Below is the list of asteroids that have come close to Earth in 2024.
A list of the 145 known near-Earth asteroid close approaches less than 1 lunar distance () from Earth in 2024, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS).
For reference, the radius of Earth is about . Geosynchronous satellites have an orbit with semi-major axis length of .
The closest approach of Earth by an asteroid in 2024 was that of , an asteroid with a diameter of , at from the center of the Earth, or above its surface. The largest asteroid to pass within 1 LD of Earth in 2024 was at in diameter, for an absolute magnitude of 22.0. The fastest asteroid to pass within 1 LD of Earth in 2024 was that passed Earth with a velocity with respect to Earth of , while the slowest bypass within lunar distance was that of at a velocity with respect to Earth of .
The CNEOS database of close approaches lists some close approaches a full orbit or more before the discovery of the object, derived by orbit calculation. The list below only includes close approaches that are evidenced by observations, thus the pre-discovery close approaches would only be included if the object was found by precovery, but there was no such close approach in 2024.
This list and relevant databases do not consider impacts as close approaches, thus this list does not include , , and , asteroids which were predicted to impact on Earth and burned up in its atmosphere, as well as several more objects that collided with Earth's atmosphere in 2024 which weren't discovered in advance, but were observed visually or recorded by infrasound sensors designed to detect detonation of nuclear devices.
This sub-section visualises the warning times of the close approaches listed in the above table, depending on the size of the asteroid. The sizes of the charts show the relative sizes of the asteroids to scale. For comparison, the approximate size of a person is also shown. This is based the absolute magnitude of each asteroid, an approximate measure of size based on brightness.
Absolute magnitude H âÂÂ¥ 30 (smallest) (size of a person for comparison)
Absolute magnitude 30 > H âÂÂ¥ 29
Absolute magnitude 29 > H âÂÂ¥ 28
Absolute magnitude 28 > H âÂÂ¥ 27
Absolute magnitude 27 > H âÂÂ¥ 26
Absolute magnitude 26 > H âÂÂ¥ 25
Absolute magnitude 25 > H (largest)
Among asteroids observed during a close approach beyond one lunar distance, (which passed at on 17 September 2024) was noteworthy as a contact binary with a diameter of imagined by radar.
Below is an example list of near-Earth asteroids discovered prior to 2024 that were predicted to pass more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2024.