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Its lack of any trace of a tail and its slow motion led within months to the conclusion that the object was a planet, rather than a comet, moving in a nearly circular orbit well beyond Saturn.
In the interim, Brown and his colleagues Chad Trujillo and David Rabinowitz had spotted Sedna, a small, icy object with an eccentric orbit well outside the Kuiper Belt; it comes no closer to the sun than seventy-six astronomical units and, at its farthest, strays more than nine hundred astronomical units away.
It has a highly elliptical orbit well beyond Neptune, the outermost giant planet in the solar system.
Only last year, Russia's Phobos-Grunt mission to the Martian moon Phobos failed to make it out of Earth orbit (well, it did eventually when it burned up on re-entry).
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The only thing publically known in the West is that the satellite has been accurately placed in a very specific orbit well-suited to Earth observation tasks.
It orbits well within the star's "habitable" or "Goldilocks" zone - the region where temperatures are neither too hot nor too cold to sustain life.
Crucially, it orbits well within its star's "Goldilocks zone": neither too close nor too far away for liquid water (and therefore, perhaps, life) to exist on its surface.It joins two other Earthlike planets Gliese 581d and HD 85512 b discovered by another instrument within the past few years.
Over millions of years, these fragments settled into two major groups: the spherical Oort cloud, orbiting well beyond Pluto at some 7.5 trillion kilometers (50,000 astronomical units) from the sun, and the Kuiper belt, a disklike region of ice chunks extending from Neptune's orbit to about 7.5 billion kilometers (50 AU) away.
The phase portraits connecting these equilibrium points exhibit periodic orbits, heteroclinic orbits, as well as homoclinic orbits.
Previous studies found two populations of hot Jupiters - one around cool stars with orbits well-aligned with the stellar rotational axes, and the other around hot stars with isotropic distribution of obliquities, including planets with retrograde motion.
Consequently, it is particularly suitable for both near-circular and near-equatorial orbits as well as orbits which transit periodically around null eccentricities and null inclinations.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com