Results 181 to 190 of about 10,510,627 (209)

Capture of interstellar objects: a source of long-period comets

Monthly Notices of the Royal Astronomical Society: Letters, 2020
We simulate the passage through the Sun–Jupiter system of interstellar objects (ISOs) similar to 1I/‘Oumuamua or 2I/Borisov. Capture of such objects is rare and overwhelmingly from low incoming speeds on to orbits akin to those of known long-period ...
Walter Dehnen
exaly   +2 more sources

Dynamical history of the observed long-period comets

Astronomy and Astrophysics, 2001
We present results of some numerical studies on the dynamical history of a large number of observed long-period comets. In our investigations we include all comets with good quality orbits.
P. A. Dybczyński
exaly   +2 more sources

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Origin and Evolution of the Long-Period Comets

Earth, Moon, and Planets, 1996
We consider the changes of cometary perihelion distances as a process of diffusion in the value of q, due to perturbations by stars. We find more comets at large q values than is observed. This suggests that a large number of long-period comets is not observed.
openaire   +1 more source

How much earlier would LSST have discovered currently known long-period comets?

Icarus
Among solar system objects, comets coming from the Oort Cloud are an elusive population, intrinsically rare and difficult to detect. Nonetheless, as the more pristine objects we can observe, they encapsulate critical cues on the formation of planetary ...
Laura Inno
exaly   +3 more sources

Long-Period Comets and the Oort Cloud

Earth, Moon, and Planets, 2000
Long-period (LP) comets, Halley-type (HT) comets, and even some comets of the Jupiter family, probably come from the Oort cloud, a huge reservoir of icy bodies that surrounds the solar system. Therefore, these comets become important probes to learn about the distant Oort cloud population.
openaire   +1 more source

Distribution of the Aphelia of Long-Period Comets

Publications of the Astronomical Society of Japan, 1976
Abstract By examining the distribution of aphelia of all the comets observed since 1800, we find that the aphelia of long-period comets show a remarkable concentration near the antapex of the solar motion. Some possible interpretations of this phenomenon are discussed in connection with the origin of long-period comets.
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Long‐period Comets and the Oort Cloud

Annals of the New York Academy of Sciences, 1997
ABSTRACT: The long‐period comets pose a unique problem for the impact hazard problem. Because of their very long orbital periods and generally large distances from the Sun, they cannot be surveyed and catalogued in the same manner as the near‐Earth asteroids and short‐period comets. They appear at random, uniformly distributed on the celestial sphere.
openaire   +1 more source

Why Halley-Types Resonate but Long-Period Comets Don't: A Dynamical Distinction between Short- and Long-Period Comets☆

Icarus, 1997
Abstract Several recent studies have noted that the orbital evolution of many comets is influenced by mean-motion resonances with Jupiter. However, the distribution and relative importance of these resonances and the orbital characteristics of the comets affected have not been addressed to date.
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The Shortage of Long-Period Comets in Elliptical Orbits

Symposium - International Astronomical Union, 1979
Based on the number of ‘new’ comets seen on near-parabolic orbits, one can predict the number of comets that should be found on definitely elliptical orbits on their subsequent returns. We show here that about three out of four of these returning comets are not observed.
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Distribution of long-period comets in perihelion distance

International Astronomical Union Colloquium, 1999
AbstractDistribution of long-period comets in perihelion distance is investigated. The relationN( > q)=C qαseems to be a good approximation to the reality −N(>q)is the number of long-period comets with perihelion distance greater than the valueq( in AU). The complete group of long-period comets is characterized by the valueα =4/3, however,
openaire   +1 more source