science

List of asteroid close approaches to Earth in 2013

List of asteroid close approaches to Earth in 2013 is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand List of asteroid close approaches to Earth in 2013 rather than just read about it. In short: 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-Ear…

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Reference excerpt

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. 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)

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.

2013 XH22, December 18, 2013 (1.9 LD) 2013 XY8, December 11, 2013 (2 LD) 3361 Orpheus, December 7, 2013 (40.1 LD) 2001 AV43, November 18, 2013 (3 LD) (52760) 1998 ML14, August 24, 2013 (277475) 2005 WK4, August 8, 2013 2003 DZ15, July 30, 2013 2006 BL8, July 26, 2013 2009 FE, June 4, 2013 (285263) 1998 QE2, May 29, 2013 (163364) 2002 OD20, May 23, 2013 (7888) 1993 UC, March 20, 2013 2013 ET, 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

Illustrations

Worked examples

Example 1 — a first encounter with List of asteroid close approaches to Earth in 2013

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Example 2 — changing one variable

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Example 3 — an exam-style question

Typical questions about List of asteroid close approaches to Earth in 2013 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of List of asteroid close approaches to Earth in 2013

In research: List of asteroid close approaches to Earth in 2013 appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
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In the classroom: List of asteroid close approaches to Earth in 2013 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lists of asteroids, Near-Earth asteroids, Near-Earth objects in 2013, so understanding it makes those chapters shorter.
In everyday life: Look for List of asteroid close approaches to Earth in 2013 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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Frequently asked questions

What is List of asteroid close approaches to Earth in 2013 in simple terms?

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…

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Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

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