Results 21 to 30 of about 33,036 (248)
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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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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3 - 14 Micron Spectroscopy of Comets C/2002 O4 (Honig), C/2002 V1 (NEAT), C/2002 X5 (Kudo-Fujikawa), C/2002 Y1 (Juels-Holvorcem), 69P/Taylor, and the Relationships among Grain Temperature, Silicate Band Strength and Structure among Comet Families [PDF]
, 2004 We report 3 - 13 micron spectroscopy of 4 comets observed between August 2002 and February 2003: C/2002 O4 (Honig) on August 1, 2002, C/2002 V1 (NEAT) on Jan. 9 and 10, 2003, C/2002 X5 (Kudo-Fujikawa) on Jan.
Beust H. +12 more
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Complex organic molecules in comets C/2012 F6 (Lemmon) and C/2013 R1 (Lovejoy): detection of ethylene glycol and formamide [PDF]
, 2014 A spectral survey in the 1 mm wavelength range was undertaken in the long-period comets C/2012 F6 (Lemmon) and C/2013 R1 (Lovejoy) using the 30 m telescope of the Institut de radioastronomie millim\'etrique (IRAM) in April and November-December 2013.
Biver, N. +11 more
core +5 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 ...
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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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Long Dust Trails of Short Period Comets [PDF]
International Astronomical Union Colloquium, 1991 Comets constitute an important source for the zodiacal dust cloud. Mainly large particles are contributed because the smaller particles are emitted into hyperbolic orbits relative to the sun. Radiation pressure force reduces the effective solar gravitational attraction. Information about large cometary particles can be derived from a variety of sources
H. U. Keller, K. Richter
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Periodontology 2000, EarlyView., 2023 Abstract Periodontitis is a long‐term condition affecting up to half of the population globally and causing significant impacts on life quality. Successful management depends on taking life‐long ownership of the condition by those affected. There is a wealth of research to inform on management options. However, most of the research has been designed by
Ian Needleman +3 more
wiley +1 more source
The Astrophysical Journal Supplement SeriesWe present the first results from the Cometary Object Study Investigating their Nature and Evolution (COSINE) project, based on a uniformly processed data set of 484 comets observed over the full 15 yr duration of the Wide-field Infrared Survey Explorer (
Yuna G. Kwon +10 more
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