Results 231 to 240 of about 2,956 (261)

Photometry of four long-period comets

Planetary and Space Science, 2021
Abstract In this work we studied the activity of four long period comets at different heliocentric distances in order to explore their dust production and characteristics. The targets were the comets C/2011 A3 (Gibbs), C/2012 K1 (PanStarrs), C/2012 LP26 (Palomar) and C/2013 F3 (McNaught). Some of these objects have never been studied before.
Garcia, Romina Soledad, Gil Hutton, Ricardo Alfredo   +1 more
exaly   +4 more sources

Meteor showers from known long-period comets

Icarus, 2021
peer reviewedWhat long-period comets with orbital periods >250 years cause detectable meteor showers on Earth? Low-light video cameras are used to track the motion of +4 to -5 magnitude meteors in our atmosphere by triangulation and calculate the ...
Peter Jenniskens, Mohammad Odeh, Peter S Gural   +2 more
exaly   +2 more sources

Some properties of the distribution of long period comets.

, 2015
The scope of the present study is to compare the flux of observable long period comets obtained numerically to the observed flux of long period comets. Such comparison should give us some hint about the incompleteness of the observed flux with respect to the perihelion distances, the validity of the injection scenario toward the observability, and to ...
Fouchard, Marc, Rickman, Hans, Valsecchi, Giovanni B., Froeschlé, Christiane   +3 more
openaire   +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

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 ...
L Inno
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

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

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

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.
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.
openaire   +1 more source