Context. Apart from thousands of "regular" exoplanet candidates, Kepler satellite has discovered a small number stars exhibiting peculiar eclipse-like events. They are most probably caused by disintegrating bodies transiting in front the star. However, nature and obscuration events, such as those observed KIC 8462852, remain mysterious. A swarm comets or artificial alien mega-structures have been proposed an explanation for latter object.

Aims. We studied the structure of meteoroid particle complexes released from asteroid 196 256 (2003 EH1) to reveal relationship meteor showers observed in Earth's atmosphere that belong this complex as well. In addition, we between and comet 96P/Machholz, which is situated same orbital phase space.

Modeling the formation of ice giants Uranus and Neptune is a long-lasting problem in planetary science. Due to gas-drag, collisional damping, resonant shepherding, embryos repel planetesimals away from their reach thus they stop growing (Levison et al. 2010). This persists independently whether accretion took place at current locations or closer Sun. Instead trying push runaway/oligarchic growth up 10-15 Earth masses, we envision possibility that planetesimal disk could generate system only...

Aims. The structure of the complex meteoroid particles released from comet 96P/Machholz is studied to reveal a relationship among meteor showers observed in Earth's atmosphere that belong this complex.

We model a variety of meteoroid streams originating from asteroid 3200 Phaethon and follow their dynamical evolution. The modelling is performed for several past perihelion passages the parent body. particles in models are perturbed (i) only by gravity planets, (ii) both Poynting–Robertson effect. confirm that complex consists two filaments: Geminids Daytime Sextantids. most found to be younger than about 1000 years old physical properties have correspond values parameter β (giving strength...

As was discovered in the nineteen-twenties, a significant electric field exists solar corona as well interior. This is consequence of tendency light electrons to segregate from heavier protons gravitational field. Since principle valid for plasma every star, result can be generalized. The presented paper intended rehighlight this physical property stars. In particular, we stress that there has charge Qr inside stellar sphere with radius r, which linearly proportional mass Mr sphere. Both...

Aims. We present a study of the meteor complex short-period comet 2P/Encke. Methods. For five perihelion passages parent in past, we modeled associated theoretical stream. Specifically, each our models corresponds to part stream characterized with single value evolutionary time and strength Poynting–Robertson effect. In model, follow dynamical evolution 10 000 test particles via numerical integration. The integration was performed from when set assumed be ejected comet’s nucleus up present....

Using the Lynch method, we continue discussion on statistical significance of agreement between planetary distributions and a power law. The method determines probability that law (e.g. Titius–Bode law) will agree by chance, at observed level, with given sequence distances. We find interesting results assuming not only mean asteroid-belt distance should be considered as regular distance, but also current Earth regarded peculiar omitted from examine these assumptions under two cases: (a)...

Aims. In our overall work, we attempt to predict some new meteor showers associated with as many possible known periodic comets and find the generic relationship of already these comets. this paper, focus attention on meteor-shower complex long-period comet C/1917 F1 (Mellish), which is parent body December Monocerotids. Some other have also been suggested be comet. We map its whole here.

Aims.We attempt to prove or disprove the comet 96P/Machholz and asteroid 2003 EH1 as parents of Quadrantids. These two bodies have been regarded most probable candidates. Moreover, we investigate a possibility an existence their common progenitor, in past.

Considering the model of initial disc planetesimals consisting 10 038 test particles, we simulated formation distant comet reservoirs up to 2 Gyr. The result concerning outer part Oort cloud (OC) was described in our previous paper. Here, deal with evolution population and structure at Gyr complementary inner OC. dynamical massless particles followed via numerical integration their orbits. We considered perturbations produced by four giant planets assuming they have current orbits masses, as...

Context.The discovery efficiency of the dynamically new comets has been assumed to be approximately same as that all long-period (LP) when estimating population Oort cloud. On other hand, studies so-called fading problem have implied a strong difference in efficiencies both and old comets. Some authors attempted explain this discrepancy by suggesting disappeared due extinction or disintegration their nuclei.

Aims. Considering a model of an initial disk planetesimals that consists 10 038 test particles, we simulate the formation distant-comet reservoirs for first 1 Gyr. Since only outer part Oort cloud can be formed within this period, analyse efficiency process and describe approximately structure formed.

Aims. We intend to map the whole meteor complex of long-period comet C/1979 Y1 (Bradfield), which is a proposed parent body July Pegasids, No. 175 in list showers established by Meteor Data Center (MDC) International Astronomical Union (IAU).

Aims. We study the meteoroid stream of long-period comet C/1975 T2 (Suzuki-Saigusa-Mori). This was suggested as parent body established λ -Ursae Majorid meteor shower, No. 524. Methods. modeled 32 parts a theoretical considered. Each our models is characterized with single value evolutionary time and strength Poynting-Robertson effect. The ranges from 10 000 to 80 yr. It period during which evolution part followed. In each model, dynamical test particles then followed, via numerical...

We consider the influx of a collinear stream interstellar particles (ISPs) into Solar System for case where non-gravitational forces are negligible (particle size m) and model their Keplerian trajectories to yield expected heliocentric orbits on impact with Earth. The orbital characteristics such ISPs undergo cyclic seasonal variations allowing determination inflow direction far-Sun speed orbit element signatures.