2017 TD6

is a micro-asteroid, classified as a near-Earth object of the Apollo group, approximately 10–20 meters in diameter. It was first observed by Pan-STARRS at Haleakala Observatory, Hawaii, on 11 October 2017.
On 19 October 2017, the asteroid transited Earth at a nominal distance of, which corresponds to 0.5 lunar distances. On the following day it also passed near the Moon at. Peaking near a magnitude of 18, the object was too faint to be seen—except for the largest telescopes.
As of 2018, has a poorly determined orbit with an uncertainty of 6 and a short observation arc of 8 days only. Due to its small size, the asteroid is likely to remain unobserved until its next, still relatively distant approach, predicted to occur in March 2044, at a distance of or 5.3 LD from Earth.