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The Dust Coma of Comet C/1999 S4 (Linear)
Earth, Moon and Planets, 2002Comet C/1999 S4 (LINEAR) showed a very special behaviour between 28 June and 1 July 2000. Optical observations of the dust coma in two distinct continuum bands revealed that it changed morphologically as well as in colour. The two-dimensional coma morphology indicates a splitting of the nucleus which probably occurred shortly before the observations of
Rita Schulz, Joachim A. Stüwe
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Light scattering in cometary dust comae
Earth, Moon, and Planets, 1987Single and multiple scattering calculations were performed for a spherically symmetric cometary atmosphere irradiated by a plane parallel source. It is suggested that the increased flux found for anisotropic phase functions is due to the effect of directional scattering in the forward sun-comet axis. The isotropic multiply scattered flux at the surface
Gary Herman, Heikki Salo
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Gas and Dust Jets in the Inner Coma of Comet Halley
Nature, 1988Cyanogen (CN) jets were discovered in comet Halley by applying an image processing ring masking technique to ground-based observations1,2. We now report the detection of dust, C2, C3, CN and ([O I] + NH2) jet features in comet Halley during the period of the spacecraft Giotto encounter (13–18 March 1986).
Wing-Huen Ip
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2008
Analytical expressions for the dust entrainment in the limits of low and high gas production from cometary nuclei are derived. The resulting volume density is used to evaluate the dust production of Comets Encke and Kohoutek from IR-measurements. It is predicted, that the dust in solar direction was diffuse for Comet Kohoutek during approach to the Sun,
K. W. Michel, T. Nishimura
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Analytical expressions for the dust entrainment in the limits of low and high gas production from cometary nuclei are derived. The resulting volume density is used to evaluate the dust production of Comets Encke and Kohoutek from IR-measurements. It is predicted, that the dust in solar direction was diffuse for Comet Kohoutek during approach to the Sun,
K. W. Michel, T. Nishimura
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Carbonaceous matter in cometary dust and coma
Advances in Space Research, 1995The analysis of carbonaceous matter in p/Halley's dust and coma via mass spectrometry of positive ions is reviewed. Dust impact generated ions were analyzed by the PUMA instrument aboard VEGA I, and coma plasma ions by the PICCA instrument aboard GIOTTO. For the organic molecules results an overall C:H:O:N ratio of 1.:1.4:0.6:0.1.
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Water Ice and Dust in the Innermost Coma of Comet 103P/Hartley 2 [PDF]
Icarus, 2014 51 pages, 12 figures, accepted for publication in ...
Silvia Protopapa +2 more
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Dust in Comet 103P/Hartley 2 Coma During EPOXI Mission
Icarus, 2013 International audienceThe Deep Impact spacecraft flew by Comet 103P/Hartley 2 on 4 November 2010 (EPOXI mission). In situ observations are complemented by a systematic ground- and space-based observation campaign. In the present work, imaging polarimetry
Jeremie Lasue +2 more
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Coma Dust Scattering Concepts Applied to the Rosetta Mission
Icarus, 2015Abstract This paper describes basic concepts, as well as providing a framework, for the interpretation of the light scattered by the dust in a cometary coma as observed by instruments on a spacecraft such as Rosetta. It is shown that the expected optical depths are small enough that single scattering can be applied.
Giovanna Rinaldi, Uwe Fink
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Confirmation of dust clusters in the coma of Comet Halley
Advances in Space Research, 1989Measurements from the Ducma dust counter and mass analyzer on the Vega spacecraft are compared with those from the SP-1 sensor on the same spacecraft. It is shown that the sequence of pulses recorded by the SP-1 instruments show deviations from a random distribution. Some of the nonrandom sequences observed by SP-1 are in the same time intervals as the
J.A. Simpson +4 more
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Dust Measurements in the Coma of Comet 81P/Wild 2 by the Dust Flux Monitor Instrument
Science, 2004We present measurements of the dust particle flux and mass distribution from the Stardust Dust Flux Monitor Instrument (DFMI) throughout the flyby of comet 81P/Wild 2. In the particle mass regime from 10 –14 to 10 –7 kilograms, the spacecraft encountered regions of intense swarms of particles,
Donald E. Brownlee +2 more
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