Results 11 to 20 of about 337,815 (176)

Dust shells and dark linear structures on dust tails of historical and recent long-period comets [PDF]

Astronomy & Astrophysics
Context. Dust halos or shells, along with linear dark structures along the axes of dust tails, are commonly observed in many long- period comets near perihelion. Examples range from the recent C/2023 A3 (Tsuchinshan-ATLAS) to historical comets such as the Great Comet of 1874, C/1874 H1 (Coggia). Aims.
Fernando Moreno, Emmanuel Jehin
openaire   +4 more sources

Investigating the Composition of Listeria actin Comet Tails [PDF]

, 2022
Several intracellular bacterial pathogens, including Listeria monocytogenes (Lm), can colonizethe cytosol of host cells during infection. Cytosolic Lm then hijacks the host cells’ actin polymerization machinery using ActA to recruit the host Arp2/3 ...
Viernes, Clandestine
core   +1 more source

The formation of striated structures in dust tails of comets [PDF]

Astronomical School’s Report, 2012
The mechanism of formation of striae structures in the dust tails of comets is proposed. There are local active areas on the surfaces of comet nucleus. The formation of striae is indebted to the different rate of dust ejection from active areas depending on that they are located on the sunlit or shaded side of the rotating nucleus.
S. V. Kharchuk, P. P. Korsun
openaire   +2 more sources

Observations of a dust tail gap in comet C/2014 Q1 (PanSTARRS) [PDF]

, 2022
Cometary dust tails display a wide array of structures, most believed to be caused by a variable dust production, size distributions, fragmentation processes, and interactions with the solar wind, e.g. Price et al. (2019).
Jones, Geraint H, Afghan, Qasim, Coates, Andrew, Price, Oliver   +3 more
core   +1 more source

Thermal model of water and CO activity of Comet C/1995 O1 (Hale-Bopp) [PDF]

, 2011
An investigation of the activity of Comet C/1995 O1 (Hale-Bopp) with a thermophysical nucleus model that does not rely on the existence of amorphous ice is presented.
H.U. Keller, U. Motschmann, N. Gortsas, Kührt, Ekkehard, Kührt, E., Gortsas, N., Keller, H.U., E. Kührt, Motschmann, U.   +8 more
core   +1 more source

DISC - the dust impact sensor and counter on-board Comet Interceptor: Characterization of the dust coma of a dynamically new comet [PDF]

, 2023
The Comet Interceptor space mission, selected by ESA in June 2019 as the first F-Class mission, will study a dynamically new comet or an interstellar object by a unique multi-point 'snapshot' measurement.
Ferraioli G., Mazzotta-Epifani E., Amoroso M., Della Corte V., Fiscale S., Tonietti L., Di Donato P., Sindoni G., Piccirillo A. M., Di Paolo F., Bertini I., Patel M. R., Wozniakiewicz P. J., Zakharov V., Burchell M. J., Inno L., Rotundi A., Alesbrook L. A., Ferretti S., Rothkaehl H., Sylvest M. E., Longobardo A., Ammannito E., Fulle M., Muscari Tomajoli M. T.   +24 more
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The dust tail of Comet Wilson 1987VII

The Astronomical Journal, 1990
The dust and plasma tails of Comet Wilson 1987VII were studied using photographic plates obtained by means of an ESO Schmidt camera. The plates were digitized adopting a square scanning window of 50 microns and properly calibrated by means of calibration wedges. Dust grains of diameters between 10 microns and 5 cm, ejected during the time interval -600
G. Cremonese, M. Fulle
openaire   +1 more source

The dust tail of Comet C/1999 T1 McNaught-Hartley [PDF]

Astronomy & Astrophysics, 2003
A numerical method to compute cometary dust tail brightnesses has been developed. The method, analogous in many ways to the inverse Monte Carlo method proposed by Fulle ([CITE]), has been applied to red continuum images of comet C/1999 T1 McNaught-Hartley obtained by Lara et al. ([CITE]). The time and size dependence of the particle terminal velocities,
F. Moreno, L. M. Lara, J. J. López-Moreno, O. Muñoz, A. Molina, J. Licandro   +5 more
openaire   +1 more source

Fine Scale Structure in Cometary Dust Tails [PDF]

, 2022
Cometary dust tails often contain particularly striking fine structure. Unexplained alone by bulk dust properties, features such as the highly notable striae form due to as-yet unconstrained processes.
Price, Oliver Duncan
core   +1 more source

Prospects for the In Situ detection of Comet C/2019 Y4 ATLAS by Solar Orbiter [PDF]

, 2020
The European Space Agency's Solar Orbiter spacecraft will pass approximately downstream of the position of comet C/2019 Y4 (ATLAS) in late May and early June 2020.
Price, O, Afghan, Q, Jones, GH
core   +1 more source