With an orbit (aphelion) of 960 astronomical units (32 times the distance of Neptune, the planet from the Solar System furthest from the Sun), Sedna is a world of ice that was only discovered 14 years ago ] and is located in the limits of the Solar System (although still closer than the Oört cloud, in immense cap of trillions of snow bodies surrounding the Solar System).
The exceptionally long and elongated orbit of Sedna takes about 11,400 years to complete it was not an obstacle for it to be discovered on November 14, as it is today, 14 years ago from the Observatorio de Monte Palomar de Sedna.
The name of Sedna comes from the goddess of the Eskimo mythology of the sea and of marine animals. Its surface is one of the reddest in the Solar System, and its composition, to a large extent, is a mixture of ice and tolina with frozen methane and nitrogen .
Its mass and its size and the International Astronomical Union has not formally recognized it as a dwarf planet. However, the astronomer Michael E. Brown (co-discoverer of Sedna and the dwarf planets Eris, Haumea and Makemake) believes that it is the most important transneptunian object found to date.
Sedna is located at 13,000 million kilometers from the Earth . This new world was announced on March 15, 2004 thanks to the astronomical observations of the Gemini Observatory of the California Institute of Technology (Caltech).
Sedna is, for the moment, the most distant and cold object of the solar system. In fact, it is believed that it may come from The Oört Cloud, also called Öpik-Oört Cloud. So, Sedna could be a huge comet that has decided to leave its cloud of megalithic snowflakes to get a little closer to the Sun.
An icy, reddish world (like Mars) that left the coldest region of the system to reach a more comfortable temperature that, however, never exceeds -240 Cº. An intermediate point between the sun of men and the cold orthodian comets .
After its discovery, it was always said that whoever was on its surface could hide our star with the head of a pin holding its arm fully extended.