Results 31 to 40 of about 3,688 (211)

Morphology of Cometary Dust Coma and Tail [PDF]

International Astronomical Union Colloquium, 1996
AbstractThis paper summarizes some recent progress in our understanding of the morphological diversity of dust comets. This diversity is a product of dust emission from discrete active areas on the nucleus surface and provides information on the comet's rotation state and source function.
openaire   +1 more source

SPECIFIC FEATURES OF STRUCTURES IN THE INNER COMA OF COMET C/2017 T2 (PANSTARRS) AS OBSERVED WITH THE OMT-800 TELESCOPE OF THE ODESSA OBSERVATORY TELESCOPE NETWORK

Odessa Astronomical Publications, 2020
Observations of the comet were carried out using the OMT-800 telescope (the primary mirror diameter D = 80 cm; the focal length F = 214 cm) of the Odessa Observatory telescope network from January to June 2020.
V. V. Kleshchenok, S. G. Kashuba, S. M. Andrievsky, Yu. M. Gorbanev   +3 more
doaj   +1 more source

Physics of intact capture of cometary coma dust samples [PDF]

AIP Conference Proceedings, 2012
The physics of hypervelocity impact into foams are of interest because of application to comet dust capture during flyby encounters. Particles much larger than the foam cells behave as if the foam were a continuum, so that standard equations of fluid mechanics describe the effects of drag and ablation.
Anderson, W. W., Ahrens, Thomas
openaire   +2 more sources

Three-dimensional cometary dust coma modelling in the collisionless regime: strengths and weaknesses [PDF]

, 2007
Inverse coma and tail modelling of comets based on the method developed by Finson & Probstein is commonly used to analyse cometary coma images. Models of this type often contain a large number of assumptions that may not be constrained unless wide ...
Foster, M. J., Green, S. F.
core   +1 more source

Wide-field polarization imaging and numerical modeling of the coma and tail of comet C/2023 A3 (Tsuchinshan-ATLAS)

Astronomy & Astrophysics
Context. Imaging polarimetry enables the spatially resolved investigation of cometary dust properties across different morphological structures. While cometary comae have been studied thoroughly in the pertinent literature, cometary tails have remained ...
Arnaut M., Wöhler C., Halder P., Ahuja G., Ganesh S., Bhatt M.   +5 more
doaj   +1 more source

Kinetic simulation of neutral∕ionized gas and electrically charged dust in the coma of comet 67P∕Churyumov-Gerasimenko

, 2011
The cometary coma is a unique phenomenon in the solar system being a planetary atmosphere influenced by little or no gravity. As a comet approaches the sun, the water vapor with some fraction of other gases sublimate, generating a cloud of gas, ice and ...
Combi, Michael R., Tenishev, Valeriy, Martin Rubin, Valeriy Tenishev, Rubin, Martin, Michael R. Combi   +5 more
core   +1 more source

The Pre-perihelion Evolution of the Activity of Comet C/2017 K2 (Pan-STARRS) during the Water Ice-line Crossover

The Astronomical Journal
Comets, relics from the early solar system, consist of dust and ice. The ice sublimates as comets approach the Sun, ejecting dust from their nuclei seen as activity.
Yuna G. Kwon, Stefano Bagnulo, Johannes Markkanen, Ludmilla Kolokolova, Jessica Agarwal, Manuela Lippi, Zuri Gray   +6 more
doaj   +1 more source

Six Outbursts of Comet 46P/Wirtanen

The Planetary Science Journal, 2021
Cometary activity is a manifestation of sublimation-driven processes at the surface of nuclei. However, cometary outbursts may arise from other processes that are not necessarily driven by volatiles.
Michael S. P. Kelley, Tony L. Farnham, Jian-Yang Li, Dennis Bodewits, Colin Snodgrass, Johannes Allen, —, Eric C. Bellm, Michael W. Coughlin, Andrew J. Drake, Dmitry A. Duev, Matthew J. Graham, Thomas Kupfer, Frank J. Masci, Dan Reiley, Richard Walters, Zwicky Transient Facility Collaboration, M. Dominik, U. G. Jørgensen, A. E. Andrews, N. Bach-Møller, V. Bozza, M. J. Burgdorf, J. Campbell-White, S. Dib, Y. I. Fujii, T. C. Hinse, M. Hundertmark, E. Khalouei, P. Longa-Peña, M. Rabus, S. Rahvar, S. Sajadian, J. Skottfelt, J. Southworth, J. Tregloan-Reed, E. Unda-Sanzana, MiNDSTEp Collaboration   +37 more
doaj   +1 more source

Cometary Comae-Surface Links [PDF]

Space Science Reviews, 2020
AbstractA comet is a highly dynamic object, undergoing a permanent state of change. These changes have to be carefully classified and considered according to their intrinsic temporal and spatial scales. The Rosetta mission has, through its contiguous in-situ and remote sensing coverage of comet 67P/Churyumov-Gerasimenko (hereafter 67P) over the time ...
Raphael Marschall, Yuri Skorov, Vladimir Zakharov, Ladislav Rezac, Selina-Barbara Gerig, Chariton Christou, S. Kokou Dadzie, Alessandra Migliorini, Giovanna Rinaldi, Jessica Agarwal, Jean-Baptiste Vincent, David Kappel   +11 more
openaire   +4 more sources

Soil Loosening of Compacted Urban Tree Sites Using a Pneumatic Lance Injector: Quantifying Treatment Success Through Tree Morphology and Soil Structure Parameters via Terrestrial Laser Scanning

Journal of Plant Nutrition and Soil Science, EarlyView.
ABSTRACT Background Urban trees provide essential ecosystem services, but their growth and longevity are often limited by soil compaction. Although pneumatic lance injection (PLI) is increasingly promoted as a minimally invasive and efficient soil loosening technique, but robust scientific evidence for its long‐term effectiveness remains limited.
Oliver Löwe, Dominik Seidel, Katharina Weltecke, Thorsten Gaertig   +3 more
wiley   +1 more source