Results 21 to 30 of about 2,956 (261)
Early long-period comets: their discovery and flux [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 By analysing recent comet catalogues, it is found that the flux of long-period comets to the inner solar system has been reasonably constant throughout the last two millennia. There is no evidence of periods of enhanced activity, or comet showers. The acuity of northern hemisphere naked-eye observers throughout the era of pre-telescopic astronomy was ...
David W Hughes, Hughes David W
exaly +2 more sources
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 ...
Rickman, Hans,
openaire +2 more sources
The activity characteristics and mechanisms of long-period comets
Earth and Planetary PhysicsComets are small celestial bodies orbiting around the Sun. They are remnants left over from the formation of the solar system; their interiors store original material of the planetary disk within the solar system. They are thus "fossils" for studying the
YingQi Wu +3 more
doaj +2 more sources
The Effect of Dwarf’s Planets Pluto and Eris upon Long Period Comets
Journal of Kufa-Physics, 2017 The orbit of long period comets overlapped with that of dwarf’s planet Pluto and Eris. The gravitational effects arise from dwarf’s planets as well as the eight planets have been involved in orbits calculations.
Hayder Hasan Jawad
doaj +1 more source
CO and CO2 Productions Rates of Comets Observed by NEOWISE within Year 1 of the Reactivated Mission
The Planetary Science Journal, 2023 We report on the observed fluxes of the comets detected by NEOWISE during the first year of operations after the spacecraft’s reactivation. The sample included 57 comets.
Adeline Gicquel +4 more
doaj +1 more source
Origin and Evolution of Long-period Comets [PDF]
The Astronomical Journal, 2019 Abstract We develop an evolutionary model of the long-period comet (LPC) population, starting from their birthplace in a massive trans-Neptunian disk that was dispersed by migrating giant planets. Most comets that remain bound to the solar system are stored in the Oort cloud.
David Vokrouhlický +2 more
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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
openaire +3 more sources
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source