2022 Ur4
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.
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. During the close approach, the asteroid passed above the northern hemisphere of Earth and reached a peak brightness of magnitude 10, just 40 times fainter than the threshold of naked eye visibility.
| Discovery | |
|---|---|
| Discovered by | ATLAS-MLO |
| Discovery site | Mauna Loa Obs. |
| Discovery date | 26 November 2022 |
| Designations | |
| 2022 WM7 | |
| A10OBKV | |
| NEO · Apollo | |
| Orbital characteristics | |
| Epoch 25 February 2023 (JD 2460000.5) | |
| Uncertainty parameter 6 | |
| Observation arc | 13.56 hours |
| 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 | |
| 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) |
| 28.90±0.45 | |
Notes
References
External links
- 2022 UR4 at NeoDyS-2, Near Earth Objects—Dynamic Site
- 2022 UR4 at ESA–space situational awareness
- 2022 UR4 at the JPL Small-Body Database
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