Josef Ďurech

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We present simulations on the asteroid photometric data that will be provided by the PanSTARRS (Panoramic Survey Telescope and Rapid Response System). The simulations were performed using realistic shape and light-scattering models, random orientation of spin axes, and rotation periods in the range 2–24 h. We show that physical models of asteroids can be(More)
The anisotropic reflection and thermal re-emission of sunlight from an asteroid's surface acts as a propulsion engine. The net propulsion force (Yarkovsky effect) changes the orbital dynamics of the body at a rate that depends on its physical properties; for irregularly shaped bodies, the propulsion causes a net torque (the(More)
Context. Near-Earth asteroid 162173 (1999 JU3) is a potential flyby and rendezvous target for interplanetary missions because of its easy to reach orbit. The physical and thermal properties of the asteroid are relevant for establishing the scientific mission goals and also important in the context of near-Earth object studies in general. Aims. Our goal was(More)
We present an overview of our work on shape and spin state determination of asteroids from photometric data sparse in time. Our results are based on simulations that were performed using realistic shape and light-scattering models and time sequences that will be provided by Pan-STARRS (Panoramic Survey Telescope and Rapid Response System). We show some(More)
We present the project Asteroids@home that uses distributed computing to solve the time-consuming inverse problem of shape reconstruction of asteroids. The project uses the Berkeley Open Infrastructure for Network Computing (BOINC) framework to distribute, collect, and validate small computational units that are solved independently at individual computers(More)
J.P Emery, A.W. Harris, M. Kaasalainen, and J. Berthier, SETI Institute, Carl Sagan Center, 515 N. Whisman Road, Mountain view CA 94043, USA, UC-Berkeley, Dept of Astronomy, 601 Campbell Hall, Berkeley CA 94720, USA. Institut de Mécanique Céleste et de Calcul des Éphémérides, Observatoire de Paris, France, Astronomical(More)
Asteroids with satellites are natural laboratories to constrain the formation and evolution of our solar system. The binary Trojan asteroid (624) Hektor is the only known Trojan asteroid to possess a small satellite. Based on W. M. Keck adaptive optics observations, we found a unique and stable orbital solution, which is uncommon in comparison to the orbits(More)
LSST will provide huge advances in our knowledge of millions of astronomical objects “close to home’”– the small bodies in our Solar System. Previous studies of these small bodies have led to dramatic changes in our understanding of the process of planet formation and evolution, and the relationship between our Solar System and other systems. Beyond(More)
We present the analysis of high angular resolution observations of the triple asteroid (87) Sylvia collected with three 8–10 m class telescopes (Keck, VLT, Gemini North) and the Hubble Space Telescope. The moons’ mutual orbits were derived individually using a purely Keplerian model. We computed the position of Romulus, the outer moon of the system, at the(More)
Over the years 1983-1988 cardiosurgical procedures with extracorporeal circulation without catheterization of the heart were indicated in 191 patients, representing 19.8% of all the patients operated on at extracorporeal circulation (n--962). Indications for surgery were made on the basis of the clinical state of the patient and of the results of(More)
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