| Date | Miss Distance | Speed |
|---|---|---|
| April 24, 1910 | 0.1076 AU (16.1 million km) | 14.8 km/s |
| May 7, 1931 | 0.0620 AU (9.3 million km) | 16.5 km/s |
| May 4, 1975 | 0.0372 AU (5.6 million km) | 16.1 km/s |
| April 20, 1998 | 0.1438 AU (21.5 million km) | 14.7 km/s |
| May 16, 2019 | 0.1868 AU (27.9 million km) | 18.7 km/s |
| May 3, 2042 | 0.0292 AU (4.4 million km) | 15.8 km/s |
| April 22, 2065 | 0.1159 AU (17.3 million km) | 14.8 km/s |
| May 8, 2109 | 0.0701 AU (10.5 million km) | 16.6 km/s |
| May 2, 2132 | 0.0317 AU (4.7 million km) | 15.6 km/s |
| April 17, 2155 | 0.1841 AU (27.5 million km) | 14.7 km/s |
| May 13, 2176 | 0.1444 AU (21.6 million km) | 17.8 km/s |
| May 2, 2199 | 0.0348 AU (5.2 million km) | 15.6 km/s |
12538 (1998 OH) is classified as a Potentially Hazardous Asteroid (PHA) because it is estimated to be larger than 140 meters and its orbit comes within 0.05 AU of Earth. NASA continuously monitors this object for any future impact risk. Current data does not indicate a confirmed impact event.
12538 (1998 OH) is classified as a potentially hazardous asteroid (PHA) by NASA. This means it is large enough and its orbit brings it close enough to Earth to warrant close monitoring. However, a PHA classification does not mean an impact is imminent.
The closest recorded Earth approach of 12538 (1998 OH) is 0.1076 AU (16.1 million km) on April 24, 1910, at a speed of approximately 14.8 km/s.
12538 (1998 OH) has an estimated diameter of 2.76 km (1708โ3820 meters range). Its absolute magnitude (H) is 15.96, which NASA uses along with assumed albedo to estimate size.