Asteroids which came closer to Earth than the Moon in 2013 by time of discovery Below is the list of asteroid close approaches to Earth in 2013. This was the year of the Chelyabinsk impact, in addition to the other NEO flybys

Timeline of known close approaches less than one lunar distance from Earth in 2013

A list of known Near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00257 AU) from Earth in 2013, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS).

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 2013.

This list and relevant databases do not consider impacts as close approaches, thus the list does not include any of the 24 objects that collided with Earth's atmosphere in 2013, none of which were discovered in advance, but were observed visually or recorded by sensors designed to detect detonation of nuclear devices. Of the 24 objects so detected, 5 had an impact energy greater than that of a 1 kiloton device including the 440 kiloton Chelyabinsk meteor, estimated at 20 m in diameter, which injured around 1500 people and damaged over 7000 buildings. NASA.gov

Date ofclosestapproach Datediscovered Object Nominal geocentricdistance (AU)Distance 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.Nominal geocentricdistance (LD)Size (m)(approximate)(H)(abs. mag.) Closerapproachto Moon Refs 2013-01-15 2013-01-20 7.3–16 27.8 Yes 2013-01-28 2013-02-01 2013 CY 6.1–14 28.2 2013-02-05 2013-02-06 6.4–14 28.1 2013-02-11 2013-02-14 5.6–12 28.4 Yes 2013-02-15 2012-02-23 367943 Duende 39–86 24.2 2013-03-04 2013-03-02 2013 EC 7.3–16 27.8 2013-03-09 2013-03-07 4.2–9.4 29.0 2013-04-18 2013-04-19 4.5–10 28.9 2013-06-08 2013-06-06 7.3–16 27.8 2013-08-04 2013-08-04 32–71 24.6 2013-08-09 2013-08-07 9.7–22 27.2 2013-09-03 2013-09-02 2013 RG 3.5–7.8 29.4 2013-09-04 2013-09-05 5.6–12 28.4 2013-09-05 2013-09-03 4.8-11 28.7 2013-09-18 2013-09-13 1.6–3.6 31.1 2013-10-04 2013-10-05 5.1–11 28.6 2013-10-09 2013-10-10 12–27 26.7 Yes 2013-10-21 2013-10-23 7–16 27.9 Yes 2013-10-25 2013-10-24 3.8–8.6 29.2 2013-10-29 2013-10-25 12–26 26.8 Yes 2013-11-08 2013-11-09 7–16 27.9 Yes 2013-11-29 2013-11-28 3.2–7.1 29.6 2013-12-11 2013-12-12 3.5–7.8 29.4 2013-12-23 2013-12-23 2013 YB 1.4–3.1 31.4

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 30 and greater (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

(probable size of the Chelyabinsk meteor)

Absolute magnitude 26 > H ≥ 25

None

Absolute magnitude 25 > H (largest)

Notes

Additional examples

An example list of near-Earth asteroids that passed more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2013. , December 18, 2013 (1.9 LD) , December 11, 2013 (2 LD) 3361 Orpheus, December 7, 2013 (40.1 LD) , November 18, 2013 (3 LD) , August 24, 2013 , August 8, 2013 , July 30, 2013 , July 26, 2013Astrowatch.net - June 2, 2013 , June 4, 2013 , May 29, 2013 , May 23, 2013 , March 20, 2013 , March 9, 2013

See also List of asteroid close approaches to Earth List of asteroid close approaches to Earth in 2012 List of asteroid close approaches to Earth in 2014

References

External links https://web.archive.org/web/20140307125729/http://neo.jpl.nasa.gov/ca/ Summary of current NEOCP objects / Comments on NEOCP objects (Project Pluto) Near-Earth object close approaches ±30 days within 5 LD