Discovery[1][2] | |
---|---|
Discovered by | ATLAS-MLO |
Discovery site | Mauna Loa Obs. |
Discovery date | 26 November 2022 |
Designations | |
2022 WM7 | |
A10OBKV[3] | |
NEO · Apollo[1] | |
Orbital characteristics[4] | |
Epoch 25 February 2023 (JD 2460000.5) | |
Uncertainty parameter 6 | |
Observation arc | 13.56 hours[1] |
Aphelion | 2.701 AU |
Perihelion | 0.831 AU |
1.766 AU | |
Eccentricity | 0.5294 |
2.35 yr (857.0 days) | |
36.030° | |
0° 25m 12.279s / day | |
Inclination | 11.292° |
207.182° | |
December 2022[4] | |
238.577° | |
Earth MOID | 0.000407 AU (60,900 km; 0.158 LD) |
Jupiter MOID | 2.641 AU |
Physical characteristics | |
Mean diameter | 4.4–9.9 m (assumed albedo 0.05–0.25)[5] |
28.90±0.45[4] | |
2022 UR4 is a small near-Earth asteroid that made an extremely close approach within 0.044 lunar distances (17,000 km; 11,000 mi) from Earth's center on 20 October 2022 at 22:45 UTC.[4] It was discovered about 14 hours before closest approach by the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey telescope at Mauna Loa Observatory, Hawaii on 20 November 2022.[2] During the close approach, the asteroid passed above the northern hemisphere of Earth and reached a peak brightness of magnitude 10,[2] just 40 times fainter than the threshold of naked eye visibility.[a]