Discovery [1] | |
---|---|
Discovered by | LINEAR |
Discovery site | Lincoln Lab's ETS |
Discovery date | 13 April 2004 |
Designations | |
NEO · Apollo | |
Orbital characteristics [2] | |
Epoch 13 January 2016 ( JD 2457400.5) | |
Uncertainty parameter 0 | |
Observation arc | 5424 days (14.85 yr) |
Aphelion | 1.1376258581 AU (170.18640603 Gm) |
Perihelion | 0.86490477 AU (129.387912 Gm) |
1.001265315 AU (149.7871591 Gm) | |
Eccentricity | 0.1361882 |
1.00 yr (365.95 d) | |
154.915171 ° | |
0° 59m 1.464s / day | |
Inclination | 13.6490265° |
38.6405971° | |
280.55672±0.00007 ° | |
2456145.53817±0.00006 jd | |
280.28542° | |
Earth MOID | 0.000389702 AU (58,298.6 km) |
Physical characteristics | |
Mean diameter | 160–360 meters [3] |
0.219 | |
21.1 [2] | |
(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. [4]
On 14 April 2004 (with less than a 1-day observation arc), the Sentry Risk Table showed 180 virtual impactors. [5] It was removed from the Sentry Risk Table 2 days later on 16 April 2004. [6] (164207) 2004 GU9 now has a well determined orbit with an observation arc of 12 years.
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 2004 GU9. [1] 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. [7] [8]
Radiolab is partnering with the International Astronomical Union to launch a months-long global naming contest for one of Earth's quasi-moons (asteroid 164207).