major axial ratio a/b 1.32 (and b/c ∼ 1.1 but...
Asteroid (7) Iris is an ideal target for disk-resolved imaging owing to its brightness (V$\sim$7-8) and large angular size of 0.33 arcsec during apparitions. believed belong the category unfragmented asteroids that avoided internal differentiation, implying current shape topography may record first few 100 Myr solar system's collisional evolution. We recovered information about surface from VLT/SPHERE/ZIMPOL images acquired in frame our ESO program. used All-Data Modeling (ADAM)...
Context. With an estimated diameter in the 320–350 km range, (704) Interamnia is fifth largest main belt asteroid and one of few bodies that fills gap size between four with D > 400 (Ceres, Vesta, Pallas Hygiea) numerous smaller ≤200 km. However, despite its large size, little known about shape spin state and, therefore, bulk composition past collisional evolution. Aims. We aimed to test at what mass a small body departs from nearly ellipsoidal equilibrium (as observed case asteroids)...
Context. Thanks to the Gaia mission, it will be possible determine masses of approximately hundreds large main belt asteroids with very good precision. We currently have diameter estimates for all them that can used compute their volume and hence density. However, some those diameters are still based on simple thermal models, which occasionally lead uncertainties as high 20–30%. Aims. The aim this paper is 3D shape models volumes 13 were selected from targets provide mass an accuracy better...