|Discovered by||CSS (Teddy Pruyne)|
|Discovery site||Catalina Stn.|
|Discovery date||31 October 2019|
(first observed only)
|NEO · Aten |
|Orbital characteristics |
|Epoch 27 April 2019 (JD 2458600.5)|
|Uncertainty parameter 7|
|Observation arc||3.7 hours|
(2.06 AU after passage)
|1° 0m 12.24s / day|
|Earth MOID||0.000005 AU (700 km)|
|Mass||2800 kg (est.)|
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.
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.
The close approach to Earth lifted the asteroid's aphelion point (furthest distance from the Sun) from 1.33 AU (inside the orbit of Mars) to 2.06 AU (near the edge of the inner asteroid belt). The approach changed the orbit from an Aten asteroid with a semi-major axis less than 1 AU to an Apollo asteroid with a semi-major axis greater than that of the Earth (> 1 AU).
(closest distance to the Sun)
|0.64 AU||0.83 AU|
(average distance from the Sun)
|0.98 AU||1.4 AU|
(furthest distance from the Sun)
|1.3 AU||2.0 AU|
|Orbital period||358 days||637 days|
With the new orbit, 2019 UN13 will come to perihelion 0.83 AU from the Sun on 15 December 2019. Without perturbations, the previous orbit would have come to perihelion in January 2020.
surface of Earth
|2020 VT4||2020-11-13||374 km||±25 km||data|
|2020 QG||2020-08-16||2946 km||±20 km||data|
|2011 CQ1||2011-02-04||5481 km||±5 km||data|
|2019 UN13 2019-10-31 6242 km ±200 km data|
|2008 TS26||2008-10-09||6259 km||±1000 km||data|
|2004 FU162||2004-03-31||6542 km||±15000 km||data|