science

List of asteroid close approaches to Earth in 2015

List of asteroid close approaches to Earth in 2015 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 2015 rather than just read about it. In short: Below is the list of asteroid close approaches to Earth in 2015. Timeline of known close approaches less than one lunar distance from Earth in 2015 A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00257 AU) from Earth in 2015, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS).

Key takeaways

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Reference excerpt

Below is the list of asteroid close approaches to Earth in 2015.

Timeline of known close approaches less than one lunar distance from Earth in 2015 A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00257 AU) from Earth in 2015, 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 2015. This list and relevant databases do not consider impacts as close approaches, thus this list does not include any of the 43 objects that collided with Earth's atmosphere in 2015, none of which were discovered in advance, but were observed visually or recorded by sensors designed to detect detonation of nuclear devices. 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 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 None Absolute magnitude 25 > H (largest) None

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 2015.

2015 AK1 (~50 meters in diameter) passed 5.57 lunar distances from Earth on 18 January 2015. 2015 BC (~60 meters in diameter) passed 1.64 lunar distances from Earth (1.50 lunar distances from the Moon) on 20 January 2015. (357439) 2004 BL86 (~700 meters in diameter) passed 3.1 lunar distances (1.2 million km) from Earth on 26 January 2015. 2015 AZ43 (~70 meters in diameter) passed 0.0197 AU (2,950,000 km; 1,830,000 mi) from Earth on 15 February 2015. 2014 YB35 (~500 meters in diameter) passed 11.7 lunar distances (4 million km) from Earth on 2015 Mar 27. 2015 FW117 (~110 meters in diameter) passed 3.6 lunar distances (1.38 million km) (3.2 lunar distances from the Moon) (1.21 million km) on 1 April 2015. 2015 HM10 (~80 meters in diameter) passed 1.15 lunar distances (440,000 km) (1.08 lunar distances from the Moon) (410,000 km) on 7 July 2015. 2015 TQ21 (~15 meters in diameter) passed 1.005 lunar distances (390,000 km) on 7 October 2015 2014 UR (~20 meters in diameter) passed 3.81 lunar distances (1.46 million km) from Earth on 18 October 2015. 2015 TB145 (~600 meters in diameter) passed 1.3 lunar distances (480,000 km) (0.74 lunar distances from the Moon) (286,000 km) on 31 October 2015. 2015 VO142 (~6 meters in diameter) passed 1.02 lunar distances (393,000 km) (0.85 lunar distances from the Moon) (327,000 km) on 24 November 2015 Risk-listed asteroid 2007 VE191 (~60 meters in diameter) was not observed when it probably passed roughly 0.5 AU (75,000,000 km; 46,000,000 mi) from Earth on 27 November 2015. 2015 YB initially calculated to make a close approach to Earth on 19 December 2015 turned out to be a much further away inner main-belt asteroid. On 31 December 2015 the asteroid received the designation 2015 YU9.

Timeline of close approaches less than one Lunar distance from the Moon in 2015 The number of asteroids listed here are significantly less than those of asteroids approaching Earth for several reasons:

Asteroids approaching Earth not only move faster, but are brighter and are easier to detect with modern surveys due to these factors Asteroids approaching closer to Earth are higher priority to confirm, and only confirmed asteroids are listed with a lunocentric approach distance Those which make close approaches to the Moon are frequently lost in its glare, making them harder to confirm, and are more easily discovered during the new Moon, when the Moon is too close to the Sun for any asteroids to be detected while they are near to the Moon anyway. These factors combined severely limit the amount of Moon-approaching asteroids, to a level many times lower than the detected asteroids to pass just as close to Earth instead.

Notes

See also List of asteroid close approaches to Earth List of asteroid close approaches to Earth in 2014 List of asteroid close approaches to Earth in 2016

References

External links PIA19647: Asteroid 1999 JD6 (Radar imaged July 25, 2015)

Illustrations

Worked examples

Example 1 — a first encounter with List of asteroid close approaches to Earth in 2015

Start with the simplest possible case. Write down what List of asteroid close approaches to Earth in 2015 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to List of asteroid close approaches to Earth in 2015 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about List of asteroid close approaches to Earth in 2015 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 2015

In research: List of asteroid close approaches to Earth in 2015 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.
In technology and industry: Engineering practice reuses List of asteroid close approaches to Earth in 2015 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: List of asteroid close approaches to Earth in 2015 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 2015, so understanding it makes those chapters shorter.
In everyday life: Look for List of asteroid close approaches to Earth in 2015 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 2015 in simple terms?

Below is the list of asteroid close approaches to Earth in 2015. Timeline of known close approaches less than one lunar distance from Earth in 2015 A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00257 AU) from Earth in 2015, based on the close appro…

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