Results 11 to 20 of about 2,450 (224)
Breakup of a long-period comet as the origin of the dinosaur extinction
Scientific Reports, 2021 The origin of the Chicxulub impactor, which is attributed as the cause of the K/T mass extinction event, is an unsolved puzzle. The background impact rates of main-belt asteroids and long-period comets have been previously dismissed as being too low to ...
Amir Siraj, Abraham Loeb
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The Demographics of Long‐Period Comets [PDF]
The Astrophysical Journal, 2005 Accepted for publication in Astrophysical Journal.
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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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The Planetary Science Journal, 2023 We measured the chemical composition of comet C/2021 A1 (Leonard) using the long-slit echelle grating spectrograph iSHELL/IRTF on 2021 December 20 and on 2022 January 8 and 9.
Sara Faggi +3 more
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Galactic and stellar perturbations of long-period comet motion [PDF]
Astronomy & Astrophysics, 2022 Context. Thanks to our expanding knowledge of the Galactic and stellar neighborhood of the Solar System, modern long-period comet motion studies must take into account both stellar perturbations and the overall Galactic potential. Aims. Our aim is to propose algorithms and methods that aid in performing numerical integrations of equations of motion for
Piotr A. Dybczyński, Sławomir Breiter
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Study of a Man Riding a Bird in Daqa’iq al-Haqa’iq Nasir al-Din Muhammad al-Mu'azzim al-Haykali based on Panofsky’s Iconology Approach [PDF]
نگره, 2023 Mankind has always tried to achieve his desires by relying on occult sciences and the conquest of superior powers. This science has gone through a long history without any beginning date and no historical period has been excluded from it, because ...
Faeze Rezaee, Saeid Khoddari Naeeni
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ACTIVITY OF 50 LONG-PERIOD COMETS BEYOND 5.2 au [PDF]
The Astronomical Journal, 2016 ABSTRACT Remote investigations of ancient matter in the solar system have traditionally been carried out through observations of long-period (LP) comets, which are less affected by solar irradiation than their short-period counterparts orbiting much closer to the Sun. Here we summarize the results of our decade-long survey of the distant
K. Sárneczky +12 more
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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
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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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Open Astronomy, 2020 The hypothesis on the role of the meteoroid impacts in the comet nuclei splitting as well as acceleration of their heliocentric velocity are considered.
Guliyev Ayyub, Guliyev Rustam
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