Özgür Karatekin
A5084946143- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Spacecraft and Cryogenic Technologies
- Geology and Paleoclimatology Research
- Space Satellite Systems and Control
- Spacecraft Design and Technology
- Atmospheric and Environmental Gas Dynamics
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Spaceflight effects on biology
- Calibration and Measurement Techniques
- Marine and environmental studies
- Gas Dynamics and Kinetic Theory
- High-pressure geophysics and materials
- Spacecraft Dynamics and Control
- Inertial Sensor and Navigation
- GNSS positioning and interference
- Atmospheric Ozone and Climate
- Isotope Analysis in Ecology
- Scientific Research and Discoveries
Royal Observatory of Belgium
2016-2025
Royal Belgian Institute for Space Aeronomy
2022-2024
Politecnico di Milano
2023
UCLouvain
2022
Institute of Astronomy
2021
KU Leuven
2021
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2019
Dynamic Research (United States)
2019
Agenzia Spaziale Italiana
2018
Observatoire de la Côte d’Azur
2017
Abstract Hera is a planetary defense mission under development in the Space Safety and Security Program of European Agency for launch 2024 October. It will rendezvous late 2026 December with binary asteroid (65803) Didymos particular its moon, Dimorphos, which be impacted by NASA’s DART spacecraft on 2022 September 26 as first deflection test. The main goals are detailed characterization physical properties Dimorphos crater made mission, well measurement momentum transfer efficiency...
Abstract NASA's Double Asteroid Redirection Test (DART) mission was the first to demonstrate asteroid deflection, and mission's Level 1 requirements guided its planetary defense investigations. Here, we summarize DART's achievement of those requirements. On 2022 September 26, DART spacecraft impacted Dimorphos, secondary member Didymos near-Earth binary system, demonstrating an autonomously navigated kinetic impact into with limited prior knowledge for defense. Months subsequent Earth-based...
Abstract Images collected during NASA’s Double Asteroid Redirection Test (DART) mission provide the first resolved views of Didymos binary asteroid system. These images reveal that primary asteroid, Didymos, is flattened and has plausible undulations along its equatorial perimeter. At high elevations, surface rough contains large boulders craters; at low elevations smooth possesses fewer craters. Didymos’ moon, Dimorphos, an intimate mixture boulders, several asteroid-wide lineaments, a...
Some unresolved problems related to Richardson extrapolation (RE) are elucidated via examples, and possible remedies suggested. The method is applied the case of turbulent flow past a backward facing step using nonuniform grid distributions. It demonstrated that RE can be used obtain independent solutions same refinement factors in both coordinate directions. use generalized wall functions together with standard k-ε model seems work well even if extends into viscous sublayer. In addition,...
Tidal interactions between Saturn and its satellites play a crucial role in both the orbital migration of heating their interiors. Therefore, constraining tidal dissipation (here ratio k2/Q) opens door to past evolution whole system. If Saturn's can be determined at different frequencies, it may also possible constrain giant planet's interior structure, which is still uncertain. Here, we try determine through current effect on orbits main moons, using astrometric data spanning more than...
The NOMAD ("Nadir and Occultation for MArs Discovery") spectrometer suite on board the ExoMars Trace Gas Orbiter (TGO) has been designed to investigate composition of Mars' atmosphere, with a particular focus trace gases, clouds dust. detection sensitivity gases is considerably improved compared previous Mars missions, compliant science objectives TGO mission. This will allow major leap in our knowledge understanding Martian atmospheric related physical chemical processes. instrument...
Abstract NASA’s Double Asteroid Redirection Test (DART) spacecraft is planned to impact the natural satellite of (65803) Didymos, Dimorphos, at around 23:14 UTC on 2022 September 26, causing a reduction in its orbital period that will be measurable with ground-based observations. This test kinetic impactor technology provide first estimate momentum transfer enhancement factor β realistic scale, wherein ejecta from an additional deflection target. Earth-based observations, LICIACube (to...
Abstract Improving and homogenizing time space reference systems on Earth and, more specifically, realizing the Terrestrial Reference Frame (TRF) with an accuracy of 1 mm a long-term stability 0.1 mm/year are relevant for many scientific societal endeavors. The knowledge TRF is fundamental navigation sciences. For instance, quantifying sea level change strongly depends accurate determination geocenter motion but also positions continental island stations, such as those located at tide...
Abstract The MAJIS (Moons And Jupiter Imaging Spectrometer) instrument on board the ESA JUICE (JUpiter ICy moon Explorer) mission is an imaging spectrometer operating in visible and near-infrared spectral range from 0.50 to 5.55 μm two channels with a boundary at 2.3 samplings for VISNIR IR better than 4 nm/band 7 nm/band, respectively. IFOV 150 μrad over total of 400 pixels. As already amply demonstrated by past present operative planetary space missions, this type can span wide scientific...
Abstract Asteroids smaller than 10 km are thought to be rubble piles formed from the reaccumulation of fragments produced in catastrophic disruption parent bodies. Ground-based observations reveal that some these asteroids today binary systems, which a secondary orbits larger primary asteroid. However, how became systems remains unclear. Here, we report analysis boulders on surface stony asteroid (65803) Didymos and its moonlet, Dimorphos, data collected by NASA DART mission. The...
Abstract Spacecraft observations revealed that rocks on carbonaceous asteroids, which constitute the most numerous class by composition, can develop millimeter-to-meter-scale fractures due to thermal stresses. However, signatures of this process second-most populous group S-complex, have been poorly constrained. Here, we report boulders’ Dimorphos, is moonlet S-complex asteroid (65803) Didymos, target NASA’s Double Asteroid Redirection Test (DART) planetary defense mission. We show...
The Chicxulub asteroid impact event at the Cretaceous-Paleogene (K-Pg) boundary ~66 Myr ago is widely considered responsible for mass extinction leading to demise of non-avian dinosaurs. Short-term cooling due massive release climate-active agents hypothesized have been crucial, with S-bearing gases originating from target rock vaporization an important driving force. Yet, magnitude S remains poorly constrained. Here we empirically estimate amount impact-released relying on concentration and...
LunarLeaper is a mission concept designed to robotically explore subsurface lava tubes on the Moon. Lunar pits, steep-walled collapse features, are thought be connected such tube systems and more than 300 have been identified through remote sensing. These natural structures hold immense value for exploration scientific investigations, because they offer protection from radiation, micrometeorites, harsh temperature fluctuations lunr surface as such, proposed possible future human habitation....