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Small near-Earth asteroids (>20 meters) are interesting because they areprogenitors for meteorites in our terrestrial collection. Crucial to ourunderstanding of the effectiveness of our atmosphere in filtering low-strengthimpactors is the physical characteristics of these small near-Earth asteroids(NEAs). In the past, characterization of small NEAs has been a challengebecause of the difficulty in detecting them prior to close Earth flyby. In thisstudy we physically characterized the 2-meter diameter near-Earth asteroid 2015TC25 using ground-based optical, near-infrared and radar assets during a closeflyby of the Earth (distance 69,000 miles) in Oct. 2015. Our observationssuggest that its surface composition is similar to aubrites, a rare class ofhigh albedo differentiated meteorites. Aubrites make up only 0.14 % of all knowmeteorites in our terrestrial meteorite collection. 2015 TC25 is also a veryfast rotator with a rotation period of 133 seconds. We compared spectral anddynamical properties of 2015 TC25 and found the best candidate source body inthe inner main belt to be the 70-km diameter E-type asteroid (44) Nysa. Weattribute difference in spectral slope between the two objects to the lack ofregolith 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 thesmallest NEA ever to be characterized.

Physical Characterization of ~2-meter Diameter Near-Earth Asteroid 2015 TC25: A possible boulder from E-type Asteroid (44) Nysa