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Article
Discovery of five irregular moons of Neptune
Each giant planet of the Solar System has two main types of moons. ‘Regular’ moons are typically larger satellites with prograde, nearly circular orbits in the equatorial plane of their host planets at distanc...
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Article
Discovery of 12 satellites of Saturn exhibiting orbital clustering
The giant planets in the Solar System each have two groups of satellites. The regular satellites move along nearly circular orbits in the planet's orbital plane, revolving about it in the same sense as the pla...
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Article
The red ragged edge
Small objects in the Kuiper belt - a zone at the very edge of our Solar System - appear to come in two shades. The redder ones may be furthest from the Sun.
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Article
Small Bodies in the Outer Solar System
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Article
Discovery of two distant irregular moons of Uranus
The systems of satellites and rings surrounding the giant planets in the Solar System have remarkably similar architectures1. Closest to each planet are rings with associated moonlets, then larger ‘regular’ satel...
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Article
A new dynamical class of object in the outer Solar System
Some three dozen objects have now been discovered1,2,3,4,5 beyond the orbit of Neptune and classified as members of the Kuiper belt—a remnant population of icy planetesimals that failed to be incorporated into pl...
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Article
Coordination of minor planet orbital studies: Past, present and future
A brief account is given of the coordination of astrometric observations and orbital studies of minor planets, particularly with regard to the role played in the past by the Astronomisches Rechen-Institut. The...
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Article
The Minor Planet Center
The history and current status of the Minor Planet Center are described, and thoughts are presented on future plans for the Center.