Results 191 to 200 of about 2,082 (217)

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.
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Unnumbered Short-Period Comets

2017
The following lists comets having periods of less than 25 years that have either been discovered in recent years or for which a short-period orbit has recently been calculated. Most of these objects will probably be recovered at future apparitions and be given permanent numbers.
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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
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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.
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Chondrulelike Objects in Short-Period Comet 81P/Wild 2

Science, 2008
The Stardust spacecraft returned cometary samples that contain crystalline material, but the origin of the material is not yet well understood. We found four crystalline particles from comet 81P/Wild 2 that were apparently formed by flash-melting at a high temperature and are texturally, mineralogically, and compositionally similar to chondrules ...
Tomoki, Nakamura, Takaaki, Noguchi, Akira, Tsuchiyama, Takayuki, Ushikubo, Noriko T, Kita, John W, Valley, Michael E, Zolensky, Yuki, Kakazu, Kanako, Sakamoto, Etsuko, Mashio, Kentaro, Uesugi, Tsukasa, Nakano   +11 more
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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
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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.
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Meteoroid impact into short-period comet nuclei

Nature, 1981
The effects of extended meteoroid bombardment on short-period comet nuclei are examined and their possible implications for asteroid and meteorite studies are discussed. It is suggested that after devolatilization of the nucleus, the accumulated material might combine with primary cometary solids to produce environments conducive to the formation of ...
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Searching for the source of short-period comet nuclei: The direction of the spatial migration of comets

Kinematics and Physics of Celestial Bodies, 2012
An attempt is made to determine the spatial location of the main source of short-period comet nuclei. Numerical calculations for the orbital evolution of Jupiter family comets, medium-period comets, and Centaurs are used to show that the orbits of small solar system bodies tend to evolve in the direction of increasing semimajor axes.
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Catalogue of short-period comets

Icarus, 1988
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