List of asteroid close approaches to Earth in 2023

Asteroids which came closer to Earth than the Moon in 2023 by time of discovery

Asteroids which came closer to Earth than the Moon in 2023 by discoverer

Below is the list of asteroids that have come close to Earth in 2023.

Timeline of known close approaches less than one lunar distance from Earth

A list of known near-Earth asteroid close approaches less than 1 lunar distance () from Earth in 2023, 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 2023 was that of , an asteroid with a diameter of , at from the center of the Earth, or about above its surface. The largest asteroid to pass within 1 LD of Earth in 2023 was at in diameter, for an absolute magnitude of 24.3. The fastest asteroid to pass within 1 LD of Earth in 2023 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 .

As most asteroids passing within a lunar distance are less than 40 meters in diameter, they generally are not detected until they are within several million kilometres of Earth. Objects coming from the direction of the Sun may not be publicly announced until a few days after closest approach. For example, was first imaged six hours after closest approach, then confirmed by other observations, but not officially announced until 3.5 days after closest approach. that approached from the direction of the Sun was not first observed until 3.6 days after closest approach. The largest asteroid on this list that is risk–listed is at about 17 meters in diameter with a 3.5-day observation arc and a 1: chance of Earth impact on 24 September 2118. Sentry Risk Table: 2023 SM5

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 2023.

This list and relevant databases do not consider impacts as close approaches, thus this list does not include , an asteroid which was predicted to impact on Earth and burned up in its atmosphere, as well as several more objects that collided with Earth's atmosphere in 2023 which weren't discovered in advance, but were observed visually or recorded by infrasound sensors designed to detect detonation of nuclear devices.NASA.gov

Date ofclosestapproach DiscoveryDiscovery date (first reported image), and if the object was confirmed and previously undiscovered, the discoverer Object Nominal geocentric distanceDistance from the center of Earth to the center of the object. See the NASA/JPL Solar System Dynamics Glossary: Geocentric. Earth has a radius of approximately 6,400 km (0.0166 LD). Uncertaintyregion(3-sigma)Approx.size (m) (H)(abs. mag.) Closerapproachto MoonObjects that approached closer to the Moon than Earth are marked with a check. 2023-01-12 2023-01-13G96 Mt. Lemmon Survey ± 4.2–9.5 29.0 — 2023-01-12 2023-01-13703 Catalina Sky Survey ± 2.0–4.4 30.7 — 2023-01-15 2023-01-15P07 SST, HEH Station ± 2.0–4.4 30.6 ? 2023-01-21 2023-01-22F52 Pan-STARRS 2 ± 3.4–7.5 29.5 2023-01-25 2023-01-27G96 Mt. Lemmon Survey ± 5.5–12 28.4 — 2023-01-25 2023-01-18F52 Pan-STARRS 2 ± 15–34 26.2 — 2023-01-26 2023-01-24F52 Pan-STARRS 2 ± 4.0–8.9 29.1 — 2023-01-27 2023-01-21L51 Gennadiy Borisov ± 3.1–6.9 29.7 — 2023-01-27 2023-01-26G96 Mt. Lemmon Survey ± 4.1–9.1 29.1 — 2023-01-30 2023-02-01M22 ATLAS South Africa ± 10–23 27.0 — 2023-01-30 2023-01-29K88 GINOP-KHK, Piszkesteto ± 4.7–11 28.8 passed from the centerpoint of the Moon around 30 January 2023 13:34 UT. Since the Moon has a radius of about , it passed approximately from the surface of the Moon. 2023-02-09 2023-02-12G96 Mt. Lemmon Survey ± 3.8–8.5 29.2 — 2023-02-25 2023-02-24K88 GINOP-KHK, Piszkesteto ± 2.8–6.2 29.9 — 2023-03-09 2023-03-10703 Catalina Sky Survey ± 6.4–14 28.1 — 2023-03-12 2023-03-14G96 Mt. Lemmon Survey ± 2.1–4.6 30.6 — 2023-03-17 2023-03-13M22 ATLAS South Africa ± 12–26 26.8 — 2023-03-18 2023-03-18P07 SST, HEH Station ± 1.4–3.1 31.4 ? 2023-03-19 2023-03-17I41 Palomar Mountain--ZTF ± 3.4–7.7 29.4 — 2023-03-20 2023-03-20P07 SST, HEH Station ± 3.3–7.4 29.5 ? 2023-03-25 2023-03-26F51 Pan-STARRS 1 ± 4.0–9.0 29.1 — 2023-03-25 2023-02-27950 La Palma ± 37–83 24.3 — 2023-03-30 2023-03-28G96 Mt. Lemmon Survey ± 4.6–10 28.8 — 2023-04-11 2023-04-11K88 GINOP-KHK, Piszkesteto ± 5.5–12 28.4 — 2023-04-11 2023-04-14F52 Pan-STARRS 2 ± 5.1–11 28.6 — 2023-04-14 2023-04-16W68 ATLAS Chile ± 7.7–17 27.7 — 2023-04-15 2023-04-16G96 Mt. Lemmon Survey ± 4.1–9.1 29.1 — 2023-04-17 2023-04-16G96 Mt. Lemmon Survey ± 2.1–4.8 30.5 — 2023-04-17 2023-04-17P07 SST, HEH Station ± 1.1–2.4 32.0 ? 2023-04-18 2023-04-16F52 Pan-STARRS 2 ± 4.3–9.6 29.0 — 2023-04-18 2023-04-17G96 Mt. Lemmon Survey ± 2.7–6.0 30.0 — 2023-04-18 2023-04-17G96 Mt. Lemmon Survey ± 2.1–4.6 30.6 ? 2023-04-20 2023-04-17G96 Mt. Lemmon Survey ± 9.7–22 27.2 2023-04-23 2023-04-22G96 Mt. Lemmon Survey ± 4.4–9.8 28.9 — 2023-04-30 2023-04-29G96 Mt. Lemmon Survey ± 5.1–11 28.6 2023-05-08 2023-05-09703 Catalina Sky Survey ± 3.8–8.6 29.2 — 2023-05-09 2023-05-08703 Catalina Sky Survey ± 7.8–18 27.6 2023-05-12 2023-05-13G96 Mt. Lemmon Survey ± 3.0–6.7 29.7 — 2023-05-17 2023-05-19G03 Capricornus Observatory, Csokako ± 5.7–13 28.4 — 2023-05-22 2023-05-20G96 Mt. Lemmon Survey ± 7.8–18 27.6 — 2023-05-27 2023-05-28703 Catalina Sky Survey ± 8.2–18 27.6 — 2023-05-27 2023-05-28703 Catalina Sky Survey ± 6.2–14 28.2 2023-06-07 2023-06-07703 Catalina Sky Survey ± 4.9–11 28.7 — 2023-06-09 2023-06-10W68 ATLAS Chile ± 2.7–6.1 29.9 — 2023-06-13 2023-06-14G96 Mt. Lemmon Survey ± 3.1–6.8 29.7 — 2023-06-14 2023-06-10F52 Pan-STARRS 2 ± 13–30 26.5 — 2023-06-15 2023-06-14G96 Mt. Lemmon Survey ± 5.3–12 28.5 — 2023-06-17 2023-06-15F52 Pan-STARRS 2 ± 2.6–5.7 30.1 0 2023-06-18 2023-06-18G96 Mt. Lemmon Survey ± 1.9–4.1 30.8 ? 2023-06-20 2023-06-21F51 Pan-STARRS 1 ± 2.7–5.9 30.0 — 2023-06-20 2023-06-24 came to perihelion on 20 May 2023 and approached from the direction of the Sun. It made Earth closest approach at 20 June 2023 18:10 UT and was discovered later at 24 June 2023 07:36 UT.W94 MAP, San Pedro de Atacama ± 12–26 26.8 — 2023-06-23 2023-06-22G96 Mt. Lemmon Survey ± 2.7–6.0 30.0 — 2023-06-24 2023-06-21F51 Pan-STARRS 1 ± 5.6–13 28.4 — 2023-06-25 2023-06-21F51 Pan-STARRS 1 ± 4.0–9.0 29.1 — 2023-07-05 2023-07-08G96 Mt. Lemmon Survey ± 4.9–11 28.6 — 2023-07-13 2023-07-15M22 ATLAS South Africa ± 26–58 25.0 — 2023-08-18 2023-08-20K88 GINOP-KHK, Piszkesteto ± 5.0–11 28.6 — 2023-08-19 2023-08-20K88 GINOP-KHK, Piszkesteto ± 5.0–11 28.6 — 2023-08-20 2023-08-19F51 Pan-STARRS 1 ± 3.7–8.2 29.3 — 2023-09-05 2023-09-08F51 Pan-STARRS 1 ± 4.4–9.9 28.9 — 2023-09-06 2023-09-06P07 SST, HEH Station ± 3.1–7.0 29.7 ? 2023-09-07 2023-09-07G96 Mt. Lemmon Survey ± 0.91–2.0 32.3 — 2023-09-07 2023-09-10W94 MAP, San Pedro de Atacama ± 16–35 26.1 — 2023-09-08 2023-09-09G96 Mt. Lemmon Survey ± 5.8–13 28.3 — 2023-09-09 2023-09-10L51 Gennadiy Borisov ± 4.0–9.0 29.1 — 2023-09-13 2023-09-11F52 Pan-STARRS 2 ± 4.7–11 28.8 — 2023-09-16 2023-09-18G96 Mt. Lemmon Survey ± 4.9–11 28.7 — 2023-09-18 2023-09-19G96 Mt. Lemmon Survey ± 3.7–8.2 29.3 — 2023-09-20 2023-09-19G96 Mt. Lemmon Survey ± 3.6–8.1 29.3 2023-09-20 2023-09-21703 Catalina Sky Survey ± 4.6–10 28.8 — 2023-09-23 2023-09-19F52 Pan-STARRS 2 ± 14–32 26.4 2023-09-24 2023-09-22M22 ATLAS South Africa ± 6.6–15 28.0 ? 2023-09-24 2023-09-18F52 Pan-STARRS 2 ± 12–28 26.6 — 2023-09-25 2023-09-26K88 GINOP-KHK, Piszkesteto ± 1.3–2.8 31.6 — 2023-10-03 2023-10-05G96 Mt. Lemmon Survey ± 3.9–8.8 29.1 ? 2023-10-07 2023-10-06G96 Mt. Lemmon Survey ± 2.9–6.4 29.8 ? 2023-10-07 2023-10-05G96 Mt. Lemmon Survey ± 3.7–8.2 29.3 ? 2023-10-07 2023-10-09G96 Mt. Lemmon Survey ± 4.8–11 28.7 ? 2023-10-07 2023-10-09G96 Mt. Lemmon Survey ± 3.6–7.9 29.4 ? 2023-10-10 2023-10-11F51 Pan-STARRS 1 ± 3.2–7.0 29.6 ? 2023-10-10 2023-10-08703 Catalina Sky Survey ± 11–24 26.9 ? 2023-10-12 2023-10-07F51 Pan-STARRS 1 ± 7.5–17 27.8 ? 2023-10-12 2023-10-15F51 Pan-STARRS 1 ± 3.9–8.8 29.2 ? 2023-10-14 2023-10-11G96 Mt. Lemmon Survey ± 3.8–8.6 29.2 ? 2023-10-14 2023-10-15703 Catalina Sky Survey ± 3.1–6.9 29.7 ? 2023-10-14 2023-10-17V00 Kitt Peak-Bok ± 2.7–6.1 30.0 ? 2023-10-15 2023-10-16703 Catalina Sky Survey ± 2.6–5.8 30.1 ? 2023-10-18 2023-10-17F52 Pan-STARRS 2 ± 3.3–7.5 29.5 ? 2023-10-18 2023-10-20F51 Pan-STARRS 1 ± 1.8–4.1 30.8 ? 2023-10-20 2023-10-21F51 Pan-STARRS 1 ± 2.7–6.1 30.0 ? 2023-10-20 2023-10-14G96 Mt. Lemmon Survey ± 18–39 25.9 ? 2023-11-02 2023-11-01I52 Steward Observatory, Mt. Lemmon Station ± 5.1–11 28.6 ? 2023-11-02 2023-11-03703 Catalina Sky Survey ± 5.9–13 28.3 ? 2023-11-04 2023-11-04703 Catalina Sky Survey ± 2.4–5.4 30.2 ? 2023-11-04 2023-11-05703 Catalina Sky Survey ± 3.2–7.1 29.6 ? 2023-11-07 2023-11-03F52 Pan-STARRS 2 ± 2.9–6.4 29.8 ? 2023-11-07 2023-11-05N87 Nanshan Station, Xinjiang Observatory ± 6.0–13 28.2 ? 2023-11-07 2023-11-08G96 Mt. Lemmon Survey ± 3.4–7.5 29.5 ? 2023-11-07 2023-11-06G96 Mt. Lemmon Survey ± 2.6–5.7 30.1 ? 2023-11-08 2023-11-09M22 ATLAS South Africa ± 11–24 27.0 ? 2023-11-10 2023-11-08G96 Mt. Lemmon Survey ± 6.1–14 28.2 ? 2023-11-17 2023-11-16W68 ATLAS Chile, Rio Hurtado ± 5.3–12 28.5 ? 2023-11-19 2023-11-22703 Catalina Sky Survey ± 10–23 27.0 ? 2023-11-20 2023-11-21703 Catalina Sky Survey ± 4.3–9.7 28.9 ? 2023-11-30 2023-12-06703 Catalina Sky Survey ± 7.1–16 27.9 ? 2023-12-02 2023-12-03G96 Mt. Lemmon Survey ± 4.9–11 28.7 ? 2023-12-03 2023-12-05U74 – JPL SynTrack Robotic Telescope 2, Auberry ± 2.5–5.5 30.2 ? 2023-12-06 2023-12-04F51 Pan-STARRS 1 ± 7.9–18 27.6 ? 2023-12-08 2023-12-11W94 MAP, San Pedro de Atacama ± 14–31 26.4 ? 2023-12-08 2023-12-09T05 ATLAS-HKO, Haleakala ± 9.7–22 27.2 ? 2023-12-09 2023-12-10W94 MAP, San Pedro de Atacama ± 4.9–11 28.7 ? 2023-12-09 2023-12-03G96 Mt. Lemmon Survey ± 6.1–14 28.2 ? 2023-12-13 2023-12-15703 Catalina Sky Survey ± 2.0–4.6 30.6 ? 2023-12-23 2023-12-17G96 Mt. Lemmon Survey ± 6.7–15 28.0 ? 2023-12-23 2020-12-23 ± 30–67 24.7 ? 2023-12-31 2024-01-02F51 Pan-STARRS 1 ± 7.7–17 27.7 ?

Warning times by size

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 ≥ 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)

Notes

Beyond 1 LD

Below is an example list of near-Earth asteroids that nominally will pass more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2023. During 2022, over 1,000 asteroids passed within of Earth.