Initial studies of the origin of Sadna led to estimates that it might have been thrown from the inner region of the solar system with the help of the gravity of the gas giants such as Jupiter and Saturn, or alternatively it is actually from the kipfer belt of another planet that was captured by the sun's gravity
Astronomers recently announced that the discovery of Sedna, an object approaching the size of Pluto and orbiting the Sun in an orbit that takes 12,500 years to orbit it. New computer simulations done at the Southwest Research Institute illustrate that Sadna formed beyond the orbit of Pluto, and did not form closer to the Sun and was blown out by the gravity of the gas giants.
If this did occur, it would mean that the region of planet formation in our solar system may extend far beyond what was previously believed, and there may be more workshop-type objects in the ecliptic at the edge of the solar system.
The diameter of the planetoid Sadna (the definition is arbitrary, it can equally well be defined as an AB planet) is 1,600 km, two-thirds that of Pluto. Preliminary studies of the origin of Sadna led to estimates that it might have been thrown from the inner region of the solar system With the help of the gravity of the gas giants like Jupiter and Saturn, or alternatively it is actually the kipper belt of another planet that was captured by gravity of the sun
In an article published in the January 2005 issue of the Astronomical Journal. Dr. Alan Stern of the Department of Space Science and Space Engineering at the Southwest Research Center writes that a workshop could have formed beyond Pluto.
"If this is indeed true," claims Stern, "it can testify that the factory for the production of planets in the solar system operated far beyond the area we have considered so far, and also that the edge of the Kiiper Belt, 50 astronomical units from the Sun (an astronomical unit is the distance from the Earth to the Sun , about 150 million km), is not the outer edge but only the inner edge of a gap derived from a much larger structure, which perhaps should be called the Kiiper disc.
Stern assumed in a workshop creation simulation that the solar nebula was a disc of similar size to those seen near many young stars of the Sun's type - such as the well-known example of a disc with a diameter of 1,500 astronomical units surrounding the star Beta Pictoris. Stern said.
Model calculations showed that an object the size of a Sedna or even larger could easily have formed in a circumpolar orbit at a distance of 75 to 500 AU, "the time required for this is relatively small, only a few percent of the age of the solar system, Stern said. "If a Sedna did form far away , it is probably accompanied by a group of large planetoids in this remote region of the solar system. One of the signs that these objects were indeed founded where they are and not elsewhere would be if a significant portion of them circled the sun in orbits relatively close to the circle.
