Results 161 to 170 of about 586,778 (202)
The Scattered Disk Population as a Source of Oort Cloud Comets: Evaluation of Its Current and Past Role in Populating the Oort Cloud [PDF]
Icarus, 2004 We have integrated the orbits of the 76 scattered disk objects (SDOs), discovered through the end of 2002, plus 399 clones for 5 Gyr to study their dynamical evolution and the probability of falling in one of the following end states: reaching Jupiter's ...
Tabaré Gallardo, Adrian Brunini
exaly +2 more sources
Stability in the Most External Region of the Oort Cloud: Evolution of the Ejected Comets
Monthly Notices of the Royal Astronomical Society, 2019 In this paper, we present a study of the dynamical effects of the Galaxy on the external region of the Oort Cloud. Theaimsofthispaperare: (i) to determine an outer limit for the Oort Cloud; and (ii) to analyse the dynamical behaviour of the most external
M F Calandra
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Capture of the Sun's Oort Cloud From Stars in Its Birth Cluster
Science, 2010 Out of the Oort Cloud Long-period comets originate from the Oort cloud, a vast reservoir of icy bodies that surrounds the solar system. These bodies are thought to be remnants from the formation of the solar system.
Harold F. Levison +2 more
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A Two-Stage Formation Process for the Oort Comet Cloud and Its Implications
Astronomy and Astrophysics, 2008 Aims. The aim is to check whether the Nice model – which refers to an initially compact configuration of the giant planets that lasted for about 700 Myr and eventually became unstable when Jupiter and Saturn crossed their 2:1 mean motion resonance – is ...
Ramon Brasser
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Chaos in the Inert Oort Cloud [PDF]
Astronomy and Astrophysics, 2019 Context. Distant trans-Neptunian objects are subject to planetary perturbations and galactic tides. The former decrease with the distance, while the latter increase. In the intermediate regime where they have the same order of magnitude (the “inert Oort cloud”), both are weak, resulting in very long evolution ...
Marc Fouchard, Takashi Ito
exaly +5 more sources
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Scientific American, 1990
Although the outermost planet, Pluto, is 6 x 10 to the 9th km from the sun, the sun's gravitational sphere of influence extends much further, out to about 2 x 10 to the 13th km. This space is occupied by the Oort cloud, comprising 10 to the 12th-10 to the 13th cometary nuclei, formed in the primordial solar nebula.
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Although the outermost planet, Pluto, is 6 x 10 to the 9th km from the sun, the sun's gravitational sphere of influence extends much further, out to about 2 x 10 to the 13th km. This space is occupied by the Oort cloud, comprising 10 to the 12th-10 to the 13th cometary nuclei, formed in the primordial solar nebula.
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On the Stability of the Oort Cloud
Symposium - International Astronomical Union, 1972An attempt has been made to estimate the rate of destruction of the Oort cloud by stars passing through it. Two different mechanisms of cloud dispersion have been investigated. Numerical estimates show that the cumulative dispersing mechanism plays the leading role. The lower limit for the half-life of the cloud is 1.1 × 109 yr.
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The Mass Disruption of Oort Cloud Comets
Science, 2002We have calculated the number of dormant, nearly isotropic Oort cloud comets in the solar system by (i) combining orbital distribution models with statistical models of dormant comet discoveries by well-defined surveys and (ii) comparing the model results to observations of a population of dormant comets.
Harold F, Levison +5 more
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Icarus, 1988
Abstract A first generation model has been constructed to evaluate the importance of physical collisions between objects in the Oort cloud. While the collision rate is strongly dependent on the population structure of the Oort cloud, it is shown that natural power-law population structures produce significant numbers of collisions between each comet ...
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Abstract A first generation model has been constructed to evaluate the importance of physical collisions between objects in the Oort cloud. While the collision rate is strongly dependent on the population structure of the Oort cloud, it is shown that natural power-law population structures produce significant numbers of collisions between each comet ...
openaire +1 more source
Icarus, 2003
Abstract We detected CH4 in eight Oort cloud comets using high-dispersion (λ/Δλ∼2×104) infrared spectra acquired with CSHELL at NASA's IRTF and NIRSPEC at the W.M. Keck Observatory. The observed comets were C/1995 O1 (Hale–Bopp), C/1996 B2 (Hyakutake), C/1999 H1 (Lee), C/1999 T1 (McNaught–Hartley), C/1999 S4 (LINEAR), C/2000 WM1 (LINEAR), C/2001 A2 ...
E.L. Gibb +4 more
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Abstract We detected CH4 in eight Oort cloud comets using high-dispersion (λ/Δλ∼2×104) infrared spectra acquired with CSHELL at NASA's IRTF and NIRSPEC at the W.M. Keck Observatory. The observed comets were C/1995 O1 (Hale–Bopp), C/1996 B2 (Hyakutake), C/1999 H1 (Lee), C/1999 T1 (McNaught–Hartley), C/1999 S4 (LINEAR), C/2000 WM1 (LINEAR), C/2001 A2 ...
E.L. Gibb +4 more
openaire +1 more source