List of asteroid close approaches to Earth in 2024

Asteroids which came closer to Earth than the Moon in 2024 by time of discovery

After closest approach: 65 (44.8%)   < 24 hours before: 18 (12.4%)   up to 7 days before: 58 (40.0%)   > one week before: 4 (2.8%)   > 7 weeks before: 0 (0.0%)   > one year before: 0 (0.0%) Other years 2022, 2023, 2024, 2025, 2026

Asteroids which came closer to Earth than the Moon in 2024 by discoverer

G96 Mt. Lemmon Survey: 48 (33.1%)   703 Catalina Sky Survey: 25 (17.2%)   F52 Pan-STARRS 2: 13 (9.0%)   L51 MARGO, Nauchyi: 9 (6.2%)   T05 ATLAS-MLO, Manua Loa: 9 (6.2%)   F51 Pan-STARRS 1: 8 (5.5%)   T05 ATLAS-HKO, Haleakala: 7 (4.8%)   K88 GINOP-KHK, Piszkesteto: 7 (4.8%)   M22 ATLAS South Africa: 6 (4.1%)   W68 ATLAS Chile: 5 (3.4%)   V00 Kitt Peak-Bok: 3 (2.1%)   L87 Moonbase South Obs.: 2 (1.4%)   I41 Palomar Mountain--ZTF: 1 (0.7%)   W16 Pleasant Groves Obs.: 1 (0.7%)   U68 JPL SynTrack RT: 1 (0.7%)

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 (0.0025696 AU (384,410 km; 238,860 mi)) from Earth in 2024, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS).^[1]

For reference, the radius of Earth is about 0.0000426 AU (0.0166 LD; 6,370 km; 3,960 mi). Geosynchronous satellites have an orbit with semi-major axis length of 0.000282 AU (0.110 LD; 42,200 km; 26,200 mi).

The closest approach of Earth by an asteroid in 2024 was that of 2024 XA, an asteroid with a diameter of 1.2–2.8 m (3.9–9.2 ft), at 7,726 km (4,801 mi; 5.165×10⁻⁵ AU; 0.02010 LD) from the center of the Earth, or 1,350 km (840 mi) above its surface.^[2] The largest asteroid to pass within 1 LD of Earth in 2024 was 2024 MK at 100–230 m (330–750 ft) in diameter, for an absolute magnitude of 22.0.^[3] The fastest asteroid to pass within 1 LD of Earth in 2024 was 2024 CH₄ that passed Earth with a velocity with respect to Earth of 24.01 km/s (53,700 mph),^[4] while the slowest bypass within lunar distance was that of 2024 VO at a velocity with respect to Earth of 3.08 km/s (6,900 mph).^[5]

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 2024 BX1, 2024 RW1, 2024 UQ and 2024 XA1, 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.^[6]

     Rows highlighted red indicate objects which were not discovered until after closest approach

     Rows highlighted yellow indicate objects discovered less than 24 hours before closest approach

     Rows highlighted green indicate objects discovered more than one week before closest approach

     Rows highlighted turquoise indicate objects discovered more than 7 weeks before closest approach

     Rows highlighted blue indicate objects discovered more than one year before closest approach
(i.e. objects successfully cataloged on a previous orbit, rather than being detected during final approach)

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.^[1]

Absolute magnitude H ≥ 30 (smallest)

(size of a person for comparison)

Absolute magnitude 30 > H ≥ 29

Absolute magnitude 29 > H ≥ 28

Absolute magnitude 28 > H ≥ 27

Absolute magnitude 27 > H ≥ 26

Absolute magnitude 26 > H ≥ 25

Absolute magnitude 25 > H (largest)

•   After closest approach: 2 (66.7%)
•   < 24 hours before: 0 (0.0%)
•   up to 7 days before: 0 (0.0%)
•   > one week before: 1 (33.3%)
•   > 7 weeks before: 0 (0.0%)
•   > one year before: 0 (0.0%)

Among asteroids observed during a close approach beyond one lunar distance, 2024 ON (which passed at 0.006682 AU (2.600 LD) on 17 September 2024) was noteworthy as a contact binary with a diameter of 350 m (1,150 ft) imagined by radar.^[293]

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.

• List of asteroid close approaches to Earth
• List of asteroid close approaches to Earth in 2023
• List of asteroid close approaches to Earth in 2025
• Asteroid impact prediction