EDP Sciences
Free Access
Volume 396, Number 1, December II 2002
Page(s) 283 - 292
Section The solar system
DOI https://doi.org/10.1051/0004-6361:20021400
Published online 22 November 2002

A&A 396, 283-292 (2002)
DOI: 10.1051/0004-6361:20021400

Simulating observable comets

I. The effects of a single stellar passage through or near the Oort cometary cloud
P. A. Dybczynski

Astronomical Observatory of the A. Mickiewicz University, Sloneczna 36, 60-286 Poznan, Poland
(Received 2 July 2002 / Accepted 9 September 2002 )

This is the first of a series of papers presenting an attempt to reproduce the mechanisms acting currently on the Oort cloud of comets and producing the observed long-period comets. In this first part we give a short review of papers on the stellar perturbations on the cometary cloud and on the observed long-period comet perihelia/aphelia directions distribution. We present in detail the effects of a single stellar passage through or near the cometary cloud by means of a Monte Carlo simulation based on the improved impulse approximation. The simulations are performed for two different steady-state numerical models of the Oort cloud and for different parameters of the stellar passage. Among others, we calculate the probabilities of producing an observable comet as well as ejecting it from the cloud, we characterize cometary shower resulting from the close stellar passage and discuss anisotropies in the observable sample of comets, produced by a simulated single stellar perturbation.

Key words: comets: general -- Oort cloud -- solar system: general

SIMBAD Objects

© ESO 2002

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.