A5050069906- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Astronomical and nuclear sciences
- Isotope Analysis in Ecology
- Gamma-ray bursts and supernovae
- Space Satellite Systems and Control
- Space Exploration and Technology
- High-pressure geophysics and materials
- Plant Ecology and Taxonomy Studies
- Advanced Topics in Algebra
- Radio Astronomy Observations and Technology
- Botany and Plant Ecology Studies
- Laser-induced spectroscopy and plasma
- Biological Activity of Diterpenoids and Biflavonoids
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Astrophysical Phenomena and Observations
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Plant and animal studies
McDonald's (United States)
2023
Adıyaman University
2023
Odlewnie Polskie (Poland)
2023
Adam Mickiewicz University in Poznań
2011-2022
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...
<i>Aims. <i/>From July 2006 to 2007 a very small asteroid orbited the Earth within its Hill sphere. We used this opportunity study rotation and estimate diameter shape.<i>Methods. <i/>Due faintness, RH<sub>120<sub/> was observed photometrically with new 10-m SALT telescope at SAAO (South Africa). obtained data on four nights: 11, 15, 16, 17 March when solar phase angle remained almost constant 74°. The observations lasted about an hour each night object exposed for 7-10 s through "clear"...
Aims. We determine the physical properties (spin state and shape) of asteroid (21) Lutetia, target ESA Rosetta mission, to help in preparing for observations during flyby on 2010 July 10 by predicting orientation Lutetia as seen from Rosetta. Methods. use our novel KOALA inversion algorithm asteroids a combination optical lightcurves, disk-resolved images, stellar occultations, although latter are not available Lutetia. Results. find spin axis lie within 5 degrees ({\lambda} = 52 deg.,...
Context. Blue supergiant stars are known to display photometric and spectroscopic variability that is suggested be linked stellar pulsations. Pulsational activity in massive strongly depends on the star’s evolutionary stage assumed connected with mass-loss episodes, appearance of macroturbulent line broadening, formation clumps wind.
<i>Context. <i/>Research of asteroid families has been recently refreshed by the discovery very young ones. These are great interest because they represent product their parent body fragmentation before orbital and physical evolutionary processes can change them. A cluster seven objects around largest (1270) Datura is particular it enough known members resides in inner part main belt, facilitating observations.<i>Aims. <i/>We carried out photometric observations two family – asteroids...
Context. The shapes and spin states of asteroids observed with photometric techniques can be reconstructed using the lightcurve inversion method. resultant models then confirmed or exploited further by other techniques, such as adaptive optics, radar, thermal infrared, stellar occultations, space probe imaging.
We have analysed high-resolution spectra of 28 A and 22 F stars in the Kepler field, observed using Fibre-Fed Échelle Spectrograph at Nordic Optical Telescope. provide spectral types, atmospheric parameters chemical abundances for 50 stars. Balmer, Fe i ii lines were used to derive effective temperatures, surface gravities microturbulent velocities. determined projected rotational velocities a spectrum synthesis technique. Effective temperatures calculated by energy distribution fitting are...
Asteroid spectroscopy reflects surface mineralogy. There are few thousand asteroids whose surfaces have been observed spectrally. Determining the properties of those objects is important for many practical and scientific applications, such as example developing impact deflection strategies or studying history evolution Solar System planet formation. The aim this study to develop a pre-selection method that can be utilized in searching any taxonomic complex. could then im multiple...
Context. Earlier work suggests that slowly rotating asteroids should have higher thermal inertias than faster rotators because the heat wave penetrates deeper into sub-surface. However, been determined mainly for fast due to selection effects in available photometry used obtain shape models required thermophysical modelling (TPM). Aims. Our aims are mitigate these by producing of slow rotators, scale them and compute their inertia with TPM, verify whether increases rotation period. Methods....
We report photometric lightcurve observations of 184 Dejopeja (apparition years: 2000, 2002, 2005, 2006), 276 Adelheid (2000, 2001, 2004, and 556 Phyllis (1998, 2006) carried out on 48 nights at four observatories. Using all the available lightcurves, spin vectors, senses rotation, shape models these three asteroids have been determined.
CCD photometry of 809 Lundia obtained between September 2005 and January 2006 at Borowiec Pic du Midi Observatories demonstrates that this object is a synchronous binary system with an orbital period 15.418 <i>±<i/> 0.001 h. In paper, we present the results photometric observations from two oppositions in 2005/2006 2007, as well first modelling system. For simplicity assumed fluid-like nature for each component modified Roche model triaxial ellipsoid shape kinematic models. Our models...
Context. Recent studies have uncovered evidence that the statistical properties of asteroids' physical parameters are a fundamental source information on physics their collisions and evolution. The analysis spin rates vector distributions helps us to understand role various known new effects. alignment vectors correlation for first time observed ten members Koronis family. These unexpected non-random orientations axes correlations rates, now as Slivan states interpreted in terms YORP effect...
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...
Asteroid (234) Barbara is the prototype of a category asteroids that has been shown to be extremely rich in refractory inclusions, oldest material ever found Solar system. It exhibits several peculiar features, most notably its polarimetric behaviour. In recent years other objects sharing same property (collectively known as 'Barbarians') have discovered. Interferometric observations mid-infrared with ESO VLTI (Very Large Telescope Interferometer) suggested might bi-lobated shape or even...
<i>Aims. <i/>Very small asteroids (VSAs) are thought to be the building blocks of larger and, as such, interesting study. Many these monolithic or deeply fractured objects display rapid rotations with periods short several minutes. Observations such can reveal their spin limits, which related tensile strength interiors. The evolution spins is primarily shaped by YORP effect, theory needs comparison observations.<i>Methods. <i/>With 10 m SALT telescope, we observed VSAs belonging near-Earth...
The second Gaia data release (Gaia DR2) provided us with the precise five-parameter astrometry for 1.3 billion of sources. As stars passing close to Solar System are thought be responsible influencing dynamical history long period comets, we update and extend list that could potentially perturb motion these comets. We aim announce a publicly available database containing an up date stellar systems perturbing comets motion. add new objects revise previously published lists. Special emphasis...
Photometric observations of 283 Emma (1998, 2000, 2001, 2004), 665 Sabine 1999, 2004, 2005), and 690 Wratislavia 2005–2006) carried out on 44 nights at two observatories are presented. Using all available lightcurves, the spin vectors, senses rotation, shape models for these three asteroids have been determined.
Context. The set of more than 100 asteroids, for which spin parameters have been modelled using an amplitude, magnitude or epoch methods, showed a pronounced gap in the distribution asteroid axes. These axes are rarely aligned with ecliptic plane.
Abstract Long (>2 s) gamma-ray bursts (GRBs) are associated with explosions of massive stars, although in three instances, supernovae (SNe) have not been detected, despite deep observations. With new H i line and archival optical integral-field spectroscopy data, we characterize the interstellar medium (ISM) host galaxy one these events, GRB 111005A, order to shed light on unclear nature peculiar objects. We found that atomic gas, radio continuum, rotational patterns general very smooth...
We present a set of new photometric observations three main belt asteroids: 160 Una, 747 Winchester, and 849 Ara. This, combined with the available data, allowed us to construct their physical models. The lightcurve inversion method was used obtain spins shapes. have resolved problems rotation period found it be h, almost twice value given in literature.
We present photometric observations of three asteroids: 73 Klytia, 377 Campania, and 378 Holmia, together with their spin shape models. The models were constructed the lightcurve inversion method, using all available lightcurves these objects. In case long persisting doubts about its rotational period have been resolved. Various authors state periods between 8.48 16 h, while we determined is h.
We analyze photometric observations of the three main-belt asteroids 350 Ornamenta, 771 Libera, and 984 Gretia, conducted over a twelve-year interval. Our data those other authors allow us to determine pole shape models using lightcurve inversion technique. In all cases, single solution was obtained without any significant mirror solution: Ornamenta – h, , Libera Gretia . This analysis development asteroid increase set with known spin parameters, which consists only around 100 objects.