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Mon. Not. R. Astron. Soc. 361, 13451351 (2005) doi:10.1111/j.1365-2966.2005.09267.x Centaurs from the Oort cloud and the origin of Jupiter-family comets
 

Summary: Mon. Not. R. Astron. Soc. 361, 13451351 (2005) doi:10.1111/j.1365-2966.2005.09267.x
Centaurs from the Oort cloud and the origin of Jupiter-family comets
V. V. Emel'yanenko,1
D. J. Asher2
and M. E. Bailey2
1South Ural University, Chelyabinsk, 454080, Russia
2Armagh Observatory, College Hill, Armagh, BT61 9DG
Accepted 2005 June 3. Received 2005 May 31; in original form 2005 February 15
ABSTRACT
A numerical study of an ensemble of orbits based on observed objects in the near-Neptune
high-eccentricity (NNHE) region, with perihelion distances q in the range 28 < q < 35.5 au
and semimajor axes a in the range 60 < a < 1000 au, is used to predict the orbital distribution
of Centaurs (5 < q < 28 au) for comparison with observations after correcting for discovery
biases. The majority of Centaurs produced in this way have a 60 au. However, the intrinsic
number of observed Centaurs is dominated by longer period objects, the number with a > 60 au
being roughly an order of magnitude greater than that for a < 60 au, and therefore inconsistent
with a source in the NNHE region, which is broadly similar to the so-called `Scattered Disc'.
The observed distribution of Centaurs with a 60 au is also inconsistent with this source,
although it is conceivable that in this region the discrepancies might be explained by factors
such as out-gassing, splitting or varying albedo not included in our model. Thus, although

  

Source: Armagh Observatory

 

Collections: Physics