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Mon. Not. R. Astron. Soc. 000, 000000 (0000) Printed 13 August 2007 (MN LATEX style file v2.2) The fundamental role of the Oort cloud in determining the
 

Summary: Mon. Not. R. Astron. Soc. 000, 000000 (0000) Printed 13 August 2007 (MN LATEX style file v2.2)
The fundamental role of the Oort cloud in determining the
flux of comets through the planetary system
V.V. Emel'yanenko1
, D.J. Asher2
and M.E. Bailey2
1South Ural University, Chelyabinsk, 454080, Russia
2Armagh Observatory, College Hill, Armagh, BT61 9DG
Accepted 2007 July 24. Received 2007 July 11; in original form 2007 June 5
ABSTRACT
A model of the Oort cloud has been developed by accounting for planetary, stellar and
Galactic perturbations using numerical symplectic integrations covering 4.5 Gyr. The
model is consistent with the broad dynamical characteristics of the observed cometary
populations injected from the Oort cloud into different regions of the Solar system.
We show that the majority of observed high-eccentricity trans-Neptunian objects,
Centaurs and short-period comets have visited the Oort cloud (a > 1000 au) during
their dynamical history. Assuming from observations that the near-parabolic flux from
the Oort cloud with absolute magnitudes H10 < 7, perihelion distances q < 5 au and
a > 104
au is approximately 1 comet per year, our calculations imply a present Oort

  

Source: Armagh Observatory

 

Collections: Physics