What is "sednoid"

n. (context astronomy English) A trans-Neptunian object of the inner Oort cloud, that is, one with a perihelion greater than 75 astronomical unit.

A sednoid is a trans-Neptunian object with a perihelion greater than and a semi-major axis greater than . Only two objects are known from this population, 90377 Sedna and , both of which have perihelia greater than , but it is suspected that there are many more. These objects lie outside an apparently nearly empty gap in the Solar System starting at about 50 AU, and have no significant interaction with the planets. They are usually grouped with the detached objects. Some astronomers, such as Scott Sheppard, consider the sednoids to be inner Oort cloud objects (OCOs), though the inner Oort cloud, or Hills cloud, was originally predicted to lie beyond 2,000 AU, several times as far as the aphelia of the two known sednoids.