(15788) 1993 SB

1993 SB is a trans-Neptunian object of the plutino class. Apart from Pluto, it was one of the first such objects discovered, and the first to have an orbit calculated well enough to receive a number. The discovery was made in 1993 at the La Palma Observatory with the Isaac Newton Telescope.
Very little is known about the object. Even the diameter estimate of ~130 km is based on an assumed albedo of 0.09.
Other Kuiper belt objects discovered in 1993 include 1993 SC, 1993 FW, and 1993 RO.
Over one thousand bodies were found in a belt between orbiting between about 30–50 AU from the Sun in the twenty years, after finding , showing a vast belt of bodies more than just Pluto and Albion. By 2018, over 2000 Kuiper belt objects were discovered.