Results 11 to 20 of about 2,536 (230)
Reassessing the Source of Long-Period Comets [PDF]
Science, 2009 Inside Oort Long-period comets are thought to come from the outermost region of the solar system, the Oort Cloud, where a large number of icy bodies orbit the Sun. Outer Oort Cloud bodies are more likely to penetrate the inner planetary region of the solar system as comets, because they experience stronger external gravitational ...
Kaib, Nathan A., Quinn, Thomas
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Destruction of Long-period Comets
The Astronomical Journal, 2022 Abstract We identify a sample of 27 long-period comets for which both nongravitational accelerations and Lyα-based gas production rates are available. Seven of the 27 comets (i.e., ∼25%) did not survive perihelion because of nucleus fragmentation or complete disintegration.
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Disintegration of Long-period Comet C/2021 A1 (Leonard)
The Astronomical Journal, 2023 We present imaging observations of the disintegrating long-period comet C/2021 A1 (Leonard). High-resolution observations with the Hubble Space Telescope show no evidence for surviving fragments, and place a 3 σ upper limit on their possible radius of ...
David Jewitt +5 more
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Splitting of Long-period Comet C/2018 F4 (PANSTARRS)
The Astronomical Journal, 2023 Long-period comet C/2018 F4 (PANSTARRS) was observed to show duplicity of its inner region in 2020 September, suggestive of a splitting event. We here present analyses of our observations of the comet taken from the LCO Outbursting Objects Key project ...
Man-To Hui +6 more
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Dust Properties of Comets Observed by Spitzer
The Planetary Science Journal, 2023 As comets journey into the inner solar system, they deliver particulates and volatile gases into their comae that reveal the most primitive materials in the solar system.
David E. Harker +3 more
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Some Statistics on Long-Period Comets [PDF]
Symposium - International Astronomical Union, 1979 Distributions of the original reciprocal semimajor axes l/a and the perihelion distances q of eighty “new” comets (Marsden et al, 1978) are discussed from the view point of a hypothesis of the interstellar origin (Hasegawa, 1976).
I. Hasegawa, T. Shimizu
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Finding the imprints of stellar encounters in long-period comets [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 The solar system's Oort cloud can be perturbed by the Galactic tide and by individual passing stars. These perturbations can inject Oort cloud objects into the inner parts of the solar system, where they may be observed as the long-period comets (periods longer than 200 years).
Feng, Fabo, Bailer-Jones, C. A. L.
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The transition between long period comets, short period comets and meteoroid streams [PDF]
International Astronomical Union Colloquium, 1985 It has long been realised that Jovian perturbation is the dominant cause of the transition of long period comets (Period > 200 yr) into short period ones (P < 200 yr). When the differences in the detectability of comets in the two groups are taken into account it is clear that the present day flux of long period comets is sufficient to provide ...
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Distribution of long-period comets: comparison between simulations and observations [PDF]
Astronomy & Astrophysics, 2017 Aims. This paper is devoted to a comparison between observations and simulations of the so-called Oort spike formed by the “new” observable long-period comets. Methods. The synthetic distributions of observable comets come from the propagation of a huge sample of objects during the age of the solar system that were initially in a proto-Oort ...
Fouchard M +3 more
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The Oort Cloud and long‐period comets [PDF]
Meteoritics & Planetary Science, 2013 AbstractThis review starts with a brief historical overview of the subject, after which some recent papers attempting to improve the understanding of comet injection from the Oort Cloud and the origin of new comets are discussed. Special attention is paid to the importance of nongravitational effects in comet orbit determination, the synergy between ...
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