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Your search keyword '"Kolokolova, L."' showing total 24 results
Start Over Author "Kolokolova, L." Publisher edp sciences
24 results on '"Kolokolova, L."'

2. Photometry, spectroscopy, and polarimetry of distant comet C/2014 A4 (SONEAR)

Author

Ivanova, O., Luk’yanyk, I., Kolokolova, L., Das, H. S., Husárik, M., Rosenbush, V., Afanasiev, V., Svoren, J., Kiselev, N., Krushinsky, V., Ivanova, O., Luk’yanyk, I., Kolokolova, L., Das, H. S., Husárik, M., Rosenbush, V., Afanasiev, V., Svoren, J., Kiselev, N., and Krushinsky, V.

Abstract

Context. The study of distant comets, which are active at large heliocentric distances, is important for a better understanding of their physical properties and mechanisms of long-lasting activity. Aims. We analyzed the dust environment of the distant comet C/2014 A4 (SONEAR), with a perihelion distance near 4.1 au, using comprehensive observations obtained by different methods. Methods. We present an analysis of spectroscopy, photometry, and polarimetry of comet C/2014 A4 (SONEAR), which were performed on November 5–7, 2015, when its heliocentric distance was 4.2 au and phase angle was 4.7◦. Long-slit spectra and photometric and linear polarimetric images were obtained using the focal reducer SCORPIO-2 attached to the prime focus of the 6 m telescope BTA (SAO RAS, Russia). We simulated the behavior of color and polarization in the coma presenting the cometary dust as a set of polydisperse polyshapes rough spheroids. Results. No emission features were detected in the 3800–7200 Å wavelength range. The continuum showed a reddening effect with the normalized gradient of reflectivity 21.6 ± 0.2% per 1000 Å within the 4650–6200 Å wavelength region. The fan-like structure in the sunward hemisphere was detected. The radial profiles of surface brightness differ for r-sdss and g-sdss filters, indicating a predominance of submicron and micron-sized particles in the cometary coma. The dust color (g–r) varies from 0.75 ± 0.05m to 0.45 ± 0.06m along the tail. For an aperture radius near 20 000 km, the dust productions in various filters were estimated as Afρ = 680 ± 18 cm (r-sdss) and 887 ± 16 cm (g-sdss). The polarization map shows spatial variations in polarization over the coma from about −3% near the nucleus to −8% at a cometocentric distance of about 150 000 km. Our simulations show that the dust particles are dominated (or covered) by ice and tholin-like organics. Spatial changes in the color and polarization can be explained by particle fragmentation. © ESO 2019.

Published
2019

3. Phase-curve analysis of comet 67P/Churyumov-Gerasimenko at small phase angles

Author

Masoumzadeh, N., Kolokolova, L., Tubiana, C., El-Maarry, M. R., Mottola, S., Güttler, C., Snodgrass, C, Sierks, H., Naletto, G., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Davidsson, B., Barucci, M.A., Bertaux, J.L., Bertini, I., Bodewits, D., Cremonese, G., Da Deppo, Vania, Debei, S., De Cecco, M., Deller, J., Fornasier, S., Fulle, M., Gutiérrez, Pedro J., Hasselmann, P.H., Ip, W. H., Keller, H.U., Lara, Luisa María, Lazzarin, M., López-Moreno, José Juan, Marzari, F., Shi, X., Toth, I., Masoumzadeh, N., Kolokolova, L., Tubiana, C., El-Maarry, M. R., Mottola, S., Güttler, C., Snodgrass, C, Sierks, H., Naletto, G., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Davidsson, B., Barucci, M.A., Bertaux, J.L., Bertini, I., Bodewits, D., Cremonese, G., Da Deppo, Vania, Debei, S., De Cecco, M., Deller, J., Fornasier, S., Fulle, M., Gutiérrez, Pedro J., Hasselmann, P.H., Ip, W. H., Keller, H.U., Lara, Luisa María, Lazzarin, M., López-Moreno, José Juan, Marzari, F., Shi, X., and Toth, I.

Abstract

The Rosetta-OSIRIS images acquired at small phase angles in three wavelengths during the fly-by of the spacecraft on 9-10 April 2016 provided a unique opportunity to study the opposition effect on the surface of comet 67P/Churyumov-Gerasimenko (67P). Our goal is to study phase curves of the nucleus at small phase angles for a variety of surface structures to show the differences in their opposition effect and to determine which surface properties cause the differences.© N. Masoumzadeh et al. 2019

Published
2019

4. Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta

Author

Agenzia Spaziale Italiana, German Research Foundation, Centre National de la Recherche Scientifique (France), Ministerio de Economía y Competitividad (España), Government of Sweden, European Space Agency, l'Observatoire de Paris, Science and Technology Facilities Council (UK), Tubiana, C., Rinaldi, G., Güttler, C., Snodgrass, C, Shi, X., Hu, X., Marschall, R., Fulle, M., Bockelée-Morvan, D., Naletto, G., Capaccioni, F, Sierks, H., Arnold, G., Barucci, M.A., Bertaux, J.L., Bertini, I., Bodewits, D., Capria, MT, Ciarniello, M, Cremonese, G., Crovisier, J, Da Deppo, Vania, Debei, S., De Cecco, M., Deller, J., De Sanctis, MC, Davidsson, B., Doose, L, Erard, S, Filacchione, G., Fink, U, Formisano, M, Fornasier, S., Gutiérrez, Pedro J., Ip, W. H., Ivanovski, S., Kappel, D, Keller, H.U., Kolokolova, L., Koschny, D., Krueger, H, La Forgia, F., Lamy, P.L., Lara, Luisa María, Lazzarin, M., Levasseur-Regourd, A. C., Lin, Zhong-Yi, Longobardo, A, López-Moreno, José Juan, Marzari, F., Migliorini, A, Mottola, S., Rodrigo Montero, Rafael, Taylor, F, Toth, I., Zakharov, V, Agenzia Spaziale Italiana, German Research Foundation, Centre National de la Recherche Scientifique (France), Ministerio de Economía y Competitividad (España), Government of Sweden, European Space Agency, l'Observatoire de Paris, Science and Technology Facilities Council (UK), Tubiana, C., Rinaldi, G., Güttler, C., Snodgrass, C, Shi, X., Hu, X., Marschall, R., Fulle, M., Bockelée-Morvan, D., Naletto, G., Capaccioni, F, Sierks, H., Arnold, G., Barucci, M.A., Bertaux, J.L., Bertini, I., Bodewits, D., Capria, MT, Ciarniello, M, Cremonese, G., Crovisier, J, Da Deppo, Vania, Debei, S., De Cecco, M., Deller, J., De Sanctis, MC, Davidsson, B., Doose, L, Erard, S, Filacchione, G., Fink, U, Formisano, M, Fornasier, S., Gutiérrez, Pedro J., Ip, W. H., Ivanovski, S., Kappel, D, Keller, H.U., Kolokolova, L., Koschny, D., Krueger, H, La Forgia, F., Lamy, P.L., Lara, Luisa María, Lazzarin, M., Levasseur-Regourd, A. C., Lin, Zhong-Yi, Longobardo, A, López-Moreno, José Juan, Marzari, F., Migliorini, A, Mottola, S., Rodrigo Montero, Rafael, Taylor, F, Toth, I., and Zakharov, V

Abstract

On 27 April 2015, when comet 67P/Churyumov-Gerasimenko was at 1.76 au from the Sun and moving toward perihelion, the OSIRIS and VIRTIS-M instruments on board the Rosetta spacecraft simultaneously observed the evolving dust and gas coma during a complete rotation of the comet.© C. Tubiana et al. 2019

Published
2019

5. Phase-curve analysis of comet 67P/Churyumov-Gerasimenko at small phase angles

Author

Masoumzadeh, N, primary, Kolokolova, L, additional, Tubiana, C, additional, El-Maarry, M. R., additional, Mottola, S, additional, Güttler, C., additional, Snodgrass, C, additional, Sierks, H., additional, Naletto, G., additional, Lamy, P. L., additional, Rodrigo, R., additional, Koschny, D, additional, Davidsson, B, additional, Barucci, M. A., additional, Bertaux, J.-L., additional, Bertini, I, additional, Bodewits, D., additional, Cremonese, G, additional, Da Deppo, V., additional, Debei, S., additional, De Cecco, M., additional, Deller, J., additional, Fornasier, S., additional, Fulle, M, additional, Gutiérrez, P. J., additional, Hasselmann, P. H., additional, Ip, W.-H., additional, Keller, H. U., additional, Lara, L. M., additional, Lazzarin, M, additional, López-Moreno, J. J., additional, Marzari, F, additional, Shi, X, additional, and Toth, I, additional

Published
2019
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6. Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta

Author

Tubiana, C., primary, Rinaldi, G., additional, Güttler, C., additional, Snodgrass, C., additional, Shi, X., additional, Hu, X., additional, Marschall, R., additional, Fulle, M., additional, Bockelée-Morvan, D., additional, Naletto, G., additional, Capaccioni, F., additional, Sierks, H., additional, Arnold, G., additional, Barucci, M. A., additional, Bertaux, J.-L., additional, Bertini, I., additional, Bodewits, D., additional, Capria, M. T., additional, Ciarniello, M., additional, Cremonese, G., additional, Crovisier, J., additional, Da Deppo, V., additional, Debei, S., additional, De Cecco, M., additional, Deller, J., additional, De Sanctis, M. C., additional, Davidsson, B., additional, Doose, L., additional, Erard, S., additional, Filacchione, G., additional, Fink, U., additional, Formisano, M., additional, Fornasier, S., additional, Gutiérrez, P. J., additional, Ip, W.-H., additional, Ivanovski, S., additional, Kappel, D., additional, Keller, H. U., additional, Kolokolova, L., additional, Koschny, D., additional, Krueger, H., additional, La Forgia, F., additional, Lamy, P. L., additional, Lara, L. M., additional, Lazzarin, M., additional, Levasseur-Regourd, A. C., additional, Lin, Z.-Y., additional, Longobardo, A., additional, López-Moreno, J. J., additional, Marzari, F., additional, Migliorini, A., additional, Mottola, S., additional, Rodrigo, R., additional, Taylor, F., additional, Toth, I., additional, and Zakharov, V., additional

Published
2019
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7. Opposition effect on comet 67P/Churyumov-Gerasimenko using Rosetta-OSIRIS images

Author

Swedish National Space Board, Ministerio de Economía y Competitividad (España), Agenzia Spaziale Italiana, Centre National de la Recherche Scientifique (France), German Centre for Air and Space Travel, European Space Agency, Masoumzadeh, N., Oklay, N., Kolokolova, L., Sierks, H., Fornasier, S., Barucci, M.A., Vincent, J.B., Tubiana, C., Güttler, C., Preusker, F., Scholten, F., Mottola, S., Hasselmann, P.H., Feller, C., Barbieri, C., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Rickman, H., A'Hearn, M. F., Bertaux, J.L., Bertini, I., Cremonese, G., Da Deppo, Vania, Davidsson, Björn J. R., Debei, S., De Cecco, M., Fulle, M., Gicquel, A., Groussin, O., Gutiérrez, Pedro J., Hall, I., Hofmann, M., Hviid, S.F., Ip, W. H., Jorda, L., Keller, H.U., Knollenberg, J., Kovacs, G., Kramm, J.R., Kührt, E., Küppers, M., Lara, Luisa María, Lazzarin, M., López-Moreno, José Juan, Marzari, F., Naletto, G., Shi, X., Thomas, N., Swedish National Space Board, Ministerio de Economía y Competitividad (España), Agenzia Spaziale Italiana, Centre National de la Recherche Scientifique (France), German Centre for Air and Space Travel, European Space Agency, Masoumzadeh, N., Oklay, N., Kolokolova, L., Sierks, H., Fornasier, S., Barucci, M.A., Vincent, J.B., Tubiana, C., Güttler, C., Preusker, F., Scholten, F., Mottola, S., Hasselmann, P.H., Feller, C., Barbieri, C., Lamy, P.L., Rodrigo Montero, Rafael, Koschny, D., Rickman, H., A'Hearn, M. F., Bertaux, J.L., Bertini, I., Cremonese, G., Da Deppo, Vania, Davidsson, Björn J. R., Debei, S., De Cecco, M., Fulle, M., Gicquel, A., Groussin, O., Gutiérrez, Pedro J., Hall, I., Hofmann, M., Hviid, S.F., Ip, W. H., Jorda, L., Keller, H.U., Knollenberg, J., Kovacs, G., Kramm, J.R., Kührt, E., Küppers, M., Lara, Luisa María, Lazzarin, M., López-Moreno, José Juan, Marzari, F., Naletto, G., Shi, X., and Thomas, N.

Abstract

Aims. We aim to explore the behavior of the opposition effect as an important tool in optical remote sensing on the nucleus of comet 67P/Churyumov-Gerasimenko (67P), using Rosetta-OSIRIS images acquired in different filters during the approach phase, July-August 2014 and the close flyby images on 14 of February 2015, which contain the spacecraft shadow. Methods. We based our investigation on the global and local brightness from the surface of 67P with respect to the phase angle, also known as phase curve. The local phase curve corresponds to a region that is located at the Imhotep-Ash boundary of 67P. Assuming that the region at the Imhotep-Ash boundary and the entire nucleus have similar albedo, we combined the global and local phase curves to study the opposition-surge morphology and constrain the structure and properties of 67P. The model parameters were furthermore compared with other bodies in the solar system and existing laboratory study. Results. We found that the morphological parameters of the opposition surge decrease monotonically with wavelength, whereas in the case of coherent backscattering this behavior should be the reverse. The results from comparative analysis place 67P in the same category as the two Mars satellites, Phobos and Deimos, which are notably different from all airless bodies in the solar system. The similarity between the surface phase function of 67P and a carbon soot sample at extremely small angles is identified, introducing regolith at the boundary of the Imhotep-Ash region of 67P as a very dark and fluffy layer.© ESO, 2017.

Published
2017

8. Opposition effect on comet 67P/Churyumov-Gerasimenko using Rosetta-OSIRIS images

Author

Masoumzadeh, N., primary, Oklay, N., additional, Kolokolova, L., additional, Sierks, H., additional, Fornasier, S., additional, Barucci, M. A., additional, Vincent, J.-B., additional, Tubiana, C., additional, Güttler, C., additional, Preusker, F., additional, Scholten, F., additional, Mottola, S., additional, Hasselmann, P. H., additional, Feller, C., additional, Barbieri, C., additional, Lamy, P. L., additional, Rodrigo, R., additional, Koschny, D., additional, Rickman, H., additional, A’Hearn, M. F., additional, Bertaux, J.-L., additional, Bertini, I., additional, Cremonese, G., additional, Da Deppo, V., additional, Davidsson, B. J. R., additional, Debei, S., additional, De Cecco, M., additional, Fulle, M., additional, Gicquel, A., additional, Groussin, O., additional, Gutiérrez, P. J., additional, Hall, I., additional, Hofmann, M., additional, Hviid, S. F., additional, Ip, W.-H., additional, Jorda, L., additional, Keller, H. U., additional, Knollenberg, J., additional, Kovacs, G., additional, Kramm, J.-R., additional, Kührt, E., additional, Küppers, M., additional, Lara, L. M., additional, Lazzarin, M., additional, Lopez Moreno, J. J., additional, Marzari, F., additional, Naletto, G., additional, Shi, X., additional, and Thomas, N., additional

Published
2017
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17. Dust observations of Comet 9P/Tempel 1 at the time of the Deep Impact

Author

Tozzi, G. P., primary, Boehnhardt, H., additional, Kolokolova, L., additional, Bonev, T., additional, Pompei, E., additional, Bagnulo, S., additional, Ageorges, N., additional, Barrera, L., additional, Hainaut, O., additional, Käufl, H. U., additional, Kerber, F., additional, LoCurto, G., additional, Marco, O., additional, Pantin, E., additional, Rauer, H., additional, Saviane, I., additional, Sterken, C., additional, and Weiler, M., additional

Published
2007
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24. Opposition effect on comet 67P/Churyumov-Gerasimenko using Rosetta-OSIRIS images

Author

Davidsson, B. J. R., Feller, C., Tubiana, C., Preusker, F., Keller, H. U., Bertini, I., Barucci, M. A., Lopez Moreno, J. J., Sierks, H., Kolokolova, L., Rickman, H., Knollenberg, J., Barbieri, C., Thomas, Nicolas, Shi, X., Marzari, F., Fornasier, S., Debei, S., Hviid, S. F., Scholten, F., Lazzarin, M., De Cecco, M., Cremonese, G., Fulle, M., Kramm, J.-R., Masoumzadeh, N., Bertaux, J.-L., Jorda, L., Mottola, S., Rodrigo, Rafael, Gicquel, A., Da Deppo, V., Küppers, M., Kührt, E., A’Hearn, M. F., Hall, I., Hofmann, M., Vincent, J.-B., Lamy, P. L., Lara, L. M., Naletto, G., Oklay, N., Groussin, O., Koschny, D., Gutiérrez, P. J., Kovacs, G., Ip, W.-H., Güttler, C., and Hasselmann, P. H.

Subjects
13. Climate action, 520 Astronomy, 620 Engineering
Abstract

We aim to explore the behavior of the opposition effect as an important tool in optical remote sensing on the nucleus of comet 67P/Churyumov-Gerasimenko (67P), using Rosetta-OSIRIS images acquired in different filters during the approach phase, July-August 2014 and the close flyby images on 14 of February 2015, which contain the spacecraft shadow. Methods. We based our investigation on the global and local brightness from the surface of 67P with respect to the phase angle, also known as phase curve. The local phase curve corresponds to a region that is located at the Imhotep-Ash boundary of 67P. Assuming that the region at the Imhotep-Ash boundary and the entire nucleus have similar albedo, we combined the global and local phase curves to study the opposition-surge morphology and constrain the structure and properties of 67P. The model parameters were furthermore compared with other bodies in the solar system and existing laboratory study. Results. We found that the morphological parameters of the opposition surge decrease monotonically with wavelength, whereas in the case of coherent backscattering this behavior should be the reverse. The results from comparative analysis place 67P in the same category as the two Mars satellites, Phobos and Deimos, which are notably different from all airless bodies in the solar system. The similarity between the surface phase function of 67P and a carbon soot sample at extremely small angles is identified, introducing regolith at the boundary of the Imhotep-Ash region of 67P as a very dark and fluffy layer.

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