Results 211 to 220 of about 30,236 (236)

Hypothetical evolutions of short-period comets

Symposium - International Astronomical Union, 1996
The hypothetical model of capture I consider is as follows: a comet with an initial conic orbit, meets close to one of its vertices an outer planet and generates one or several little comets (crossing of the Roche limit) with an elliptic orbit. This initial vertex always remains one of the vertices of the captured orbit by the Solar System.
openaire   +1 more source

Numbered Observable Short-Period Comets

2017
The following list includes all numbered comets of short period cataloged until June 2016 that have been observed at their most recent favorable apparition and that, presumably, still existed as of that date.
openaire   +1 more source

Orbits of Short Period Comets Captured from the Oort Cloud

Earth, Moon, and Planets, 1996
Oort cloud comets occasionally obtain orbits which take them through the planetary region. The perturbations by the planets are likely to change the orbit of the comet. We model this process by using a Monte Carlo method and cross sections for orbital changes, i.e.
J. Q. Zheng, M. J. Valtonen, S. Mikkola, M. Korpi, H. Rickman   +4 more
openaire   +1 more source

Capture Statistics of Short-Period Comets: Implications for Comet D/Shoemaker–Levy 9

Icarus, 1996
Abstract Comet D/Shoemaker–Levy 9 orbited Jupiter for decades (P. W. Chodas and D. K. Yeomans 1995,Bull. Am. Astron. Soc.27, 1111–1112; L. A. M. Benner and W. B. McKinnon 1995,Icarus118, 155–168) and was tidally disrupted during the orbit before impact.
David M. Kary, Luke Dones
openaire   +1 more source

The distribution of short-period comet magnitudes

Earth, Moon, and Planets, 1987
Short-period comets with P ≤ 15 yr represent one of the most complete comet samples. The magnitude distribution of these comets was analysed using a maximum likelihood method. The brightness (magnitude) index for the comets with H 10 ≤ 11 mag was estimated together with the large sample errors and found to be 0.62 ± 0.09.
openaire   +1 more source

New edition of the catalogue of short-period comets

Earth, Moon, and Planets, 1995
The Institute of Theoretical Astronomy in St. Petersburg and the Astronomical Institute in Bratislava are preparing a new edition of the Catalogue of short-period comets. This edition will be supplemented by short-period comets discovered after the year 1983 and comprises some new features, e. g. the evolution of orbital elements between the years 1750
Y. D. Medvedev, E. A. Kozlov, E. M. Pittich   +2 more
openaire   +1 more source

Meteor contribution by short-period comets

1988
The contribution of P/Halley and other comets to the meteor streams are discussed. Particular attention is given to the meteoric production by P/Encke as the potential major contributor to the meteoric complex in the inner part of the solar system. The density and total mass of the meteoric stream associated with P/Encke is derived, taking into account
openaire   +1 more source

Thermal evolution and differentiation of a short-period comet

Planetary and Space Science, 1993
Abstract The evolution of the subsurface layers of a short-period comet has been studied. The structure and composition of the surface layers due to sublimation recondensation phenomena, to gas diffusion processes through the pore system and to the ejection of dust particles have been investigated in detail. The nucleus has been modelled as a mixture
S. Espinasse, A. Coradini, M.T. Capria, F. Capaccioni, R. Orosei, M. Salomone, C. Federico   +6 more
openaire   +1 more source

Can short period comets maintain the zodiacal cloud?

2008
The combined effects of the Poynting-Robertson drag, collisions and sputtering are destroying the interplanetary dust cloud. The mass-losses estimated by different authors reveal great discrepancies. The estimations range from 1 t sec −1 (purely Poynting-Robertson loss) over some 10 t sec −1 given by Whipple (1967) to a value of 100 t sec −1 which ...
openaire   +1 more source

Terrestrial impact rates for long and short-period comets

1982
Terrestrial impact rates are calculated for long and short-period comets crossing the earth’s orbit. For a random long-period comet the impact probability is 2.2 × 10 −9per perihelion passage and the most probable impact velocity is 56.6 km s −1. Based on the sample of 20 observed earth-crossing short-period comets the mean impact probability is 6.6 ...
openaire   +1 more source