101869 (1999 MM) is an Apollo asteroid that approaches to within 15 million km (0.1 au) of Mars, Earth, and Venus. Its orbit is very similar to that of Hermes, which in 1937 made what was for decades the closest observed approach to Earth by an asteroid. 1999 MM's nearest pass to Earth within at least a century of present was the 930,000 km one in 1875. In 2090 it passes Venus at 788,000 km.
It was discovered in the Lowell Observatory Near-Earth-Object Search on June 20, 1999 at Anderson Mesa.