Results 11 to 20 of about 586,778 (202)
Astronomy & Astrophysics, 2021 Jan Hendrik Oort hypothesized the existence of a distant cloud of cometary objects that orbit the Sun based on a spike in the reciprocal orbital separation at 1∕a ≲ 10−4au−1. The Oort cloud is the source of long-period comets, but has not been observed directly, and its origin remains theoretical.
Portegies Zwart, S.F. +3 more
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Monthly Notices of the Royal Astronomical Society: Letters, 2023 ABSTRACT Dynamical instabilities among giant planets are thought to be nearly ubiquitous and culminate in the ejection of one or more planets into interstellar space. Here, we perform N-body simulations of dynamical instabilities while accounting for torques from the galactic tidal field.
Raymond, Sean N. +2 more
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Notes on the outer-Oort-cloud formation efficiency in the simulation of Oort cloud formation [PDF]
Astronomy & Astrophysics, 2009 Aims. The formation efficiency of the outer Oort cloud, obtained in the simulation performed in our previous work, appeared to be very low in a comparison with the corresponding results of other authors. Performing three other simulations, we attempt to find if any of three possible reasons can account for the discrepancy. Methods.
P. A. Dybczyński +4 more
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The “memory” of the Oort cloud (Corrigendum) [PDF]
Astronomy & Astrophysics, 2019 International ...
Fouchard, Marc +3 more
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A Spiral Structure in the Inner Oort Cloud
The Astrophysical JournalAs the Galactic tide acts to decouple bodies from the scattered disk it creates a spiral structure in physical space that is roughly 15,000 au in length. The spiral is long-lived and persists in the inner Oort cloud to the present time.
David Nesvorný +7 more
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Oort Cloud Formation and Evolution in Star Clusters
The Astrophysical JournalIt is unknown whether an Oort cloud reaches its maximum mass within its star’s birth cluster or millions of years later. Complicating the Oort cloud evolution process is the fact that comets can be stripped from orbit due to perturbations from passing ...
Justine C. Obidowski +3 more
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Inner solar system material discovered in the Oort cloud. [PDF]
Sci Adv, 2016 We have observed C/2014 S3 (PANSTARRS), a recently discovered object on a cometary orbit coming from the Oort cloud that is physically similar to an inner main belt rocky S-type asteroid.
Meech KJ +8 more
europepmc +2 more sources
Dynamical evolution of the Oort cloud [PDF]
International Astronomical Union Colloquium, 1985 AbstractNew studies of the dynamical evolution of cometary orbits in the Oort cloud are made using a revised version of Weissman’s (1982) Monte Carlo simulation model, which more accurately mimics the perturbation of comets by the giant planets.
F. Remy, F. Mignard
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Impact cratering and the Oort Cloud [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 We calculate the expected flux profile of comets into the planetary system from the Oort cloud arising from Galactic tides and encounters with molecular clouds. We find that both periodic and sporadic bombardment episodes, with amplitudes an order of magnitude above background, occur on characteristic timescales ~25-35 Myr.
Wickramasinghe, J. T., Napier, W. M.
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A literary analysis of the Oort Cloud: Summarising its history and proposing a mission to image Oort Cloud Objects [PDF]
, 2023 The Oort Cloud was hypothesised in 1950 but has lost popularity as a research topic. This literary research summarises the most notable articles and simulations on the Oort Cloud with an analysis on the outdated simulations and assumptions. Finally, this
Keeley, Avital
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