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..Newly-discovered #asteroid C0PPEV1 Twitter message

2020 QG and are the only asteroids known where the nominal orbit passed closer to the surface of Earth.Go to https://cneos.jpl.nasa.gov/ca/ and for Table Settings select "Nominal distance <= 1 LD", "Past only" and sort by "CA distance nominal" Other asteroids that passed very close to Earth include , 2018 UA, and .

An impact by would be less significant than the 2018 LA impact.

2019 flyby

5 minute markers of trajectory above the earth near closest approach

Orbit changes 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). +Orbital elements for April 2019 and April 2020 2019 2020Orbit type Aten ApolloPerihelion(closest distance to the Sun) 0.64 AU 0.83 AUSemi-major axis(average distance from the Sun) 0.98 AU 1.4 AUAphelion(furthest distance from the Sun) 1.3 AU 2.0 AUOrbital period 358 days 637 days

With the new orbit, 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.

Future There is a small chance the asteroid will pass from Mars on 26 October 2023. There is also a 1 in 3 million chance the asteroid will impact Earth on 1 November 2111.

2019 UN13

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