2019 UN13
2019 UN13 is a small near-Earth asteroid roughly 1–2 meters in diameter. Even though the asteroid was in the night sky for months, it was fainter than the sky survey limit of apparent magnitude 24 until 29 October 2019 when the asteroid was two million km from Earth. It was discovered on October 31, 2019, passing 6,200 km above Earth's surface.
| Discovery | |
|---|---|
| Discovered by | CSS (Teddy Pruyne) |
| Discovery site | Catalina Stn. |
| Discovery date | 31 October 2019 (first observed only) |
| Designations | |
MPC designation | 2019 UN13 |
Alternative designations | C0PPEV1 |
Minor planet category | NEO · Aten |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 7 | |
| Observation arc | 3.7 hours (18 observations) |
| Aphelion | 1.3301 AU (2.06 AU after passage) |
| Perihelion | 0.6463 AU |
Semi-major axis | 0.9882 AU |
| Eccentricity | 0.3460 |
Orbital period (sidereal) | 359 days |
Mean anomaly | 100.74° |
Mean motion | 1° 0m 12.24s / day |
| Inclination | 1.4925° |
Longitude of ascending node | 217.58° |
| 291.05° | |
| Earth MOID | 0.000005 AU (700 km) |
| Physical characteristics | |
Mean diameter | 1–2 m |
| Mass | 2800 kg (est.) |
| 32.0 | |
2020 QG and 2011 CQ1 are the only asteroids known where the nominal orbit passed closer to the surface of Earth. Other asteroids that passed very close to Earth include 2004 FU162, 2018 UA, and 2019 AS5.
An impact by 2019 UN13 would be less significant than the 2018 LA impact.
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