It was discovered on 30 September 2014, by NASA's Wide-field Infrared Survey Explorer telescope (WISE) in Earth's orbit.

[1] As a potentially hazardous asteroid, 2014 SR339 has a minimum orbital intersection distance (MOID) with Earth of less than 0.05 AU and a diameter of greater than 150 meters.

[3][a] According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, 2014 SR339 measures 0.971 kilometers in diameter and its surface has an albedo of 0.068.

[4] During its close approach in February 2018, radiometric observations by Arecibo Observatory determined that the object is at least 1.5 kilometers (0.93 miles) wide.

[3] Data from the Arecibo Telescope released in 2022 showed an unusually high radar albedo, possibly indicating rich metal content.