Présidents de session
The dynamic of comets
- Alessandro Morbidelli
The dynamic of comets
- Christiane Froeschlé
The dynamic of comets
- Christiane Froeschlé
The dynamic of comets
- Nicolas Biver
The dynamic of comets: The dynamic of comets
- Nicolas Biver
The dynamic of comets
- Antonella Barucci
Nathan Kaib
(University of Oklahoma)
17/05/2016 10:15
The dynamic of comets
Talk
The Oort cloud has previously been invoked to explain observations of centaurs with very high inclinations and/or very large semimajor axes since such orbits are difficult to generate from the scattered disk. However, the known sample of centaurs has been detected with a combination of surveys with different observational biases, some more well-characterized than others. Consequently, it is...
Prof.
Vacheslav Emel'yanenko
(Institute of Astronomy, RAS)
17/05/2016 11:00
The dynamic of comets
Talk
We discuss how many comets come to short-period orbits from different sources in the outer solar system. The observed distribution of Centaurs, as a transition population, plays a pivotal role in constraining our models. We show that the Oort cloud and the scattered disc produce similar numbers of Jupiter-family comets.
Dr
Piotr A. Dybczyński
(Astronomical Observatory Institute, faculty of physics, A.Mickiewicz Univ., Poznań, Poland)
17/05/2016 14:00
The dynamic of comets
Talk
Galactic and stellar perturbations are important factors when studying the
past and future motion of the observed Oort spike comets. Since our
knowledge on the Solar System Galactic environment is continuously
increasing it is necessary to upgrade our methods and computer codes for
taking into account these perturbations in a proper way. I will report our
preparations to incorporate new...
Małgorzata Królikowska
(SRC PAS)
17/05/2016 14:45
The dynamic of comets
Talk
Currently, this Catalogue includes orbits of about 160 Oort spike comets defined as objects with original 1/a less than 0.000100 au$^{-1}$. Orbits were determined or redetermined in a completely homogeneous way and constitute more than 85% of the Oort spike comets discovered before 2010. In the publicly available Catalogue, we offer observed (i.e. osculating orbit at the epoch close to the...
Dr
Brasser Ramon
(Institute for Astronomy and Astrophysics, Taiwan)
17/05/2016 16:00
The dynamic of comets
Talk
I discuss how the proposed instability of the giant planets that
sculpted the Kuiper Belt and Scattered Disc also formed the Oort comet
cloud. I show the results of numerical simulations of this problem and
discuss formation efficiency, number of comets in the cloud and the Oort
cloud to Scattered Disc population ratios. I compare these with
observations and give an updated estimate based...
Hans Rickman
(Uppsala University)
17/05/2016 16:45
The dynamic of comets
Talk
Solar type stars typically form as members of embedded clusters, which dissolve on different time scales depending on their masses and densities. Most such clusters are small and short-lived, and Oort Cloud (OC) formation has often been modeled within such a scenario. But Lada & Lada (2003) showed that about equal numbers of stars are formed in clusters with populations of 10^2, 10^3 and 10^4...
Marc Fouchard
18/05/2016 09:15
The dynamic of comets
Talk
We will present our last results on the long term dynamics of the Oort cloud comets. It particular the final shape of the Oort cloud and its dependency on the initial condition sample will be investigated. The relations between the final shape and present flux of observable "new" long period comets are also highlighted.
Giovanni Valsecchi
(IAPS-INAF)
18/05/2016 10:00
The dynamic of comets
Talk
Close encounters with the giant planets play an important role in the
evolution of the orbits of long period comets, and have been treated in
a number of papers. We revisit the subject in the framework of an
analytic theory of close encounters, that provides useful insight on the
properties of the strong perturbations caused by planetary encounters.
Prof.
Rudolf Dvorak
(Universite de Vienne, Autriche)
18/05/2016 11:15
The dynamic of comets
Talk
We investigate whether there can exist comet families in the extrasolar planetary systems
Kepler 90 and HD 10180, systems which consist of six planets; the outermost is a giant.
This is done by extensive numerical integrations of millions of hypothetical comets entering the inner system on almost hyperbolic orbits. The goal is to find whether
families like the Halley comets or the Jupiter...
Hans Rickman
(PAS Space Research Center, Warszawa, Poland)
19/05/2016 17:00
The dynamic of comets
Talk
We have simulated the orbital evolution of icy planetesimals ("comets") in the inner solar system upon dispersal of the primordial planetesimal disk by giant planet migration as prescribed by the Nice Model. Using both the assumption of non-evolving comets and models including erosion by sublimation and splitting, we have estimated the impact rate and crater formation due to these comets on...
