3.3.3.7 The nature of cometary dust

2005 ◽  
pp. 178-179
Author(s):  
J. Rahe ◽  
V. Vanysek
Keyword(s):  
Cometary Dust

scholarly journals Experimental Results on Scattering by Irregular and Meteoritic Dust Particles Related to Photopolarimetry of Zodiacal Light and Comets

1985 ◽  
Vol 85 ◽  
pp. 223-226
Author(s):  
K. Weiss-Wrana ◽  
R.H. Giese ◽  
R.H. Zerull
Keyword(s):  
Light Scattering ◽  
Size Range ◽  
Experimental Results ◽  
Dust Particles ◽  
Dust Grains ◽  
Scattering Function ◽  
Negative Polarization ◽  
Zodiacal Light ◽  
Cometary Dust ◽  
Characteristic Features

AbstractThe investigations of light scattering by larger meteoritic and terrestrial single grains (size range 20 μm to 120 μm ) demonstrate that the scattering properties of irregularly shaped dark opaque particles with very rough surfaces resemble the characteristic features of the empirical scattering function as derived from measurements of the zodiacal light. Purely transparent or translucent irregularly shaped particles show a quite different scattering behaviour. Furthermore irregular and multicomponent fluffy particles in the size range of a few microns were modelled by microwave analog measurements in order to explain positive and negative polarization of the light scattered by cometary dust grains.

scholarly journals Ultraviolet Albedo of Comet West (1976 VI)

1980 ◽  
Vol 90 ◽  
pp. 263-266
Author(s):  
P. D. Feldman
Keyword(s):  
Solar Radiation ◽  
Solar Spectrum ◽  
Ultraviolet Spectrum ◽  
The Moon ◽  
Lunar Dust ◽  
Cometary Dust ◽  
A Value ◽  
Dust Coma ◽  
Spectrometer Slit ◽  
The Continuum

The ultraviolet spectrum of Comet West (1976 VI) in the range 1200-3200 Å was recorded by rocket-borne instruments on March 5.5, 1976. At the time of launch, r = 0.385, Δ = 0.84 and the phase angle was 78°. Longward of 2100 Å the continuum of solar radiation scattered by cometary dust is detected and is found to closely follow the solar spectrum. Since the dust coma is completely included in the spectrometer slit, the ultraviolet albedo can be determined relative to the visible and this ratio is found to be ≈0.3 at 2700 Å. There is evidence for a further decrease in albedo near 2200 Å. Using a visible albedo of 0.2 gives a value of 0.06 for the cometary albedo at 2700 Å, a value similar to that found for the moon and lunar dust in this spectral region.

scholarly journals Dust in the Solar System

1989 ◽  
Vol 44 (10) ◽  
pp. 877-882 ◽  
Author(s):  
H. Fechtig
Keyword(s):  
Solar Irradiation ◽  
Dust Particles ◽  
Normal Density ◽  
Dust Grains ◽  
Cometary Dust ◽  
In Situ Experiments ◽  
Asteroidal Belt ◽  
Comet Halley ◽  
Cometary Origin

Abstract Properties of cometary dust particles are better known since the space missions to Comet Halley. Their properties (densities, atomic composition) are compared with relevant observations from lunar microcraters and in-situ experiments. At 1 AU in the eliptic, 2/3 of the dust grains are normal density particles, presumably of asteroidal origin and irregularly shaped, while the remaining 1/3 are low density particles, presumably of cometary origin, but due to solar irradiation in a processed state (corresponding to “Brownlee”-particles). Beyond the asteroidal belt only black cometary dust grains are observed which have recently been released from comet nuclei orbiting on highly eccentric trajectories.

Temperature of cometary dust

1988 ◽  
Vol 41 (2) ◽  
pp. 197-200
Author(s):  
Th. Henning ◽  
U. Weidlich
Keyword(s):  
Cometary Dust

Mass Erosion and Transport on Cometary Nuclei, as Found on 67P/Churyumov-Gerasimenko

2021 ◽  
Author(s):  
Wing-Huen Ip
Keyword(s):  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Ballistic Transport ◽  
Dust Grains ◽  
Cometary Nuclei ◽  
Cometary Dust ◽  
Physical Mechanisms ◽  
Streaming Instability ◽  
System P ◽  
Nucleus Surface

The Rosetta spacecraft rendezvoused with comet 67P/Churyumov-Gerasimenko in 2014–2016 and observed its surface morphology and mass loss process. The large obliquity (52°) of the comet nucleus introduces many novel physical effects not known before. These include the ballistic transport of dust grains from the southern hemisphere to the northern hemisphere during the perihelion passage, thus shaping the dichotomy of two sides, with the northern hemisphere largely covered by dust layers from the recycled dusty materials (back fall) and the southern hemisphere consisting mostly of consolidated terrains. A significant amount of surface material up to 4–10 m in depth could be transferred across the nucleus surface in each orbit. New theories of the physical mechanisms driving the outgassing and dust ejection effects are being developed. There is a possible connection between the cometary dust grains and the fluffy aggregates and pebbles in the solar nebula in the framework of the streaming-instability scenario. The Rosetta mission thus succeeded in fulfilling one of its original scientific goals concerning the origin of comets and their relation to the formation of the solar system.

An Easy-to-Use Model for the Optical Thickness and Ambient Illumination within Cometary Dust Comae

2002 ◽  
pp. 99-108
Author(s):  
Michael Müller ◽  
Simon F. Green ◽  
Neil Mcbride
Keyword(s):  
Optical Thickness ◽  
Ambient Illumination ◽  
Cometary Dust

On the Orbit Mechanics of Cometary Dust Particles

1979 ◽  
pp. 307-310
Author(s):  
H. Kimura
Keyword(s):  
Dust Particles ◽  
Cometary Dust

On the Organic Refractory Component of Cometary Dust

1999 ◽  
pp. 109-114
Author(s):  
Marina N. Fomenkova
Keyword(s):  
Refractory Component ◽  
Cometary Dust
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