Results 21 to 30 of about 296,727 (213)

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

, 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

On positively charged dust in the coma of comet 67P

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT Moment analysis of ion spectrograms measured by the Ion Composition Analyser (ICA) in the coma of comet 67P typically produces an ion number density estimate markedly lower than the number density of free electrons as measured by the Mutual Impedance Probe and the dual Langmuir Probe. While there are good reasons to distrust the
E Vigren, A I Eriksson, S Bergman
openaire   +1 more source

A composite phase function for cometary dust comae [PDF]

Planetary and Space Science
Comets are primitive planetesimals we can study to infer knowledge about the initial stages of formation of our Solar System. Dust is the largest mass component among cometary materials. Emitted dust particles are anysotropic scatterers of the incident solar light and their nature can be investigated with remote sensing studies. Among such studies, the
Ivano Bertini, Jean–Baptiste Vincent, Raphael Marschall, Fiorangela La Forgia, Alessandra Mura, Laura Inno, Stavro Ivanovski, Michael Küppers, Cecilia Tubiana, Vladimir Zakharov   +9 more
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Parameters of dust jets in comet Encke’s coma

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACTUsing 4412 positional observations, we compute eight single apparition orbits in the period 1993–2017. The analysis of the residuals of the orbit’s fit shows their systematic deviations around perihelia. We assume that these deviations in positional observations are a result of the dust emissions from a restricted area of the nucleus, and that ...
Yu Medvedev, Yu Chernetenko
openaire   +1 more source

Cometary coma dust size distribution from in situ IR spectra [PDF]

, 2017
Dust is the most abundant component in cometary comae. Here, we investigate the dust size distribution in 67P/Churyumov-Gerasimenko (67P/CG) using data from the Rosetta spacecraft that was in close proximity to the comet from 2014 August to 2016 ...
Erard S., C. Leyrat, Taylor, F., Erard, S., Ciarniello M., G. Filacchione, Taylor F., Filacchione G., Ciarniello, M., Della Corte, V., Rinaldi, G., Rotundi A., S. L. Ivanovski, M. Ciarniello, Capaccioni, F., Leyrat C., Rinaldi G., Bockelée-Morvan, D., Filacchione, G., Tozzi, G., Ivanovski, S., F. Capaccioni, S. Mottola, Fulle, M., S. Erard, D’aversa, E., Tozzi G. ~P., Capria M. ~T., Salatti M., Capria, M., Capaccioni F., Della Corte V., Ivanovski S. ~L. Bockel'ee-Morvan D., Salatti, M., Palomba E., M. Salatti, Longobardo, A., E. Palomba, V. Della Corte, A. Rotundi, Leyrat, C., Mottola S., F. Taylor, Rotundi, A., Mottola, S., E. D’Aversa, D'Aversa E., Palomba, E., M. Fulle, Longobardo A., M. T. Capria, G. Rinaldi, Fulle M., D. Bockelée-Morvan, G. P. Tozzi, A. Longobardo   +55 more
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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

A numerical model of cometary dust coma structures [PDF]

Astronomy and Astrophysics, 2010
Aims. The purpose of this study is to test our numerical model of cometary dust coma structures and to use the results to infer information about the nucleus surface activity of comet 9P/Tempel 1. Methods. Parameters on the activity were first estimated from simulations of ground-based observation acquired during the preperihelion period (January to ...
Vincent, J., Böhnhardt, H., Lara, L.
openaire   +2 more sources

The dust coma of Comet P/Giacobini-Zinner in the infrared

The Astronomical Journal, 1992
We present 1-20 micrometers photometry of P/Giacobini-Zinner obtained at the NASA Infrared Telescope Facility, during 1985 June-September (r = 1.57-1.03 AU). A broad, weak 10 micrometers silicate emission feature was detected on August 26.6; a similar weak emission feature could have been hidden in the broadband photometry on other dates.
M S, Hanner, G J, Veeder, A T, Tokunaga
openaire   +2 more sources

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

Modelling observations of the inner gas and dust coma of comet 67P/Churyumov-Gerasimenko using ROSINA/COPS and OSIRIS data: First results [PDF]

, 2016
Context. This paper describes the initial modelling of gas and dust data acquired in August and September 2014 from the European Space Agency’s Rosetta spacecraft when it was in close proximity to the nucleus of comet 67P/Churyumov-Gerasimenko.
Lai, I.L., H. U. Keller, Wu, J. S., Kuehrt, E., Su, C. C., A. Gracia-Berná, X. Shi, NALETTO, GIAMPIERO, Liao, Y., K. Altwegg, Thomas, Nicolas, M. Rubin, Jorda, L, W.-H. Ip, Marschall, Raphael, Keller, H. U., G. Naletto, Sierks, H., Scholten, F., E. Kührt, A. Gicquel, Gracia-Berná, A., Ip, W., Y. Liao, Shi, X., Lai, I. L., Liao, Ying, J. S. Wu, Naletto, G., Gracia Berná, A., Ip, W.-H., L. Jorda, I. L. Lai, Vincent, J.-B., F. Scholten, Scholten, Frank, Vincent, J.B., Altwegg, Kathrin, R. Marschall, Jorda, L., Knollenberg, J., Preusker, F., Thomas, N., Ip, W. H., Vincent, J., Kührt, E., C. C. Su, Ip, W. -H., Y. Skorov, H. Sierks, Lai, I., Keller, H., J.-B. Vincent, Marschall, R., F. Preusker, Vincent, J. -B., Su, C., Ip, W-H., Wu, J.S., Gicquel, A., Wu, J., Preusker, Frank, Vincent, J. B., N. Thomas, Skorov, Y., Rubin, Martin, Altwegg, K., Su, C.C., J. Knollenberg, Rubin, M.   +69 more
core   +2 more sources