  Small near-Earth asteroids (>20 meters) are interesting because they are
progenitors for meteorites in our terrestrial collection. Crucial to our
understanding of the effectiveness of our atmosphere in filtering low-strength
impactors is the physical characteristics of these small near-Earth asteroids
(NEAs). In the past, characterization of small NEAs has been a challenge
because of the difficulty in detecting them prior to close Earth flyby. In this
study we physically characterized the 2-meter diameter near-Earth asteroid 2015
TC25 using ground-based optical, near-infrared and radar assets during a close
flyby of the Earth (distance 69,000 miles) in Oct. 2015. Our observations
suggest that its surface composition is similar to aubrites, a rare class of
high albedo differentiated meteorites. Aubrites make up only 0.14 % of all know
meteorites in our terrestrial meteorite collection. 2015 TC25 is also a very
fast rotator with a rotation period of 133 seconds. We compared spectral and
dynamical properties of 2015 TC25 and found the best candidate source body in
the inner main belt to be the 70-km diameter E-type asteroid (44) Nysa. We
attribute difference in spectral slope between the two objects to the lack of
regolith on the surface of 2015 TC25. Using the albedo of E-type asteroids
(50-60%) we refine the diameter of 2015 TC25 to 2-meters making it one of the
smallest NEA ever to be characterized.
