(15874) 1996 TL66

is a trans-Neptunian object of the scattered disc orbiting in the outermost region of the Solar System.
The Spitzer Space Telescope has estimated this object to be about in diameter, but 2012 estimates from the Herschel Space Observatory estimate the diameter as closer to. It is not a detached object, since its perihelion is under the influence of Neptune. Light-curve-amplitude analysis suggests that it is a spheroid.

Discovery

Discovered in 1996 by David C. Jewitt et al., it was the first object to be categorized as a scattered-disk object, although, discovered a year earlier, was later recognised as a scattered-disk object. It was considered one the largest known trans-Neptunian objects at the time of the discovery, being placed second after Pluto. It came to perihelion in 2001.

orbits the Sun with a semi-major axis of 83.9 AU but is currently only 35 AU from the Sun with an apparent magnitude of 21. In 2007, the Spitzer Space Telescope estimated it to have a low albedo with a diameter of about. More-recent measurements in 2012 by the 'TNOs are Cool' research project and reanalysis of older data have resulted in a new estimate of these figures. It is now assumed that it has a higher albedo and the diameter was revised downward to. Light-curve-amplitude analysis shows only small deviations, suggesting has a spheroidal shape with small albedo spots.