A possible long-lived belt of objects between Uranus and Neptune

Article Abstract:

Around 0.3% of small bodies moving on low-inclination, low-eccentricity orbit in the area 24-27 AU from the Sun could exist for as long as the Solar System. The region of stability between the orbits of Neptune and Uranus which could supply short-period comets is identified using numerical simulations. The giant planets have a gravitational influence on materials in most regions of stability in the outer Solar System. The effect of dynamical processes such as outer-planet migration could be studied in future research to ascertain the impact on surviving object distribution.

Discovery and exploration, Outer space, Space exploration, Letter to the Editor, Neptune (Planet), Uranus (Planet)

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Energetic ions at comet Grigg-Skjellerup measured from the Giotto spacecraft

Article Abstract:

The EPONA instrument on Giotto spacecraft detected charged, energetic particles deep within the inner coma of the comet Grigg-Skjellerup. The ions close to the nucleus were strongly coupled to the ambient magnetic field. The Giotto spacecraft, that flew within about 200 km of the nucleus of Grigg-Skijellerup, had the closet approach so far of a spacecraft to a cometary nucleus.

Usage, Astronomy, Spacecraft, Space vehicles, Space astronomy

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Fly-through at Wild 2

Article Abstract:

Comet Wild 2 presented an unique opportunity for the Stardust spacecraft to investigate the evolution of the comet as it flew through the coma - the dust and gas escaping from the tail - to send back information to the Earth. Many differences were noted as compared to other comets, which were visited by other spacecraft.

United States, Science & research

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