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Reduction of Galileo and Ulysses dust data
Hamilton, D. P.; Grün, E.; Kissel, J. +4 more
The reduction procedures which are applied to raw data from the Galileo and Ulysses Dust Detectors are described in order to obtain physical parameters (mass and velocity) for the recorded dust impacts. Both detectors are impact ionization detectors which measure the charge released from an impact onto a solid target. From the rise times of the si…
Two years of Ulysses dust data
Hamilton, D. P.; Grün, E.; Kissel, J. +16 more
From October 18, 1990 to February 8, 1992 the Ulysses spacecraft traversed interplanetary space between the Earth and Jupiter; at Jupiter the spacecraft was deflected below the ecliptic onto a highly-inclined orbit ( i∼80°). Here, we report on dust impact data obtained from launch until the end of 1992, nearly a year after the Jupiter flyby. Durin…
Dust particles beyond the asteroid belt - a study based on recent results of the Ulysses dust experiment
Mann, Ingrid; Grün, Eberhard
Dust fluxes detected by the Ulysses dust experiment beyond the asteroid belt, their possible sources and the possibilities of comparing them to observations of dust in the Zodiacal light are discussed. The dust fluxes detected at solar distances about r < 2.5 AU are compatible with a population of interplanetary dust particles moving on low ecc…
HST observation of the inner coma of 2060 Chiron
Pasian, F.; Fulle, M.; Gil, A. Ortiz
The analysis of persistent comae of very large and distant comets allows us to infer the poorly known physical properties of dust and icy grains produced beyond Jupiter. Chiron is particularly interesting because Fulle ( Astron. Astrophys.282, 980-988; 1994) has shown that the strong asymmetricity of its coma (West, Astron. Astrophys.241, 635-645 …
Observations of minor planets by Hipparcos
Hestroffer, D.; Morando, B.
The main goal of Hipparcos is to build a catalogue of stars but 48 minor planets are bright enough and sufficiently pointlike to be observed also. This paper describes some aspects of the minor planets astrometric data reduction procedure. Comparison to the calculated places is given as well as a first attempt to minor planets orbital elements cor…
Observations of diffuse interstellar bands and of interstellar polarization
Somerville, W. B.
Results are presented from two distinct observational projects, concerning the optical diffuse interstellar bands observed with high-resolution and ultra-high resolution spectroscopy. and UV interstellar polarization observed with the Hubble Space Telescope.