2014 RC is a sub-kilometer asteroid, classified as near-Earth object of the Apollo group. On 7 September 2014, it passed within 0.000267 AU (39,900 km; 24,800 mi) (0.1 LD) of Earth. The asteroid is approximately the diameter of the Chelyabinsk meteor, and passed almost as close to Earth as 367943 Duende (2012 DA14) did in 2013.
With an absolute magnitude of 26.8, the asteroid is about 11–25 meters (36–82 ft) in diameter depending on the albedo. Observations by the NASA Infrared Telescope Facility conclude the asteroid is a fairly bright Sq-class asteroid which have an average albedo of around 0.24, and would give the asteroid a spherical equivalent diameter of 12 meters (39 ft). Measurements by multiple telescopes indicate that the asteroid rotates in 15.8 seconds making it one of the fastest rotating asteroids so far discovered. Using the 15.8 second rotation period, more accurate radar observations by Goldstone shows the asteroid has a largest axis of at least 22 meters (72 ft). Due to the asteroid's fast rotation, it is a monolith and not a rubble pile.
On 8 September 2115 the asteroid will pass about 0.0053 AU (790,000 km; 490,000 mi) from the moon. On 5 September 1973, the asteroid passed between 0.01052 AU (1,574,000 km; 978,000 mi) and 0.01207 AU (1,806,000 km; 1,122,000 mi) from Earth. 2014 RC was removed from the JPL Sentry Risk Table on 5 September 2014 and there are no known possible impact dates in the next 100 years.