Results 231 to 240 of about 32,970 (273)

Balancing limited resources in actin networks competition

Guérin C, N'Diaye A, Gressin L, Mogilner A, Théry M, Blanchoin L, Colin A.   +6 more
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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
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Meteor showers from known long-period comets

Icarus, 2021
Abstract What 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 meteoroid orbit in space.
Jenniskens, Peter, Lauretta, Dante S., Towner, Martin C., Heathcote, Steve, Jehin, Emmanuel, Hanke, Toni, Cooper, Tim, Baggaley, Jack W., Howell, J. Andreas, Johannink, Carl, Breukers, Martin, Odeh, Mohammad, Moskovitz, Nicholas, Juneau, Luke, Beck, Tim, De Cicco, Marcelo, Samuels, Dave, Rau, Steve, Albers, Jim, Gural, Peter S.   +19 more
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Asymmetric nongravitational forces on long-period comets

Planetary and Space Science, 1995
Abstract We investigate the magnitude of the perturbation in a comet's energy caused by nongravitational forces and how these forces affect the dynamical evolution of long-period (LP) comets. From the study of the distribution of original energies or reciprocal semimajor axes ( 1 a ) orig of the observed sample of near-parabolic ...
A.D. Bolatto, J.A. Fernández, G.F. Carballo   +2 more
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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.
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Exploring Long-Period Comets from Multiple Staging Orbits

AIAA Scitech 2020 Forum, 2020
Objects that have retained pieces of information about the early Solar System are key to our understanding of its formation and evolutionary history. However, the high delta-V required to reach these objects, such as long-period comets or interstellar objects, makes designing an intercept mission at the time of detection impractical.
Gabriel Prescinotti Vivan, Jennifer Hudson   +1 more
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Searches for transplutonian planets using long-period comets

Astronomy Letters, 2006
We discuss the dynamical connection of long-period and nearly parabolic comets with hypothetical transplutonian planets. The statistics includes 792 comets with periods P > 200 years. The orbital plane of the parent planet can be determined from the observed distribution of the perihelia and poles of cometary orbits. The radius of a planetary orbit can
V. V. Kuz’michev, V. P. Tomanov
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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.
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