(98943) 2001 CC21

' (provisional designation ') is a stony near-Earth asteroid of the Apollo group, with a diameter of about 500 m. It was discovered by the Lincoln Near-Earth Asteroid Research (LINEAR) survey at Socorro, New Mexico on 3 February 2001. It is an upcoming flyby target of JAXA's Hayabusa2 extended mission, which will approach less than 100 km from the asteroid in July 2026.

Discovery and naming
This asteroid was discovered on 3 February 2001 by the Lincoln Near-Earth Asteroid Research project near Socorro, New Mexico and given the provisional designation. JAXA held a public naming campaign for the asteroid from December 2023 to May 2024, and a name will be selected in summer 2024.

Physical characteristics
Near-infrared spectroscopy of in 2023 shows that it is a stony S-type asteroid composed of silicates, with traces of pyroxene on its surface. These findings disprove earlier suggestions of an L-type asteroid spectrum, which lack pyroxene absorption bands by contrast.

Rotation and light curve
's rotation period was first measured through photometric light curves in January 2002, which showed a periodicity of 5.02 hours. Observations in 2003 and 2022 secured this period and refined it to $329 m$ hours. significantly varies in brightness by 0.8–1.1 magnitudes as it rotates, which indicates it has an elongated shape.

Exploration
In September 2020, a mission extension for JAXA's Hayabusa2 asteroid sample return probe was selected to do additional flybys of two near-Earth asteroids: in July 2026 and a rendezvous with  in July 2031. Hayabusa2 will flyby within 100 km of at a very high relative speed of 5 km/s, which will pose a challenge for the spacecraft's navigation and tracking capabilities during the encounter.