(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.[3]
Discovery | |
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Discovered by | LINEAR |
Discovery site | Lincoln Lab's ETS |
Discovery date | 13 April 2004 |
Designations | |
Minor planet category | NEO · Apollo |
Orbital characteristics[1] | |
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) |
Semi-major axis | 1.001265315 AU (149.7871591 Gm) |
Eccentricity | 0.1361882 |
Orbital period (sidereal) | 1.00 yr (365.95 d) |
Mean anomaly | 154.915171° |
Mean motion | 0° 59m 1.464s / day |
Inclination | 13.6490265° |
Longitude of ascending node | 38.6405971° |
Longitude of perihelion | 280.55672±0.00007° |
Time of perihelion | 2456145.53817±0.00006 jd |
Argument of perihelion | 280.28542° |
Earth MOID | 0.000389702 AU (58,298.6 km) |
Physical characteristics | |
Mean diameter | 160–360 meters[2] |
Geometric albedo | 0.219 |
Absolute magnitude (H) | 21.1[1] |
On 14 April 2004 (with less than a 1-day observation arc), the Sentry Risk Table showed 180 virtual impactors.[4] It was removed from the Sentry Risk Table 2 days later on 16 April 2004.[5] (164207) 2004 GU9 now has a well determined orbit with an observation arc of 12 years.
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