(164207) 2004 GU9

 is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group. It will be a quasi-satellite of Earth until around 2600.

On 14 April 2004 (with less than a 1-day observation arc), the Sentry Risk Table showed 180 virtual impactors. It was removed from the Sentry Risk Table 2 days later on 16 April 2004. now has a well determined orbit with an observation arc of 12 years.

Discovery and naming
This asteroid was discovered on 13 April 2004 by the Lincoln Near-Earth Asteroid Research project near Socorro, New Mexico and given the provisional designation. Following the naming of 524522 Zoozve, a quasi-satellite of Venus, Radiolab and the International Astronomical Union will hold a public naming campaign for this quasi-satellite from June to September 2024. The selected name will be announced in January 2025.