Agata Rożek
A5021531078- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Geomagnetism and Paleomagnetism Studies
- High-pressure geophysics and materials
- Astrophysics and Star Formation Studies
- Geological and Geochemical Analysis
- Astronomical and nuclear sciences
- Space Satellite Systems and Control
- Spacecraft and Cryogenic Technologies
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Space Exploration and Technology
- Atmospheric and Environmental Gas Dynamics
- Chemical Thermodynamics and Molecular Structure
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Magnetic confinement fusion research
- Distributed systems and fault tolerance
- Scientific Research and Discoveries
- Laser-Plasma Interactions and Diagnostics
Royal Observatory
2021-2025
University of Edinburgh
2020-2025
UK Astronomy Technology Centre
2020-2024
University of Kent
2013-2023
AGH University of Krakow
2023
University of Padua
2015-2016
Adam Mickiewicz University in Poznań
2009-2014
Abstract The Double Asteroid Redirection Test (DART) spacecraft successfully performed the first test of a kinetic impactor for asteroid deflection by impacting Dimorphos, secondary near-Earth binary (65803) Didymos, and changing orbital period Dimorphos. A change in approximately 7 min was expected if incident momentum from DART directly transferred to target perfectly inelastic collision 1 , but studies probable impact conditions properties indicated that considerable enhancement ( β )...
Aims. Approach observations with the Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) experiment onboard Rosetta are used to determine rotation period, direction of spin axis, state comet 67P's nucleus.
Abstract On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, satellite of binary near-Earth asteroid (65803) Didymos. This demonstrated efficacy a kinetic impactor for planetary defense by changing orbital period Dimorphos 33 minutes. Measuring change relied heavily on coordinated campaign lightcurve photometry designed to detect mutual events (occultations and eclipses) as direct probe satellite’s period. A total 28 telescopes contributed 224...
Context. During the most recent perihelion passage in 2009 of comet 67P/Churyumov-Gerasimenko (67P), ground-based observations showed an anisotropic dust coma where jet-like features were detected at ~ 1.3 AU from Sun. The current is exceptional as Rosetta spacecraft monitoring nucleus activity since March 2014, when a clear was already surrounding 4.3 Subsequently, OSIRIS camera also witnessed outburst between April 27 and 30, mid-July, rh 3.7−3.6 preperihelion clearly non-isotropic,...
<title>Abstract</title> Understanding the physical characteristics of small bodies in Solar System is crucial for refining models their formation and evolution. Although several kilometre-sized asteroids have already been visited by spacecraft, 1998 KY26 will be first asteroid decametre range to explored situ. Its diameter spin period place it above barrier, suggesting that its properties may differ from those previously bodies. However, key remain poorly understood. We conducted a...
Abstract Contact binaries are found throughout the solar system. The recent discovery of Selam, satellite MBA (152830) Dinkinesh, by NASA LUCY mission has made it clear that term ‘contact binary’ covers a variety different types bi-modal mass distributions and formation mechanisms. Only modelling more contact can this population be properly understood. We determined spin state shape model for Apollo group binary asteroid (388188) 2006 DP14using ground-based optical radar observations...
Aims. The OSIRIS camera onboard the Rosetta spacecraft obtained close-up views of dust coma comet 67P. jet structures can be used to trace their source regions and examine possible effect gas-surface interaction.
We analyze the physical properties and dynamical origin of a curved jet comet 67P/Churyumov-Gerasimenko that was observed repeatedly in several nucleus rotations starting on May 30 persisting until early August, 2015. simulated motion dust grains ejected from surface under influence gravity viscous drag effect expanding gas flow rotating nucleus. The formation is combination size particles (~0.1-1 mm) location source region near equator. This enhances spiral feature collimated stream after...
Abstract The impact of the Double Asteroid Redirection Test spacecraft into Dimorphos, moon asteroid Didymos, changed Dimorphos’s orbit substantially, largely from ejection material. We present results 12 Earth-based facilities involved in a world-wide campaign to monitor brightness and morphology ejecta first 35 days after impact. After an initial brightening ∼1.4 mag, we find consistent dimming rates 0.11–0.12 mag day −1 week, 0.08–0.09 over entire study period. system returned its...
Abstract The NASA’s Double-Asteroid Redirection Test (DART) was a unique planetary defence and technology test mission, the first of its kind. main spacecraft DART mission impacted target asteroid Dimorphos, small moon orbiting Didymos (65803), on 2022 September 26. impact brought up mass ejecta which, together with direct momentum transfer from collision, caused an orbital period change 33 ± 1 minutes, as measured by ground-based observations. We report here outcome optical monitoring...
We have acquired simultaneous high-precision space photometry and radial velocities of the bright hybrid β Cep/Slowly Pulsating B pulsator γ Peg. Frequency analyses reveal presence six gravity (g) modes high order together with eight low-order Cep oscillations in both data sets. Mode identification shows that all pulsations spherical degrees ℓ = 0–2. An 8.5 M☉ model reproduces observed pulsation frequencies; theoretically predicted domain are detected. suggest, contrary to previous authors,...
As the ESA Rosetta mission approached, orbited, and sent a lander to comet 67P/Churyumov-Gerasimenko in 2014, large campaign of ground-based observations also followed comet. We constrain total activity level by photometry spectroscopy place results context understand large-scale structure comet's coma pre-perihelion. performed using number telescopes, but concentrate on from 8m VLT Gemini South telescopes Chile. use R-band imaging measure dust contribution brightness UV-visible search for...
Abstract The world’s first planetary defense test mission was carried out in late 2022 by NASA’s Double Asteroid Redirection Test (DART) mission. main DART spacecraft, which accompanied the ASI-provided LICIACube cubesat, intentionally impacted Dimorphos, smaller secondary of near-Earth object binary system (65803) Didymos, on September 26. impact released a large amount ejecta, which, combined with spacecraft’s momentum, produced observed 33 ± 1 minute period change that subsequently from...
The paper expands the idea of Vokrouhlický and Nesvorný who used a modified Zappalà et al. metric with osculating elements in search for pairs asteroids suspected having common origin. Using six different orbital similarity functions, we find that five them display similar excess close catalogue elements. is even higher when mean are used. Similarly, applied, there better agreement between closest found same using metrics. subset 62 from lists 100 according to distance functions provided....
Abstract We report radar, photometric, and visible-wavelength spectrophotometry observations of NEA 2018 EB obtained in 2018. The radar campaign started at Goldstone (8560 MHz, 3.5 cm) on April 7, it was followed by more extensive from October 5 to 9 both Arecibo (2380 12.6 Goldstone. observed optically 5, 8, again 18. Spectrophotometry 19 with the SOAR telescope, data suggest that is an Xk-class object. echo power spectra delay-Doppler images revealed a binary system. Radar constrained...
V440 Per is a Population I Cepheid with the period of 7.57 day and low amplitude, almost sinusoidal light radial velocity curves. With no reliable data on 1st harmonic, its pulsation mode identification remained controversial. We obtained curve our new high precision throughput Poznan Spectroscopic Telescope. Our reach accuracy 130 m/s per individual measurement yield secure detection harmonic amplitude A_2= 140+/- 15 m/s. The Fourier phase \phi_21 inconsistent at 7.25 \sigma level those...
A compact formula for the stress tensor inside a self-gravitating, triaxial ellipsoid in an arbitrary rotation state is given. It contains no singularity incompressible medium limit. The and quality factor model are used to derive solution energy dissipation resulting damping (short axis mode) or excitation (long axis) of wobbling. In limit revolution, we compare our with earlier ones show that, appropriate corrections, differences times estimates much smaller than it has been claimed. This...
A semi-analytical model of the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect on an asteroid spin in a non-principal axis rotation state is developed.The describes spin-state evolution Deprit-Elipe variables, first-order averaged with respect to and Keplerian orbital motion.Assuming zero conductivity, YORP torque represented by spherical harmonic series vectorial coefficients, allowing us use any degree order approximation.Within quadrupole approximation illumination function we find...
Context . The rotation state of small asteroids is affected in the long term by perturbing torques gravitational and radiative origin (the YORP effect). former can be detected a change spin-axis orientation inertial space; latter manifests itself quadratic increase phase. Aims Direct observational evidence effect primary goal our work. This includes both detection for new objects an improvement accuracy previously known detections. Methods We carried out photometric observations five...
The YORP effect is a small thermal-radiation torque experienced by asteroids, and considered to be crucial in their physical dynamical evolution. It important understand this providing measurements of for range asteroid types facilitate the development theoretical framework. We are conducting long-term observational study on selection near-Earth asteroids support this. focus here (68346) 2001 KZ66, which we obtained both optical radar observations spanning decade. This allowed us perform...
Context. Comets are believed to hold a relatively pristine record of the physical and chemical processes that occurred during formation evolution solar system. Thorough investigations these small bodies, such as one will be performed by ESA/Rosetta cornerstone mission, thus supposed bring strong unique constraints on origins
We present new results of the observing program which is a part NEOROCKS project aimed to improve knowledge on physical properties near-Earth Objects (NEOs) for planetary defense. Photometric observations were performed using 1.2m telescope at Haute-Provence observatory (France) in BVRI filters Johnson-Cousins photometric systems between June 2021 and April 2022. obtained surface colors 42 NEOs. Based measured we classified 20 objects as S-complex, 9 C-complex, X-complex, 2 D-type, one...
Main Belt Comets (MBCs) exhibit sublimation-driven activity while occupying asteroid-like orbits in the Asteroid Belt. MBCs and candidates show stronger clustering of their longitudes perihelion around 15{\deg} than other objects from Outer (OMB). This potential property could facilitate discovery new by observing similar orbits. We acquired deep r-band images 534 targeted asteroids using INT/WFC between 2018 2020. Our sample is comprised OMB observed near perihelion, with 0{\deg} 30{\deg}...
Context. The potentially hazardous asteroid (85990) 1999 JV6 has been a target of previously published thermal-infrared observations and optical photometry. It identified as promising candidate for possible Yarkovsky-O’Keefe-Radzievskii-Paddack (YORP) effect detection. Aims. YORP is small thermal-radiation torque considered to be key factor in spin-state evolution Solar System bodies. In order detect on we developed detailed shape model analysed the using both radar observations. Methods....
Abstract Harmon et al. Arecibo radar observations from 1992 provided some of the most precise line-of-sight distance (ranging) measurements Ganymede and Callisto to date. We report 18 new ranges obtained at 1999 2016, among which are first Io Europa. also accompanying velocity (Doppler frequency) measurements. In 2015, we detected Europa, Ganymede, with time-delay (range) resolutions as fine 10 μ s (1.5 km) while was 70 (10.5 resolution. estimated residuals for respect latest JPL satellite...