Poor Kuiper belt's objects...
They keep on being downgraded...
Dwarf planet wannabe Sedna is considerably smaller than previously assumed, according to a new study of Trans-Neptunian Objects (TNOs). Once the most distant object observed in the solar system, Sedna was thought to have a diameter of around 1700km. But a new paper, dubbed "TNOs are Cool": A survey of the trans-Neptunian …